Author: "J. Scheins" - Searchworks@Jio Institute Digital Library Search Results

Your search keyword '"J. Scheins"' showing total 62 results

Start Over Author "J. Scheins"

62 results on '"J. Scheins"'

1. Multimodal Fingerprints of Resting State Networks as assessed by Simultaneous Trimodal MR-PET-EEG Imaging

Author: N. J. Shah, J. Arrubla, R. Rajkumar, E. Farrher, J. Mauler, E. Rota Kops, L. Tellmann, J. Scheins, F. Boers, J. Dammers, P. Sripad, C. Lerche, K. J. Langen, H. Herzog, and I. Neuner
Subjects: Medicine, Science
Abstract: Abstract Simultaneous MR-PET-EEG (magnetic resonance imaging - positron emission tomography – electroencephalography), a new tool for the investigation of neuronal networks in the human brain, is presented here for the first time. It enables the assessment of molecular metabolic information with high spatial and temporal resolution in a given brain simultaneously. Here, we characterize the brain’s default mode network (DMN) in healthy male subjects using multimodal fingerprinting by quantifying energy metabolism via 2- [18F]fluoro-2-desoxy-D-glucose PET (FDG-PET), the inhibition – excitation balance of neuronal activation via magnetic resonance spectroscopy (MRS), its functional connectivity via fMRI and its electrophysiological signature via EEG. The trimodal approach reveals a complementary fingerprint. Neuronal activation within the DMN as assessed with fMRI is positively correlated with the mean standard uptake value of FDG. Electrical source localization of EEG signals shows a significant difference between the dorsal DMN and sensorimotor network in the frequency range of δ, θ, α and β–1, but not with β–2 and β–3. In addition to basic neuroscience questions addressing neurovascular-metabolic coupling, this new methodology lays the foundation for individual physiological and pathological fingerprints for a wide research field addressing healthy aging, gender effects, plasticity and different psychiatric and neurological diseases.
Published: 2017
Full Text: View/download PDF

2. Search for light gravitinos in events with photons and missing transverse momentum at HERA

Author: V. Yeganov, D. Kant, P. E. Reimer, F. Moreau, G. G. Winter, Laurent Schoeffel, Dusan Bruncko, J. Wagner, Katerina Lipka, B. Naroska, J. Kroseberg, V. Lubimov, Pierre Marage, Murrough Landon, J. Böhme, T. Kluge, V. Tchoulakov, S. Gorbounov, I. R. Kenyon, Karel Cerny, H. U. Martyn, F. Zomer, A. Uraev, V. Andreev, H. Spitzer, Yves Sirois, T. Greenshaw, Erika Garutti, G. Franke, K. Nankov, L. N. Shtarkov, J. Ferencei, M. Martisikova, J. Naumann, I. Foresti, G. Cozzika, Georgios Tsipolitis, M. Fleischer, P. Van Mechelen, R. Weber, J. Marks, Claus Kleinwort, R. D. Heuer, Klaus Desch, Stefan Valkar, B. Olivier, Roland Horisberger, A. Valkárová, H.-B. Bröker, Hannes Jung, D.P. Brown, J. Haller, O. Henshaw, V. Jemanov, Paul Laycock, E. Malinovski, T. Laštovička, A. D.R. Vargas Trevino, A. Dubak, A. Rimmer, C. Wissing, Alexander Zhokin, S. Baumgartner, C. Niebuhr, J. Becker, Adrian Perieanu, C. Vallée, A. Lebedev, O. Behnke, Emmanuel Sauvan, A. Knutsson, S. Levonian, E. Barrelet, Z. Rurikova, Bogdan Povh, F. Sefkow, G. Grindhammer, J. Dingfelder, I. Sheviakov, S. Schmitt, Y. Vazdik, Daniel Pitzl, S. Egli, Y. R. Coppens, P. Baranov, D. Traynor, K. Daum, A. Asmone, K. H. Hiller, R. C. W. Henderson, N. Werner, F. Cassol-Brunner, E. A. De Wolf, Ch. Berger, C. Risler, R. Roosen, E. Perez, D. Haidt, David South, F. Tomasz, G. Knies, L. Hajduk, A. Aktas, Anton Babaev, J. G. Contreras, M. Urban, M. Jacquet, A. Mohamed, G. Weber, U. Straumann, I. Herynek, Thorsten Lux, L. Janauschek, N. Van Remortel, A. Nikiforov, V. Korbel, P.D. Thompson, M. Schneider, Stefania Xella, G. Thompson, Y. Soloviev, Leif J. Jönsson, Benoit Roland, T. Klimkovich, M. Peez, V. Volchinski, J. Zálešák, V. Spaskov, J. Kückens, K. Wacker, Peter Schleper, T. J. Sloan, P.J.W. Faulkner, A.S. Belousov, Sergey Rusakov, Martin Karlsson, C. Pascaud, P. Truöl, Paul Richard Newman, Guenter Eckerlin, A. Specka, H. Meyer, R. Demirchyan, C. Gwilliam, R. Pöschl, L. Bystritskaya, Eram Rizvi, H. Henschel, F. P. Schilling, Grzegorz Nowak, I. Milcewicz-Mika, Rainer Stamen, R. Koutouev, A. Petrukhin, Xavier Janssen, R. Marshall, J.C. Bizot, Th. Naumann, H. Zohrabyan, G. Heinzelmann, R. Plačakytė, W. Yan, K. Meier, Gero Flucke, M. Kapichine, M. Nozicka, K. Rybicki, A. Vest, O. Behrendt, V. Dodonov, N. Loktionova, V. Chekelian, S. Vinokurova, Pavel Murin, H. Grässler, J. Cvach, I. Strauch, M. Ibbotson, V. Nagovizin, J-P. Meyer, Judith Katzy, A. Makankine, N. Keller, G. Buschhorn, A. Hovhannisyan, J. Scheins, R. Lemrani, B. Delcourt, E. Gabathuler, Philipp Fleischmann, Laurent Favart, Christoph Grab, C. Werner, Y.H. Fleming, V. Lendermann, V. Schröder, L. Lytkin, T. Anthonis, D. Ozerov, I. Tsurin, B. Portheault, P. Kostka, Peter Robmann, Cristinel Diaconu, V. Brisson, J. Garvey, E. E. Elsen, J. Turnau, W.D. Dau, J. B. Dainton, S. Schätzel, A. Schöning, D. Lüke, C. Duprel, P. Höting, E. Wünsch, A. M. Fomenko, B. Leißner, A. Rostovtsev, Dave Sankey, M. Beckingham, Matthias Ulrich Mozer, A. Fedotov, D. Utkin, B. Reisert, G. D. Patel, C. Gerlich, Günter Flügge, M.-O. Boenig, J. Bähr, Wolfram Erdmann, B. List, S. Backovic, Max Klein, S. Ginzburgskaya, C. Kiesling, D.P. Johnson, A. De Roeck, E. Tzamariudaki, A. J. Campbell, H. Lueders, Stephen Maxfield, N. Malden, S. Mangano, M. Ismail, David Milstead, P. A. Smirnov, Wolfgang Lange, J. Stiewe, J. V. Morris, C. Veelken, S. Schmidt, A. Bunyatyan, J. Gayler, Andrew Mehta, J. Bracinik, N. Gogitidze, Nicolas Berger, Ewelina Lobodzinska, M. Wessels, S. Ghazaryan, M. Ellerbrock, G. Herrera, Bradley Cox, R. Wolf, B. Wessling, Anna Kropivnitskaya, Alexander Paramonov, R. Felst, A. Zhelezov, K. Müller, Christian Schwanenberger, John A Coughlan, S. Caron, Magnus Hansson, D.K. Nikitin, L. Goerlich, B. Stella, K. Gabathuler, D. Wegener, V. Efremenko, B. Koblitz, S. Mikocki, J. Formánek, R. Gerhards, K. Krüger, J. Žáček, Hans-Christian Schultz-Coulon, R. Eichler, E.-E. Woehrling, F. Eisele, R. Oganezov, K. Sedlák, J. E. Olsson, W. Bartel, Malte Hildebrandt, F. W. Büsser, T. Berndt, Natasa Raicevic, Vincent Boudry, A. N. Morozov, M. Gregori, Zhen Zhang, Ricardo Lopez-Fernandez, D. Hoffmann, Andreas Meyer, D. Meer, A. Usik, G. Frising, L. Lindfeld, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), and H1 Collaboration
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Yukawa potential, FOS: Physical sciences, HERA, 01 natural sciences, Lightest Supersymmetric Particle, Supersymmetry breaking, High Energy Physics - Experiment, Standard Model, Nuclear physics, High Energy Physics - Experiment (hep-ex), Selectron tube, 0103 physical sciences, Neutralino, Physique des particules élémentaires, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Gravitino, 010306 general physics
Abstract: A search for gravitinos produced in e±p collisions is performed using the H1 detector at HERA. The data were taken at a centre-of-mass energy of 319 GeV and correspond to an integrated luminosity of 64.3 pb -1 for e+p collisions and 13.5 pb-1 for e -p collisions. If R-parity is not conserved, the t-channel exchange of a selectron can produce a neutralino, which, in models where the gravitino is the lightest supersymmetric particle, subsequently decays into a photon and a light gravitino. The resulting event signature, which involves an isolated photon, a jet and missing transverse energy, is analysed for the first time at HERA. No deviation from the Standard Model is found. Exclusion limits on the cross section and on R-parity-violating Yukawa couplings are derived in a Gauge Mediated Supersymmetry Breaking scenario. The results are independent of the squark sector. Neutralinos and supersymmetric partners of the left-handed electron with masses up to 112 GeV and 164 GeV, respectively, can be ruled out at the 95% confidence level for R-parity-violating couplings λ′ equal to 1, in some parts of the parameter space of the considered model. © 2005 Elsevier B.V. All rights reserved., 0, DESY-04-227 / hep-ex/0501030, SCOPUS: ar.j, H1 Collaboration., info:eu-repo/semantics/published
Published: 2005

3. Measurement of $F_2^{c\bar{c}}$ and $F_2^{b\bar{b}}$ at high Q 2 using the H1 vertex detector at HERA

Author: G. G. Winter, G. Thompson, A. Nikiforov, Denis Johnson, K. H. Hiller, R. C. W. Henderson, S. Levonian, Jochen Dingfelder, Y.R. Coppens, T. Frisson, I. Strauch, Philipp Fleischmann, A. Baghdasaryan, A. Rostovtsev, Leif J. Jönsson, Carl Gwilliam, Yves Sirois, O. Behrendt, S. Vinokurova, R. Lemrani, P. Kostka, A. Specka, T. Klimkovich, Dirk L. Hoffmann, David South, J-P. Meyer, G. Franke, B. Vujicic, R. Oganezov, D. Utkin, J. Bähr, A. Makankine, G. Buschhorn, Matthias Ulrich Mozer, J. Turnau, Michael Schneider, A. Fedotov, Günter Flügge, J. Zalesak, R. Roosen, Wolfgang Lange, C. Niebuhr, Grzegorz Nowak, D. Ozerov, R. Weber, S. Ginzburgskaya, J. Gayler, R. Koutouev, A. Petrukhin, V. Andreev, M. Hildebrandt, Johannes Haller, Y. Soloviev, L. Lindfeld, J. E. Olsson, W. Bartel, A. D.R. Vargas Trevino, H. U. Martyn, Matthias Klein, C. Kiesling, E. E. Elsen, Ahmed Tarek Abouelfadl Mohamed, V. Lubimov, A. De Roeck, E. Tzamariudaki, A. J. Campbell, C. Wigmore, F. P. Schilling, M.-O. Boenig, John A Coughlan, B. Portheault, F. W. Büsser, K. Sedlak, Magnus Hansson, V. Jemanov, Peter Robmann, S. Mangano, Christoph Grab, E. Malinovski, Emmanuel Sauvan, K. Nankov, Roland Horisberger, V. Lendermann, A. Valkárová, V. Schröder, G. Grindhammer, Nicolas Berger, L. N. Shtarkov, I. R. Kenyon, T. Berndt, E. Perez, N. Werner, Michael R. Wessels, Natasa Raicevic, L. Goerlich, P. D. Thompson, V. Brisson, B. Leissner, S. Backovic, Vincent Boudry, D. P. C. Sankey, J. Zimmermann, R. Gerhards, A. Zhelezov, S. Baudrand, B. Stella, Adrian Perieanu, N. Keller, Martin Karlsson, Paul Newman, Zuzana Rurikova, Stefan Schmitt, A. N. Morozov, V. Yeganov, Paul Laycock, H. Lueders, D. Perez-Astudillo, M. Gregori, A. Dubak, R. Eichler, Georgios Tsipolitis, M. Fleischer, Ewelina Lobodzinska, Gerhard Brandt, Matthew Beckingham, M. Goettlich, T. Laštovička, F. Moreau, S. J. Aplin, V. Volchinski, H. Meyer, Y. Vazdik, R. Demirchyan, D. Lüke, Anna Kropivnitskaya, A. Aktas, E. Barrelet, B. Olivier, V. Chekelian, R. Felst, Xavier Janssen, J. Formánek, L. Bystritskaya, M. Peez, Stefania Xella, David Milstead, Zhen Zhang, D. Meer, E. A. De Wolf, Ch. Berger, Karlheinz Meier, H. Zohrabyan, D.P. Brown, S. Essenov, Ricardo Lopez-Fernandez, S. Baumgartner, Bogdan Povh, F. Sefkow, P. Höting, M. Jacquet, Th. Naumann, K. Gabathuler, D. Wegener, A. Usik, G. Frising, A. Rimmer, I. Herynek, D. Kant, Benno List, Katerina Lipka, E. Gabathuler, A. Knutsson, J. Garvey, Katja Krüger, Amanda R. Vest, Laurent Schoeffel, Judith Katzy, V. Tchoulakov, A. M. Fomenko, V. Efremenko, Y.H. Fleming, S. Mikocki, Sebastian M. Schmidt, C. Gerlich, C. Goyon, H-C. Schultz-Coulon, R. Pöschl, M. Urban, R. Marshall, T. Kluge, Pavel Murin, H. Grässler, Guenter Eckerlin, André Schöning, I. Milcewicz-Mika, M. Ibbotson, C. Duprel, Laurent Favart, W. Yan, J. Cvach, Ringaile Placakyte, N. Loktionova, A. Hovhannisyan, D. Traynor, C. Risler, G. Weber, U. Straumann, Anton Babaev, J. G. Contreras, I. Tsurin, P. Prideaux, P. Baranov, T. J. Sloan, P.J.W. Faulkner, A.S. Belousov, Sergey Rusakov, M. Ismail, P. Truöl, P. A. Smirnov, J. Wagner, B. Wessling, Juraj Bracinik, D.K. Nikitin, O. Henshaw, C. Wissing, J. Böhme, Murrough Landon, Karel Cerny, Thorsten Lux, L. Janauschek, N. Van Remortel, A. Uraev, S. Gorbounov, J. Zacek, A. Glazov, J. Scheins, K. Müller, Christian Schwanenberger, V. Korbel, Stephen Maxfield, J. Stiewe, Wolfram Erdmann, Andrew Mehta, P. Van Mechelen, N. Gogitidze, W.D. Dau, J. B. Dainton, R. D. Heuer, L. Finke, M. Ellerbrock, G. Herrera, Alexandre Lebedev, Bradley Cox, C. Werner, K. Daum, F. Tomasz, C. Pascaud, G. Knies, S. Egli, S. Ghazaryan, F. Salvaire, D. Haidt, Eram Rizvi, G. Heinzelmann, V. Dodonov, Sascha Caron, E. Wünsch, G. D. Patel, K. Wacker, N. Malden, J. V. Morris, A. Bunyatyan, Dusan Bruncko, B. Naroska, Klaus Kurt Desch, H. Henschel, J.C. Bizot, T. Greenshaw, Erika Garutti, Fabian Zomer, I. Foresti, G. Cozzika, Stefan Valkar, C. Schmitz, H.-B. Bröker, Hannes Jung, Alexander Zhokin, J. Becker, C. Vallée, J. Ferencei, M. Martisikova, J. Naumann, Gero Flucke, M. Kapichine, M. Nozicka, J. Marks, B. Delcourt, Roger Wolf, T. Anthonis, Claus Kleinwort, S. Schätzel, I. Sheviakov, V. Spaskov, J. Kückens, A. B. Meyer, B. Roland, V. Nagovizin, E. E. Woehrling, Pierre Marage, I. Glushkov, Christian Veelken, O. Behnke, F. Eisele, Daniel Pitzl, A. Asmone, F. Cassol-Brunner, L. Hajduk, L. Lytkin, Cristinel Diaconu, and P. E. Reimer
Subjects: Quantum chromodynamics, Physics, Particle physics, Photon, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Structure function, HERA, 01 natural sciences, Transverse plane, 0103 physical sciences, High Energy Physics::Experiment, Vertex detector, Impact parameter, Nuclear Experiment, 010306 general physics, Engineering (miscellaneous)
Abstract: Measurements are presented of inclusive charm and beauty cross sections in e$^+$p collisions at HERA for values of photon virtuality Q$^2$ > 150 GeV$^2$ and of inelasticity 0.1 < y < 0.7. The charm and beauty fractions are determined using a method based on the impact parameter, in the transverse plane, of tracks to the primary vertex, as measured by the H1 vertex detector. The data are divided into four regions in Q$^2$ and Bjorken x, and values for the structure functions $F_2^{c\overline{c}}$ and $F_2^{b\overline{b}}$ are obtained. The results are found to be compatible with the predictions of perturbative quantum chromodynamics.
Published: 2005

4. Search for bosonic stop decays in R-parity violating supersymmetry in e+p collisions at HERA

Author: J. Wagner, J. Böhme, Karel Cerny, A. Uraev, M. Beckingham, Stephen Maxfield, J. Stiewe, Matthias Ulrich Mozer, Wolfgang Lange, Pierre Marage, A. Fedotov, Günter Flügge, V. Lubimov, S. Ginzburgskaya, J. Gayler, A. Lebedev, R. Plačakytė, C. Kiesling, A. De Roeck, E. Tzamariudaki, A. J. Campbell, C. Veelken, Andrew Mehta, J. Bracinik, K. Nankov, L. N. Shtarkov, V. Korbel, N. Gogitidze, D. Haidt, T. Laštovička, Laurent Schoeffel, R. Weber, G. Ossoskov, P. E. Reimer, E. Barrelet, N. Keller, Paul Laycock, E. Malinovski, A. Vest, G. Weber, U. Straumann, C. Werner, Z. Rurikova, Murrough Landon, O. Behnke, Emmanuel Sauvan, O. Behrendt, G. Grindhammer, E. A. De Wolf, Ch. Berger, Peter Robmann, T. J. Sloan, S. Vinokurova, V. Lendermann, J. Dingfelder, S. Gorbounov, R. Lemrani, P. Kostka, Eram Rizvi, B. Portheault, K. H. Hiller, R. C. W. Henderson, G. G. Winter, N. Werner, V. Schröder, M.-O. Boenig, T. Kuhr, Dusan Bruncko, J. Turnau, G. Heinzelmann, B. Naroska, I. Herynek, S. Levonian, R. Roosen, E. E. Elsen, V. Dodonov, P. Van Mechelen, T. Kluge, O. Henshaw, Paul Richard Newman, Grzegorz Nowak, A. Dubak, T. Greenshaw, Erika Garutti, A. Rostovtsev, V. Jemanov, S. Backovic, R. D. Heuer, R. Koutouev, A. Petrukhin, H. Lueders, S. Mangano, Y. Vazdik, M. Wessels, L. Lytkin, P.D. Thompson, M. Ellerbrock, M. Schneider, Cristinel Diaconu, Stefania Xella, J. Ferencei, G. Herrera, I. Morozov, M. Martisikova, J. Naumann, David South, Bradley Cox, J. Marks, I. R. Kenyon, R. Wolf, Alexander Paramonov, L. Bystritskaya, Y. R. Coppens, C. Pascaud, B. Stella, H. Spitzer, K. Daum, F. Tomasz, K. Krüger, Claus Kleinwort, Nicolas Berger, Th. Naumann, Gero Flucke, J. Kennedy, V. Brisson, G. Knies, M. Kapichine, M. Nozicka, H. Zohrabyan, B. Wessling, C. Risler, Guenter Eckerlin, I. Sheviakov, S. Schmitt, A. Nikiforov, E. Gabathuler, D. Lüke, Roland Horisberger, A. Valkárová, Daniel Pitzl, D. Traynor, A. Asmone, A. Schöning, M. Jacquet, E. Wünsch, Rainer Stamen, A. Specka, J. Zálešák, B. Delcourt, V. Spaskov, S. Baumgartner, I. Strauch, Philipp Fleischmann, Dave Sankey, D. Utkin, F. Cassol-Brunner, L. Hajduk, J. Kückens, K. Wacker, Martin Erdmann, M. Urban, J. Kroseberg, Anton Babaev, C. Gwilliam, S. Schätzel, S. Caron, A. Zhelezov, B. Roland, K. Müller, R. Pöschl, I. Milcewicz-Mika, Leif J. Jönsson, Christian Schwanenberger, B. Reisert, J. Bähr, P. Baranov, G. D. Patel, Adrian Perieanu, J. G. Contreras, A. Aktas, Martin Karlsson, R. Marshall, C. Niebuhr, Peter Schleper, T. Klimkovich, V. Chekelian, M. Peez, A. Mohamed, V. Nagovizin, H. U. Martyn, Georgios Tsipolitis, K. Meier, M. Fleischer, B. Olivier, N. Malden, J. Cvach, G. Thompson, S. Egli, P.J.W. Faulkner, A.S. Belousov, Sergey Rusakov, P. Truöl, Y. Soloviev, Max Klein, A. Makankine, G. Buschhorn, P. Höting, D. Ozerov, D.P. Brown, J. Haller, Pavel Murin, H. Grässler, W. Yan, J. V. Morris, D. Kant, Judith Katzy, Y.H. Fleming, H. Henschel, A. Bunyatyan, M. Ibbotson, N. Loktionova, V. Yeganov, Bogdan Povh, F. Sefkow, J.C. Bizot, A. Hovhannisyan, D.K. Nikitin, V. Volchinski, F. P. Schilling, Katerina Lipka, C. Duprel, I. Tsurin, I. Foresti, G. Cozzika, M. Ismail, David Milstead, V. Tchoulakov, P. A. Smirnov, C. Wissing, H. Meyer, R. Demirchyan, Stefan Valkar, J. Garvey, K. Rybicki, Laurent Favart, T. Anthonis, F. Moreau, H.-B. Bröker, Hannes Jung, Alexander Zhokin, J. Becker, C. Vallée, Xavier Janssen, A. M. Fomenko, C. Gerlich, Christoph Grab, A. D.R. Vargas Trevino, J. Scheins, Klaus Desch, Thorsten Lux, L. Janauschek, N. Van Remortel, A. Rimmer, W.D. Dau, J. B. Dainton, A. Knutsson, B. Leißner, E. Perez, R. Gerhards, J. Formánek, Wolfram Erdmann, B. List, K. Gabathuler, D. Wegener, S. Ghazaryan, V. Efremenko, B. Koblitz, S. Mikocki, S. Schmidt, John A Coughlan, F. Zomer, V. Andreev, Magnus Hansson, Yves Sirois, G. Franke, Daniel Johnson, L. Goerlich, F. Eisele, R. Oganezov, K. Sedlák, Ewelina Lobodzinska, Anna Kropivnitskaya, R. Felst, J. Žáček, Hans-Christian Schultz-Coulon, R. Eichler, E.-E. Woehrling, L. Lindfeld, J. E. Olsson, W. Bartel, Malte Hildebrandt, F. W. Büsser, T. Berndt, Natasa Raicevic, Vincent Boudry, A. N. Morozov, M. Gregori, Zhen Zhang, Ricardo Lopez-Fernandez, J-P. Meyer, D. Hoffmann, Andreas Meyer, D. Meer, A. Usik, and G. Frising
Subjects: Quark, Physics, Nuclear and High Energy Physics, Particle physics, High Energy Physics::Phenomenology, Hadron, Scalar (mathematics), Yukawa potential, Supersymmetry, HERA, Nuclear physics, R-parity, High Energy Physics::Experiment, Minimal Supersymmetric Standard Model
Abstract: A search for scalar top quarks in R-parity violating supersymmetry is performed in e(+)p collisions at HERA using the H1 detector. The data, taken at roots = 319 GeV and 301 GeV, correspond to an integrated luminosity of 106 pb(-1). The resonant production of scalar top quarks t in positron quark fusion via an R-parity violating Yukawa coupling lambda' is considered with the subsequent bosonic stop decay t --> BW. The R-parity violating decay of the sbottom quark b --> dv(e) and leptonic and hadronic W decays are considered. No evidence for stop production is found in the search for bosonic stop decays nor in a search for the direct R-parity violating decay t --> eq. Mass dependent limits on lambda' are obtained in the framework of the minimal supersymmetric Standard Model. Stop quarks with masses up to 275 GeV can be excluded at the 95% confidence level for a Yukawa coupling of electromagnetic strength. (C) 2004 Elsevier B.V. All rights reserved.
Published: 2004

5. Measurement of the proton structure function F2 at low Q2 in QED Compton scattering at HERA

Author: W. Yan, N. Loktionova, A. D.R. Vargas Trevino, Paul Richard Newman, Grzegorz Nowak, A. Hovhannisyan, R. Koutouev, A. Petrukhin, Laurent Schoeffel, J. Žáček, I. R. Kenyon, R. Plačakytė, I. Foresti, G. Cozzika, I. Sheviakov, S. Schmitt, M. Jacquet, I. Tsurin, H. Spitzer, Pierre Marage, S. Levonian, E. Perez, P. Höting, Hans-Christian Schultz-Coulon, Murrough Landon, Stefan Valkar, S. Schmidt, Z. Ratiani, Ewelina Lobodzinska, C. Wissing, N. Keller, K. Gabathuler, I. Milcewicz-Mika, H.-B. Bröker, Hannes Jung, R. Gerhards, V. Lendermann, V. Schröder, S. Gorbounov, Anna Kropivnitskaya, R. Felst, D. Wegener, V. Korbel, R. Eichler, J. Kennedy, V. Brisson, C. Niebuhr, Alexander Zhokin, J. Becker, Caroline Collard, J. Zálešák, S. Egli, J. V. Morris, V. Spaskov, Adrian Perieanu, C. Vallée, R. Heremans, E.-E. Woehrling, H. U. Martyn, B. Portheault, Matthias Klein, Y. Soloviev, O. Behnke, P. E. Reimer, David South, Magnus Hansson, J. Kückens, K. Wacker, A. Bunyatyan, L. Goerlich, E. E. Elsen, S. Baumgartner, V. Volchinski, Th. Naumann, P. Van Mechelen, Pavel Murin, H. Grässler, Daniel Pitzl, V. Lubimov, V. Efremenko, D. Traynor, B. Koblitz, M. Ibbotson, F. P. Schilling, Thorsten Lux, L. Janauschek, H. Meyer, R. Demirchyan, T. Laštovička, N. Van Remortel, R. D. Heuer, A. Asmone, Xavier Janssen, I. Morozov, J. Garvey, F. Cassol-Brunner, L. Hajduk, C. Werner, J. Scheins, G. G. Winter, D. Lüke, E. Barrelet, Leif J. Jönsson, Benoit Roland, F. Eisele, Z. Rurikova, E. Gabathuler, L. Bystritskaya, S. Mikocki, G. Thompson, E. Wünsch, D.P. Brown, M. Urban, J. Haller, H. Zohrabyan, R. Oganezov, A. M. Fomenko, V. Chekelian, K. Sedlák, Dave Sankey, T. Klimkovich, W.D. Dau, J. B. Dainton, K. Rybicki, A. Schöning, Judith Katzy, E. A. De Wolf, Ch. Berger, John A Coughlan, C. Gerlich, Karlheinz Meier, R. Roosen, M.-O. Boenig, A. Makankine, Laurent Favart, L. N. Shtarkov, Christoph Grab, J. Wagner, V. Nagovizin, K. Daum, G. Buschhorn, B. Leißner, M. Peez, Y.H. Fleming, T. Anthonis, F. Tomasz, B. Stella, G. D. Patel, J. Kroseberg, S. Mangano, D.P. Johnson, D. Ozerov, J. Böhme, H. Henschel, J.C. Bizot, Karel Cerny, C. Duprel, G. Knies, A. Uraev, N. Malden, F. Zomer, M. Beckingham, R. Weber, Nicolas Berger, Matthias Ulrich Mozer, A. Lebedev, Gero Flucke, V. Andreev, C. Risler, A. Fedotov, Günter Flügge, D. Haidt, L. Lytkin, Cristinel Diaconu, Georgios Tsipolitis, M. Fleischer, M. Kapichine, M. Nozicka, I. Herynek, C. Kiesling, Dusan Bruncko, Eram Rizvi, G. Heinzelmann, A. De Roeck, V. Dodonov, Martin Erdmann, E. Tzamariudaki, A. J. Campbell, S. Michine, J. Formánek, C. Gwilliam, A. Rostovtsev, B. Naroska, J-P. Meyer, B. Delcourt, Yves Sirois, J. Cvach, Bogdan Povh, F. Sefkow, G. Ossoskov, Rainer Stamen, T. Kluge, T. Greenshaw, Erika Garutti, M. Ismail, David Milstead, P. A. Smirnov, P. Baranov, G. Franke, Wolfram Erdmann, B. List, Peter Schleper, S. Schätzel, J. Ferencei, M. Martisikova, J. Naumann, C. Pascaud, J. Marks, Guenter Eckerlin, A. Nikiforov, A. Dubak, T. J. Sloan, P.J.W. Faulkner, A.S. Belousov, Claus Kleinwort, Sergey Rusakov, P. Truöl, D. Utkin, B. Reisert, J. Bähr, S. Ghazaryan, Y. Vazdik, P.D. Thompson, M. Schneider, S. Caron, Stefania Xella, D.K. Nikitin, B. Wessling, R. Pöschl, O. Henshaw, R. Marshall, K. Müller, Christian Schwanenberger, Stephen Maxfield, M. Hildebrandt, J. Stiewe, Andrew Mehta, J. Bracinik, N. Gogitidze, Anton Babaev, J. G. Contreras, A. Mohamed, M. Wessels, M. Ellerbrock, G. Herrera, Bradley Cox, R. Wolf, Klaus Desch, A. Rimmer, A. Knutsson, Zhen Zhang, Ricardo Lopez-Fernandez, D. Hoffmann, Andreas Meyer, D. Meer, A. Usik, G. Frising, J. E. Olsson, W. Bartel, F. W. Büsser, T. Berndt, Natasa Raicevic, Vincent Boudry, A. N. Morozov, M. Gregori, L. Lindfeld, G. Weber, U. Straumann, V. Jemanov, V. Yeganov, A. Aktas, Y. R. Coppens, F. Moreau, B. Olivier, D. Kant, Katerina Lipka, K. H. Hiller, R. C. W. Henderson, V. Tchoulakov, I. Strauch, Philipp Fleischmann, A. Vest, O. Behrendt, S. Vinokurova, Peter Robmann, R. Lemrani, P. Kostka, J. Turnau, A. Specka, S. Backovic, H. Lueders, Wolfgang Lange, J. Gayler, C. Veelken, Paul Laycock, E. Malinovski, Emmanuel Sauvan, G. Grindhammer, J. Dingfelder, N. Werner, T. Kuhr, Roland Horisberger, A. Valkárová, and Martin Karlsson
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Photon, Proton, 010308 nuclear & particles physics, Scattering, High Energy Physics::Phenomenology, Detector, Structure function, Compton scattering, HERA, 01 natural sciences, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics
Abstract: The proton structure function F-2(x, Q(2)) is measured in inelastic QED Compton scattering using data collected with the H1 detector at HERA. QED Compton events are used to access the kinematic range of very low virtualities of the exchanged photon, Q(2), down to 0.5 GeV2, and Bjorken x up to similar to 0.06, a region which has not been covered previously by inclusive measurements at HERA. The results are in agreement with the measurements from fixed target lepton-nucleon scattering experiments. (C) 2004 Published by Elsevier B.V.
Published: 2004

6. Forward $\pi^\circ$ production and associated transverse energy flow in deep-inelastic scattering at HERA

Author: V. Nagovizin, Leif J. Jönsson, A. Makankine, G. Buschhorn, D. Ozerov, E. E. Woehrling, V. Panassik, Murrough Landon, Grzegorz Nowak, Pierre Marage, R. Koutouev, A. Petrukhin, M. Davidsson, R. Eichler, H. U. Martyn, Christian Veelken, P. Höting, Matthias Klein, S. Gorbounov, J. Rauschenberger, Michael R. Wessels, V. Lubimov, Paul Laycock, V. Brisson, Amanda R. Vest, E. Malinovski, Emmanuel Sauvan, G. Grindhammer, F. Eisele, S. Vassiliev, Jan Hladky, V. Andreev, A. D.R. Vargas Trevino, Dusan Bruncko, P. Van Mechelen, Laurent Schoeffel, Sascha Caron, N. Werner, E. Wünsch, I. Strauch, B. Leiner, Roland Horisberger, A. Valkárová, V. Jemanov, B. Naroska, Martin Karlsson, Dave Sankey, A. Beglarian, P. Dixon, J. Wagner, T. Kuhr, Philipp Fleischmann, Daniel Pitzl, D.P. Brown, E. Perez, Jean-Arcady Meyer, T. Greenshaw, Yves Sirois, J. Böhme, T. Laštovička, J. Formánek, A. Asmone, N. Delerue, M. zur Nedden, F. Cassol-Brunner, J.P. Phillips, L. Hajduk, Juergen Kroseberg, R. Gerhards, Dirk L. Hoffmann, G. Franke, E. Barrelet, G. D. Patel, K. Wacker, O. Behnke, K. Daum, Wolfgang Lange, A. Uraev, E. A. De Wolf, Ch. Berger, L. N. Shtarkov, J. Cvach, Anton Babaev, D. Traynor, J. Gayler, M. Hildebrandt, Georgios Tsipolitis, M. Urban, J. Ferencei, J. G. Contreras, J. Naumann, J.C. Bizot, P. E. Reimer, M. Fleischer, Karlheinz Meier, N. Malden, F. Tomasz, C. Risler, Angela Mehta, G. Knies, J. Marks, K. Gabathuler, Sebastian M. Schmidt, L. Bystritskaya, Claus Kleinwort, Zhen Zhang, G. G. Winter, I. Herynek, Fabian Zomer, Ricardo Lopez-Fernandez, David Schmidt, A. Aktas, P. A. Smirnov, Pavel Murin, Paul Newman, D. Wegener, Matthew Jones, Caroline Collard, B. Wessling, B. Olivier, H. Grässler, P. D. Thompson, L. Goerlich, M. Ibbotson, I. Sheviakov, S. Baumgartner, I. Foresti, G. Cozzika, C. Niebuhr, Bogdan Povh, F. Sefkow, S. Luders, Christian Johnson, Peter Robmann, Stefan Valkar, F. Keil, Denis Johnson, H.-B. Bröker, Hannes Jung, J. V. Morris, Alexander Zhokin, Laurent Favart, J. Zacek, T. Anthonis, A. Usik, M. Jacquet, B. Reisert, Graham Thompson, V. Efremenko, G. Weber, Martin Erdmann, T. Kluge, F. Niebergall, B. Koblitz, Ewelina Lobodzinska, Matthew Beckingham, U. Straumann, G. Frising, A. Bunyatyan, J. Becker, C. Vallée, H. Spitzer, V. Grabski, Benno List, S. Mikocki, Hans-Christian Schultz-Coulon, Beate Heinemann, Peter Truoel, S. Levonian, L. Lytkin, Anna Kropivnitskaya, S. Michine, V. Chekelian, R. Felst, J. Kueckens, D. Kant, I. Milcewicz-Mika, V. Spaskov, Guenter Eckerlin, Gero Flucke, A. Vichnevski, M. Kapichine, M. Nozicka, Cristinel Diaconu, J. Kennedy, V. Korbel, S. Backovic, Juraj Bracinik, André Schöning, Rainer Stamen, Y.R. Coppens, J. E. Olsson, A. Koutov, B. Delcourt, Johannes Haller, F. Moreau, K. Müller, Christian Schwanenberger, H. Lueders, A. B. Meyer, Judith Katzy, W. Erdmann, C. Pascaud, S. Egli, Stephen Maxfield, W. Bartel, J. Stiewe, S. Schätzel, J. Scheins, Alexandre Lebedev, M. Hilgers, C. Werner, Y.H. Fleming, J. Garvey, D. Haidt, A. M. Fomenko, W.D. Dau, J. B. Dainton, David South, J. D. Dowell, C. Gerlich, N. Gogitidze, T. J. Sloan, Eram Rizvi, G. Heinzelmann, V. Lendermann, V. Schröder, Y. Soloviev, V. Dodonov, C. Duprel, F. W. Büsser, W. Braunschweig, M. Ellerbrock, G. Herrera, Bradley Cox, I. R. Kenyon, T. Berndt, S. Ghazaryan, A. Burrage, Natasa Raicevic, F. P. Schilling, Vincent Boudry, S. D. Kolya, A. N. Morozov, R. Pöschl, V. Volchinski, R. Marshall, H. Henschel, K. Rybicki, J. Gassner, H. Meyer, R. Demirchyan, M. Winde, Christoph Grab, Xavier Janssen, B. M. Waugh, D.K. Nikitin, K. H. Hiller, R. C. W. Henderson, O. Henshaw, Jochen Dingfelder, R. Weber, A. Specka, C. Wissing, M.-O. Boenig, S. Mangano, S. Ferron, L. Janauschek, A. Rostovtsev, J. Bähr, A. Fedotov, Günter Flügge, C. Kiesling, A. De Roeck, E. Tzamariudaki, A. J. Campbell, K. Sedlak, Th. Naumann, E. Gabathuler, D. Meer, O. Behrendt, R. Lemrani, P. Kostka, J. Turnau, Michael Schneider, A. Dubak, Y. Vazdik, D. Lüke, M. Peez, David Milstead, A. Astvatsatourov, D. Clarke, John A Coughlan, B. Stella, N. Keller, Stefan Schmitt, J. Zalesak, R. Roosen, E. E. Elsen, R. Heremans, J. Martyniak, N. Loktionova, A. Hovhannisyan, I. Tsurin, M. C. Cousinou, J.E. Turney, P. Baranov, Peter Schleper, P.J.W. Faulkner, A.S. Belousov, and Sergey Rusakov
Subjects: Physics, Quantum chromodynamics, Particle physics, Physics and Astronomy (miscellaneous), Proton, Meson, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Hadron, Parton, HERA, Deep inelastic scattering, 01 natural sciences, Nuclear physics, Transverse plane, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010303 astronomy & astrophysics, Engineering (miscellaneous)
Abstract: Deep-inelastic positron-proton interactions at low values of Bjorken-x down to x \approx 4.10^-5 which give rise to high transverse momentum pi^0 mesons are studied with the H1 experiment at HERA. The inclusive cross section for pi^0 mesons produced at small angles with respect to the proton remnant (the forward region) is presented as a function of the transverse momentum and energy of the pi^0 and of the four-momentum transfer Q^2 and Bjorken-x. Measurements are also presented of the transverse energy flow in events containing a forward pi^0 meson. Hadronic final state calculations based on QCD models implementing different parton evolution schemes are confronted with the data.
Published: 2004

7. Muon pair production in ep collisions at HERA

Author: Wolfgang Lange, Laurent Schoeffel, J. Gayler, Paul Laycock, E. Malinovski, Emmanuel Sauvan, J. C. Bizot, Murrough Landon, Max Klein, C. Niebuhr, G. Grindhammer, N. Keller, J. Dingfelder, S. Egli, Y. Soloviev, V. Lendermann, V. Schröder, P. D. Thompson, S. Levonian, A. B. Meyer, K. Meier, Dusan Bruncko, S. Mangano, F. Eisele, H. U. Martyn, K. Sedlák, N. Werner, M. Ismail, David Milstead, S. Gorbounov, Y.R. Coppens, B. Naroska, J. B. Dainton, F. Moreau, J. Hladký, V. Korbel, Wolfram Erdmann, T. Kluge, J. E. Olsson, T. Greenshaw, J. G. Contreras, Pierre Marage, T. Kuhr, P. A. Smirnov, F. P. Schilling, A. Makankine, G. Buschhorn, D. Ozerov, R. Weber, J. V. Morris, S. D. Kolya, P. Van Mechelen, S. Michine, A. Bunyatyan, F. W. Büsser, J. Žáček, J. Haller, D. Kant, Stephen Maxfield, J. Ferencei, M. Martisikova, C. Veelken, R. D. Heuer, I. Morozov, L. Bystritskaya, M.-O. Boenig, P. Murín, J. Garvey, J. Scheins, C. Johnson, H. Zohrabyan, Hans-Christian Schultz-Coulon, J. Stiewe, A. Vichnevski, I. R. Kenyon, T. Berndt, C. Risler, A. M. Fomenko, J. D. Dowell, D.P. Brown, S. Ghazaryan, Alexandre Lebedev, W.D. Dau, B. Leißner, Natasa Raicevic, Vincent Boudry, K. Rybicki, Christoph Grab, D. Meer, J. Marks, Andrew Mehta, J. Bracinik, Claus Kleinwort, V. Lubimov, I. Sheviakov, S. Schmitt, C. Werner, D. Haidt, F. Tomasz, C. Gerlich, G. Thompson, O. Behnke, Martin Erdmann, S. Lüders, A. N. Morozov, Nicolas Berger, C. Berger, J. Formánek, M. Gregori, N. Gogitidze, W. Bartel, R. Eichler, G. Knies, S. Caron, T. J. Sloan, A. J. Campbell, B. E. Cox, K. H. Hiller, R. C. W. Henderson, Eram Rizvi, R. Pöschl, A. Rostovtsev, I. Strauch, Philipp Fleischmann, Peter Robmann, M. Winde, P. Baranov, M. Hildebrandt, Roland Horisberger, G. Heinzelmann, V. Dodonov, Daniel Pitzl, D. Traynor, M. Jacquet, A. Asmone, H. Grässler, M. Ibbotson, V. Spaskov, J. Kroseberg, Judith Katzy, H. Henschel, A. Valkárová, L. N. Shtarkov, F. Cassol-Brunner, K. Gabathuler, D.K. Nikitin, O. Henshaw, Paul Newman, D. Wegener, V. Grabski, W. Braunschweig, F. Zomer, J. Kückens, Y.H. Fleming, H. Spitzer, Rainer Stamen, L. Hajduk, C. Wissing, Laurent Favart, T. Anthonis, M. Wessels, D. South, E. Wünsch, C. Duprel, M. Urban, Adrian Perieanu, Dave Sankey, N. Delerue, M. Ellerbrock, V. Andreev, A. Specka, Thorsten Lux, L. Janauschek, Martin Karlsson, Gero Flucke, R. Marshall, B. Reisert, J. Bähr, G. Herrera, B. Waugh, G. Weber, M. C. Cousinou, U. Straumann, M. Kapichine, M. Nozicka, G. D. Patel, V. Jemanov, S. Backovic, B. Wessling, Thomas Naumann, V. Efremenko, B. Koblitz, V. Chekelian, D.P. Johnson, V. Nagovizin, N. Malden, Georgios Tsipolitis, H. Lueders, V. Volchinski, A. Vest, O. Behrendt, E. E. Woehrling, S. Vinokurova, M. Fleischer, S. Mikocki, J. Wagner, Yves Sirois, R. Lemrani, H. Meyer, Klaus Desch, J. Böhme, R. Demirchyan, P. Kostka, Karel Cerny, A. Uraev, G. Franke, J. Turnau, L. Lytkin, Cristinel Diaconu, B. List, A. Knutsson, A. Babaev, A. Aktas, S. Schätzel, Bogdan Povh, B. Olivier, Xavier Janssen, F. Sefkow, G. Ossoskov, I. Milcewicz, Leif J. Jönsson, K. Müller, Christian Schwanenberger, Grzegorz Nowak, R. Koutouev, A. Petrukhin, Zhen Zhang, J-P. Meyer, Ricardo Lopez-Fernandez, I. Foresti, S. Baumgartner, G. Cozzika, C. Pascaud, D. Hoffmann, Guenter Eckerlin, André Schöning, A. Usik, Stefan Valkar, G. Frising, J. Cvach, A. Belousov, Peter Schleper, H.-B. Bröker, Hannes Jung, J. Kennedy, Alexander Zhokin, J. Becker, C. Vallée, P.J.W. Faulkner, V. Brisson, R. Heremans, S. Vassiliev, Sergey Rusakov, P. Truöl, W. Yan, C. Collard, T. Laštovička, N. Loktionova, J. Gassner, A. Hovhannisyan, E. Barrelet, Z. Rurikova, I. Tsurin, B. Portheault, E. A. De Wolf, J. Zalesak, E. E. Elsen, J. Martyniak, R. Roosen, J. A. Coughlan, I. Herynek, B. Delcourt, B. Stella, K. Daum, J. Rauschenberger, A. D.R. Vargas Trevino, E. Perez, R. Gerhards, P. E. Reimer, G. G. Winter, J. Naumann, L. Goerlich, P. Höting, S. Schmidt, Ewelina Lobodzinska, Anna Kropivnitskaya, R. Felst, M. Beckingham, Matthias Ulrich Mozer, A. Fedotov, Günter Flügge, C. Kiesling, A. De Roeck, E. Tzamariudaki, E. Gabathuler, K. Wacker, A. Dubak, Y. Vazdik, D. Lüke, M. Schneider, M. Peez, H1 Collaboration, Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Damoiseaux, Magali
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), Muon, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, FOS: Physical sciences, HERA, Electron, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Standard Model, Nuclear physics, High Energy Physics - Experiment (hep-ex), Pair production, Full data, 0103 physical sciences, Transverse momentum, Physique des particules élémentaires, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract: Cross sections for the production of two isolated muons up to high di-muon masses are measured in ep collisions at HERA with the H1 detector in a data sample corresponding to an integrated luminosity of 71 pb-1 at a centre of mass energy of √s=319 GeV. The results are in good agreement with Standard Model predictions, the dominant process being photon-photon interactions. Additional muons or electrons are searched for in events with two high transverse momentum muons using the full data sample corresponding to 114 pb-1, where data at √s=301 GeV and √s=319 GeV are combined. Both the di-lepton sample and the tri-lepton sample agree well with the predictions. © 2004 Published by Elsevier B.V., 0, DESY-03-159 / hep-ex/0311015, SCOPUS: ar.j, info:eu-repo/semantics/published
Published: 2004

8. Search for new physics in e±q contact interactions at HERA

Author: V. Jemanov, C. Niebuhr, Laurent Schoeffel, Murrough Landon, Paul Richard Newman, Grzegorz Nowak, N. Loktionova, J. Gassner, A. Hovhannisyan, J.G. Contreras, I. Tsurin, M. C. Cousinou, J.E. Turney, P. Baranov, Peter Schleper, S. Egli, T. J. Sloan, P.J.W. Faulkner, A.S. Belousov, Sergey Rusakov, P. Truöl, R. Koutouev, A. Petrukhin, S. Mangano, D. Lüke, C. Wissing, J. Zalesak, Y. Soloviev, E. Wünsch, P. Höting, L. Janauschek, I. Potachnikova, J. Martyniak, S. Lüders, G. Buschhorn, D. Ozerov, V. Lubimov, Dusan Bruncko, B. Naroska, K. H. Hiller, T. Kluge, T. Greenshaw, Rainer Wallny, A. Astvatsatourov, Paul Laycock, E. Malinovski, F. P. Schilling, Doris Eckstein, P. Van Mechelen, R. C. W. Henderson, E. Eisenhandler, R. Pöschl, J. Cvach, G. Grindhammer, G. D. Patel, D.P. Johnson, J. Ferencei, J. Naumann, J. Marks, J. Formánek, J. Dingfelder, N. Werner, D. Clarke, B. Waugh, Claus Kleinwort, S. Baumgartner, N. Malden, Wolfram Erdmann, B. List, M. zur Nedden, Pierre Marage, John A Coughlan, I. Sheviakov, J. Rauschenberger, G. Weber, U. Straumann, D. Kant, David Schmidt, K. Sedlák, O. Karschnick, K. Gabathuler, K. Rybicki, D. Wegener, W.J. Haynes, S. Schmidt, J. V. Morris, C. Risler, K. Daum, S. Mohrdieck, D. P. C. Sankey, A. Specka, Caroline Collard, Christoph Grab, J. Kennedy, V. Brisson, S. Vassiliev, J. Wagner, A. D.R. Vargas Trevino, C. Adloff, F. Keil, H. Meyer, R. Demirchyan, M.N. Mondragon, A. Bunyatyan, Leif J. Jönsson, V. Efremenko, B. Koblitz, Markus Wobisch, Xavier Janssen, J. Böhme, Stephen Maxfield, L. N. Shtarkov, F. Tomasz, V. Spaskov, R. Maraček, R. Marshall, Ewelina Lobodzinska, A. Beglarian, Pavel Murin, H. Grässler, K. Wacker, J. Stiewe, O. Behnke, S. Mikocki, A. Uraev, G. Knies, J-P. Meyer, Martin Erdmann, J. Žáček, M. Ibbotson, A. Knutsson, T. Schörner-Sadenius, T. Laštovička, R. Felst, Matthew Jones, B. Stella, F. Niebergall, Stefan Schmitt, Andrew Mehta, E. Barrelet, P. Dixon, Hans-Christian Schultz-Coulon, Glenn J. White, M. Hildebrandt, A. Vichnevski, A. Lebedev, F. Sefkow, V. Chekelian, V. Korbel, P. Kjellberg, F. Moreau, J. Hladký, J. D. Dowell, B. Lobodzinski, A. Vest, A. Rostovtsev, N. Gogitidze, V. Nagovizin, A. Droutskoi, D. Haidt, E. Perez, S. Caron, V. Panassik, E. A. De Wolf, Ch. Berger, Karlheinz Meier, R. Roosen, S. Hengstmann, Judith Katzy, S. Hurling, Eram Rizvi, G. Heinzelmann, R. Eichler, R. Gerhards, M. Winde, S. D. Kolya, V. Dodonov, L. Lytkin, E.-E. Woehrling, C. Werner, Laurent Favart, T. Anthonis, Cristinel Diaconu, Ç. İşsever, T. Wilksen, P. E. Reimer, C. Johnson, F. Zomer, C. Duprel, I. Herynek, Daniel Pitzl, V. Andreev, L. Bystritskaya, R. Lemrani, P. Kostka, J. Turnau, T. Kuhr, B. Reisert, J. Bähr, S. Levonian, I. R. Kenyon, G. G. Winter, D. Traynor, H. U. Martyn, O. Nix, F. Cassol-Brunner, S. K. Kotelnikov, L. Hajduk, D. South, M. Wessels, M. Urban, H. Spitzer, D.P. Brown, J. Haller, Yves Sirois, M. Ellerbrock, G. Thompson, B. Andrieu, S. Ghazaryan, M. Davidsson, Bradley Cox, G. Franke, Katja Krüger, L. Goerlich, S. Michine, Roland Horisberger, A. Valkárová, H. Henschel, J.C. Bizot, N. Delerue, K. Müller, Christian Schwanenberger, Anton Babaev, I. Foresti, G. Cozzika, F. Eisele, J.P. Phillips, Stefan Valkar, H.-B. Bröker, Martin Karlsson, Hannes Jung, D. Lamb, Alexander Zhokin, J. Becker, C. Vallée, R. Heremans, M. Kapichine, M. Nozicka, A. Koutov, B. Delcourt, S. Schätzel, N. Keller, V. Lendermann, V. Schröder, Eckhard Elsen, Wolfgang Lange, J. Gayler, R. Stamen, Peter Robmann, J. Scheins, W.D. Dau, J. B. Dainton, B. Leißner, A. Loginov, M. Jacquet, Zhen Zhang, T. Hadig, G. Herrera, V. Grabski, D. Hoffmann, Andreas Meyer, D. Meer, A. Usik, G. Frising, Y. R. Coppens, Max Klein, I. Strauch, Philipp Fleischmann, Beate Heinemann, David Milstead, C. Pascaud, P. A. Smirnov, Guenter Eckerlin, S. Ferron, S. Wiesand, Th. Naumann, M. Jaffre, J. E. Olsson, W. Bartel, M. Hilgers, J. Garvey, F. W. Büsser, W. Braunschweig, A. M. Fomenko, E. Lebailly, C. Gerlich, T. Berndt, A. Burrage, E. Gabathuler, J. Kroseberg, Vincent Boudry, Y. H. Fleming, A. N. Morozov, Georgios Tsipolitis, M. Fleischer, A. Schöning, Bogdan Povh, A. Dubak, Y. Vazdik, P.D. Thompson, S. Tchetchelnitski, M. Schneider, M. Peez, M. Beckingham, A. Fedotov, Günter Flügge, C. Kiesling, A.C. Wyatt, A. De Roeck, E. Tzamariudaki, A. J. Campbell, and H1 Collaboration
Subjects: Quark, Physics, Nuclear and High Energy Physics, Particle physics, Neutral current, Physics beyond the Standard Model, High Energy Physics::Phenomenology, Momentum transfer, FOS: Physical sciences, HERA, Supersymmetry, High Energy Physics - Experiment, Standard Model, Nuclear physics, High Energy Physics - Experiment (hep-ex), Large extra dimension, High Energy Physics::Experiment
Abstract: Deep-inelastic e^\pm p scattering at high squared momentum transfer Q^2 up to 30000 GeV^2 is used to search for eq contact interactions associated to scales far beyond the HERA centre of mass energy. The neutral current cross section measurements d sigma / d Q^2, corresponding to integrated luminosities of 16.4 pb^-1 of e^- p data and 100.8 pb^-1 of e^+ p data, are well described by the Standard Model and are analysed to set constraints on new phenomena. For conventional contact interactions lower limits are set on compositeness scales Lambda ranging between 1.6 - 5.5 TeV. Couplings and masses of leptoquarks and squarks in R-parity violating supersymmetry are constrained to M / lambda > 0.3 - 1.4 TeV. A search for low scale quantum gravity effects in models with large extra dimensions provides limits on the effective Planck scale of M_S > 0.8 TeV. A form factor analysis yields a bound on the radius of light quarks of R_q < 1.0 x 10^-18 m., 15 pages, 5 figures and 5 tables
Published: 2003

9. Elastic photoproduction of J/ψ and ϒ mesons at HERA

Author: C. Adloff, V. Andreev, B. Andrieu, V. Arkadov, A. Astvatsatourov, I. Ayyaz, A. Babaev, J. Bähr, P. Baranov, E. Barrelet, W. Bartel, U. Bassler, P. Bate, A. Beglarian, O. Behnke, C. Beier, A. Belousov, T. Benisch, Ch. Berger, G. Bernardi, T. Berndt, J.C. Bizot, K. Borras, V. Boudry, W. Braunschweig, V. Brisson, H.-B. Bröker, D.P. Brown, W. Brückner, P. Bruel, D. Bruncko, J. Bürger, F.W. Büsser, A. Bunyatyan, H. Burkhardt, A. Burrage, G. Buschhorn, A.J. Campbell, J. Cao, T. Carli, S. Caron, E. Chabert, D. Clarke, B. Clerbaux, C. Collard, J.G. Contreras, J.A. Coughlan, M.-C. Cousinou, B.E. Cox, G. Cozzika, J. Cvach, J.B. Dainton, W.D. Dau, K. Daum, M. David, M. Davidsson, B. Delcourt, N. Delerue, R. Demirchyan, A. De Roeck, E.A. De Wolf, C. Diaconu, P. Dixon, V. Dodonov, J.D. Dowell, A. Droutskoi, C. Duprel, G. Eckerlin, D. Eckstein, V. Efremenko, S. Egli, R. Eichler, F. Eisele, E. Eisenhandler, M. Ellerbrock, E. Elsen, M. Erdmann, W. Erdmann, P.J.W. Faulkner, L. Favart, A. Fedotov, R. Felst, J. Ferencei, S. Ferron, M. Fleischer, G. Flügge, A. Fomenko, I. Foresti, J. Formánek, J.M. Foster, G. Franke, E. Gabathuler, K. Gabathuler, J. Garvey, J. Gassner, J. Gayler, R. Gerhards, S. Ghazaryan, L. Goerlich, N. Gogitidze, M. Goldberg, C. Goodwin, C. Grab, H. Grässler, T. Greenshaw, G. Grindhammer, T. Hadig, D. Haidt, L. Hajduk, T. Hauschildt, W.J. Haynes, B. Heinemann, G. Heinzelmann, R.C.W. Henderson, S. Hengstmann, H. Henschel, R. Heremans, G. Herrera, I. Herynek, M. Hilgers, K.H. Hiller, C.D. Hilton, J. Hladký, P. Höting, D. Hoffmann, W. Hoprich, R. Horisberger, S. Hurling, M. Ibbotson, Ç. İşsever, M. Jacquet, M. Jaffre, L. Janauschek, D.M. Jansen, X. Janssen, V. Jemanov, L. Jönsson, D.P. Johnson, M.A.S. Jones, H. Jung, H.K. Kästli, D. Kant, M. Kapichine, M. Karlsson, O. Karschnick, O. Kaufmann, M. Kausch, F. Keil, N. Keller, J. Kennedy, I.R. Kenyon, S. Kermiche, C. Kiesling, M. Klein, C. Kleinwort, G. Knies, B. Koblitz, H. Kolanoski, S.D. Kolya, V. Korbel, P. Kostka, S.K. Kotelnikov, M.W. Krasny, H. Krehbiel, J. Kroseberg, D. Krücker, K. Krüger, A. Küpper, T. Kuhr, T. Kurča, R. Kutuev, W. Lachnit, R. Lahmann, D. Lamb, M.P.J. Landon, W. Lange, T. Laštovička, A. Lebedev, B. Leißner, R. Lemrani, V. Lendermann, S. Levonian, M. Lindstroem, B. List, E. Lobodzinska, B. Lobodzinski, N. Loktionova, V. Lubimov, S. Lüders, D. Lüke, L. Lytkin, N. Magnussen, H. Mahlke-Krüger, N. Malden, E. Malinovski, I. Malinovski, R. Maraček, P. Marage, J. Marks, R. Marshall, H.-U. Martyn, J. Martyniak, S.J. Maxfield, A. Mehta, K. Meier, P. Merkel, F. Metlica, A. Meyer, H. Meyer, J. Meyer, P.-O. Meyer, S. Mikocki, D. Milstead, T. Mkrtchyan, R. Mohr, S. Mohrdieck, M.N. Mondragon, F. Moreau, A. Morozov, J.V. Morris, D. Müller, K. Müller, P. Murı́n, V. Nagovizin, B. Naroska, J. Naumann, Th. Naumann, I. Négri, G. Nellen, P.R. Newman, T.C. Nicholls, F. Niebergall, C. Niebuhr, O. Nix, G. Nowak, T. Nunnemann, J.E. Olsson, D. Ozerov, V. Panassik, C. Pascaud, G.D. Patel, E. Perez, J.P. Phillips, D. Pitzl, R. Pöschl, I. Potachnikova, B. Povh, K. Rabbertz, G. Rädel, J. Rauschenberger, P. Reimer, B. Reisert, D. Reyna, S. Riess, E. Rizvi, P. Robmann, R. Roosen, A. Rostovtsev, C. Royon, S. Rusakov, K. Rybicki, D.P.C. Sankey, J. Scheins, F.-P. Schilling, S. Schleif, P. Schleper, D. Schmidt, L. Schoeffel, A. Schöning, T. Schörner, V. Schröder, H.-C. Schultz-Coulon, K. Sedlák, F. Sefkow, V. Shekelyan, I. Sheviakov, L.N. Shtarkov, G. Siegmon, P. Sievers, Y. Sirois, T. Sloan, P. Smirnov, V. Solochenko, Y. Soloviev, V. Spaskov, A. Specka, H. Spitzer, R. Stamen, J. Steinhart, B. Stella, A. Stellberger, J. Stiewe, U. Straumann, W. Struczinski, M. Swart, M. Taševský, V. Tchernyshov, S. Tchetchelnitski, G. Thompson, P.D. Thompson, N. Tobien, D. Traynor, P. Truöl, G. Tsipolitis, J. Turnau, J.E. Turney, E. Tzamariudaki, S. Udluft, A. Usik, S. Valkár, A. Valkárová, C. Vallée, P. Van Mechelen, Y. Vazdik, S. von Dombrowski, K. Wacker, R. Wallny, T. Walter, B. Waugh, G. Weber, M. Weber, D. Wegener, A. Wegner, T. Wengler, M. Werner, G. White, S. Wiesand, T. Wilksen, M. Winde, G.-G. Winter, C. Wissing, M. Wobisch, H. Wollatz, E. Wünsch, A.C. Wyatt, J. Žáček, J. Zálešák, Z. Zhang, A. Zhokin, F. Zomer, J. Zsembery, and M. zur Nedden
Subjects: Physics, Scattering cross-section, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Meson, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Perturbative QCD, Sigma, HERA, Regge theory, Pomeron, High Energy Physics::Experiment, Nuclear Experiment
Abstract: Cross sections for elastic photoproduction of J/Psi and Upsilon mesons are presented. For J/Psi mesons the dependence on the photon-proton centre-of-mass energy W_gammap is analysed in an extended range with respect to previous measurements of 26
Published: 2000

10. Search for contact interactions and leptoquarks at HERA

Author: J. Scheins
Subjects: Scattering cross-section, Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Leptoquark, HERA, Atomic and Molecular Physics, and Optics, Standard Model
Abstract: The measured single differential cross section d σ d Q 2 is compared to the Standard Model expectation and analyzed to search for ( e e) ( q q) contact interactions. No significant deviation is observed and limits on leptonquark compositeness scales and virtual leptoquark exchange are presented.
Published: 1999

11. Measurement of Dijet Cross Sections in ep Interactions with a Leading Neutron at HERA

Author: V. Andreev, Peter Robmann, Yves Sirois, Magnus Hansson, Dirk L. Hoffmann, J. C. Bizot, G. Franke, C. Risler, S. Backovic, E. Wünsch, J. Žáček, Hans-Christian Schultz-Coulon, R. Eichler, Dave Sankey, H. Lueders, F. Eisele, R. Oganezov, K. Sedlák, J. E. Olsson, W. Bartel, Fabian Zomer, Dusan Bruncko, C. Gwilliam, S. Levonian, B. Naroska, G. D. Patel, H. Meyer, Malte Hildebrandt, Laurent Schoeffel, S. Schmidt, Wolfram Erdmann, D.P. Johnson, A. M. Fomenko, Paul Laycock, E. Malinovski, Pierre Marage, A. Makankine, T. Greenshaw, G. Buschhorn, D. Ozerov, R. Weber, Emmanuel Sauvan, B. Vujicic, F. W. Büsser, N. Malden, G. Grindhammer, Erika Garutti, C. Gerlich, I. Foresti, G. Cozzika, N. Werner, Matthew Beckingham, Anna Kropivnitskaya, A. DeRoeck, R. Felst, P. Baranov, I. R. Kenyon, J. Ferencei, M. Martisikova, J. Naumann, L. Finke, Stefan Valkar, Natasa Raicevic, C. Wigmore, David South, F. Salvaire, D. Haidt, K. Daum, I. Glushkov, Wolfgang Lange, I. Milcewicz-Mika, J. Gayler, John A Coughlan, S. Ghazaryan, Vincent Boudry, F. Tomasz, Claus Kleinwort, A. N. Morozov, G. Knies, Leif J. Jönsson, Benoit Roland, K. Krüger, A. Nikiforov, D. Perez-Astudillo, M. Gregori, C. Goyon, Eram Rizvi, T. J. Sloan, P.J.W. Faulkner, A.S. Belousov, B. Stella, T. Klimkovich, Th. Naumann, M. Peez, G. Heinzelmann, V. Dodonov, Sergey Rusakov, P. Truöl, T. Frisson, I. Strauch, Philipp Fleischmann, R. Pöschl, R. Marshall, Zhen Zhang, S. Caron, Ricardo Lopez-Fernandez, Murrough Landon, S. Baumgartner, S. Gorbounov, O. Behnke, V. Chekelian, J. V. Morris, Andreas Meyer, D.K. Nikitin, E. Gabathuler, O. Henshaw, A. Bunyatyan, P. Van Mechelen, A. Usik, Klaus Desch, R. D. Heuer, G. Frising, A. Rimmer, C. Wissing, A. Knutsson, D. Wegener, Thorsten Lux, L. Janauschek, N. Van Remortel, V. Efremenko, S. Mikocki, M. Jacquet, E. E. Elsen, V. Lubimov, A. Dubak, M. Goettlich, K. Nankov, L. N. Shtarkov, J. Formánek, Stephen Maxfield, Sakar Osman, J. Stiewe, J. Scheins, I. Sheviakov, S. Schmitt, Adrian Perieanu, C. Veelken, Andrew Mehta, J. Bracinik, W.D. Dau, J. B. Dainton, N. Gogitidze, B. Portheault, Gerhard Brandt, Daniel Pitzl, B. Leißner, D. Meer, J. Zálešák, D. Traynor, V. Volchinski, V. Spaskov, Judith Katzy, F. Cassol-Brunner, R. Demirchyan, A. Asmone, J. Kückens, K. Wacker, L. Hajduk, Y.H. Fleming, Xavier Janssen, Max Klein, W. Yan, Georgios Tsipolitis, M. Fleischer, N. Loktionova, M. Urban, A. Hovhannisyan, K. Krastev, R. Plačakyte, I. Tsurin, E. Lobodzinska, Bogdan Povh, L. Lindfeld, F. Sefkow, M. Ismail, David Milstead, T. Kluge, Jan Kretzschmar, P. A. Smirnov, M. Wessels, Guenter Eckerlin, André Schöning, M. Ellerbrock, L. Goerlich, B. Delcourt, H. U. Martyn, G. Herrera, Bradley Cox, R. Wolf, B. Wessling, M.-O. Boenig, Matthias Ulrich Mozer, A. Fedotov, T. Laštovička, Nicolas Berger, P. D. Thompson, A. Vest, S. Ginzburgskaya, O. Behrendt, S. Vinokurova, A. Zhelezov, S. Baudrand, V. Yeganov, J. Zimmermann, J-P. Meyer, C. Kiesling, P. Kostka, E. Barrelet, E. Tzamariudaki, A. J. Campbell, D.P. Brown, J. Haller, L. Bystritskaya, J. Turnau, S. Mangano, Z. Rurikova, V. Jemanov, I. Tsakov, Roland Horisberger, A. Valkárová, H. Zohrabyan, Ch. Berger, F. Moreau, Karlheinz Meier, R. Roosen, Martin Karlsson, S. J. Aplin, K. Müller, C. Pascaud, Christian Schwanenberger, I. Herynek, L. Lytkin, Cristinel Diaconu, Y. Vazdik, D. Lüke, B. List, Stefania Xella, A. Aktas, S. Essenov, Katerina Lipka, J. Wagner, J. Cvach, V. Tchoulakov, R. Koutouev, A. Petrukhin, V. Brisson, A. D.R. Vargas Trevino, Anton Babaev, J. G. Contreras, A. Mohamed, P. Prideaux, Pavel Murin, M. Ibbotson, Karel Cerny, E. Perez, C. Schmitz, Hannes Jung, Alexander Zhokin, J. Becker, C. Vallée, B. Olivier, Laurent Favart, T. Anthonis, R. Gerhards, P. E. Reimer, G. G. Winter, A. Glazov, Gero Flucke, M. Kapichine, M. Nozicka, E. A. DeWolf, S. Schätzel, A. Baghdasaryan, A. Rostovtsev, N. Keller, G. Nowak, G. Thompson, V. Lendermann, V. Schröder, H. Henschel, D. Utkin, J. Bähr, C. Niebuhr, S. Egli, Y. Soloviev, Paul Newman, F. P. Schilling, Christoph Grab, A.-I. Lucaci-Timoce, K. H. Hiller, R. C. W. Henderson, G. Weber, U. Straumann, A. Specka, V. Korbel, Alexandre Lebedev, C. Werner, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), H1, Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and H1 Collaboration
Subjects: Particle physics, Physics and Astronomy (miscellaneous), Nuclear Theory, FOS: Physical sciences, Virtual particle, Parton, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Pion, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Neutron, 010306 general physics, Nuclear Experiment, Engineering (miscellaneous), Quantum chromodynamics, Physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Perturbative QCD, HERA, Deep inelastic scattering, 3. Good health, High Energy Physics::Experiment
Abstract: Measurements are reported of the production of dijet events with a leading neutron in ep interactions at HERA. Differential cross sections for photoproduction and deep inelastic scattering are presented as a function of several kinematic variables. Leading order QCD simulation programs are compared with the measurements. Models in which the real or virtual photon interacts with a parton of an exchanged pion are able to describe the data. Next-to-leading order perturbative QCD calculations based on pion exchange are found to be in good agreement with the measured cross sections. The fraction of leading neutron dijet events with respect to all dijet events is also determined. The dijet events with a leading neutron have a lower fraction of resolved photon processes than do the inclusive dijet data., 27 pages, 9 figures, 5 tables
Published: 2005

12. Search for leptoquark bosons in $ep$ collisions at HERA

Author: Stephen Maxfield, M. Kapichine, J. Stiewe, M. C. Cousinou, Andrew Mehta, N. Gogitidze, J. Cvach, Beate Heinemann, S. Hengstmann, M. Ellerbrock, Bradley Cox, Ç. İşsever, T. Wilksen, A. Beglarian, D. Kant, C. Pascaud, J. Zsembery, J. V. Morris, K. Müller, Christian Schwanenberger, V. Nagovizin, Guenter Eckerlin, André Schöning, A. Dubak, J. Rauschenberger, E. E. Woehrling, Pavel Murin, M. Taševský, H. Grässler, V. Panassik, M. Ibbotson, P.-O. Meyer, A. Bunyatyan, H. Mahlke-Krüger, Laurent Schoeffel, A. Koutov, B. Delcourt, R. Mohr, Y.H. Fleming, Grzegorz Nowak, R. Koutouev, J.E. Turney, C. Adloff, Murrough Landon, J. Kroseberg, Wolfram Erdmann, P. Baranov, Peter Schleper, C. Duprel, T. Kuhr, K. Gabathuler, P. D. Thompson, I. Sheviakov, E. Perez, Laurent Favart, T. Anthonis, H. Krehbiel, G. Buschhorn, D. Ozerov, R. Gerhards, N. Tobien, Paul Laycock, E. Malinovski, V. Tchernyshov, C. Risler, V. Korbel, P. Van Mechelen, K. Sedlák, Glenn J. White, F. Moreau, J. Hladký, B. Lobodzinski, P. E. Reimer, G. Grindhammer, D. Meer, C. Beier, J. Dingfelder, T. J. Sloan, P.J.W. Faulkner, A.S. Belousov, Sergey Rusakov, J. Kennedy, Georgios Tsipolitis, M. Fleischer, S. Ghazaryan, Daniel Johnson, L. Goerlich, R. Heremans, V. Brisson, D. Wegener, W.J. Haynes, Caroline Collard, Martin Erdmann, Y. Vazdik, N. Werner, G. G. Winter, O. Nix, S. D. Kolya, H. Meyer, R. Demirchyan, J. Scheins, K. H. Hiller, Roland Horisberger, S. Vassiliev, Xavier Janssen, P. Truöl, F. Niebergall, S. Tchetchelnitski, I. Malinovski, A. Valkárová, Barbara Clerbaux, Katja Krüger, V. Jemanov, V. Spaskov, R. C. W. Henderson, F. Zomer, P. Höting, Bogdan Povh, R. Pöschl, M. Schneider, M. Hildebrandt, M. Peez, C. Johnson, K. Daum, O. Karschnick, K. Wacker, M. Swart, V. Andreev, T. Laštovička, S. Wiesand, Max Weber, G. Knies, S. Caron, H. U. Martyn, J. D. Burger, V. Efremenko, Robert Lahmann, Martin Karlsson, B. Koblitz, E. Barrelet, C. Werner, W.D. Dau, J. B. Dainton, B. Leißner, M. Winde, Matthew Jones, Dusan Bruncko, B. List, M. Davidsson, R. Eichler, J. Garvey, W. Brückner, B. Naroska, Yves Sirois, S. Mikocki, N. Loktionova, Klaus Rabbertz, A. Fedotov, A. M. Fomenko, J. D. Dowell, Günter Flügge, C. Wissing, E. A. De Wolf, Ch. Berger, G. Radel, Karlheinz Meier, J. Gassner, S. Kermiche, V. Shekelyan, E. Lebailly, C. Gerlich, A. Specka, T. Schorner, D. Reyna, T. Greenshaw, G. Franke, J. Žáček, N. Keller, S. Schmidt, D.P. Brown, J. Haller, Paul Newman, R. Lemrani, C. Kiesling, D. South, R. Marshall, J.G. Contreras, L. Janauschek, V. Schröder, J. Boehme, A.C. Wyatt, Doris Eckstein, A. De Roeck, E. Tzamariudaki, A. J. Campbell, Eckhard Elsen, P. Dixon, Hans-Christian Schultz-Coulon, A. Loginov, P. Kostka, I. Foresti, G. Cozzika, A. Vichnevski, I. Potachnikova, I. Herynek, F. Eisele, E. Eisenhandler, J. Ferencei, J. Naumann, I. Tsurin, J. Turnau, J.P. Phillips, Stefan Valkar, J-P. Meyer, M. Jacquet, F. Keil, J. Zalesak, R. Roosen, T. Kurča, B. Waugh, G. Weber, M. zur Nedden, N. Delerue, U. Straumann, H.-B. Bröker, Hannes Jung, M. Lindstroem, T. Kluge, J. Martyniak, J. Marks, Alexander Zhokin, G. Nellen, Claus Kleinwort, P. Bate, Ewelina Lobodzinska, Anton Babaev, Th. Naumann, J. Formánek, J. Becker, C. Vallée, P. Kjellberg, L. Bystritskaya, B. Andrieu, E. Gabathuler, T. Benisch, G. Thompson, S. Hurling, R. Felst, H. Henschel, J.C. Bizot, M. Goldberg, Max Klein, David Milstead, P. A. Smirnov, M. Jaffre, J. E. Olsson, W. Bartel, V. Lendermann, F. W. Büsser, W. Braunschweig, I. R. Kenyon, T. Berndt, A. Burrage, Vincent Boudry, A. N. Morozov, Tigran Mkrtchyan, V. Lubimov, M.N. Mondragon, Leif J. Jönsson, R. Maraček, Markus Wobisch, L. N. Shtarkov, H. Spitzer, A. Küpper, S. Levonian, Y.R. Coppens, M. Werner, M. Hilgers, S. Udluft, A. Lebedev, F. Sefkow, Rainer Wallny, A. Astvatsatourov, D. Haidt, S. Ferron, Eram Rizvi, G. Heinzelmann, V. Dodonov, D. Clarke, John A Coughlan, D. Lüke, E. Wünsch, Dave Sankey, B. Stella, Stefan Schmitt, G. D. Patel, N. Malden, S. Lüders, David Schmidt, Zhen Zhang, T. Hadig, G. Herrera, V. Arkadov, Pierre Marage, D. Hoffmann, S. Mohrdieck, Andreas Meyer, A. Usik, O. Behnke, D. Lamb, L. Lytkin, Cristinel Diaconu, Daniel Pitzl, D. Traynor, F. Cassol-Brunner, S. K. Kotelnikov, L. Hajduk, T.C. Nicholls, M. Urban, Peter Robmann, Jun Cao, Wolfgang Lange, J. Gayler, R. Stamen, A. Rostovtsev, A. Droutskoi, B. Reisert, J. Bähr, C. Niebuhr, S. Egli, Y. Soloviev, F. P. Schilling, K. Rybicki, Christoph Grab, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, H1 Collaboration, Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), Neutral current, 010308 nuclear & particles physics, Scalar (mathematics), FOS: Physical sciences, HERA, Fermion, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Leptoquark, High Energy Physics::Experiment, 010306 general physics, Charged current, Boson
Abstract: A search for scalar and vector leptoquarks coupling to first generation fermions is performed using the e^+p and e^-p scattering data collected by the H1 experiment between 1994 and 2000. The data correspond to a total integrated luminosity of 117 pb^{-1}. No evidence for the direct or indirect production of such particles is found in data samples with a large transverse momentum final state electron or with large missing transverse momentum. Constraints on leptoquark models are established. For leptoquark couplings of electromagnetic strength, leptoquarks with masses up to 275-325 GeV are ruled out. These limits improve and supercede earlier H1 limits based on subsamples of the data used here., 15 pages, 1 table, 5 figures
Published: 2005

13. Inclusive Production of $D^+, D^0, D_s^+ and D^*+$ Mesons in Deep Inelastic Scattering at HERA

Author: J-P. Meyer, Paul Laycock, E. Malinovski, Emmanuel Sauvan, Pavel Murin, H. Grässler, G. Grindhammer, M. Ibbotson, J. Dingfelder, N. Werner, A. Makankine, G. Buschhorn, T. Kuhr, Leif J. Jönsson, Benoit Roland, J. Garvey, S. Caron, A. M. Fomenko, D. Ozerov, R. Weber, Laurent Favart, T. Anthonis, C. Gerlich, T. Klimkovich, G. Thompson, P. Höting, S. Michine, J. Kroseberg, B. Portheault, Georgios Tsipolitis, M. Fleischer, T. Laštovička, Bogdan Povh, F. Sefkow, G. Ossoskov, P. D. Thompson, V. Yeganov, Th. Naumann, D.K. Nikitin, O. Henshaw, C. Pascaud, Guenter Eckerlin, André Schöning, L. Lytkin, H. Henschel, E. Barrelet, S. Mangano, J. Žáček, I. Strauch, B. Wessling, Philipp Fleischmann, Cristinel Diaconu, Z. Rurikova, V. Jemanov, M.-O. Boenig, J.C. Bizot, Fabian Zomer, Laurent Schoeffel, Daniel Pitzl, V. Chekelian, V. Nagovizin, S. Schmidt, V. Lubimov, E. A. De Wolf, Ch. Berger, Karlheinz Meier, R. Roosen, E. Gabathuler, D. Traynor, Hans-Christian Schultz-Coulon, I. Foresti, Wolfram Erdmann, E. Wünsch, G. Cozzika, E. E. Woehrling, Murrough Landon, Dave Sankey, Wolfgang Lange, R. Plačakyte, Roland Horisberger, L. Hajduk, Stefan Valkar, A. Valkárová, Nicolas Berger, A. Rostovtsev, Magnus Hansson, J. Gayler, M. Ismail, David Milstead, Paul Newman, H. U. Martyn, Matthias Klein, I. Herynek, B. List, S. Gorbounov, A. Aktas, G. D. Patel, K. Wacker, H. Meyer, P. A. Smirnov, Grzegorz Nowak, H.-B. Bröker, Hannes Jung, Alexander Zhokin, Dusan Bruncko, S. Ghazaryan, J. Becker, D.P. Johnson, L. N. Shtarkov, B. Naroska, B. Olivier, R. Koutouev, A. Petrukhin, C. Wissing, Klaus Desch, A. Dubak, N. Malden, Pierre Marage, H. Spitzer, A. Rimmer, R. Heremans, R. Eichler, Adrian Perieanu, Martin Karlsson, T. Kluge, T. Greenshaw, Erika Garutti, L. Goerlich, Peter Robmann, I. Morozov, Y. Vazdik, A. Knutsson, D. Lüke, A. Nikiforov, C. Vallée, M. Peez, Stefania Xella, D. Kant, P. Van Mechelen, L. Bystritskaya, D. Utkin, B. Reisert, J. Ferencei, M. Martisikova, J. Naumann, J. Bähr, V. Volchinski, Thorsten Lux, L. Janauschek, N. Van Remortel, D. Haidt, G. Weber, R. Demirchyan, U. Straumann, A. Vest, Gero Flucke, M. Kapichine, O. Behnke, M. Beckingham, D.P. Brown, J. Haller, J. Marks, Claus Kleinwort, M. Nozicka, Xavier Janssen, C. Niebuhr, J. Scheins, S. Levonian, O. Behrendt, S. Vinokurova, H. Zohrabyan, R. Lemrani, P. Kostka, R. D. Heuer, S. Egli, Eram Rizvi, G. Heinzelmann, V. Dodonov, J. Kennedy, V. Brisson, Matthias Ulrich Mozer, A. Fedotov, R. Pöschl, Katerina Lipka, V. Andreev, W.D. Dau, J. B. Dainton, I. Sheviakov, S. Schmitt, M. Schneider, V. Tchoulakov, J. Turnau, B. Delcourt, J. Graves, K. Müller, P. E. Reimer, S. Backovic, H. Lueders, Z. Ratiani, V. Korbel, B. Leißner, Christian Schwanenberger, Y.R. Coppens, K. Daum, Y. Soloviev, Anton Babaev, C. Risler, A. Specka, Martin Erdmann, F. P. Schilling, S. Schätzel, C. Gwilliam, J. V. Morris, M. Urban, Günter Flügge, C. Kiesling, A. De Roeck, E. Tzamariudaki, A. J. Campbell, K. H. Hiller, M. Jacquet, N. Keller, F. Tomasz, G. Knies, R. C. W. Henderson, J. G. Contreras, A. Mohamed, V. Lendermann, V. Schröder, A. Bunyatyan, J. Zálešák, V. Spaskov, J. Kückens, Yves Sirois, K. Rybicki, G. G. Winter, David South, Christoph Grab, Judith Katzy, A. Asmone, Alexandre Lebedev, Y.H. Fleming, C. Veelken, C. Werner, Rainer Stamen, Dirk L. Hoffmann, G. Franke, D. Meer, C. Duprel, I. Milcewicz-Mika, F. Eisele, J. Cvach, J. Wagner, R. Oganezov, K. Sedlák, F. Cassol-Brunner, J. Böhme, Karel Cerny, A. Uraev, Stephen Maxfield, J. Stiewe, Andrew Mehta, J. Bracinik, N. Gogitidze, A. D.R. Vargas Trevino, M. Schneebeli, M. Wessels, M. Ellerbrock, G. Herrera, Bradley Cox, R. Wolf, R. Gerhards, E. E. Elsen, Zhen Zhang, K. Gabathuler, D. Wegener, Ricardo Lopez-Fernandez, V. Boudry, Emmanuelle Perez, Caroline Collard, S. Baumgartner, V. Efremenko, B. Koblitz, Andreas Meyer, S. Mikocki, A. Usik, G. Frising, J. E. Olsson, W. Bartel, J. Formánek, Malte Hildebrandt, F. W. Büsser, I. R. Kenyon, T. Berndt, Natasa Raicevic, A. N. Morozov, P. Baranov, M. Gregori, Peter Schleper, L. Lindfeld, T. J. Sloan, P.J.W. Faulkner, A.S. Belousov, Sergey Rusakov, P. Truöl, W. Yan, N. Loktionova, A. Hovhannisyan, I. Tsurin, R. Marshall, B. Stella, Ewelina Lobodzinska, Anna Kropivnitskaya, R. Felst, J. Gassner, F. Moreau, John A Coughlan, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), H1, and H1 Collaboration
Subjects: Quark, Particle physics, Photon, Physics and Astronomy (miscellaneous), Meson, High Energy Physics::Lattice, Nuclear Theory, FOS: Physical sciences, 01 natural sciences, Charm quark, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, Nuclear Experiment, Engineering (miscellaneous), Physics, 010308 nuclear & particles physics, Scattering, High Energy Physics::Phenomenology, HERA, Deep inelastic scattering, Pseudorapidity, High Energy Physics::Experiment
Abstract: Inclusive production cross sections are measured in deep inelastic scattering at HERA for meson states composed of a charm quark and a light antiquark or the charge conjugate. The measurements cover the kinematic region of photon virtuality 2 < Q 2 < 100 Gev2, inelasticity 0.05 < y < 0.7, D meson transverse momenta pt(D)≥2.5 Gev and pseudorapidity |η(D)|≤1.5. The identification of the D-meson decays and the reduction of the combinatorial background profit from the reconstruction of displaced secondary vertices by means of the H1 silicon vertex detector. The production of charmed mesons containing the light quarks u,d and s is found to be compatible with a description in which the hard scattering is followed by a factorisable and universal hadronisation process., The European Physical Journal C, 38 (4), ISSN:1434-6044, ISSN:1434-6052
Published: 2005

14. A Direct Search for Stable Magnetic Monopoles Produced in Positron-Proton Collisions at HERA

Author: A. Vest, O. Behrendt, S. Vinokurova, W. Yan, P. Kostka, N. Loktionova, A. Hovhannisyan, J. Turnau, Judith Katzy, I. Tsurin, A. Asmone, Y.H. Fleming, J. Scheins, W.D. Dau, J. B. Dainton, B. Leißner, I. Tsakov, Dusan Bruncko, B. Naroska, M.-O. Boenig, B. Wessling, I. Milcewicz-Mika, M. Jacquet, E. E. Elsen, T. Greenshaw, Erika Garutti, J. E. Olsson, W. Bartel, C. Wissing, J. Ferencei, M. Martisikova, J. Naumann, Malte Hildebrandt, Nicolas Berger, Georgios Tsipolitis, Claus Kleinwort, A. Baghdasaryan, A. Rostovtsev, Max Klein, C. Goyon, I. Sheviakov, S. Schmitt, M. Fleischer, F. Eisele, L. Finke, R. Plačakyte, F. W. Büsser, C. Risler, J. Zimmermann, M. Ismail, David Milstead, P. A. Smirnov, Thorsten Lux, L. Janauschek, N. Van Remortel, R. Oganezov, K. Sedlák, R. Koutouev, A. Petrukhin, V. Korbel, E. Lobodzinska, Bogdan Povh, C. Pascaud, I. R. Kenyon, J. Zálešák, V. Spaskov, A. Zhelezov, Paul Laycock, S. Baudrand, B. Stella, E. Malinovski, Adrian Perieanu, F. Sefkow, L. Lytkin, B. Vujicic, Cristinel Diaconu, C. Gwilliam, Gero Flucke, K. Daum, Natasa Raicevic, J. Kückens, K. Wacker, D. Utkin, Emmanuel Sauvan, Pierre Marage, G. Grindhammer, K. Müller, Christian Schwanenberger, B. Portheault, Vincent Boudry, Th. Naumann, Gerhard Brandt, E. Wünsch, P. Baranov, Sakar Osman, H. U. Martyn, M. Kapichine, M. Nozicka, A. M. Fomenko, I. Glushkov, J. Bähr, V. Volchinski, Dave Sankey, F. Tomasz, R. Demirchyan, L. Bystritskaya, G. Knies, C. Gerlich, Leif J. Jönsson, N. Werner, Benoit Roland, Xavier Janssen, V. Chekelian, Magnus Hansson, Alexandre Lebedev, C. Niebuhr, T. J. Sloan, P.J.W. Faulkner, A.S. Belousov, C. Wigmore, Sergey Rusakov, Wolfram Erdmann, P. Truöl, D.P. Brown, J. Haller, E. Gabathuler, C. Veelken, O. Behnke, V. Brisson, G. D. Patel, H. Meyer, C. Werner, T. Klimkovich, S. Egli, J. Cvach, M. Peez, A. N. Morozov, D. Perez-Astudillo, M. Gregori, H. Zohrabyan, V. Andreev, Daniel Pitzl, Katerina Lipka, D.P. Johnson, F. Cassol-Brunner, D. Traynor, Y. Soloviev, T. Laštovička, N. Malden, T. Kluge, L. Hajduk, F. P. Schilling, D. Meer, Stephen Maxfield, J. Wagner, E. Barrelet, S. Ghazaryan, C. Vallée, J. Stiewe, Z. Rurikova, M. Urban, Yves Sirois, N. Keller, Zhen Zhang, Ricardo Lopez-Fernandez, V. Tchoulakov, Andrew Mehta, J. Bracinik, E. A. De Wolf, Ch. Berger, S. Baumgartner, Anton Babaev, J. G. Contreras, G. Nowak, F. Salvaire, D. Haidt, Karel Cerny, K. H. Hiller, Guenter Eckerlin, André Schöning, N. Gogitidze, R. Roosen, L. Goerlich, Jan Kretzschmar, Dirk L. Hoffmann, J. C. Bizot, S. Schätzel, Christoph Grab, V. Lendermann, V. Schröder, R. C. W. Henderson, G. Franke, B. Delcourt, A. Mohamed, Laurent Schoeffel, J. Žáček, Eram Rizvi, S. Schmidt, Andreas Meyer, S. Caron, A. Usik, G. Heinzelmann, V. Dodonov, Y. Vazdik, I. Herynek, D. Lüke, M. Wessels, Hans-Christian Schultz-Coulon, M. Ellerbrock, A.-I. Lucaci-Timoce, Roland Horisberger, A. Valkárová, P. Prideaux, G. Herrera, Bradley Cox, V. Lubimov, Fabian Zomer, D.K. Nikitin, Stefania Xella, R. Wolf, Murrough Landon, Matthew Beckingham, G. Frising, A. Glazov, O. Henshaw, Paul Newman, J. V. Morris, R. Eichler, Anna Kropivnitskaya, R. Felst, S. Gorbounov, A. Bunyatyan, Matthias Ulrich Mozer, A. Fedotov, V. Jemanov, John A Coughlan, S. Ginzburgskaya, P. Van Mechelen, C. Kiesling, I. Foresti, G. Cozzika, A. De Roeck, E. Tzamariudaki, A. J. Campbell, R. D. Heuer, Pavel Murin, A. Specka, Martin Karlsson, A. Dubak, G. Weber, U. Straumann, M. Ibbotson, K. Krastev, L. Lindfeld, Stefan Valkar, C. Schmitz, Hannes Jung, Alexander Zhokin, J. Becker, K. Nankov, L. N. Shtarkov, B. List, A. Aktas, B. Olivier, G. Thompson, Laurent Favart, T. Anthonis, H. Henschel, S. Levonian, A. Nikiforov, David South, K. Krüger, R. Pöschl, R. Marshall, Klaus Desch, A. Rimmer, A. Knutsson, K. Meier, A. Makankine, G. Buschhorn, D. Ozerov, R. Weber, D. Wegener, V. Efremenko, S. Mikocki, P. E. Reimer, G. G. Winter, M. Goettlich, J. Formánek, A. D.R. Vargas Trevino, P. D. Thompson, V. Yeganov, S. Mangano, F. Moreau, S. J. Aplin, S. Essenov, E. Perez, R. Gerhards, Wolfgang Lange, J. Gayler, Peter Robmann, S. Backovic, H. Lueders, T. Frisson, I. Strauch, Philipp Fleischmann, J-P. Meyer, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), H1, Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), and H1 Collaboration
Subjects: Particle physics, Physics and Astronomy (miscellaneous), Proton, Magnetometer, Magnetic monopole, FOS: Physical sciences, 7. Clean energy, 01 natural sciences, law.invention, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Positron, law, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, Engineering (miscellaneous), Physics, Luminosity (scattering theory), 010308 nuclear & particles physics, HERA, 3. Good health, MoEDAL experiment, High Energy Physics::Experiment, Beam (structure)
Abstract: A direct search has been made for magnetic monopoles produced in e^+ p collisions at a centre of mass energy of 300 GeV at HERA. The beam pipe surrounding the interaction region in 1995-1997 was investigated using a SQUID magnetometer to look for stopped magnetic monopoles. During this time an integrated luminosity of 62 pb^{-1} was delivered. No magnetic monopoles were observed and charge and mass dependent upper limits on the e^+ p production cross section are set., 23 pages, 11 figures, 1 table
Published: 2005

15. Measurement of dijet production at low <tex>Q^{2}$</tex> at HERA

Author: Judith Katzy, D. Kant, I. Sheviakov, S. Schmitt, A. Asmone, Y.H. Fleming, Pierre Marage, N. Delerue, E. Wünsch, Anton Babaev, J. G. Contreras, Dave Sankey, V. Volchinski, R. Koutouev, A. Petrukhin, Paul Laycock, E. Malinovski, M. C. Cousinou, A. Vest, Emmanuel Sauvan, R. Demirchyan, V. Spaskov, C. Duprel, K. Daum, S. Caron, J. Zacek, Xavier Janssen, G. Grindhammer, J. Dingfelder, H. Spitzer, J. Kückens, G. D. Patel, K. Wacker, H. Meyer, K. Gabathuler, F. Tomasz, M. Winde, John A Coughlan, A. Dubak, A. Rostovtsev, O. Behrendt, N. Werner, D.P. Johnson, D. Wegener, S. Vinokurova, Peter Robmann, G. Knies, N. Malden, S. Lüders, D.K. Nikitin, O. Henshaw, T. Kuhr, V. Jemanov, P. Baranov, V. Lubimov, Caroline Collard, Peter Schleper, Y. Vazdik, J. Kroseberg, J. Kennedy, G. Thompson, H. U. Martyn, P. E. Reimer, J. V. Morris, O. Behnke, M.-O. Boenig, V. Chekelian, V. Brisson, S. Vassiliev, D. Lüke, V. Nagovizin, Rainer Stamen, N. Keller, G. Nowak, V. Efremenko, B. Koblitz, I. Milcewicz, E. E. Woehrling, T. Laštovička, D. South, A. Bunyatyan, V. Lendermann, V. Schröder, C. Wissing, R. Lemrani, B. List, A. Aktas, Daniel Pitzl, S. Mikocki, Zhen Zhang, Ricardo Lopez-Fernandez, E. Barrelet, Thorsten Lux, M. Peez, Murrough Landon, Nicolas Berger, Eckhard Elsen, L. N. Shtarkov, H. Henschel, B. Olivier, B. Reisert, S. Baumgartner, L. Janauschek, D. Traynor, F. Cassol-Brunner, S. Gorbounov, G. G. Winter, Z. Rurikova, Andreas Meyer, A. Usik, G. Frising, P. Höting, L. Hajduk, Leif J. Jönsson, Dusan Bruncko, K. H. Hiller, R. C. W. Henderson, M. Beckingham, S. Backovic, E. A. De Wolf, Ch. Berger, D.P. Brown, P. Kostka, J. Haller, Karlheinz Meier, R. Roosen, S. Michine, B. Leissner, J-P. Meyer, P. Van Mechelen, B. Naroska, Matthias Ulrich Mozer, J.C. Bizot, A. Fedotov, Fabian Zomer, Laurent Schoeffel, C. Risler, R. D. Heuer, S. Schmidt, H. Lueders, J. Turnau, J. E. Olsson, W. Bartel, J. Formánek, Günter Flügge, I. Herynek, B. Stella, T. Kluge, Klaus Desch, D. Haidt, I. Foresti, G. Cozzika, Michael Schneider, J. Chyla, T. Greenshaw, Wolfram Erdmann, T. J. Sloan, F. W. Büsser, W. Braunschweig, C. Kiesling, Eram Rizvi, Stefan Valkar, G. Heinzelmann, I. R. Kenyon, A. Specka, T. Berndt, Martin Erdmann, Natasa Raicevic, V. Dodonov, S. Levonian, Anna Kropivnitskaya, Vincent Boudry, R. Felst, A. Knutsson, A. N. Morozov, M. Hildebrandt, I. Morozov, A. De Roeck, M. Gregori, E. Tzamariudaki, A. J. Campbell, Y.R. Coppens, Jan Hladky, J. Ferencei, J. Rauschenberger, M. Martisikova, J. Naumann, L. Bystritskaya, S. Ghazaryan, H.-B. Bröker, Hannes Jung, Alexander Zhokin, A. D.R. Vargas Trevino, H. Zohrabyan, I. Strauch, J. Marks, P. D. Thompson, Philipp Fleischmann, F. Eisele, J. Becker, C. Vallée, A. Makankine, G. Buschhorn, Claus Kleinwort, L. Lytkin, R. Heremans, Wolfgang Lange, S. Mangano, D. Ozerov, R. Weber, F. Moreau, Cristinel Diaconu, Roland Horisberger, Marek Tasevsky, E. Perez, K. Sedlák, Georgios Tsipolitis, J. Gayler, A. Valkárová, Gero Flucke, M. Kapichine, R. Gerhards, M. Nozicka, M. Fleischer, Th. Naumann, B. Delcourt, Martin Karlsson, B. Portheault, S. Schätzel, S. D. Kolya, E. Gabathuler, C. Veelken, D. Meer, R. Pöschl, R. Marshall, E. Lobodzinska, Bogdan Povh, Paul Newman, F. Sefkow, B. Waugh, V. Grabski, G. Weber, U. Straumann, V. Andreev, J. Wagner, J. Böhme, Karel Cerny, J. Scheins, A. Uraev, M. Jacquet, C. Johnson, V. Korbel, W.D. Dau, J. B. Dainton, J. Garvey, Yves Sirois, Alexandre Lebedev, C. Werner, Dirk L. Hoffmann, P.J.W. Faulkner, A.S. Belousov, Sergey Rusakov, P. Truöl, A. M. Fomenko, J. D. Dowell, W. Yan, G. Franke, N. Loktionova, J. Gassner, A. Hovhannisyan, I. Tsurin, J. Zalesak, J. Martyniak, J. Bähr, C. Niebuhr, S. Egli, Y. Soloviev, F. P. Schilling, Max Klein, C. Gerlich, K. Rybicki, Christoph Grab, Hans-Christian Schultz-Coulon, A. Vichnevski, M. Ismail, David Milstead, P. A. Smirnov, R. Eichler, G. Ossoskov, M. Urban, C. Pascaud, Guenter Eckerlin, André Schöning, L. Goerlich, J. Cvach, B. Wessling, K. Müller, Christian Schwanenberger, Stephen Maxfield, J. Stiewe, Andrew Mehta, J. Bracinik, N. Gogitidze, M. Wessels, M. Ellerbrock, G. Herrera, Bradley Cox, Pavel Murin, H. Grässler, M. Ibbotson, Laurent Favart, T. Anthonis, Adrian Perieanu, and H1 Collaboration
Subjects: Quantum chromodynamics, Physics, Particle physics, Photon, Luminosity (scattering theory), Physics and Astronomy (miscellaneous), Monte Carlo method, Virtual particle, Parton, HERA, Jet (particle physics), Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous)
Abstract: Triple differential dijet cross sections in e±p interactions are presented in the region of photon virtualities 2 < Q 2 < 80 GeV2, inelasticities 0.1 < y < 0.85, jet transverse energies E * T 1 > 7 GeV, E * T 2 > 5 GeV, and pseudorapidities −2.5, The European Physical Journal C, 37 (2), ISSN:1434-6044, ISSN:1434-6052
Published: 2004

16. Inclusive dijet production at low Bjorken-x in deep inelastic scattering

Author: J. V. Morris, J.E. Turney, V. Andreev, P. Höting, M. C. Cousinou, K. Meier, M. Jacquet, Yves Sirois, A. Bunyatyan, Peter Schleper, Paul Newman, Dirk L. Hoffmann, J. C. Bizot, F. Eisele, M. zur Nedden, K. Sedlák, G. Franke, J. Žáček, Hans-Christian Schultz-Coulon, J. Kueckens, A. Vichnevski, I. Morozov, P. D. Thompson, P. E. Reimer, K. Gabathuler, G. Ossoskov, Paul Laycock, E. Malinovski, S. Levonian, A. B. Meyer, R. Eichler, A. Vest, S. Lüders, A. Makankine, G. Buschhorn, Emmanuel Sauvan, B. Wessling, G. Grindhammer, J. Dingfelder, D. Ozerov, R. Weber, L. Bystritskaya, P.J.W. Faulkner, Sergey Rusakov, N. Werner, T. Kuhr, Gero Flucke, M. Kapichine, M. Nozicka, B. Waugh, G. Weber, D. Wegener, R. Pöschl, U. Straumann, Y.R. Coppens, Laurent Schoeffel, S. Schmidt, D. Haidt, V. Efremenko, B. Koblitz, T. J. Sloan, Eram Rizvi, G. Heinzelmann, V. Dodonov, V. Korbel, Alexandre Lebedev, C. Werner, J. E. Olsson, F. W. Büsser, I. R. Kenyon, T. Berndt, Natasa Raicevic, Vincent Boudry, J. Scheins, C. Johnson, W.D. Dau, C. Risler, V. Volchinski, R. Demirchyan, D. Kant, Xavier Janssen, M. Beckingham, A. Fedotov, Günter Flügge, C. Kiesling, K. Müller, I. Sheviakov, S. Schmitt, Leif J. Jönsson, F. Tomasz, G. Knies, H. Spitzer, S. Mangano, F. Moreau, J. Hladký, S. D. Kolya, G. G. Winter, O. Behrendt, S. Vinokurova, R. Lemrani, P. Kostka, J. Turnau, C. Niebuhr, S. Egli, Y. Soloviev, F. P. Schilling, S. Schätzel, Wolfram Erdmann, J. G. Contreras, D.P. Brown, S. Ghazaryan, J. Wagner, C. Berger, V. Lubimov, Christian Schwanenberger, J. Rauschenberger, F. Keil, Wolfgang Lange, J. Gayler, K. H. Hiller, P. Truöl, R. C. W. Henderson, A. D.R. Vargas Trevino, A. N. Morozov, M. Gregori, J. Böhme, Martin Erdmann, F. Niebergall, A. J. Campbell, M.-O. Boenig, A. De Roeck, E. Tzamariudaki, B. Stella, V. Spaskov, Rainer Stamen, D. South, Anna Kropivnitskaya, E. Wünsch, Dave Sankey, N. Delerue, C. Pascaud, Guenter Eckerlin, André Schöning, L. Goerlich, L. N. Shtarkov, N. Keller, A. Uraev, R. Felst, Michael Schneider, A. Babaev, V. Jemanov, K. Rybicki, Christoph Grab, G. Nowak, S. Mikocki, M. Hildebrandt, V. Chekelian, V. Nagovizin, V. Lendermann, Pavel Murin, H. Grässler, E. E. Woehrling, V. Schröder, M. Ibbotson, G. D. Patel, H. Meyer, D.P. Johnson, Judith Katzy, Murrough Landon, A. Rostovtsev, Max Klein, N. Malden, C. Collard, A. Asmone, Y.H. Fleming, E. Perez, S. Gorbounov, J-P. Meyer, S. Caron, A. Specka, K. Daum, N. Loktionova, R. Marshall, C. Veelken, J. Gassner, M. Winde, P. Baranov, David Milstead, R. Gerhards, A. Hovhannisyan, P. A. Smirnov, A. Dubak, Dusan Bruncko, B. List, D. Meer, I. Tsurin, C. Duprel, A. Aktas, D.K. Nikitin, O. Henshaw, B. Reisert, J. Bähr, B. Naroska, W. Braunschweig, J. B. Dainton, S. Michine, J. Zalesak, P. Van Mechelen, B. Olivier, E. E. Elsen, C. Wissing, J. Garvey, T. Kluge, T. Greenshaw, J. Martyniak, G. Thompson, Y. Vazdik, H. U. Martyn, D. Lüke, M. Peez, Roland Horisberger, Laurent Favart, T. Anthonis, A. Valkárová, J. Ferencei, J. Naumann, L. Janauschek, J. Formánek, I. Strauch, J. Marks, Philipp Fleischmann, Claus Kleinwort, A. Belousov, Varlen Grabski, Th. Naumann, Peter Robmann, Zhen Zhang, Ricardo Lopez-Fernandez, J. Haller, Martin Karlsson, S. Baumgartner, Stephen Maxfield, J. Stiewe, A. M. Fomenko, E. Gabathuler, J. D. Dowell, J. A. Coughlan, A. Usik, K. Wacker, G. Frising, B. Delcourt, B. E. Cox, Andrew Mehta, J. Bracinik, S. Backovic, D. Clarke, H. Lueders, N. Gogitidze, H. Henschel, C. Gerlich, Fabian Zomer, M. Wessels, M. Ellerbrock, J. Kroseberg, I. Foresti, G. Herrera, G. Cozzika, Stefan Valkar, H.-B. Bröker, Hannes Jung, Alexander Zhokin, J. Becker, C. Vallée, R. Heremans, W. Bartel, Georgios Tsipolitis, M. Fleischer, E. Lobodzinska, Bogdan Povh, F. Sefkow, B. Leibner, R. Koutouev, A. Petrukhin, J. Cvach, J. Kennedy, V. Brisson, S. Vassiliev, T. Laštovička, E. Barrelet, E. A. De Wolf, R. Roosen, I. Herynek, Pierre Marage, O. Behnke, L. Lytkin, Cristinel Diaconu, Daniel Pitzl, D. Traynor, F. Cassol-Brunner, L. Hajduk, M. Urban, Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, H1 Collaboration, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Damoiseaux, Magali
Subjects: Physics, Particle physics, Photon, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics and Astronomy (miscellaneous), Scattering, FOS: Physical sciences, Perturbative QCD, Virtual particle, Parton, Deep inelastic scattering, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Factorization, Phase space, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Engineering (miscellaneous)
Abstract: Dijet production in deep inelastic ep scattering is investigated in the region of low values of the Bjorken-variable x (10-4 < x < 10-2) and low photon virtualities Q 2 (5 < Q 2 < 100 GeV2). The measured dijet cross sections are compared with perturbative QCD calculations in next-to-leading order. For most dijet variables studied, these calculations can provide a reasonable description of the data over the full phase space region covered, including the region of very low x. However, large discrepancies at low x and low Q 2 are observed for events with small separation in azimuth between the two highest transverse momentum jets. This region of phase space is described better by predictions based on the CCFM evolution equation, which incorporates k t factorized unintegrated parton distributions. A reasonable description can be also obtained using the Color Dipole Model or models incorporating virtual photon structure., The European Physical Journal C, 33 (4), ISSN:1434-6044, ISSN:1434-6052
Published: 2004
Full Text: View/download PDF

17. Measurement of anti-deuteron photoproduction and a search for heavy stable charged particles at HERA

Author: K. Gabathuler, D. Wegener, V. Boudry, Caroline Collard, F. Moreau, S. Levonian, A. B. Meyer, J. V. Morris, V. Efremenko, B. Koblitz, Y.R. Coppens, A. Vest, O. Behrendt, S. Vinokurova, R. Lemrani, P. Kostka, I. Sheviakov, S. Schmitt, Gero Flucke, S. Mikocki, H. Spitzer, J. Turnau, M. Kapichine, M. Nozicka, M. Schneider, A. Bunyatyan, John A Coughlan, David South, R. Koutouev, A. Petrukhin, J. Zálešák, B. Delcourt, V. Spaskov, Anna Kropivnitskaya, R. Felst, K. Meier, J. Kückens, S. Schätzel, V. Korbel, K. H. Hiller, R. C. W. Henderson, Peter Robmann, J. Cvach, Murrough Landon, V. Chekelian, V. Lubimov, J. Garvey, V. Nagovizin, Roland Horisberger, A. Valkárová, J. Kennedy, B. Wessling, V. Brisson, S. Gorbounov, P. Höting, B. Stella, E. E. Woehrling, A. M. Fomenko, C. Veelken, Martin Karlsson, D. Meer, L. N. Shtarkov, G. Thompson, C. Gerlich, T. Laštovička, J. Scheins, A. Makankine, P. E. Reimer, Judith Katzy, Leif J. Jönsson, G. Buschhorn, A. Asmone, D. Ozerov, Laurent Schoeffel, P. Van Mechelen, Wolfram Erdmann, R. D. Heuer, S. Schmidt, E. Barrelet, Z. Rurikova, J. E. Olsson, Benoit Roland, G. Ossoskov, W.D. Dau, J. B. Dainton, Dusan Bruncko, R. Weber, T. Klimkovich, W. Yan, Z. Ratiani, B. Naroska, E. Wünsch, H. Henschel, G. G. Winter, J.C. Bizot, B. Leißner, Magnus Hansson, Y.H. Fleming, Alexandre Lebedev, Fabian Zomer, W. Bartel, E. A. De Wolf, Ch. Berger, R. Roosen, N. Loktionova, N. Keller, Dave Sankey, S. Backovic, T. Kluge, T. Greenshaw, Erika Garutti, Anton Babaev, C. Werner, K. Daum, B. Portheault, J. Ferencei, M. Martisikova, J. Naumann, F. Tomasz, G. Knies, I. Herynek, J. G. Contreras, A. Mohamed, C. Pascaud, J. Marks, G. D. Patel, I. Foresti, G. Cozzika, A. Hovhannisyan, G. Nowak, V. Lendermann, V. Schröder, H. Lueders, I. Tsurin, Paul Laycock, E. Malinovski, J. Formánek, Guenter Eckerlin, Claus Kleinwort, André Schöning, C. Duprel, Max Klein, S. Ghazaryan, H. Meyer, D.P. Johnson, Stefan Valkar, N. Malden, L. Goerlich, P. D. Thompson, V. Yeganov, R. Plačakyte, Malte Hildebrandt, Rainer Stamen, Emmanuel Sauvan, G. Grindhammer, J. Dingfelder, M. Ismail, David Milstead, J. Kroseberg, Paul Newman, P. A. Smirnov, H.-B. Bröker, Hannes Jung, A. D.R. Vargas Trevino, Alexander Zhokin, N. Werner, T. Kuhr, S. Mangano, P. Baranov, Wolfgang Lange, C. Vallée, J. Gayler, J. Becker, R. Heremans, A. Nikiforov, Peter Schleper, D. Haidt, E. Perez, H. U. Martyn, I. Morozov, R. Gerhards, Georgios Tsipolitis, M. Fleischer, Eram Rizvi, Pavel Murin, H. Grässler, F. W. Büsser, T. J. Sloan, P.J.W. Faulkner, A.S. Belousov, M. Ibbotson, Sergey Rusakov, P. Truöl, L. Bystritskaya, K. Müller, Christian Schwanenberger, G. Heinzelmann, V. Dodonov, R. Pöschl, G. Weber, U. Straumann, S. Caron, E. Lobodzinska, Bogdan Povh, R. Marshall, F. Sefkow, Laurent Favart, T. Anthonis, H. Zohrabyan, E. E. Elsen, D.K. Nikitin, O. Henshaw, C. Niebuhr, I. R. Kenyon, C. Wissing, T. Berndt, S. Egli, F. Cassol-Brunner, Natasa Raicevic, Thorsten Lux, L. Janauschek, N. Van Remortel, D.P. Brown, J. Haller, Klaus Desch, S. Michine, I. Strauch, Philipp Fleischmann, Stephen Maxfield, J. Stiewe, Y. Soloviev, C. Risler, A. Specka, A. Rimmer, J. Wagner, J. Böhme, F. P. Schilling, Karel Cerny, Andrew Mehta, J. Bracinik, A. Knutsson, N. Gogitidze, A. Uraev, K. Rybicki, Martin Erdmann, C. Gwilliam, M. Wessels, M. Ellerbrock, Christoph Grab, G. Herrera, Bradley Cox, R. Wolf, A. N. Morozov, A. Rostovtsev, M. Gregori, F. Eisele, R. Oganezov, K. Sedlák, D. Utkin, I. Milcewicz, B. Reisert, J. Bähr, Zhen Zhang, Ricardo Lopez-Fernandez, S. Baumgartner, V. Andreev, A. Usik, G. Frising, M. Jacquet, Yves Sirois, Dirk L. Hoffmann, G. Franke, J. Žáček, Hans-Christian Schultz-Coulon, L. Lindfeld, R. Eichler, D. Kant, Katerina Lipka, V. Tchoulakov, Adrian Perieanu, V. Volchinski, V. Jemanov, R. Demirchyan, B. List, A. Aktas, B. Olivier, Xavier Janssen, J-P. Meyer, M.-O. Boenig, Nicolas Berger, M. Beckingham, Matthias Ulrich Mozer, A. Fedotov, Günter Flügge, C. Kiesling, A. De Roeck, E. Tzamariudaki, A. J. Campbell, Pierre Marage, A. Dubak, Y. Vazdik, D. Lüke, M. Peez, Stefania Xella, O. Behnke, Th. Naumann, E. Gabathuler, K. Wacker, L. Lytkin, Cristinel Diaconu, Daniel Pitzl, D. Traynor, L. Hajduk, M. Urban, H1 Collaboration, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), and H1
Subjects: Physics, Particle physics, Large Hadron Collider, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Nuclear Theory, FOS: Physical sciences, Elementary particle, HERA, 01 natural sciences, Charged particle, 3. Good health, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Deuterium, 0103 physical sciences, Transverse momentum, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Rapidity, High Energy Physics::Experiment, 010306 general physics, Nuclear Experiment, Engineering (miscellaneous)
Abstract: The cross section for anti-deuteron photoproduction is measured at HERA at a mean centre-of-mass energy of Wγp=200 GeV in the range 0.2 < p T /M < 0.7 and |y| < 0.4, where M, p T and y are the mass, transverse momentum and rapidity of the anti-deuteron in the HERA laboratory frame, respectively. The numbers of anti-deuterons per event are found to be similar in photoproduction to those in central proton-proton collisions at the CERN ISR but much lower than those in central Au-Au collisions at RHIC. The coalescence parameter B 2, which characterizes the likelihood of anti-deuteron production, is measured in photoproduction to be 0.010±0.002±0.001, which is much higher than in Au-Au collisions at a similar nucleon-nucleon centre-of-mass energy. No significant production of particles heavier than deuterons is observed and upper limits are set on the photoproduction cross sections for such particles., The European Physical Journal C, 36 (4), ISSN:1434-6044, ISSN:1434-6052
Published: 2004

18. Evidence for a narrow anti-charmed baryon state

Author: V. Yeganov, I. Sheviakov, S. Schmitt, F. Moreau, L. Lytkin, S. Levonian, A. B. Meyer, Cristinel Diaconu, J. Zálešák, P. E. Reimer, V. Spaskov, G. G. Winter, J. Kückens, I. Morozov, R. Plačakyt, T. Laštovička, A. Lebedev, K. Daum, David South, M.-O. Boenig, S. Mangano, Stephen Maxfield, L. Bystritskaya, L. Lindfeld, E. Barrelet, Daniel Pitzl, F. Tomasz, G. Knies, O. Henshaw, D. Traynor, J. Žáček, D. Haidt, T. J. Sloan, Eram Rizvi, Dusan Bruncko, Hans-Christian Schultz-Coulon, H. Zohrabyan, Z. Rurikova, R. Eichler, A. Asmone, B. Naroska, E.-E. Woehrling, G. Heinzelmann, V. Dodonov, M. Hildebrandt, J. Stiewe, B. Stella, A. Vest, F. Cassol-Brunner, V. Lubimov, L. Hajduk, Nicolas Berger, I. Milcewicz, T. Kluge, E. A. De Wolf, Ch. Berger, T. Greenshaw, O. Behrendt, Gero Flucke, R. Roosen, M. Kapichine, M. Nozicka, Erika Garutti, M. Urban, S. Vinokurova, S. Caron, Ewelina Lobodzinska, B. Delcourt, R. Lemrani, Anton Babaev, P. Kostka, J. Ferencei, M. Martisikova, J. Naumann, Z. Ratiani, N. Keller, J. Marks, V. Lendermann, Paul Laycock, E. Malinovski, Emmanuel Sauvan, A. Nikiforov, J. G. Contreras, A. Mohamed, Th. Naumann, Y. R. Coppens, Pierre Marage, J. Turnau, Rainer Stamen, V. Schröder, D. Lüke, E. Wünsch, Dave Sankey, G. Grindhammer, S. Schätzel, D.K. Nikitin, I. Herynek, L. N. Shtarkov, Pavel Murin, H. Grässler, M. Ibbotson, Anna Kropivnitskaya, R. Felst, V. Jemanov, Zhen Zhang, Ricardo Lopez-Fernandez, S. Baumgartner, D. Hoffmann, D. Meer, A. Usik, G. Frising, R. Weber, J. E. Olsson, W. Bartel, F. W. Büsser, Judith Katzy, J. Dingfelder, N. Werner, G. D. Patel, D.P. Johnson, N. Malden, C. Wissing, Andrew Mehta, J. Bracinik, J-P. Meyer, T. Berndt, Natasa Raicevic, Y.H. Fleming, Magnus Hansson, E. Gabathuler, K. Wacker, A. Schöning, A. Rostovtsev, J. V. Morris, S. Michine, P. Baranov, J. Formánek, Peter Schleper, P.J.W. Faulkner, A.S. Belousov, Sergey Rusakov, P. Truöl, B. Portheault, A. D.R. Vargas Trevino, E. E. Elsen, E. Perez, R. Gerhards, Thorsten Lux, L. Goerlich, L. Janauschek, N. Van Remortel, P. Höting, N. Gogitidze, R. Pöschl, R. Marshall, M. Wessels, M. Ellerbrock, G. Herrera, Bradley Cox, R. Wolf, C. Duprel, Vincent Boudry, H. U. Martyn, A. N. Morozov, M. Gregori, A. Aktas, I. Strauch, Philipp Fleischmann, B. Olivier, Laurent Schoeffel, Murrough Landon, S. Gorbounov, O. Behnke, T. Kuhr, D. Utkin, B. Reisert, Wolfram Erdmann, B. List, Paul Richard Newman, Grzegorz Nowak, Adrian Perieanu, K. Gabathuler, Peter Robmann, J. Kroseberg, Klaus Desch, Laurent Favart, T. Anthonis, I. Foresti, G. Cozzika, Stefan Valkar, H.-B. Bröker, Hannes Jung, Alexander Zhokin, J. Becker, C. Vallée, Roland Horisberger, A. Valkárová, J. Bähr, A. Bunyatyan, C. Niebuhr, M. Beckingham, D.P. Brown, J. Haller, V. Volchinski, H. Meyer, R. Demirchyan, Martin Karlsson, R. Koutouev, A. Petrukhin, S. Schmidt, Matthias Ulrich Mozer, P. Van Mechelen, A. Fedotov, Xavier Janssen, S. Ghazaryan, R. Heremans, Günter Flügge, A. Rimmer, R. D. Heuer, D. Wegener, Caroline Collard, C. Risler, S. Egli, John A Coughlan, W. Yan, Georgios Tsipolitis, M. Fleischer, C. Kiesling, A. Knutsson, K. Meier, N. Loktionova, A. Hovhannisyan, A. De Roeck, E. Tzamariudaki, A. J. Campbell, Y. Soloviev, S. Backovic, Bogdan Povh, F. Sefkow, B. Wessling, I. Tsurin, K. H. Hiller, A. Makankine, G. Buschhorn, Martin Erdmann, J. Garvey, R. C. W. Henderson, C. Gwilliam, A. M. Fomenko, G. Thompson, H. Lueders, C. Gerlich, D. Kant, C. Veelken, V. Efremenko, Wolfgang Lange, G. Ossoskov, D. Ozerov, B. Koblitz, Claus Kleinwort, A. Specka, J. Gayler, A. Dubak, F. P. Schilling, C. Pascaud, Guenter Eckerlin, Y. Vazdik, P.D. Thompson, M. Schneider, Stefania Xella, K. Rybicki, V. Chekelian, V. Nagovizin, Leif J. Jönsson, S. Mikocki, Benoit Roland, Christoph Grab, Katerina Lipka, H. Henschel, J.C. Bizot, J. Cvach, V. Korbel, T. Klimkovich, V. Tchoulakov, M. Peez, J. Kennedy, V. Brisson, C. Werner, I. R. Kenyon, H. Spitzer, G. Weber, U. Straumann, J. Wagner, J. Böhme, Karel Cerny, A. Uraev, A. Glazov, Max Klein, M. Ismail, David Milstead, F. Zomer, V. Andreev, P. A. Smirnov, Yves Sirois, G. Franke, M. Jacquet, F. Eisele, R. Oganezov, K. Sedlák, J. Scheins, W.D. Dau, J. B. Dainton, B. Leißner, K. Müller, Christian Schwanenberger, Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, Starita, Sabine, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and H1 Collaboration
Subjects: Nuclear and High Energy Physics, Particle physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Theory, FOS: Physical sciences, Constituent quark, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Invariant mass, 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Resonance, Charge (physics), HERA, Pentaquark, Baryon, High Energy Physics - Phenomenology, High Energy Physics::Experiment, Bar (unit)
Abstract: A narrow resonance in D*- p and D*+ pbar invariant mass combinations is observed in inelastic electron-proton collisions at centre-of-mass energies of 300 GeV and 320 GeV at HERA. The resonance has a mass of 3099 \pm 3 (stat.) \pm 5 (syst.) MeV and a measured Gaussian width of 12 \pm 3 (stat.) MeV, compatible with the experimental resolution. The resonance is interpreted as an anti-charmed baryon with a minimal constituent quark composition of uuddcbar, together with the charge conjugate., 20 pages, 7 figures and 2 tables
Published: 2004

19. Diffractive Photoproduction of J/psi Mesons with Large Momentum Transfer at HERA

Author: A. Aktas, V. Andreev, T. Anthonis, A. Astvatsatourov, A. Babaev, S. Backovic, J. Bähr, P. Baranov, E. Barrelet, W. Bartel, S. Baumgartner, J. Becker, M. Beckingham, A. Beglarian, O. Behnke, O. Behrendt, A. Belousov, Ch. Berger, T. Berndt, J.C. Bizot, J. Böhme, M.-O. Boenig, V. Boudry, J. Bracinik, W. Braunschweig, V. Brisson, H.-B. Bröker, D.P. Brown, D. Bruncko, F.W. Büsser, A. Bunyatyan, A. Burrage, G. Buschhorn, L. Bystritskaya, A.J. Campbell, S. Caron, F. Cassol-Brunner, V. Chekelian, D. Clarke, C. Collard, J.G. Contreras, Y.R. Coppens, J.A. Coughlan, M.-C. Cousinou, B.E. Cox, G. Cozzika, J. Cvach, J.B. Dainton, W.D. Dau, K. Daum, M. Davidsson, B. Delcourt, N. Delerue, R. Demirchyan, A. De Roeck, E.A. De Wolf, C. Diaconu, J. Dingfelder, P. Dixon, V. Dodonov, J.D. Dowell, A. Dubak, C. Duprel, G. Eckerlin, V. Efremenko, S. Egli, R. Eichler, F. Eisele, M. Ellerbrock, E. Elsen, M. Erdmann, W. Erdmann, P.J.W. Faulkner, L. Favart, A. Fedotov, R. Felst, J. Ferencei, S. Ferron, M. Fleischer, P. Fleischmann, Y.H. Fleming, G. Flucke, G. Flügge, A. Fomenko, I. Foresti, J. Formánek, G. Franke, G. Frising, E. Gabathuler, K. Gabathuler, J. Garvey, J. Gassner, J. Gayler, R. Gerhards, C. Gerlich, S. Ghazaryan, L. Goerlich, N. Gogitidze, S. Gorbounov, C. Grab, V. Grabski, H. Grässler, T. Greenshaw, G. Grindhammer, D. Haidt, L. Hajduk, J. Haller, B. Heinemann, G. Heinzelmann, R.C.W. Henderson, H. Henschel, O. Henshaw, R. Heremans, G. Herrera, I. Herynek, M. Hildebrandt, M. Hilgers, K.H. Hiller, J. Hladký, P. Höting, D. Hoffmann, R. Horisberger, A. Hovhannisyan, M. Ibbotson, M. Jacquet, L. Janauschek, X. Janssen, V. Jemanov, L. Jönsson, C. Johnson, D.P. Johnson, M.A.S. Jones, H. Jung, D. Kant, M. Kapichine, M. Karlsson, J. Katzy, F. Keil, N. Keller, J. Kennedy, I.R. Kenyon, C. Kiesling, M. Klein, C. Kleinwort, T. Kluge, G. Knies, B. Koblitz, S.D. Kolya, V. Korbel, P. Kostka, R. Koutouev, A. Koutov, J. Kroseberg, K. Krüger, J. Kueckens, T. Kuhr, M.P.J. Landon, W. Lange, T. Laštovička, P. Laycock, A. Lebedev, B. Leißner, R. Lemrani, V. Lendermann, S. Levonian, B. List, E. Lobodzinska, N. Loktionova, R. Lopez-Fernandez, V. Lubimov, H. Lueders, S. Lüders, D. Lüke, L. Lytkin, A. Makankine, N. Malden, E. Malinovski, S. Mangano, P. Marage, J. Marks, R. Marshall, H.-U. Martyn, J. Martyniak, S.J. Maxfield, D. Meer, A. Mehta, K. Meier, A.B. Meyer, H. Meyer, J. Meyer, S. Michine, S. Mikocki, D. Milstead, S. Mohrdieck, F. Moreau, A. Morozov, J.V. Morris, K. Müller, P. Murı́n, V. Nagovizin, B. Naroska, J. Naumann, Th. Naumann, P.R. Newman, F. Niebergall, C. Niebuhr, D. Nikitin, G. Nowak, M. Nozicka, B. Olivier, J.E. Olsson, D. Ozerov, V. Panassik, C. Pascaud, G.D. Patel, M. Peez, E. Perez, A. Petrukhin, J.P. Phillips, D. Pitzl, R. Pöschl, B. Povh, N. Raicevic, J. Rauschenberger, P. Reimer, B. Reisert, C. Risler, E. Rizvi, P. Robmann, R. Roosen, A. Rostovtsev, S. Rusakov, K. Rybicki, D.P.C. Sankey, E. Sauvan, S. Schätzel, J. Scheins, F.-P. Schilling, P. Schleper, D. Schmidt, S. Schmidt, S. Schmitt, M. Schneider, L. Schoeffel, A. Schöning, V. Schröder, H.-C. Schultz-Coulon, C. Schwanenberger, K. Sedlák, F. Sefkow, I. Sheviakov, L.N. Shtarkov, Y. Sirois, T. Sloan, P. Smirnov, Y. Soloviev, D. South, V. Spaskov, A. Specka, H. Spitzer, R. Stamen, B. Stella, J. Stiewe, I. Strauch, U. Straumann, G. Thompson, P.D. Thompson, F. Tomasz, D. Traynor, P. Truöl, G. Tsipolitis, I. Tsurin, J. Turnau, J.E. Turney, E. Tzamariudaki, A. Uraev, M. Urban, A. Usik, S. Valkár, A. Valkárová, C. Vallée, P. Van Mechelen, A. Vargas Trevino, S. Vassiliev, Y. Vazdik, C. Veelken, A. Vest, A. Vichnevski, V. Volchinski, K. Wacker, J. Wagner, R. Wallny, B. Waugh, G. Weber, R. Weber, D. Wegener, C. Werner, N. Werner, M. Wessels, B. Wessling, M. Winde, G.-G. Winter, Ch. Wissing, E.-E. Woehrling, E. Wünsch, A.C. Wyatt, J. Žáček, J. Zálešák, Z. Zhang, A. Zhokin, F. Zomer, M. zur Nedden, and H1 Collaboration
Subjects: Nuclear and High Energy Physics, High Energy Physics - Experiment (hep-ex), Physique des particules élémentaires, FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment, High Energy Physics - Experiment
Abstract: The diffractive photoproduction of J/ψ mesons is measured with the H1 detector at the ep collider HERA using an integrated luminosity of 78 pb -1. The differential cross section dσ(γp → J/ψY)/dt is studied in the range 2 < t < 30 GeV2, where t is the square of the four-momentum transferred at the proton vertex. The cross section is also presented as a function of the photon-proton centre-of-mass energy Wγp in three t intervals, spanning the range 50 < Wγp < 200 GeV. A fast rise of the cross section with Wγp is observed for each t range and the slope for the effective linear Pomeron trajectory is measured to be α′ = -0.0135 ± 0.0074(stat.) ± 0.0051(syst.) GeV-2. The measurements are compared with perturbative QCD models based on BFKL and DGLAP evolution. The data are found to be compatible with s-channel helicity conservation. © 2003 Published by Elsevier B.V., 0, DESY-03-061 / hep-ex/0306013, H1 Collaboration., info:eu-repo/semantics/published
Published: 2003

20. Search for excited electrons at HERA

Author: C. Adloff, V. Andreev, B. Andrieu, T. Anthonis, A. Astvatsatourov, A. Babaev, J. Bähr, P. Baranov, E. Barrelet, W. Bartel, S. Baumgartner, J. Becker, M. Beckingham, A. Beglarian, O. Behnke, A. Belousov, Ch. Berger, T. Berndt, J.C. Bizot, J. Böhme, V. Boudry, W. Braunschweig, V. Brisson, H.-B. Bröker, D.P. Brown, D. Bruncko, F.W. Büsser, A. Bunyatyan, A. Burrage, G. Buschhorn, L. Bystritskaya, A.J. Campbell, S. Caron, F. Cassol-Brunner, D. Clarke, C. Collard, J.G. Contreras, Y.R. Coppens, J.A. Coughlan, M.-C. Cousinou, B.E. Cox, G. Cozzika, J. Cvach, J.B. Dainton, W.D. Dau, K. Daum, M. Davidsson, B. Delcourt, N. Delerue, R. Demirchyan, A. De Roeck, E.A. De Wolf, C. Diaconu, J. Dingfelder, P. Dixon, V. Dodonov, J.D. Dowell, A. Droutskoi, A. Dubak, C. Duprel, G. Eckerlin, D. Eckstein, V. Efremenko, S. Egli, R. Eichler, F. Eisele, E. Eisenhandler, M. Ellerbrock, E. Elsen, M. Erdmann, W. Erdmann, P.J.W. Faulkner, L. Favart, A. Fedotov, R. Felst, J. Ferencei, S. Ferron, M. Fleischer, P. Fleischmann, Y.H. Fleming, G. Flügge, A. Fomenko, I. Foresti, J. Formánek, G. Franke, G. Frising, E. Gabathuler, K. Gabathuler, J. Garvey, J. Gassner, J. Gayler, R. Gerhards, C. Gerlich, S. Ghazaryan, L. Goerlich, N. Gogitidze, C. Grab, V. Grabski, H. Grässler, T. Greenshaw, G. Grindhammer, T. Hadig, D. Haidt, L. Hajduk, J. Haller, B. Heinemann, G. Heinzelmann, R.C.W. Henderson, S. Hengstmann, H. Henschel, R. Heremans, G. Herrera, I. Herynek, M. Hildebrandt, M. Hilgers, K.H. Hiller, J. Hladký, P. Höting, D. Hoffmann, R. Horisberger, A. Hovhannisyan, S. Hurling, M. Ibbotson, Ç. İşsever, M. Jacquet, M. Jaffre, L. Janauschek, X. Janssen, V. Jemanov, L. Jönsson, C. Johnson, D.P. Johnson, M.A.S. Jones, H. Jung, D. Kant, M. Kapichine, M. Karlsson, O. Karschnick, J. Katzy, F. Keil, N. Keller, J. Kennedy, I.R. Kenyon, C. Kiesling, P. Kjellberg, M. Klein, C. Kleinwort, T. Kluge, G. Knies, B. Koblitz, S.D. Kolya, V. Korbel, P. Kostka, S.K. Kotelnikov, R. Koutouev, A. Koutov, J. Kroseberg, K. Krüger, T. Kuhr, D. Lamb, M.P.J. Landon, W. Lange, T. Laštovička, P. Laycock, E. Lebailly, A. Lebedev, B. Leißner, R. Lemrani, V. Lendermann, S. Levonian, B. List, E. Lobodzinska, B. Lobodzinski, A. Loginov, N. Loktionova, V. Lubimov, S. Lüders, D. Lüke, L. Lytkin, N. Malden, E. Malinovski, S. Mangano, R. Maraček, P. Marage, J. Marks, R. Marshall, H.-U. Martyn, J. Martyniak, S.J. Maxfield, D. Meer, A. Mehta, K. Meier, A.B. Meyer, H. Meyer, J. Meyer, S. Michine, S. Mikocki, D. Milstead, S. Mohrdieck, M.N. Mondragon, F. Moreau, A. Morozov, J.V. Morris, K. Müller, P. Murı́n, V. Nagovizin, B. Naroska, J. Naumann, Th. Naumann, P.R. Newman, F. Niebergall, C. Niebuhr, O. Nix, G. Nowak, M. Nozicka, B. Olivier, J.E. Olsson, D. Ozerov, V. Panassik, C. Pascaud, G.D. Patel, M. Peez, E. Perez, A. Petrukhin, J.P. Phillips, D. Pitzl, R. Pöschl, I. Potachnikova, B. Povh, J. Rauschenberger, P. Reimer, B. Reisert, C. Risler, E. Rizvi, P. Robmann, R. Roosen, A. Rostovtsev, S. Rusakov, K. Rybicki, D.P.C. Sankey, S. Schätzel, J. Scheins, F.-P. Schilling, P. Schleper, D. Schmidt, S. Schmidt, S. Schmitt, M. Schneider, L. Schoeffel, A. Schöning, T. Schörner, V. Schröder, H.-C. Schultz-Coulon, C. Schwanenberger, K. Sedlák, F. Sefkow, V. Shekelyan, I. Sheviakov, L.N. Shtarkov, Y. Sirois, T. Sloan, P. Smirnov, Y. Soloviev, D. South, V. Spaskov, A. Specka, H. Spitzer, R. Stamen, B. Stella, J. Stiewe, I. Strauch, U. Straumann, S. Tchetchelnitski, G. Thompson, P.D. Thompson, F. Tomasz, D. Traynor, P. Truöl, G. Tsipolitis, I. Tsurin, J. Turnau, J.E. Turney, E. Tzamariudaki, A. Uraev, M. Urban, A. Usik, S. Valkár, A. Valkárová, C. Vallée, P. Van Mechelen, A. Vargas Trevino, S. Vassiliev, Y. Vazdik, C. Veelken, A. Vest, A. Vichnevski, K. Wacker, J. Wagner, R. Wallny, B. Waugh, G. Weber, D. Wegener, C. Werner, N. Werner, M. Wessels, G. White, S. Wiesand, T. Wilksen, M. Winde, G.-G. Winter, Ch. Wissing, M. Wobisch, E.-E. Woehrling, E. Wünsch, A.C. Wyatt, J. Žáček, J. Zálešák, Z. Zhang, A. Zhokin, F. Zomer, M. zur Nedden, Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, H1 Collaboration, Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Physics, Particle physics, Nuclear and High Energy Physics, Luminosity (scattering theory), 010308 nuclear & particles physics, Detector, Electroweak interaction, FOS: Physical sciences, HERA, Lambda, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Excited state, 0103 physical sciences, Physique des particules élémentaires, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, 010306 general physics
Abstract: A search for excited electron (e*) production is described in which the electroweak decays e* → eγ, e* → eZ and e* → v W are considered. The data used correspond to an integrated luminosity of 120 pb -1 taken in e ±p collisions from 1994 to 2000 with the H1 detector at HERA at centre-of-mass energies of 300 and 318 GeV. No evidence for a signal is found. Mass dependent exclusion limits are derived for the ratio of the couplings to the compositeness scale, f/Λ. These limits extend the excluded region to higher masses than has been possible in previous direct searches for excited electrons. © 2002 Published by Elsevier Science B.V., 0, DESY-02-096 /hep-ex/0207038, H1 Collaboration., info:eu-repo/semantics/published
Published: 2002

21. Measurement of Inclusive Jet Cross-Sections in Deep-Inelastic ep Scattering at HERA

Author: C. Adloff, V. Andreev, B. Andrieu, T. Anthonis, A. Astvatsatourov, A. Babaev, J. Bähr, P. Baranov, E. Barrelet, W. Bartel, S. Baumgartner, J. Becker, M. Beckingham, A. Beglarian, O. Behnke, C. Beier, A. Belousov, Ch. Berger, T. Berndt, J.C. Bizot, J. Böhme, V. Boudry, W. Braunschweig, V. Brisson, H.-B. Bröker, D.P. Brown, W. Brückner, D. Bruncko, F.W. Büsser, A. Bunyatyan, A. Burrage, G. Buschhorn, L. Bystritskaya, A.J. Campbell, T. Carli, S. Caron, F. Cassol-Brunner, D. Clarke, C. Collard, J.G. Contreras, Y.R. Coppens, J.A. Coughlan, M.-C. Cousinou, B.E. Cox, G. Cozzika, J. Cvach, J.B. Dainton, W.D. Dau, K. Daum, M. Davidsson, B. Delcourt, N. Delerue, R. Demirchyan, A. De Roeck, E.A. De Wolf, C. Diaconu, J. Dingfelder, P. Dixon, V. Dodonov, J.D. Dowell, A. Droutskoi, A. Dubak, C. Duprel, G. Eckerlin, D. Eckstein, V. Efremenko, S. Egli, R. Eichler, F. Eisele, E. Eisenhandler, M. Ellerbrock, E. Elsen, M. Erdmann, W. Erdmann, P.J.W. Faulkner, L. Favart, A. Fedotov, R. Felst, J. Ferencei, S. Ferron, M. Fleischer, P. Fleischmann, Y.H. Fleming, G. Flügge, A. Fomenko, I. Foresti, J. Formánek, G. Franke, G. Frising, E. Gabathuler, K. Gabathuler, J. Garvey, J. Gassner, J. Gayler, R. Gerhards, C. Gerlich, S. Ghazaryan, L. Goerlich, N. Gogitidze, C. Grab, V. Grabski, H. Grässler, T. Greenshaw, G. Grindhammer, T. Hadig, D. Haidt, L. Hajduk, J. Haller, W.J. Haynes, B. Heinemann, G. Heinzelmann, R.C.W. Henderson, S. Hengstmann, H. Henschel, R. Heremans, G. Herrera, I. Herynek, M. Hildebrandt, M. Hilgers, K.H. Hiller, J. Hladký, P. Höting, D. Hoffmann, R. Horisberger, A. Hovhannisyan, S. Hurling, M. Ibbotson, Ç. İşsever, M. Jacquet, M. Jaffre, L. Janauschek, X. Janssen, V. Jemanov, L. Jönsson, C. Johnson, D.P. Johnson, M.A.S. Jones, H. Jung, D. Kant, M. Kapichine, M. Karlsson, O. Karschnick, F. Keil, N. Keller, J. Kennedy, I.R. Kenyon, S. Kermiche, C. Kiesling, P. Kjellberg, M. Klein, C. Kleinwort, T. Kluge, G. Knies, B. Koblitz, S.D. Kolya, V. Korbel, P. Kostka, S.K. Kotelnikov, R. Koutouev, A. Koutov, J. Kroseberg, K. Krüger, T. Kuhr, T. Kurča, D. Lamb, M.P.J. Landon, W. Lange, T. Laštovička, P. Laycock, E. Lebailly, A. Lebedev, B. Leißner, R. Lemrani, V. Lendermann, S. Levonian, M. Lindstroem, B. List, E. Lobodzinska, B. Lobodzinski, A. Loginov, N. Loktionova, V. Lubimov, S. Lüders, D. Lüke, L. Lytkin, N. Malden, E. Malinovski, I. Malinovski, S. Mangano, R. Maraček, P. Marage, J. Marks, R. Marshall, H.-U. Martyn, J. Martyniak, S.J. Maxfield, D. Meer, A. Mehta, K. Meier, A.B. Meyer, H. Meyer, J. Meyer, P.-O. Meyer, S. Mikocki, D. Milstead, S. Mohrdieck, M.N. Mondragon, F. Moreau, A. Morozov, J.V. Morris, K. Müller, P. Murı́n, V. Nagovizin, B. Naroska, J. Naumann, Th. Naumann, G. Nellen, P.R. Newman, F. Niebergall, C. Niebuhr, O. Nix, G. Nowak, J.E. Olsson, D. Ozerov, V. Panassik, C. Pascaud, G.D. Patel, M. Peez, E. Perez, A. Petrukhin, J.P. Phillips, D. Pitzl, R. Pöschl, I. Potachnikova, B. Povh, G. Rädel, J. Rauschenberger, P. Reimer, B. Reisert, C. Risler, E. Rizvi, P. Robmann, R. Roosen, A. Rostovtsev, S. Rusakov, K. Rybicki, D.P.C. Sankey, S. Schätzel, J. Scheins, F.-P. Schilling, P. Schleper, D. Schmidt, S. Schmidt, S. Schmitt, M. Schneider, L. Schoeffel, A. Schöning, T. Schörner-Sadenius, V. Schröder, H.-C. Schultz-Coulon, C. Schwanenberger, K. Sedlák, F. Sefkow, V. Shekelyan, I. Sheviakov, L.N. Shtarkov, Y. Sirois, T. Sloan, P. Smirnov, Y. Soloviev, D. South, V. Spaskov, A. Specka, H. Spitzer, R. Stamen, B. Stella, J. Stiewe, I. Strauch, U. Straumann, M. Swart, S. Tchetchelnitski, G. Thompson, P.D. Thompson, F. Tomasz, D. Traynor, P. Truöl, G. Tsipolitis, I. Tsurin, J. Turnau, J.E. Turney, E. Tzamariudaki, S. Udluft, A. Uraev, M. Urban, A. Usik, S. Valkár, A. Valkárová, C. Vallée, P. Van Mechelen, S. Vassiliev, Y. Vazdik, A. Vest, A. Vichnevski, K. Wacker, J. Wagner, R. Wallny, B. Waugh, G. Weber, D. Wegener, C. Werner, N. Werner, M. Wessels, G. White, S. Wiesand, T. Wilksen, M. Winde, G.-G. Winter, Ch. Wissing, M. Wobisch, E.-E. Woehrling, E. Wünsch, A.C. Wyatt, J. Žáček, J. Zálešák, Z. Zhang, A. Zhokin, F. Zomer, M. zur Nedden, Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, H1 Collaboration, Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), Photon, Proton, 010308 nuclear & particles physics, Scattering, FOS: Physical sciences, Perturbative QCD, HERA, Jet (particle physics), 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Pseudorapidity, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, 010306 general physics, Nuclear Experiment
Abstract: A measurement of inclusive jet cross-sections in deep-inelastic ep scattering at HERA is presented based on data with an integrated luminosity of 21.1 pb^-1. The measurement is performed for photon virtualities Q^2 between 5 and 100 GeV^2, differentially in Q^2, in the jet transverse energy E_T, in E_T^2/Q^2 and in the pseudorapidity eta_lab. With the renormalization scale mu_R = E_T, perturbative QCD calculations in next-to-leading order (NLO) give a good description of the data in most of the phase space. Significant discrepancies are observed only for jets in the proton beam direction with E_T below 20 GeV and Q^2 below 20 GeV^2. This corresponds to the region in which NLO corrections are largest and further improvement of the calculations is thus of particular interest., 20 pages, 4 figures and 3 tables
Published: 2002

22. Search for excited neutrinos at HERA

Author: C. Adloff, V. Andreev, B. Andrieu, T. Anthonis, V. Arkadov, A. Astvatsatourov, A. Babaev, J. Bähr, P. Baranov, E. Barrelet, W. Bartel, P. Bate, J. Becker, A. Beglarian, O. Behnke, C. Beier, A. Belousov, T. Benisch, Ch. Berger, T. Berndt, J.C. Bizot, J. Boehme, V. Boudry, W. Braunschweig, V. Brisson, H.-B. Bröker, D.P. Brown, W. Brückner, D. Bruncko, J. Bürger, F.W. Büsser, A. Bunyatyan, A. Burrage, G. Buschhorn, L. Bystritskaya, A.J. Campbell, J. Cao, S. Caron, F. Cassol-Brunner, D. Clarke, B. Clerbaux, C. Collard, J.G. Contreras, Y.R. Coppens, J.A. Coughlan, M.-C. Cousinou, B.E. Cox, G. Cozzika, J. Cvach, J.B. Dainton, W.D. Dau, K. Daum, M. Davidsson, B. Delcourt, N. Delerue, R. Demirchyan, A. De Roeck, E.A. De Wolf, C. Diaconu, J. Dingfelder, P. Dixon, V. Dodonov, J.D. Dowell, A. Droutskoi, A. Dubak, C. Duprel, G. Eckerlin, D. Eckstein, V. Efremenko, S. Egli, R. Eichler, F. Eisele, E. Eisenhandler, M. Ellerbrock, E. Elsen, M. Erdmann, W. Erdmann, P.J.W. Faulkner, L. Favart, A. Fedotov, R. Felst, J. Ferencei, S. Ferron, M. Fleischer, Y.H. Fleming, G. Flügge, A. Fomenko, I. Foresti, J. Formánek, G. Franke, E. Gabathuler, K. Gabathuler, J. Garvey, J. Gassner, J. Gayler, R. Gerhards, C. Gerlich, S. Ghazaryan, L. Goerlich, N. Gogitidze, M. Goldberg, C. Grab, H. Grässler, T. Greenshaw, G. Grindhammer, T. Hadig, D. Haidt, L. Hajduk, J. Haller, W.J. Haynes, B. Heinemann, G. Heinzelmann, R.C.W. Henderson, S. Hengstmann, H. Henschel, R. Heremans, G. Herrera, I. Herynek, M. Hildebrandt, M. Hilgers, K.H. Hiller, J. Hladký, P. Höting, D. Hoffmann, R. Horisberger, S. Hurling, M. Ibbotson, Ç. İşsever, M. Jacquet, M. Jaffre, L. Janauschek, X. Janssen, V. Jemanov, L. Jönsson, C. Johnson, D.P. Johnson, M.A.S. Jones, H. Jung, D. Kant, M. Kapichine, M. Karlsson, O. Karschnick, F. Keil, N. Keller, J. Kennedy, I.R. Kenyon, S. Kermiche, C. Kiesling, P. Kjellberg, M. Klein, C. Kleinwort, T. Kluge, G. Knies, B. Koblitz, S.D. Kolya, V. Korbel, P. Kostka, S.K. Kotelnikov, R. Koutouev, A. Koutov, H. Krehbiel, J. Kroseberg, K. Krüger, A. Küpper, T. Kuhr, T. Kurča, R. Lahmann, D. Lamb, M.P.J. Landon, W. Lange, T. Laštovička, P. Laycock, E. Lebailly, A. Lebedev, B. Leißner, R. Lemrani, V. Lendermann, S. Levonian, M. Lindstroem, B. List, E. Lobodzinska, B. Lobodzinski, A. Loginov, N. Loktionova, V. Lubimov, S. Lüders, D. Lüke, L. Lytkin, H. Mahlke-Krüger, N. Malden, E. Malinovski, I. Malinovski, R. Maraček, P. Marage, J. Marks, R. Marshall, H.-U. Martyn, J. Martyniak, S.J. Maxfield, D. Meer, A. Mehta, K. Meier, A.B. Meyer, H. Meyer, J. Meyer, P.-O. Meyer, S. Mikocki, D. Milstead, T. Mkrtchyan, R. Mohr, S. Mohrdieck, M.N. Mondragon, F. Moreau, A. Morozov, J.V. Morris, K. Müller, P. Murı́n, V. Nagovizin, B. Naroska, J. Naumann, Th. Naumann, G. Nellen, P.R. Newman, T.C. Nicholls, F. Niebergall, C. Niebuhr, O. Nix, G. Nowak, J.E. Olsson, D. Ozerov, V. Panassik, C. Pascaud, G.D. Patel, M. Peez, E. Perez, J.P. Phillips, D. Pitzl, R. Pöschl, I. Potachnikova, B. Povh, K. Rabbertz, G. Rädel, J. Rauschenberger, P. Reimer, B. Reisert, D. Reyna, C. Risler, E. Rizvi, P. Robmann, R. Roosen, A. Rostovtsev, S. Rusakov, K. Rybicki, D.P.C. Sankey, J. Scheins, F.-P. Schilling, P. Schleper, D. Schmidt, S. Schmidt, S. Schmitt, M. Schneider, L. Schoeffel, A. Schöning, T. Schörner, V. Schröder, H.-C. Schultz-Coulon, C. Schwanenberger, K. Sedlák, F. Sefkow, V. Shekelyan, I. Sheviakov, L.N. Shtarkov, Y. Sirois, T. Sloan, P. Smirnov, Y. Soloviev, D. South, V. Spaskov, A. Specka, H. Spitzer, R. Stamen, B. Stella, J. Stiewe, U. Straumann, M. Swart, M. Taševský, V. Tchernyshov, S. Tchetchelnitski, G. Thompson, P.D. Thompson, N. Tobien, D. Traynor, P. Truöl, G. Tsipolitis, I. Tsurin, J. Turnau, J.E. Turney, E. Tzamariudaki, S. Udluft, M. Urban, A. Usik, S. Valkár, A. Valkárová, C. Vallée, P. Van Mechelen, S. Vassiliev, Y. Vazdik, A. Vichnevski, K. Wacker, R. Wallny, B. Waugh, G. Weber, M. Weber, D. Wegener, C. Werner, M. Werner, N. Werner, G. White, S. Wiesand, T. Wilksen, M. Winde, G.-G. Winter, Ch. Wissing, M. Wobisch, E.-E. Woehrling, E. Wünsch, A.C. Wyatt, J. Žáček, J. Zálešák, Z. Zhang, A. Zhokin, F. Zomer, J. Zsembery, M. zur Nedden, Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, Kerec, Hélène, Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and H1 Collaboration
Subjects: Coupling, Physics, Nuclear and High Energy Physics, Gauge boson, Particle physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, High Energy Physics::Phenomenology, FOS: Physical sciences, HERA, Lambda, 01 natural sciences, Luminosity, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Excited state, 0103 physical sciences, Physique des particules élémentaires, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Neutrino, 010306 general physics
Abstract: We present a search for excited neutrinos using e-p data taken by the H1 experiment at HERA at a center-of-mass energy of 318 GeV with an integrated luminosity of 15 pb-1. No evidence for excited neutrino production is found. Mass dependent exclusion limits are determined for the ratio of the coupling to the compositeness scale, f/A, independently of the relative couplings to the SU(2) and U(1) gauge bosons. These limits extend the excluded region to higher masses than has been possible in previous searches at other colliders. © 2002 Elsevier Science B.V. All rights reserved., 0, 400 auteurs, DESY 01-145 / hep-ex/0110037, H1 Collaboration., info:eu-repo/semantics/published
Published: 2002

23. Three-Jet Production in Deep-Inelastic Scattering at HERA

Author: C. Adloff, V. Andreev, B. Andrieu, T. Anthonis, V. Arkadov, A. Astvatsatourov, I. Ayyaz, A. Babaev, J. Bähr, P. Baranov, E. Barrelet, W. Bartel, P. Bate, A. Beglarian, O. Behnke, C. Beier, A. Belousov, T. Benisch, Ch. Berger, T. Berndt, J.C. Bizot, V. Boudry, W. Braunschweig, V. Brisson, H.-B. Bröker, D.P. Brown, W. Brückner, P. Bruel, D. Bruncko, J. Bürger, F.W. Büsser, A. Bunyatyan, H. Burkhardt, A. Burrage, G. Buschhorn, A.J. Campbell, J. Cao, T. Carli, S. Caron, D. Clarke, B. Clerbaux, C. Collard, J.G. Contreras, Y.R. Coppens, J.A. Coughlan, M.-C. Cousinou, B.E. Cox, G. Cozzika, J. Cvach, J.B. Dainton, W.D. Dau, K. Daum, M. Davidsson, B. Delcourt, N. Delerue, R. Demirchyan, A. De Roeck, E.A. De Wolf, C. Diaconu, J. Dingfelder, P. Dixon, V. Dodonov, J.D. Dowell, A. Droutskoi, A. Dubak, C. Duprel, G. Eckerlin, D. Eckstein, V. Efremenko, S. Egli, R. Eichler, F. Eisele, E. Eisenhandler, M. Ellerbrock, E. Elsen, M. Erdmann, W. Erdmann, P.J.W. Faulkner, L. Favart, A. Fedotov, R. Felst, J. Ferencei, S. Ferron, M. Fleischer, Y.H. Fleming, G. Flügge, A. Fomenko, I. Foresti, J. Formánek, J.M. Foster, G. Franke, E. Gabathuler, K. Gabathuler, J. Garvey, J. Gassner, J. Gayler, R. Gerhards, C. Gerlich, S. Ghazaryan, L. Goerlich, N. Gogitidze, M. Goldberg, C. Goodwin, C. Grab, H. Grässler, T. Greenshaw, G. Grindhammer, T. Hadig, D. Haidt, L. Hajduk, W.J. Haynes, B. Heinemann, G. Heinzelmann, A. Heister, R.C.W. Henderson, S. Hengstmann, H. Henschel, R. Heremans, G. Herrera, I. Herynek, M. Hildebrandt, M. Hilgers, K.H. Hiller, J. Hladký, P. Höting, D. Hoffmann, R. Horisberger, S. Hurling, M. Ibbotson, Ç. İşsever, M. Jacquet, M. Jaffre, L. Janauschek, D.M. Jansen, X. Janssen, V. Jemanov, L. Jönsson, D.P. Johnson, M.A.S. Jones, H. Jung, H.K. Kästli, D. Kant, M. Kapichine, M. Karlsson, O. Karschnick, F. Keil, N. Keller, J. Kennedy, I.R. Kenyon, S. Kermiche, C. Kiesling, P. Kjellberg, M. Klein, C. Kleinwort, G. Knies, B. Koblitz, S.D. Kolya, V. Korbel, P. Kostka, S.K. Kotelnikov, R. Koutouev, A. Koutov, M.W. Krasny, H. Krehbiel, J. Kroseberg, K. Krüger, A. Küpper, T. Kuhr, T. Kurča, R. Lahmann, D. Lamb, M.P.J. Landon, W. Lange, T. Laštovička, P. Laycock, E. Lebailly, A. Lebedev, B. Leißner, R. Lemrani, V. Lendermann, S. Levonian, M. Lindstroem, B. List, E. Lobodzinska, B. Lobodzinski, A. Loginov, N. Loktionova, V. Lubimov, S. Lüders, D. Lüke, L. Lytkin, N. Magnussen, H. Mahlke-Krüger, N. Malden, E. Malinovski, I. Malinovski, R. Maraček, P. Marage, J. Marks, R. Marshall, H.-U. Martyn, J. Martyniak, S.J. Maxfield, D. Meer, A. Mehta, K. Meier, P. Merkel, A.B. Meyer, H. Meyer, J. Meyer, P.-O. Meyer, S. Mikocki, D. Milstead, T. Mkrtchyan, R. Mohr, S. Mohrdieck, M.N. Mondragon, F. Moreau, A. Morozov, J.V. Morris, K. Müller, P. Murı́n, V. Nagovizin, B. Naroska, J. Naumann, Th. Naumann, G. Nellen, P.R. Newman, T.C. Nicholls, F. Niebergall, C. Niebuhr, O. Nix, G. Nowak, T. Nunnemann, J.E. Olsson, D. Ozerov, V. Panassik, C. Pascaud, G.D. Patel, M. Peez, E. Perez, J.P. Phillips, D. Pitzl, R. Pöschl, I. Potachnikova, B. Povh, K. Rabbertz, G. Rädel, J. Rauschenberger, P. Reimer, B. Reisert, D. Reyna, S. Riess, C. Risler, E. Rizvi, P. Robmann, R. Roosen, A. Rostovtsev, C. Royon, S. Rusakov, K. Rybicki, D.P.C. Sankey, J. Scheins, F.-P. Schilling, P. Schleper, D. Schmidt, S. Schmitt, M. Schneider, L. Schoeffel, A. Schöning, T. Schörner, V. Schröder, H.-C. Schultz-Coulon, C. Schwanenberger, K. Sedlák, F. Sefkow, V. Shekelyan, I. Sheviakov, L.N. Shtarkov, Y. Sirois, T. Sloan, P. Smirnov, V. Solochenko, Y. Soloviev, V. Spaskov, A. Specka, H. Spitzer, R. Stamen, J. Steinhart, B. Stella, A. Stellberger, J. Stiewe, U. Straumann, W. Struczinski, M. Swart, M. Taševský, V. Tchernyshov, S. Tchetchelnitski, G. Thompson, P.D. Thompson, N. Tobien, D. Traynor, P. Truöl, G. Tsipolitis, I. Tsurin, J. Turnau, J.E. Turney, E. Tzamariudaki, S. Udluft, A. Usik, S. Valkár, A. Valkárová, C. Vallée, P. Van Mechelen, S. Vassiliev, Y. Vazdik, A. Vichnevski, K. Wacker, R. Wallny, T. Walter, B. Waugh, G. Weber, M. Weber, D. Wegener, M. Werner, N. Werner, G. White, S. Wiesand, T. Wilksen, M. Winde, G.-G. Winter, Ch. Wissing, M. Wobisch, H. Wollatz, E. Wünsch, A.C. Wyatt, J. Žáček, J. Zálešák, Z. Zhang, A. Zhokin, F. Zomer, J. Zsembery, M. zur Nedden, Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and H1 Collaboration
Subjects: Quantum chromodynamics, Physics, Nuclear and High Energy Physics, education.field_of_study, Particle physics, 010308 nuclear & particles physics, Scattering, Astrophysics::High Energy Astrophysical Phenomena, Population, FOS: Physical sciences, Perturbative QCD, HERA, Jet (particle physics), Deep inelastic scattering, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Cross section (physics), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, 010306 general physics, education
Abstract: Three-jet production is studied for the first time in deep-inelastic positron-proton scattering. The measurement carried out with the H1 detector at HERA covers a large range of four-momentum transfer squared 5 < Q^2 < 5000 GeV^2 and invariant three-jet masses 25 < M_(3jet) < 140 GeV. Jets are defined by the inclusive k_T algorithm in the Breit frame. The size of the three-jet cross section and the ratio of the three-jet to the dijet cross section R_(3/2) are described over the whole phase space by the predictions of perturbative QCD in next-to-leading order. The shapes of angular jet distributions deviate significantly from a uniform population of the available phase space but are well described by the QCD calculation., 17 pages, 5 figures, 1 table
Published: 2001

24. A Search for leptoquark bosons in e- p collisions at HERA

Author: C. Adloff, V. Andreev, B. Andrieu, T. Anthonis, V. Arkadov, A. Astvatsatourov, A. Babaev, J. Bähr, P. Baranov, E. Barrelet, W. Bartel, P. Bate, J. Becker, A. Beglarian, O. Behnke, C. Beier, A. Belousov, T. Benisch, Ch. Berger, T. Berndt, J.C. Bizot, J. Boehme, V. Boudry, W. Braunschweig, V. Brisson, H.-B. Bröker, D.P. Brown, W. Brückner, D. Bruncko, J. Bürger, F.W. Büsser, A. Bunyatyan, A. Burrage, G. Buschhorn, L. Bystritskaya, A.J. Campbell, J. Cao, S. Caron, F. Cassol-Brunner, D. Clarke, B. Clerbaux, C. Collard, J.G. Contreras, Y.R. Coppens, J.A. Coughlan, M.-C. Cousinou, B.E. Cox, G. Cozzika, J. Cvach, J.B. Dainton, W.D. Dau, K. Daum, M. Davidsson, B. Delcourt, N. Delerue, R. Demirchyan, A. De Roeck, E.A. De Wolf, C. Diaconu, J. Dingfelder, P. Dixon, V. Dodonov, J.D. Dowell, A. Droutskoi, A. Dubak, C. Duprel, G. Eckerlin, D. Eckstein, V. Efremenko, S. Egli, R. Eichler, F. Eisele, E. Eisenhandler, M. Ellerbrock, E. Elsen, M. Erdmann, W. Erdmann, P.J.W. Faulkner, L. Favart, A. Fedotov, R. Felst, J. Ferencei, S. Ferron, M. Fleischer, Y.H. Fleming, G. Flügge, A. Fomenko, I. Foresti, J. Formánek, G. Franke, E. Gabathuler, K. Gabathuler, J. Garvey, J. Gassner, J. Gayler, R. Gerhards, C. Gerlich, S. Ghazaryan, L. Goerlich, N. Gogitidze, M. Goldberg, C. Grab, H. Grässler, T. Greenshaw, G. Grindhammer, T. Hadig, D. Haidt, L. Hajduk, J. Haller, W.J. Haynes, B. Heinemann, G. Heinzelmann, R.C.W. Henderson, S. Hengstmann, H. Henschel, R. Heremans, G. Herrera, I. Herynek, M. Hildebrandt, M. Hilgers, K.H. Hiller, J. Hladký, P. Höting, D. Hoffmann, R. Horisberger, S. Hurling, M. Ibbotson, Ç. İşsever, M. Jacquet, M. Jaffre, L. Janauschek, X. Janssen, V. Jemanov, L. Jönsson, C. Johnson, D.P. Johnson, M.A.S. Jones, H. Jung, D. Kant, M. Kapichine, M. Karlsson, O. Karschnick, F. Keil, N. Keller, J. Kennedy, I.R. Kenyon, S. Kermiche, C. Kiesling, P. Kjellberg, M. Klein, C. Kleinwort, T. Kluge, G. Knies, B. Koblitz, S.D. Kolya, V. Korbel, P. Kostka, S.K. Kotelnikov, R. Koutouev, A. Koutov, H. Krehbiel, J. Kroseberg, K. Krüger, A. Küpper, T. Kuhr, T. Kurča, R. Lahmann, D. Lamb, M.P.J. Landon, W. Lange, T. Laštovička, P. Laycock, E. Lebailly, A. Lebedev, B. Leißner, R. Lemrani, V. Lendermann, S. Levonian, M. Lindstroem, B. List, E. Lobodzinska, B. Lobodzinski, A. Loginov, N. Loktionova, V. Lubimov, S. Lüders, D. Lüke, L. Lytkin, H. Mahlke-Krüger, N. Malden, E. Malinovski, I. Malinovski, R. Maraček, P. Marage, J. Marks, R. Marshall, H.-U. Martyn, J. Martyniak, S.J. Maxfield, D. Meer, A. Mehta, K. Meier, A.B. Meyer, H. Meyer, J. Meyer, P.-O. Meyer, S. Mikocki, D. Milstead, T. Mkrtchyan, R. Mohr, S. Mohrdieck, M.N. Mondragon, F. Moreau, A. Morozov, J.V. Morris, K. Müller, P. Murı́n, V. Nagovizin, B. Naroska, J. Naumann, Th. Naumann, G. Nellen, P.R. Newman, T.C. Nicholls, F. Niebergall, C. Niebuhr, O. Nix, G. Nowak, J.E. Olsson, D. Ozerov, V. Panassik, C. Pascaud, G.D. Patel, M. Peez, E. Perez, J.P. Phillips, D. Pitzl, R. Pöschl, I. Potachnikova, B. Povh, K. Rabbertz, G. Rädel, J. Rauschenberger, P. Reimer, B. Reisert, D. Reyna, C. Risler, E. Rizvi, P. Robmann, R. Roosen, A. Rostovtsev, S. Rusakov, K. Rybicki, D.P.C. Sankey, J. Scheins, F.-P. Schilling, P. Schleper, D. Schmidt, S. Schmidt, S. Schmitt, M. Schneider, L. Schoeffel, A. Schöning, T. Schörner, V. Schröder, H.-C. Schultz-Coulon, C. Schwanenberger, K. Sedlák, F. Sefkow, V. Shekelyan, I. Sheviakov, L.N. Shtarkov, Y. Sirois, T. Sloan, P. Smirnov, Y. Soloviev, D. South, V. Spaskov, A. Specka, H. Spitzer, R. Stamen, B. Stella, J. Stiewe, U. Straumann, M. Swart, M. Taševský, V. Tchernyshov, S. Tchetchelnitski, G. Thompson, P.D. Thompson, N. Tobien, D. Traynor, P. Truöl, G. Tsipolitis, I. Tsurin, J. Turnau, J.E. Turney, E. Tzamariudaki, S. Udluft, M. Urban, A. Usik, S. Valkár, A. Valkárová, C. Vallée, P. Van Mechelen, S. Vassiliev, Y. Vazdik, A. Vichnevski, K. Wacker, R. Wallny, B. Waugh, G. Weber, M. Weber, D. Wegener, C. Werner, M. Werner, N. Werner, G. White, S. Wiesand, T. Wilksen, M. Winde, G.-G. Winter, Ch. Wissing, M. Wobisch, E.-E. Woehrling, E. Wünsch, A.C. Wyatt, J. Žáček, J. Zálešák, Z. Zhang, A. Zhokin, F. Zomer, J. Zsembery, M. zur Nedden, Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Kerec, Hélène, and H1 Collaboration
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, High Energy Physics::Phenomenology, FOS: Physical sciences, HERA, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Physique des particules élémentaires, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Leptoquark, High Energy Physics::Experiment, 010306 general physics, Boson
Abstract: A search for scalar and vector leptoquarks coupling to first generation fermions is performed in the HI experiment at the ep collider HERA. The analysis uses e-p data collected in 1998 and 1999 at a centre-of-mass energy of 320 GeV, corresponding to an integrated luminosity of ∼ 15 pb-1. No evidence for the direct production of such particles is found in a data sample with a large transverse momentum final state electron or with large missing transverse momentum, and constraints on leptoquark models are established. For a Yukawa coupling of electromagnetic strength leptoquarks are excluded for masses up to ∼ 290 GeV. This analysis complements the leptoquark searches performed previously using data collected whilst HERA was operating with positrons instead of electrons. © 2001 Elsevier Science B.V. All rights reserved., 0, SCOPUS: ar.j, info:eu-repo/semantics/published
Published: 2001

25. Low Q$^{2}$ Jet Production at HERA and Virtual Photon Structure

Author: C. Adloff, S. Aid, M. Anderson, V. Andreev, B. Andrieu, V. Arkadov, C. Arndt, I. Ayyaz, A. Babaev, J. Bähr, J. Bán, P. Baranov, E. Barrelet, R. Barschke, W. Bartel, U. Bassler, M. Beck, H.-J. Behrend, C. Beier, A. Belousov, Ch. Berger, G. Bernardi, G. Bertrand-Coremans, R. Beyer, P. Biddulph, J.C. Bizot, K. Borras, F. Botterweck, V. Boudry, S. Bourov, A. Braemer, W. Braunschweig, V. Brisson, D.P. Brown, W. Brückner, P. Bruel, D. Bruncko, C. Brune, J. Bürger, F.W. Büsser, A. Buniatian, S. Burke, G. Buschhorn, D. Calvet, A.J. Campbell, T. Carli, M. Charlet, D. Clarke, B. Clerbaux, S. Cocks, J.G. Contreras, C. Cormack, J.A. Coughlan, M.-C. Cousinou, B.E. Cox, G. Cozzika, D.G. Cussans, J. Cvach, S. Dagoret, J.B. Dainton, W.D. Dau, K. Daum, M. David, A. De Roeck, E.A. De Wolf, B. Delcourt, M. Dirkmann, P. Dixon, W. Dlugosz, K.T. Donovan, J.D. Dowell, A. Droutskoi, J. Ebert, T.R. Ebert, G. Eckerlin, V. Efremenko, S. Egli, R. Eichler, F. Eisele, E. Eisenhandler, E. Elsen, M. Erdmann, A.B. Fahr, L. Favart, A. Fedotov, R. Felst, J. Feltesse, J. Ferencei, F. Ferrarotto, K. Flamm, M. Fleischer, M. Flieser, G. Flügge, A. Fomenko, J. Formánek, J.M. Foster, G. Franke, E. Gabathuler, K. Gabathuler, F. Gaede, J. Garvey, J. Gayler, M. Gebauer, R. Gerhards, A. Glazov, L. Goerlich, N. Gogitidze, M. Goldberg, B. Gonzalez-Pineiro, I. Gorelov, C. Grab, H. Grässler, T. Greenshaw, R.K. Griffiths, G. Grindhammer, A. Gruber, C. Gruber, T. Hadig, D. Haidt, L. Hajduk, T. Haller, M. Hampel, W.J. Haynes, B. Heinemann, G. Heinzelmann, R.C.W. Henderson, S. Hengstmann, H. Henschel, I. Herynek, M.F. Hess, K. Hewitt, K.H. Hiller, C.D. Hilton, J. Hladký, M. Höppner, D. Hoffmann, T. Holtom, R. Horisberger, V.L. Hudgson, M. Hütte, M. Ibbotson, Ç. İşsever, H. Itterbeck, M. Jacquet, M. Jaffre, J. Janoth, D.M. Jansen, L. Jönsson, D.P. Johnson, H. Jung, P.I.P. Kalmus, M. Kander, D. Kant, U. Kathage, J. Katzy, H.H. Kaufmann, O. Kaufmann, M. Kausch, S. Kazarian, I.R. Kenyon, S. Kermiche, C. Keuker, C. Kiesling, M. Klein, C. Kleinwort, G. Knies, J.H. Köhne, H. Kolanoski, S.D. Kolya, V. Korbel, P. Kostka, S.K. Kotelnikov, T. Krämerkämper, M.W. Krasny, H. Krehbiel, D. Krücker, A. Küpper, H. Küster, M. Kuhlen, T. Kurča, B. Laforge, R. Lahmann, M.P.J. Landon, W. Lange, U. Langenegger, A. Lebedev, F. Lehner, V. Lemaitre, S. Levonian, M. Lindstroem, J. Lipinski, B. List, G. Lobo, G.C. Lopez, V. Lubimov, D. Lüke, L. Lytkin, N. Magnussen, H. Mahlke-Krüger, E. Malinovski, R. Maraček, P. Marage, J. Marks, R. Marshall, J. Martens, G. Martin, R. Martin, H.-U. Martyn, J. Martyniak, T. Mavroidis, S.J. Maxfield, S.J. McMahon, A. Mehta, K. Meier, P. Merkel, F. Metlica, A. Meyer, H. Meyer, J. Meyer, P.-O. Meyer, A. Migliori, S. Mikocki, D. Milstead, J. Moeck, F. Moreau, J.V. Morris, E. Mroczko, D. Müller, K. Müller, P. Murı́n, V. Nagovizin, R. Nahnhauer, B. Naroska, Th. Naumann, I. Négri, P.R. Newman, D. Newton, H.K. Nguyen, T.C. Nicholls, F. Niebergall, C. Niebuhr, Ch. Niedzballa, H. Niggli, G. Nowak, T. Nunnemann, H. Oberlack, J.E. Olsson, D. Ozerov, P. Palmen, E. Panaro, A. Panitch, C. Pascaud, S. Passaggio, G.D. Patel, H. Pawletta, E. Peppel, E. Perez, J.P. Phillips, A. Pieuchot, D. Pitzl, R. Pöschl, G. Pope, B. Povh, K. Rabbertz, P. Reimer, H. Rick, S. Riess, E. Rizvi, P. Robmann, R. Roosen, K. Rosenbauer, A. Rostovtsev, F. Rouse, C. Royon, K. Rüter, S. Rusakov, K. Rybicki, D.P.C. Sankey, P. Schacht, J. Scheins, S. Schiek, S. Schleif, P. Schleper, W. von Schlippe, D. Schmidt, G. Schmidt, L. Schoeffel, A. Schöning, V. Schröder, E. Schuhmann, H.-C. Schultz-Coulon, B. Schwab, F. Sefkow, A. Semenov, V. Shekelyan, I. Sheviakov, L.N. Shtarkov, G. Siegmon, U. Siewert, Y. Sirois, I.O. Skillicorn, T. Sloan, P. Smirnov, M. Smith, V. Solochenko, Y. Soloviev, A. Specka, J. Spiekermann, S. Spielman, H. Spitzer, F. Squinabol, P. Steffen, R. Steinberg, J. Steinhart, B. Stella, A. Stellberger, J. Stiewe, K. Stolze, U. Straumann, W. Struczinski, J.P. Sutton, M. Swart, S. Tapprogge, M. Taševský, V. Tchernyshov, S. Tchetchelnitski, J. Theissen, G. Thompson, P.D. Thompson, N. Tobien, R. Todenhagen, P. Truöl, J. Zálešák, G. Tsipolitis, J. Turnau, E. Tzamariudaki, P. Uelkes, A. Usik, S. Valkár, A. Valkárová, C. Vallée, P. Van Esch, P. Van Mechelen, D. Vandenplas, Y. Vazdik, P. Verrecchia, G. Villet, K. Wacker, A. Wagener, M. Wagener, R. Wallny, T. Walter, B. Waugh, G. Weber, M. Weber, D. Wegener, A. Wegner, T. Wengler, M. Werner, L.R. West, S. Wiesand, T. Wilksen, S. Willard, M. Winde, G.-G. Winter, C. Wittek, M. Wobisch, H. Wollatz, E. Wünsch, J. Žáček, D. Zarbock, Z. Zhang, A. Zhokin, P. Zini, F. Zomer, J. Zsembery, M. ZurNedden, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, Levy, Jean-Michel, Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and H1 Collaboration
Subjects: Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, Scattering, FOS: Physical sciences, Virtual particle, HERA, Jet (particle physics), 01 natural sciences, law.invention, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Transverse plane, law, Pseudorapidity, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, 010306 general physics, Collider, Nuclear Experiment
Abstract: The transition between photoproduction and deep-inelastic scattering is investigated in jet production at the HERA ep collider, using data collected by the H1 experiment. Measurements of the differential inclusive jet cross-sections dsigep/dEt* and dsigmep/deta*, where Et* and eta* are the transverse energy and the pseudorapidity of the jets in the virtual photon-proton centre of mass frame, are presented for 0 < Q2 < 49 GeV2 and 0.3 < y < 0.6. The interpretation of the results in terms of the structure of the virtual photon is discussed. The data are best described by QCD calculations which include a partonic structure of the virtual photon that evolves with Q2., 20 pages, 5 Figures
Published: 1997

26. Measurement of D∗± meson production and F2c in deep-inelastic scattering at HERA

Author: C. Adloff, V. Andreev, B. Andrieu, T. Anthonis, V. Arkadov, A. Astvatsatourov, A. Babaev, J. Bähr, P. Baranov, E. Barrelet, W. Bartel, P. Bate, A. Beglarian, O. Behnke, C. Beier, A. Belousov, T. Benisch, Ch. Berger, T. Berndt, J.C. Bizot, V. Boudry, W. Braunschweig, V. Brisson, H.-B. Bröker, D.P. Brown, W. Brückner, D. Bruncko, J. Bürger, F.W. Büsser, A. Bunyatyan, A. Burrage, G. Buschhorn, A.J. Campbell, J. Cao, T. Carli, S. Caron, D. Clarke, B. Clerbaux, C. Collard, J.G. Contreras, Y.R. Coppens, J.A. Coughlan, M.-C. Cousinou, B.E. Cox, G. Cozzika, J. Cvach, J.B. Dainton, W.D. Dau, K. Daum, M. Davidsson, B. Delcourt, N. Delerue, R. Demirchyan, A. De Roeck, E.A. De Wolf, C. Diaconu, J. Dingfelder, P. Dixon, V. Dodonov, J.D. Dowell, A. Droutskoi, A. Dubak, C. Duprel, G. Eckerlin, D. Eckstein, V. Efremenko, S. Egli, R. Eichler, F. Eisele, E. Eisenhandler, M. Ellerbrock, E. Elsen, M. Erdmann, W. Erdmann, P.J.W. Faulkner, L. Favart, A. Fedotov, R. Felst, J. Ferencei, S. Ferron, M. Fleischer, Y.H. Fleming, G. Flügge, A. Fomenko, I. Foresti, J. Formánek, J.M. Foster, G. Franke, E. Gabathuler, K. Gabathuler, J. Garvey, J. Gassner, J. Gayler, R. Gerhards, C. Gerlich, S. Ghazaryan, L. Goerlich, N. Gogitidze, M. Goldberg, C. Goodwin, C. Grab, H. Grässler, T. Greenshaw, G. Grindhammer, T. Hadig, D. Haidt, L. Hajduk, W.J. Haynes, B. Heinemann, G. Heinzelmann, R.C.W. Henderson, S. Hengstmann, H. Henschel, R. Heremans, G. Herrera, I. Herynek, M. Hildebrandt, M. Hilgers, K.H. Hiller, J. Hladký, P. Höting, D. Hoffmann, R. Horisberger, S. Hurling, M. Ibbotson, Ç. İşsever, M. Jacquet, M. Jaffre, L. Janauschek, D.M. Jansen, X. Janssen, V. Jemanov, L. Jönsson, D.P. Johnson, M.A.S. Jones, H. Jung, H.K. Kästli, D. Kant, M. Kapichine, M. Karlsson, O. Karschnick, F. Keil, N. Keller, J. Kennedy, I.R. Kenyon, S. Kermiche, C. Kiesling, P. Kjellberg, M. Klein, C. Kleinwort, T. Kluge, G. Knies, B. Koblitz, S.D. Kolya, V. Korbel, P. Kostka, S.K. Kotelnikov, R. Koutouev, A. Koutov, H. Krehbiel, J. Kroseberg, K. Krüger, A. Küpper, T. Kuhr, T. Kurča, R. Lahmann, D. Lamb, M.P.J. Landon, W. Lange, T. Laštovička, P. Laycock, E. Lebailly, A. Lebedev, B. Leißner, R. Lemrani, V. Lendermann, S. Levonian, M. Lindstroem, B. List, E. Lobodzinska, B. Lobodzinski, A. Loginov, N. Loktionova, V. Lubimov, S. Lüders, D. Lüke, L. Lytkin, H. Mahlke-Krüger, N. Malden, E. Malinovski, I. Malinovski, R. Maraček, P. Marage, J. Marks, R. Marshall, H.-U. Martyn, J. Martyniak, S.J. Maxfield, D. Meer, A. Mehta, K. Meier, P. Merkel, A.B. Meyer, H. Meyer, J. Meyer, P.-O. Meyer, S. Mikocki, D. Milstead, T. Mkrtchyan, R. Mohr, S. Mohrdieck, M.N. Mondragon, F. Moreau, A. Morozov, J.V. Morris, K. Müller, P. Murı́n, V. Nagovizin, B. Naroska, J. Naumann, Th. Naumann, G. Nellen, P.R. Newman, T.C. Nicholls, F. Niebergall, C. Niebuhr, O. Nix, G. Nowak, J.E. Olsson, D. Ozerov, V. Panassik, C. Pascaud, G.D. Patel, M. Peez, E. Perez, J.P. Phillips, D. Pitzl, R. Pöschl, I. Potachnikova, B. Povh, K. Rabbertz, G. Rädel, J. Rauschenberger, P. Reimer, B. Reisert, D. Reyna, C. Risler, E. Rizvi, P. Robmann, R. Roosen, A. Rostovtsev, S. Rusakov, K. Rybicki, D.P.C. Sankey, J. Scheins, F.-P. Schilling, P. Schleper, D. Schmidt, S. Schmitt, M. Schneider, L. Schoeffel, A. Schöning, T. Schörner, V. Schröder, H.-C. Schultz-Coulon, C. Schwanenberger, K. Sedlák, F. Sefkow, V. Shekelyan, I. Sheviakov, L.N. Shtarkov, Y. Sirois, T. Sloan, P. Smirnov, V. Solochenko, Y. Soloviev, D. South, V. Spaskov, A. Specka, H. Spitzer, R. Stamen, B. Stella, J. Stiewe, U. Straumann, M. Swart, M. Taševský, V. Tchernyshov, S. Tchetchelnitski, G. Thompson, P.D. Thompson, N. Tobien, D. Traynor, P. Truöl, G. Tsipolitis, I. Tsurin, J. Turnau, J.E. Turney, E. Tzamariudaki, S. Udluft, A. Usik, S. Valkár, A. Valkárová, C. Vallée, P. Van Mechelen, S. Vassiliev, Y. Vazdik, A. Vichnevski, K. Wacker, R. Wallny, B. Waugh, G. Weber, M. Weber, D. Wegener, C. Werner, M. Werner, N. Werner, G. White, S. Wiesand, T. Wilksen, M. Winde, G.-G. Winter, Ch. Wissing, M. Wobisch, E. Wünsch, A.C. Wyatt, J. Žáček, J. Zálešák, Z. Zhang, A. Zhokin, F. Zomer, J. Zsembery, M. zur Nedden, and H1 Collaboration
Subjects: Physics, Particle physics, Nuclear and High Energy Physics, Proton, Meson, Scattering, High Energy Physics::Phenomenology, Perturbative QCD, FOS: Physical sciences, HERA, Deep inelastic scattering, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), D meson, Physique des particules élémentaires, High Energy Physics::Experiment, Charm (quantum number), Nuclear Experiment
Abstract: The inclusive production of D*±(2010) mesons in deep-inelastic scattering is studied with the H1 detector at HERA. In the kinematic region 1 < Q2 < 100 GeV2 and 0.05 < y < 0.7 an e+ p cross section for inclusive D*± meson production of 8.50 ± 0.42(stat.)+1.21-1.00 (syst.) nb is measured in the visible range PtD* > 1.5 GeV and ηD*< 1.5. Single and double differential inclusive D*± meson cross sections are compared to perturbative QCD calculations in two different evolution schemes. The charm contribution to the proton structure, FC2(X, Q2), is determined by extrapolating the visible charm cross section to the full phase space. This contribution is found to rise from about 10% at Q2 = 1.5 GeV2 to more than 25% at Q2 = 60 GeV2 corresponding to x values ranging from 5 × 10-5 to 3 × 10-3. © 2002 Elsevier Science B.V. All rights reserved., 0, 400 auteurs, DESY 01-100 / hep-ex/0108039, H1 Collaboration., info:eu-repo/semantics/published
Full Text: View/download PDF

27. Diffractive photoproduction of psi(2S) mesons at HERA

Author: S. Hengstmann, J-P. Meyer, I. R. Kenyon, B. Stella, Stefan Schmitt, Ç. İşsever, T. Wilksen, V. Jemanov, H. Spitzer, P. Kjellberg, S. Levonian, Paul Richard Newman, Grzegorz Nowak, A. Vest, J. Kroseberg, F. Zomer, K. H. Hiller, L. Goerlich, I. Foresti, G. Cozzika, F. Eisele, C. Risler, H. U. Martyn, C. Beier, R. C. W. Henderson, Martin Erdmann, Paul Laycock, E. Malinovski, F. Niebergall, M. Hildebrandt, S. Hurling, J.P. Phillips, Stefan Valkar, R. Koutouev, A. Petrukhin, B. Leissner, R. Pöschl, A. Jacquet, V. Andreev, W. Brückner, V. Shekelyan, R. Lemrani, P. Kostka, G. Grindhammer, J. Dingfelder, S. Mangano, G. Radel, H.-B. Bröker, Hannes Jung, Alexander Zhokin, D.P. Brown, J. Haller, F. Keil, G. Nellen, J. Turnau, Laurent Schoeffel, J. Becker, C. Vallée, R. Heremans, A. Specka, C. Duprel, N. Werner, T. Kuhr, Dusan Bruncko, Murrough Landon, Ewelina Lobodzinska, Yves Sirois, E. Eisenhandler, S. Baumgartner, J. V. Morris, A. Bunyatyan, A. Rostovtsev, G. Buschhorn, B. Andrieu, M. Fleischer, D. Ozerov, B. Naroska, A. Droutskoi, Max Klein, R. Felst, J. Kennedy, V. Brisson, S. Vassiliev, D. Kant, Zhen Zhang, G. Thompson, T. Hadig, T. Greenshaw, Wolfgang Lange, G. Franke, Roland Horisberger, A. Valkárová, J. Gayler, M.N. Mondragon, Leif J. Jönsson, P. Höting, R. Maraček, D. Hoffmann, Andreas Meyer, D. Meer, H. Henschel, P. Van Mechelen, J.C. Bizot, R. Stamen, Rainer Wallny, K. Sedlák, S. Udluft, Martin Karlsson, E. Gabathuler, Y. H. Fleming, David Milstead, P. A. Smirnov, J. Ferencei, J. Naumann, J. Marks, Bogdan Povh, A. Astvatsatourov, M. Lindstroem, T. Kluge, A. Usik, G. Frising, Claus Kleinwort, B. Reisert, J. Bähr, J. Formánek, D. Lüke, S. Luders, A. Schöning, E. Wünsch, T. Laštovička, V. Lubimov, E. Barrelet, Peter Robmann, S. Schmidt, Dave Sankey, C. Niebuhr, S. Egli, K. Daum, H. Meyer, F. Tomasz, R. Demirchyan, J. Zacek, S. Wiesand, G. Tsipolitis, M. Hilgers, J. Garvey, Xavier Janssen, M. Kapichine, A. Koutov, B. Delcourt, Glenn J. White, Y. Soloviev, D. Clarke, E. A. De Wolf, Ch. Berger, Karlheinz Meier, R. Roosen, G. Knies, Matthew Jones, A. M. Fomenko, P. Dixon, G. D. Patel, S. Ferron, Hans-Christian Schultz-Coulon, F. Moreau, J. D. Dowell, B. Lobodzinski, K. Gabathuler, A. Vichnevski, D. Wegener, John A Coughlan, L. Lytkin, F. P. Schilling, D.P. Johnson, I. Herynek, Cristinel Diaconu, E. Lebailly, C. Gerlich, T. Schorner, N. Malden, N. Delerue, O. Karschnick, David Schmidt, W.J. Haynes, Caroline Collard, A. Dubak, S. D. Kolya, M. Jaffre, J. E. Olsson, Daniel Pitzl, Markus Wobisch, Anton Babaev, K. Rybicki, L. N. Shtarkov, W. Bartel, V. Nagovizin, J. Scheins, D. South, J. G. Contreras, A. Lebedev, V. Lendermann, F. Sefkow, D. Traynor, Y. R. Coppens, E.-E. Woehrling, F. W. Büsser, W. Braunschweig, F. Cassol-Brunner, S. K. Kotelnikov, R. Eichler, Christoph Grab, D. Haidt, T. Berndt, A. Burrage, R. Marshall, Wolfram Erdmann, V. Panassik, B. List, P.-O. Meyer, Y. Vazdik, P.D. Thompson, S. Tchetchelnitski, M. Schneider, M. Peez, Vincent Boudry, A. N. Morozov, Pavel Murin, H. Grässler, Jan Hladky, I. Strauch, V. Efremenko, B. Koblitz, W.D. Dau, J. B. Dainton, L. Hajduk, M. Urban, Eram Rizvi, G. Heinzelmann, V. Dodonov, Beate Heinemann, C. Pascaud, Guenter Eckerlin, S. Mikocki, Pierre Marage, Philipp Fleischmann, A. Beglarian, S. Mohrdieck, M. Ibbotson, M. Beckingham, O. Behnke, I. Sheviakov, Doris Eckstein, A. Loginov, Laurent Favart, T. Anthonis, A. Fedotov, Günter Flügge, C. Kiesling, V. Spaskov, V. Grabski, A.C. Wyatt, A. De Roeck, E. Tzamariudaki, A. J. Campbell, K. Wacker, S. Ghazaryan, T. Kurča, S. Schatzel, M. Davidsson, B. Waugh, G. Weber, U. Straumann, Thomas Naumann, I. Malinovski, J. Wagner, S. Caron, J. Böhme, M. Winde, A. Uraev, N. Keller, V. Schröder, Eckhard Elsen, C. Wissing, L. Janauschek, V. Korbel, I. Potachnikova, Katja Krüger, C. Werner, M. Swart, D. Lamb, M. zur Nedden, L. Bystritskaya, J. Cvach, J. Zalesak, J. Martyniak, K. Müller, Christian Schwanenberger, Stephen Maxfield, J. Stiewe, M. C. Cousinou, Andrew Mehta, N. Gogitidze, C. Johnson, M. Wessels, M. Ellerbrock, G. Herrera, J.E. Turney, Bradley Cox, P. Baranov, Peter Schleper, T. J. Sloan, P.J.W. Faulkner, A.S. Belousov, Sergey Rusakov, P. Truöl, J. Rauschenberger, N. Loktionova, J. Gassner, S. Kermiche, C. Adloff, A. Hovhannisyan, I. Tsurin, E. Perez, R. Gerhards, P. E. Reimer, G. G. Winter, O. Nix, Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1 Collaboration, and Kerec, Hélène
Subjects: Diffraction, Physics, Nuclear and High Energy Physics, Particle physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Meson, 010308 nuclear & particles physics, Momentum transfer, Perturbative QCD, HERA, 01 natural sciences, Nuclear physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Wave function
Abstract: Results on diffractive photoproduction of psi(2S) mesons are presented using data collected between 1996 and 2000 with the H1 detector at the HERA ep collider. The data correspond to an integrated luminosity of 77 pb(-1). The energy dependence of the diffractive psi(2S) cross section is found to be similar to or possibly somewhat steeper than that for J/psi mesons. The dependences of the elastic and proton dissociative psi(2S) photoproduction cross sections on the squared momentum transfer t at the proton vertex are measured. The t-dependence of the elastic channel, parametrised as e(bt), yields b(el)(psi(2S)) = (4.31 +/- 0.57 +/- 0.46) GeV-2, compatible with that of the J/psi. For the proton dissociative channel the result b(pd)(psi(2S)) = (0.59 +/- 0.13 +/- 0.12) GeV-2 is 2.3 standard deviations smaller than that measured for the J/psi. With proper account of the individual wavefunctions theoretical predictions based on perturbative QCD are found to describe the measurements well. (C) 2002 Elsevier Science B.V. All rights reserved.

28. Measurement of open beauty production at HERA

Author: C. Adloff, V. Andreev, B. Andrieu, V. Arkadov, A. Astvatsatourov, I. Ayyaz, A. Babaev, J. Bähr, P. Baranov, E. Barrelet, W. Bartel, U. Bassler, P. Bate, A. Beglarian, O. Behnke, C. Beier, A. Belousov, T. Benisch, Ch. Berger, G. Bernardi, T. Berndt, G. Bertrand-Coremans, P. Biddulph, J.C. Bizot, V. Boudry, W. Braunschweig, V. Brisson, H.-B. Bröker, D.P. Brown, W. Brückner, P. Bruel, D. Bruncko, J. Bürger, F.W. Büsser, A. Bunyatyan, S. Burke, A. Burrage, G. Buschhorn, D. Calvet, A.J. Campbell, J. Cao, T. Carli, E. Chabert, M. Charlet, D. Clarke, B. Clerbaux, C. Collard, J.G. Contreras, J.A. Coughlan, M.-C. Cousinou, B.E. Cox, G. Cozzika, J. Cvach, J.B. Dainton, W.D. Dau, K. Daum, M. David, M. Davidsson, B. Delcourt, R. Demirchyan, A. De Roeck, E.A. De Wolf, C. Diaconu, P. Dixon, V. Dodonov, K.T. Donovan, J.D. Dowell, A. Droutskoi, C. Duprel, J. Ebert, G. Eckerlin, D. Eckstein, V. Efremenko, S. Egli, R. Eichler, F. Eisele, E. Eisenhandler, E. Elsen, M. Erdmann, A.B. Fahr, P.J.W. Faulkner, L. Favart, A. Fedotov, R. Felst, J. Feltesse, J. Ferencei, F. Ferrarotto, S. Ferron, M. Fleischer, G. Flügge, A. Fomenko, I. Foresti, J. Formánek, J.M. Foster, G. Franke, E. Gabathuler, K. Gabathuler, J. Garvey, J. Gassner, J. Gayler, R. Gerhards, S. Ghazaryan, A. Glazov, L. Goerlich, N. Gogitidze, M. Goldberg, I. Gorelov, C. Grab, H. Grässler, T. Greenshaw, R.K. Griffiths, G. Grindhammer, T. Hadig, D. Haidt, L. Hajduk, V. Haustein, W.J. Haynes, B. Heinemann, G. Heinzelmann, R.C.W. Henderson, S. Hengstmann, H. Henschel, R. Heremans, G. Herrera, I. Herynek, M. Hilgers, K.H. Hiller, C.D. Hilton, J. Hladký, P. Höting, D. Hoffmann, R. Horisberger, S. Hurling, M. Ibbotson, M. Jacquet, M. Jaffre, L. Janauschek, D.M. Jansen, X. Janssen, L. Jönsson, D.P. Johnson, A. Zhokin, M. Jones, H. Jung, H.K. Kästli, D. Kant, M. Kapichine, M. Karlsson, O. Karschnick, O. Kaufmann, M. Kausch, F. Keil, N. Keller, I.R. Kenyon, S. Kermiche, C. Kiesling, M. Klein, C. Kleinwort, G. Knies, H. Kolanoski, S.D. Kolya, V. Korbel, P. Kostka, S.K. Kotelnikov, M.W. Krasny, H. Krehbiel, J. Kroseberg, D. Krücker, K. Krüger, A. Küpper, T. Kuhr, T. Kurča, W. Lachnit, R. Lahmann, D. Lamb, M.P.J. Landon, W. Lange, U. Langenegger, A. Lebedev, F. Lehner, V. Lemaitre, R. Lemrani, V. Lendermann, S. Levonian, M. Lindstroem, V. Lubimov, G. Lobo, E. Lobodzinska, S. Lüders, D. Lüke, L. Lytkin, N. Magnussen, H. Mahlke-Krüger, N. Malden, E. Malinovski, I. Malinovski, R. Maraček, P. Marage, J. Marks, R. Marshall, H.-U. Martyn, J. Martyniak, S.J. Maxfield, T.R. McMahon, A. Mehta, K. Meier, P. Merkel, F. Metlica, A. Meyer, H. Meyer, J. Meyer, P.-O. Meyer, S. Mikocki, D. Milstead, R. Mohr, S. Mohrdieck, M.N. Mondragon, F. Moreau, A. Morozov, J.V. Morris, D. Müller, K. Müller, P. Murı́n, V. Nagovizin, B. Naroska, J. Naumann, Th. Naumann, I. Négri, P.R. Newman, H.K. Nguyen, T.C. Nicholls, F. Niebergall, C. Niebuhr, O. Nix, G. Nowak, T. Nunnemann, J.E. Olsson, A. Usik, D. Ozerov, P. Palmen, V. Panassik, C. Pascaud, S. Passaggio, G.D. Patel, H. Pawletta, E. Perez, J.P. Phillips, D. Pitzl, R. Pöschl, I. Potashnikova, B. Povh, K. Rabbertz, G. Rädel, J. Rauschenberger, P. Reimer, B. Reisert, D. Reyna, S. Riess, E. Rizvi, P. Robmann, R. Roosen, A. Rostovtsev, C. Royon, S. Rusakov, K. Rybicki, D.P.C. Sankey, J. Scheins, F.-P. Schilling, S. Schleif, P. Schleper, D. Schmidt, L. Schoeffel, T. Schörner, V. Schröder, H.-C. Schultz-Coulon, F. Sefkow, V. Shekelyan, I. Sheviakov, L.N. Shtarkov, G. Siegmon, Y. Sirois, T. Sloan, P. Smirnov, M. Smith, V. Solochenko, Y. Soloviev, V. Spaskov, A. Specka, H. Spitzer, R. Stamen, J. Steinhart, B. Stella, A. Stellberger, J. Stiewe, U. Straumann, W. Struczinski, J.P. Sutton, M. Swart, M. Taševský, V. Tchernyshov, S. Tchetchelnitski, G. Thompson, P.D. Thompson, N. Tobien, R. Todenhagen, D. Traynor, P. Truöl, G. Tsipolitis, J. Turnau, J. Turney, E. Tzamariudaki, S. Udluft, S. Valkár, A. Valkárová, C. Vallée, A. Van Haecke, P. Van Mechelen, Y. Vazdik, G. Villet, S. von Dombrowski, K. Wacker, R. Wallny, T. Walter, B. Waugh, G. Weber, M. Weber, D. Wegener, A. Wegner, T. Wengler, M. Werner, L.R. West, G. White, S. Wiesand, T. Wilksen, M. Winde, G.-G. Winter, Ch. Wissing, M. Wobisch, H. Wollatz, E. Wünsch, J. Žáček, J. Zálešák, Z. Zhang, P. Zini, F. Zomer, J. Zsembery, M. zur Nedden, H1 Collaboration, Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), and Damoiseaux, Magali
Subjects: Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Muon, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Sigma, FOS: Physical sciences, HERA, 01 natural sciences, 7. Clean energy, Bottom quark, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, 010306 general physics, Bar (unit)
Abstract: The first observation of open b production in ep collisions is reported. An event sample containing muons and jets has been selected which is enriched in semileptonic b quark decays. The visible cross section \sigma(ep -> b \bar{b}X -> \mu X') for Q^2 < 1 GeV^2, 0.1 < y < 0.8 is measured to be 0.176+-0.016(stat.)+0.026-0.017(syst.) nb for the muons to be detected in the range 35 deg < \theta^\mu < 130 deg and \pt^\mu > 2.0 GeV in the laboratory frame. The expected visible cross section based on a NLO QCD calculation is 0.104+-0.017 nb. The cross sections for electroproduction with Q^2 e b\bar{b}X) = 7.1+-0.6(stat.)+1.5-1.3(syst.) nb and \sigma(\gamma p-> b\bar{b} X) = 111+-10(stat.)+23-20(syst.) at an average \sim 180 GeV, respectively., Comment: 11 pages, 4 figures, 0 tables, submitted to Physics Letters B

29. High performance volume-of-intersection projectors for 3D-PET image reconstruction based on polar symmetries and SIMD vectorisation.

Author: J J Scheins, K Vahedipour, U Pietrzyk, and N J Shah
Subjects: *PROJECTORS, *POSITRON emission tomography, *IMAGE reconstruction, *SIMD (Computer architecture), *CENTRAL processing units
Abstract: For high-resolution, iterative 3D PET image reconstruction the efficient implementation of forward-backward projectors is essential to minimise the calculation time. Mathematically, the projectors are summarised as a system response matrix (SRM) whose elements define the contribution of image voxels to lines-of-response (LORs). In fact, the SRM easily comprises billions of non-zero matrix elements to evaluate the tremendous number of LORs as provided by state-of-the-art PET scanners. Hence, the performance of iterative algorithms, e.g. maximum-likelihood-expectation-maximisation (MLEM), suffers from severe computational problems due to the intensive memory access and huge number of floating point operations.Here, symmetries occupy a key role in terms of efficient implementation. They reduce the amount of independent SRM elements, thus allowing for a significant matrix compression according to the number of exploitable symmetries. With our previous work, the PET REconstruction Software TOolkit (PRESTO), very high compression factors (>300) are demonstrated by using specific non-Cartesian voxel patterns involving discrete polar symmetries. In this way, a pre-calculated memory-resident SRM using complex volume-of-intersection calculations can be achieved. However, our original ray-driven implementation suffers from addressing voxels, projection data and SRM elements in disfavoured memory access patterns. As a consequence, a rather limited numerical throughput is observed due to the massive waste of memory bandwidth and inefficient usage of cache respectively.In this work, an advantageous symmetry-driven evaluation of the forward-backward projectors is proposed to overcome these inefficiencies. The polar symmetries applied in PRESTO suggest a novel organisation of image data and LOR projection data in memory to enable an efficient single instruction multiple data vectorisation, i.e. simultaneous use of any SRM element for symmetric LORs. In addition, the calculation time is further reduced by using simultaneous multi-threading (SMT). A global speedup factor of 11 without SMT and above 100 with SMT has been achieved for the improved CPU-based implementation while obtaining equivalent numerical results. [ABSTRACT FROM AUTHOR]
Published: 2015
Full Text: View/download PDF

30. Impact of improved dead time correction on the quantification accuracy of a dedicated BrainPET scanner.

Author: Issa ASM, Scheins J, Tellmann L, Brambilla CR, Lohmann P, Rota-Kops E, Herzog H, Neuner I, Shah NJ, and Lerche C
Subjects: Phantoms, Imaging, Head, Magnetic Resonance Imaging, Positron-Emission Tomography methods, Brain diagnostic imaging, Brain blood supply, Oximes, Pyridines
Abstract: Objective: Quantitative values derived from PET brain images are of high interest for neuroscientific applications. Insufficient DT correction (DTC) can lead to a systematic bias of the output parameters obtained by a detailed analysis of the time activity curves (TACs). The DTC method currently used for the Siemens 3T MR BrainPET insert is global, i.e., differences in DT losses between detector blocks are not considered, leading to inaccurate DTC and, consequently, to inaccurate measurements masked by a bias. However, following careful evaluation with phantom measurements, a new block-pairwise DTC method has demonstrated a higher degree of accuracy compared to the global DTC method., Approach: Differences between the global and the block-pairwise DTC method were studied in this work by applying several radioactive tracers. We evaluated the impact on [11C]ABP688, O-(2-[18F]fluoroethyl)-L-tyrosine (FET), and [15O]H2O TACs., Results: For [11C]ABP688, a relevant bias of between -0.0034 and -0.0053 ml/ (cm3 • min) was found in all studied brain regions for the volume of distribution (VT) when using the current global DTC method. For [18F]FET-PET, differences of up to 10% were observed in the tumor-to-brain ratio (TBRmax), these differences depend on the radial distance of the maximum from the PET isocenter. For [15O]H2O, differences between +4% and -7% were observed in the GM region. Average biases of -4.58%, -3.2%, and -1.2% for the regional cerebral blood flow (CBF (K1)), the rate constant k2, and the volume of distribution VT were observed, respectively. Conversely, in the white matter region, average biases of -4.9%, -7.0%, and 3.8% were observed for CBF (K1), k2, and VT, respectively., Conclusion: The bias introduced by the global DTC method leads to an overestimation in the studied quantitative parameters for all applications compared to the block-pairwise method., Significance: The observed differences between the two DTC methods are particularly relevant for research applications in neuroscientific studies as they affect the accuracy of quantitative Brain PET images., Competing Interests: The authors have declared that no competing interests exist., (Copyright: © 2024 Issa et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.)
Published: 2024
Full Text: View/download PDF

31. Setup and characterisation according to NEMA NU 4 of the pheno PET scanner, a PET system dedicated for plant sciences.

Author: Hinz C, Jahnke S, Metzner R, Pflugfelder D, Scheins J, Streun M, and Koller R
Subjects: Mice, Rats, Animals, Phantoms, Imaging, Positron-Emission Tomography methods, Image Processing, Computer-Assisted
Abstract: Objective. The pheno PET system is a plant dedicated positron emission tomography (PET) scanner consisting of fully digital photo multipliers with lutetium-yttrium oxyorthosilicate crystals and located inside a custom climate chamber. Here, we present the setup of pheno PET, its data processing and image reconstruction together with its performance. Approach. The performance characterization follows the national electrical manufacturers association (NEMA) standard for small animal PET systems with a number of adoptions due to the vertical oriented bore of a PET for plant sciences. In addition temperature stability and spatial resolution with a hot rod phantom are addressed. Main results. The spatial resolution for a 22 Na point source at a radial distance of 5 mm to the center of the field-of-view (FOV) is 1.45 mm, 0.82 mm and 1.88 mm with filtered back projection in radial, tangential and axial direction, respectively. A hot rod phantom with 18 F gives a spatial resolution of up to 1.6 mm. The peak noise-equivalent count rates are 550 kcps @ 35.08 MBq, 308 kcps @ 33 MBq and 45 kcps @ 40.60 MBq for the mouse, rat and monkey size scatter phantoms, respectively. The scatter fractions for these phantoms are 12.63%, 22.64% and 55.90%. We observe a peak sensitivity of up to 3.6% and a total sensitivity of up to S A , tot = 2.17%. For the NEMA image quality phantom we observe a uniformity of % STD = 4.22% with ordinary Poisson maximum likelihood expectation-maximization with 52 iterations. Here, recovery coefficients of 0.12, 0.64, 0.89, 0.93 and 0.91 for 1 mm, 2 mm, 3 mm, 4 mm and 5 mm rods are obtained and spill-over ratios of 0.08 and 0.14 for the water-filled and air-filled inserts, respectively. Significance. The pheno PET and its laboratory are now in routine operation for the administration of [ 11 C]CO 2 and non-invasive measurement of transport and allocation of 11 C-labelled photoassimilates in plants., (Creative Commons Attribution license.)
Published: 2024
Full Text: View/download PDF

32. Assessment of Brain Tumour Perfusion Using Early-Phase 18 F-FET PET: Comparison with Perfusion-Weighted MRI.

Author: Filss CP, Cramer J, Löher S, Lohmann P, Stoffels G, Stegmayr C, Kocher M, Heinzel A, Galldiks N, Wittsack HJ, Sabel M, Neumaier B, Scheins J, Shah NJ, Meyer PT, Mottaghy FM, and Langen KJ
Subjects: Humans, Magnetic Resonance Imaging methods, Positron-Emission Tomography methods, Tyrosine, Perfusion, Brain Neoplasms pathology, Glioma pathology, Meningeal Neoplasms
Abstract: Purpose: Morphological imaging using MRI is essential for brain tumour diagnostics. Dynamic susceptibility contrast (DSC) perfusion-weighted MRI (PWI), as well as amino acid PET, may provide additional information in ambiguous cases. Since PWI is often unavailable in patients referred for amino acid PET, we explored whether maps of relative cerebral blood volume (rCBV) in brain tumours can be extracted from the early phase of PET using O-(2- 18 F-fluoroethyl)-L-tyrosine ( 18 F-FET)., Procedure: Using a hybrid brain PET/MRI scanner, PWI and dynamic 18 F-FET PET were performed in 33 patients with cerebral glioma and four patients with highly vascularized meningioma. The time interval from 0 to 2 min p.i. was selected to best reflect the blood pool phase in 18 F-FET PET. For each patient, maps of MR-rCBV, early 18 F-FET PET (0-2 min p.i.) and late 18 F-FET PET (20-40 min p.i.) were generated and coregistered. Volumes of interest were placed on the tumour (VOI-TU) and normal-appearing brain (VOI-REF). The correlation between tumour-to-brain ratios (TBR) of the different parameters was analysed. In addition, three independent observers evaluated MR-rCBV and early 18 F-FET maps ( 18 F-FET-rCBV) for concordance in signal intensity, tumour extent and intratumoural distribution., Results: TBRs calculated from MR-rCBV and 18 F-FET-rCBV showed a significant correlation (r = 0.89, p < 0.001), while there was no correlation between late 18 F-FET PET and MR-rCBV (r = 0.24, p = 0.16) and 18 F-FET-rCBV (r = 0.27, p = 0.11). Visual rating yielded widely agreeing findings or only minor differences between MR-rCBV maps and 18 F-FET-rCBV maps in 93 % of the tumours (range of three independent raters 91-94%, kappa among raters 0.78-1.0)., Conclusion: Early 18 F-FET maps (0-2 min p.i.) in gliomas provide similar information to MR-rCBV maps and may be helpful when PWI is not possible or available. Further studies in gliomas are needed to evaluate whether 18 F-FET-rCBV provides the same clinical information as MR-rCBV., (© 2023. The Author(s).)
Published: 2024
Full Text: View/download PDF

33. GABA A receptor availability relates to emotion-induced BOLD responses in the medial prefrontal cortex: simultaneous fMRI/PET with [ 11 C]flumazenil.

Author: Heinzel A, Mauler J, Herzog H, Boers F, Mottaghy FM, Langen KJ, Scheins J, Lerche C, Neumaier B, Northoff G, and Shah NJ
Abstract: Introduction: The fMRI BOLD response to emotional stimuli highlighting the role of the medial prefrontal cortex (MPFC) has been thoroughly investigated. Recently, the relationship between emotion processing and GABA levels has been studied using MPFC proton magnetic resonance spectroscopy (1H-MRS). However, the role of GABAA receptors in the MPFC during emotion processing remains unexplored., Methods: Using [11C]flumazenil PET, we investigated the relationship between the binding potential of GABAA receptors and emotion processing as measured using simultaneous fMRI BOLD. We hypothesized a correlation between the percent signal change in the BOLD signal and the binding potential of GABAA receptors in the MPFC. In a combined simultaneous fMRI and [11C]flumazenil-PET study, we analyzed the data from 15 healthy subjects using visual emotional stimuli. Our task comprised two types of emotional processing: passive viewing and appraisal. Following the administration of a bolus plus infusion protocol, PET and fMRI data were simultaneously acquired in a hybrid 3 T MR-BrainPET., Results: We found a differential correlation of BOLD percent signal change with [11C]flumazenil binding potential in the MPFC. Specifically, [11C]flumazenil binding potential in the ventromedial prefrontal cortex (vMPFC) correlated with passive viewing of emotionally valenced pictures. In contrast, the [11C]flumazenil binding potential and the BOLD signal induced by picture appraisal did show a correlation in the paracingulate gyrus., Conclusion: Our data deliver first evidence for a relationship between MPFC GABAA receptors and emotion processing in the same region. Moreover, we observed that GABAA receptors appear to play different roles in emotion processing in the vMPFC (passive viewing) and paracingulate gyrus (appraisal)., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2023 Heinzel, Mauler, Herzog, Boers, Mottaghy, Langen, Scheins, Lerche, Neumaier, Northoff and Shah.)
Published: 2023
Full Text: View/download PDF

34. Impact of framing scheme optimization and smoking status on binding potential analysis in dynamic PET with [ 11 C]ABP688.

Author: Régio Brambilla C, Scheins J, Tellmann L, Issa A, Herzog H, Shah NJ, Neuner I, and Lerche CW
Abstract: Background: For positron emission tomography (PET) ligands, such as [ 11 C]ABP688, to be able to provide more evidence about the glutamatergic hypothesis in schizophrenia (SZ), quantification bias during dynamic PET studies and its propagation into the estimated values of non-displaceable binding potential (BP ND ) must be addressed. This would enable more accurate quantification during bolus + infusion (BI) neuroreceptor studies and further our understanding of neurological diseases. Previous studies have shown BP ND -related biases can often occur due to overestimated cerebellum activity (reference region). This work investigates whether an alternative framing scheme can minimize quantification biases propagated into BP ND , whether confounders, such as smoking status, need to be controlled for during the study, and what the consequences for the data interpretation following analysis are. A group of healthy controls (HC) and a group of SZ patients (balanced and unbalanced number of smokers) were investigated with [ 11 C]ABP688 and a BI protocol. Possible differences in BP ND quantification as a function of smoking status were tested with constant 5 min ('Const 5 min') and constant true counts ('Const Trues') framing schemes. In order to find biomarkers for SZ, the differences in smoking effects were compared between groups. The normalized BP ND and the balanced number of smokers and non-smokers for both framing schemes were evaluated., Results: When applying F-tests to the 'Const 5 min' framing scheme, effect sizes (η 2 p) and brain regions which showed significant effects fluctuated considerably with F = 50.106 ± 54.948 (9.389 to 112.607), P-values 0.005 to < 0.001 and η 2 p = 0.514 ± 0.282 (0.238 to 0.801). Conversely, when the 'Const Trues' framing scheme was applied, the results showed much smaller fluctuations with F = 78.038 ± 8.975 (86.450 to 68.590), P < 0.001 for all conditions and η 2 p = 0.730 ± 0.017 (0.742 to 0.710), and regions with significant effects were more robustly reproduced. Further, differences, which would indicate false positive identifications between HC and SZ groups in five brain regions when using the 'Const 5 min' framing scheme, were not observed with the 'Const Trues' framing., Conclusions: Based on an [ 11 C]ABP688 PET study in SZ patients, the results show that non-consistent BP ND outcomes can be propagated by the framing scheme and that potential bias can be minimized using 'Const Trues' framing., (© 2023. The Author(s).)
Published: 2023
Full Text: View/download PDF

35. Fast 3D kernel computation method for positron range correction in PET.

Author: Li C, Scheins J, Tellmann L, Issa A, Wei L, Shah NJ, and Lerche C
Subjects: Tomography, X-Ray Computed, Positron-Emission Tomography methods, Computer Simulation, Phantoms, Imaging, Electrons, Polyurethanes
Abstract: Objective . The positron range is a fundamental, detector-independent physical limitation to spatial resolution in positron emission tomography (PET) as it causes a significant blurring of underlying activity distribution in the reconstructed images. A major challenge for positron range correction methods is to provide accurate range kernels that inherently incorporate the generally inhomogeneous stopping power, especially at tissue boundaries. In this work, we propose a novel approach to generate accurate three-dimensional (3D) blurring kernels both in homogenous and heterogeneous media to improve PET spatial resolution. Approach . In the proposed approach, positron energy deposition was approximately tracked along straight paths, depending on the positron stopping power of the underlying material. The positron stopping power was derived from the attenuation coefficient of 511 keV gamma photons according to the available PET attenuation maps. Thus, the history of energy deposition is taken into account within the range of kernels. Special emphasis was placed on facilitating the very fast computation of the positron annihilation probability in each voxel. Results . Positron path distributions of 18 F in low-density polyurethane were in high agreement with Geant4 simulation at an annihilation probability larger than 10 -2 ∼ 10 -3 of the maximum annihilation probability. The Geant4 simulation was further validated with measured 18 F depth profiles in these polyurethane phantoms. The tissue boundary of water with cortical bone and lung was correctly modeled. Residual artifacts from the numerical computations were in the range of 1%. The calculated annihilation probability in voxels shows an overall difference of less than 20% compared to the Geant4 simulation. Significance . The proposed method is expected to significantly improve spatial resolution for non-standard isotopes by providing sufficiently accurate range kernels, even in the case of significant tissue inhomogeneities., (Creative Commons Attribution license.)
Published: 2023
Full Text: View/download PDF

36. A detector block-pairwise dead time correction method for improved quantitation with a dedicated BrainPET scanner.

Author: Issa ASM, Scheins J, Tellmann L, Lopez-Montes A, Herraiz JL, Brambilla CR, Herzog H, Neuner I, Jon Shah N, and Lerche C
Subjects: Humans, Phantoms, Imaging, Image Processing, Computer-Assisted, Brain diagnostic imaging, Positron-Emission Tomography methods, Tomography, X-Ray Computed
Abstract: ' Objective . Dead time correction (DTC) is an important factor in ensuring accurate quantification in PET measurements. This is currently often achieved using a global DTC method, i.e., an average DTC factor is computed. For PET scanners designed to image dedicated organs, e.g., those used in brain imaging or positron emission mammography (PEM), a substantial amount of the administered radioactivity is located outside of the PET field-of-view (FOV). This activity contributes to the dead time (DT) of the scintillation detectors. Moreover, the count rates of the individual scintillation detectors are potentially very inhomogeneous due to the specific irradiation of each detector, especially for combined MR/PET systems, where radiation shields cannot be applied. Approach: We have developed a block-pairwise DTC method for our Siemens 3T MR BrainPET insert by extending a previously published method that uses the delayed random coincidence count rate to estimate the DT in the individual scans and planes (i.e., scintillation pixel rings). The method was validated in decay experiments using phantoms with a homogenous activity concentration and with and without out-of-FOV activity. Based on a three-compartment phantom, we compared the accuracy and noise properties of the block-pairwise DTC and the global DTC method. Main results . The currently used global DTC led to a substantial positive bias in regions with high activity; the block-pairwise DTC resulted in substantially less bias. The noise level for the block-pairwise DTC was comparable to the global DTC and image reconstructions without any DTC. Finally, we tested the block-pairwise DTC with a data set obtained from volunteer measurements using the mGluR5 (metabotropic glutamate receptor subtype 5) antagonist [ 11 C]ABP688. When the relative differences in activity concentrations obtained with global DTC and block-pairwise DTC for the ACC and the cerebellum GM were compared, the ratios differed by a factor of up to 1.4 at the beginning-when the first injection is administered as a bolus with high radioactivity. Significance . In this work, global DTC was shown to have the potential to introduce quantification bias, while better quantitation accuracy was achieved with the presented block-pairwise DTC method. The method can be implemented in all systems that use the delayed window technique and is particulary expected to improve the quantiation accuracy of dedicated brain PET scanners due to their geometry.', (Creative Commons Attribution license.)
Published: 2022
Full Text: View/download PDF

37. A Novel J-Shape Antenna Array for Simultaneous MR-PET or MR-SPECT Imaging.

Author: Choi CH, Hong SM, Felder J, Tellmann L, Scheins J, Kops ER, Lerche C, and Shah NJ
Subjects: Image Processing, Computer-Assisted methods, Phantoms, Imaging, Signal-To-Noise Ratio, Tomography, Emission-Computed, Single-Photon, Magnetic Resonance Imaging methods, Positron-Emission Tomography methods
Abstract: Simultaneous MR-PET/-SPECT is an emerging technology that capitalises on the invaluable advantages of both modalities, allowing access to numerous sensitive tracers and superior soft-tissue contrast alongside versatile functional imaging capabilities. However, to optimise these capabilities, concurrent acquisitions require the MRI antenna located inside the PET/SPECT field-of-view to be operated without compromising any aspects of system performance or image quality compared to the stand-alone instrumentation. Here, we report a novel gamma-radiation-transparent antenna concept. The end-fed J-shape antenna is particularly adept for hybrid ultra-high field MR-PET/-SPECT applications as it enables all highly attenuating materials to be placed outside the imaging field-of-view. Furthermore, this unique configuration also provides advantages in stand-alone MR applications by reducing the amount of coupling between the cables and the antenna elements, and by lowering the potential specific absorption rate burden. The use of this new design was experimentally verified according to the important features for both ultra-high field MRI and the 511 keV transmission scan. The reconstructed attenuation maps evidently showed much lower attenuation ( ∼ 15 %) for the proposed array when compared to the conventional dipole antenna array since there were no high-density components. In MR, it was observed that the signal-to-noise ratio from the whole volume obtained using the proposed array was comparable to that acquired by the conventional array which was also in agreement with the simulation results. The unique feature, J-shape array, would enable simultaneous MR-PET/-SPECT experiments to be conducted without unduly compromising any aspects of system performance and image quality compared to the stand-alone instrumentation.
Published: 2022
Full Text: View/download PDF

38. mGluR 5 and GABA A receptor-specific parametric PET atlas construction-PET/MR data processing pipeline, validation, and application.

Author: Kaulen N, Rajkumar R, Régio Brambilla C, Mauler J, Ramkiran S, Orth L, Sbaihat H, Lang M, Wyss C, Rota Kops E, Scheins J, Neumaier B, Ermert J, Herzog H, Langen KJ, Lerche C, Shah NJ, Veselinović T, and Neuner I
Subjects: Brain diagnostic imaging, Brain metabolism, Brain Mapping methods, Humans, Magnetic Resonance Imaging, Male, gamma-Aminobutyric Acid metabolism, Positron-Emission Tomography methods, Receptors, GABA-A metabolism
Abstract: The glutamate and γ-aminobutyric acid neuroreceptor subtypes mGluR 5 and GABA A are hypothesized to be involved in the development of a variety of psychiatric diseases. However, detailed information relating to their in vivo distribution is generally unavailable. Maps of such distributions could potentially aid clinical studies by providing a reference for the normal distribution of neuroreceptors and may also be useful as covariates in advanced functional magnetic resonance imaging (MR) studies. In this study, we propose a comprehensive processing pipeline for the construction of standard space, in vivo distributions of non-displaceable binding potential (BP ND ), and total distribution volume (V T ) based on simultaneously acquired bolus-infusion positron emission tomography (PET) and MR data. The pipeline was applied to [ 11 C]ABP688-PET/MR (13 healthy male non-smokers, 26.6 ± 7.0 years) and [ 11 C]Flumazenil-PET/MR (10 healthy males, 25.8 ± 3.0 years) data. Activity concentration templates, as well as V T and BP ND atlases of mGluR 5 and GABA A , were generated from these data. The maps were validated by assessing the percent error δ from warped space to native space in a selection of brain regions. We verified that the average δ ABP = 3.0 ± 1.0% and δ FMZ = 3.8 ± 1.4% were lower than the expected variabilities σ of the tracers (σ ABP = 4.0%-16.0%, σ FMZ = 3.9%-9.5%). An evaluation of PET-to-PET registrations based on the new maps showed higher registration accuracy compared to registrations based on the commonly used [ 15 O]H 2 O-template distributed with SPM12. Thus, we conclude that the resulting maps can be used for further research and the proposed pipeline is a viable tool for the construction of standardized PET data distributions., (© 2022 The Authors. Human Brain Mapping published by Wiley Periodicals LLC.)
Published: 2022
Full Text: View/download PDF

39. mGluR5 binding changes during a mismatch negativity task in a multimodal protocol with [ 11 C]ABP688 PET/MR-EEG.

Author: Régio Brambilla C, Veselinović T, Rajkumar R, Mauler J, Matusch A, Ruch A, Orth L, Ramkiran S, Sbaihat H, Kaulen N, Khudeish NY, Wyss C, Heekeren K, Kawohl W, Rota Kops E, Tellmann L, Scheins J, Boers F, Neumaier B, Ermert J, Lang M, Stüsgen S, Herzog H, Langen KJ, Shah NJ, Lerche CW, and Neuner I
Subjects: Carbon Radioisotopes, Electroencephalography, Humans, Oximes, Pyridines, Positron-Emission Tomography, Receptor, Metabotropic Glutamate 5
Abstract: Currently, the metabotropic glutamate receptor 5 (mGluR5) is the subject of several lines of research in the context of neurology and is of high interest as a target for positron-emission tomography (PET). Here, we assessed the feasibility of using [ 11 C]ABP688, a specific antagonist radiotracer for an allosteric site on the mGluR5, to evaluate changes in glutamatergic neurotransmission through a mismatch-negativity (MMN) task as a part of a simultaneous and synchronized multimodal PET/MR-EEG study. We analyzed the effect of MMN by comparing the changes in nondisplaceable binding potential (BP ND ) prior to (baseline) and during the task in 17 healthy subjects by applying a bolus/infusion protocol. Anatomical and functional regions were analyzed. A small change in BP ND was observed in anatomical regions (posterior cingulate cortex and thalamus) and in a functional network (precuneus) after the start of the task. The effect size was quantified using Kendall's W value and was 0.3. The motor cortex was used as a control region for the task and did not show any significant BP ND changes. There was a significant ΔBP ND between acquisition conditions. On average, the reductions in binding across the regions were - 8.6 ± 3.2% in anatomical and - 6.4 ± 0.5% in the functional network (p ≤ 0.001). Correlations between ΔBP ND and EEG latency for both anatomical (p = 0.008) and functional (p = 0.022) regions were found. Exploratory analyses suggest that the MMN task played a role in the glutamatergic neurotransmission, and mGluR5 may be indirectly modulated by these changes., (© 2021. The Author(s).)
Published: 2022
Full Text: View/download PDF

40. Comparison of EEG microstates with resting state fMRI and FDG-PET measures in the default mode network via simultaneously recorded trimodal (PET/MR/EEG) data.

Author: Rajkumar R, Farrher E, Mauler J, Sripad P, Régio Brambilla C, Rota Kops E, Scheins J, Dammers J, Lerche C, Langen KJ, Herzog H, Biswal B, Shah NJ, and Neuner I
Subjects: Adult, Biomarkers, Humans, Cerebral Cortex diagnostic imaging, Cerebral Cortex physiology, Connectome methods, Default Mode Network diagnostic imaging, Default Mode Network physiology, Electroencephalography methods, Magnetic Resonance Imaging methods, Multimodal Imaging methods, Positron-Emission Tomography methods
Abstract: Simultaneous trimodal positron emission tomography/magnetic resonance imaging/electroencephalography (PET/MRI/EEG) resting state (rs) brain data were acquired from 10 healthy male volunteers. The rs-functional MRI (fMRI) metrics, such as regional homogeneity (ReHo), degree centrality (DC) and fractional amplitude of low-frequency fluctuations (fALFFs), as well as 2-[18F]fluoro-2-desoxy-d-glucose (FDG)-PET standardised uptake value (SUV), were calculated and the measures were extracted from the default mode network (DMN) regions of the brain. Similarly, four microstates for each subject, showing the diverse functional states of the whole brain via topographical variations due to global field power (GFP), were estimated from artefact-corrected EEG signals. In this exploratory analysis, the GFP of microstates was nonparametrically compared to rs-fMRI metrics and FDG-PET SUV measured in the DMN of the brain. The rs-fMRI metrics (ReHO, fALFF) and FDG-PET SUV did not show any significant correlations with any of the microstates. The DC metric showed a significant positive correlation with microstate C (r s = 0.73, p = .01). FDG-PET SUVs indicate a trend for a negative correlation with microstates A, B and C. The positive correlation of microstate C with DC metrics suggests a functional relationship between cortical hubs in the frontal and occipital lobes. The results of this study suggest further exploration of this method in a larger sample and in patients with neuropsychiatric disorders. The aim of this exploratory pilot study is to lay the foundation for the development of such multimodal measures to be applied as biomarkers for diagnosis, disease staging, treatment response and monitoring of neuropsychiatric disorders., (© 2018 Wiley Periodicals, Inc.)
Published: 2021
Full Text: View/download PDF

41. A Linearized Fit Model for Robust Shape Parameterization of FET-PET TACs.

Author: Lerche CW, Radomski T, Lohmann P, Caldeira L, Brambilla CR, Tellmann L, Scheins J, Kops ER, Galldiks N, Langen KJ, Herzog H, and Jon Shah N
Subjects: Adult, Humans, Kinetics, Positron-Emission Tomography, Tyrosine, Brain Neoplasms diagnostic imaging, Glioma diagnostic imaging
Abstract: The kinetic analysis of [Formula: see text]-FET time-activity curves (TAC) can provide valuable diagnostic information in glioma patients. The analysis is most often limited to the average TAC over a large tissue volume and is normally assessed by visual inspection or by evaluating the time-to-peak and linear slope during the late uptake phase. Here, we derived and validated a linearized model for TACs of [Formula: see text]-FET in dynamic PET scans. Emphasis was put on the robustness of the numerical parameters and how reliably automatic voxel-wise analysis of TAC kinetics was possible. The diagnostic performance of the extracted shape parameters for the discrimination between isocitrate dehydrogenase (IDH) wildtype (wt) and IDH-mutant (mut) glioma was assessed by receiver-operating characteristic in a group of 33 adult glioma patients. A high agreement between the adjusted model and measured TACs could be obtained and relative, estimated parameter uncertainties were small. The best differentiation between IDH-wt and IDH-mut gliomas was achieved with the linearized model fitted to the averaged TAC values from dynamic FET PET data in the time interval 4-50 min p.i.. When limiting the acquisition time to 20-40 min p.i., classification accuracy was only slightly lower (-3%) and was comparable to classification based on linear fits in this time interval. Voxel-wise fitting was possible within a computation time ≈ 1 min per image slice. Parameter uncertainties smaller than 80% for all fits with the linearized model were achieved. The agreement of best-fit parameters when comparing voxel-wise fits and fits of averaged TACs was very high (p < 0.001).
Published: 2021
Full Text: View/download PDF

42. Evaluation of FET PET Radiomics Feature Repeatability in Glioma Patients.

Author: Gutsche R, Scheins J, Kocher M, Bousabarah K, Fink GR, Shah NJ, Langen KJ, Galldiks N, and Lohmann P
Abstract: Amino acid PET using the tracer O-(2-[ 18 F]fluoroethyl)-L-tyrosine (FET) has attracted considerable interest in neurooncology. Furthermore, initial studies suggested the additional diagnostic value of FET PET radiomics in brain tumor patient management. However, the conclusiveness of radiomics models strongly depends on feature generalizability. We here evaluated the repeatability of feature-based FET PET radiomics. A test-retest analysis based on equivalent but statistically independent subsamples of FET PET images was performed in 50 newly diagnosed and histomolecularly characterized glioma patients. A total of 1,302 radiomics features were calculated from semi-automatically segmented tumor volumes-of-interest (VOIs). Furthermore, to investigate the influence of the spatial resolution of PET on repeatability, spherical VOIs of different sizes were positioned in the tumor and healthy brain tissue. Feature repeatability was assessed by calculating the intraclass correlation coefficient (ICC). To further investigate the influence of the isocitrate dehydrogenase (IDH) genotype on feature repeatability, a hierarchical cluster analysis was performed. For tumor VOIs, 73% of first-order features and 71% of features extracted from the gray level co-occurrence matrix showed high repeatability (ICC 95% confidence interval, 0.91-1.00). In the largest spherical tumor VOIs, 67% of features showed high repeatability, significantly decreasing towards smaller VOIs. The IDH genotype did not affect feature repeatability. Based on 297 repeatable features, two clusters were identified separating patients with IDH-wildtype glioma from those with an IDH mutation. Our results suggest that robust features can be obtained from routinely acquired FET PET scans, which are valuable for further standardization of radiomics analyses in neurooncology.
Published: 2021
Full Text: View/download PDF

43. Bias evaluation and reduction in 3D OP-OSEM reconstruction in dynamic equilibrium PET studies with 11C-labeled for binding potential analysis.

Author: Brambilla CR, Scheins J, Issa A, Tellmann L, Herzog H, Rota Kops E, Shah NJ, Neuner I, and Lerche CW
Subjects: Isotope Labeling, Phantoms, Imaging, Carbon Radioisotopes, Imaging, Three-Dimensional methods, Positron-Emission Tomography
Abstract: Iterative image reconstruction is widely used in positron emission tomography. However, it is known to contribute to quantitation bias and is particularly pronounced during dynamic studies with 11C-labeled radiotracers where count rates become low towards the end of the acquisition. As the strength of the quantitation bias depends on the counts in the reconstructed frame, it can differ from frame to frame of the acquisition. This is especially relevant in the case of neuro-receptor studies with simultaneous PET/MR when a bolus-infusion protocol is applied to allow the comparison of pre- and post-task effects. Here, count dependent changes in quantitation bias may interfere with task changes. We evaluated the impact of different framing schemes on quantitation bias and its propagation into binding potential (BP) using a phantom decay study with 11C and 3D OP-OSEM. Further, we propose a framing scheme that keeps the true counts per frame constant over the acquisition time as constant framing schemes and conventional increasing framing schemes are unlikely to achieve stable bias values during the acquisition time range. For a constant framing scheme with 5 minutes frames, the BP bias was 7.13±2.01% (10.8% to 3.8%) compared to 5.63±2.85% (7.8% to 4.0%) for conventional increasing framing schemes. Using the proposed constant true counts framing scheme, a stabilization of the BP bias was achieved at 2.56±3.92% (3.5% to 1.7%). The change in BP bias was further studied by evaluating the linear slope during the acquisition time interval. The lowest slope values were observed in the constant true counts framing scheme. The constant true counts framing scheme was effective for BP bias stabilization at relevant activity and time ranges. The mean BP bias under these conditions was 2.56±3.92%, which represents the lower limit for the detection of changes in BP during equilibrium and is especially important in the case of cognitive tasks where the expected changes are low., Competing Interests: The authors have declared that no competing interests exist.
Published: 2021
Full Text: View/download PDF

44. Excitatory-inhibitory balance within EEG microstates and resting-state fMRI networks: assessed via simultaneous trimodal PET-MR-EEG imaging.

Author: Rajkumar R, Régio Brambilla C, Veselinović T, Bierbrier J, Wyss C, Ramkiran S, Orth L, Lang M, Rota Kops E, Mauler J, Scheins J, Neumaier B, Ermert J, Herzog H, Langen KJ, Binkofski FC, Lerche C, Shah NJ, and Neuner I
Subjects: Brain diagnostic imaging, Electroencephalography, Positron-Emission Tomography, Brain Mapping, Magnetic Resonance Imaging
Abstract: The symbiosis of neuronal activities and glucose energy metabolism is reflected in the generation of functional magnetic resonance imaging (fMRI) and electroencephalography (EEG) signals. However, their association with the balance between neuronal excitation and inhibition (E/I-B), which is closely related to the activities of glutamate and γ-aminobutyric acid (GABA) and the receptor availability (RA) of GABA A and mGluR5, remains unexplored. This research investigates these associations during the resting state (RS) condition using simultaneously recorded PET/MR/EEG (trimodal) data. The trimodal data were acquired from three studies using different radio-tracers such as, [ 11 C]ABP688 (ABP) (N = 9), [ 11 C]Flumazenil (FMZ) (N = 10) and 2-[ 18 F]fluoro-2-deoxy-D-glucose (FDG) (N = 10) targeted to study the mGluR5, GABA A receptors and glucose metabolism respectively. Glucose metabolism and neuroreceptor binding availability (non-displaceable binding potential (BP ND )) of GABA A and mGluR5 were found to be significantly higher and closely linked within core resting-state networks (RSNs). The neuronal generators of EEG microstates and the fMRI measures were most tightly associated with the BP ND of GABA A relative to mGluR5 BP ND and the glucose metabolism, emphasising a predominance of inhibitory processes within in the core RSNs at rest. Changes in the neuroreceptors leading to an altered coupling with glucose metabolism may render the RSNs vulnerable to psychiatric conditions. The paradigm employed here will likely help identify the precise neurobiological mechanisms behind these alterations in fMRI functional connectivity and EEG oscillations, potentially benefitting individualised healthcare treatment measures.
Published: 2021
Full Text: View/download PDF

45. Bolus infusion scheme for the adjustment of steady state [ 11 C]Flumazenil levels in the grey matter and in the blood plasma for neuroreceptor imaging.

Author: Mauler J, Heinzel A, Matusch A, Herzog H, Neuner I, Scheins J, Wyss C, Dammers J, Lang M, Ermert J, Neumaier B, Langen KJ, and Shah NJ
Subjects: Adult, Humans, Male, Multimodal Imaging, Young Adult, Carbon Radioisotopes administration & dosage, Flumazenil administration & dosage, Flumazenil blood, Flumazenil pharmacokinetics, GABA Modulators administration & dosage, GABA Modulators blood, GABA Modulators pharmacokinetics, Gray Matter diagnostic imaging, Gray Matter drug effects, Gray Matter metabolism, Magnetic Resonance Imaging, Positron-Emission Tomography, Sensory Receptor Cells drug effects, Sensory Receptor Cells metabolism, White Matter diagnostic imaging, White Matter drug effects, White Matter metabolism
Abstract: The use of hybrid PET/MR imaging facilitates the simultaneous investigation of challenge-related changes in ligand binding to neuroreceptors using PET, while concurrently measuring neuroactivation or blood flow with MRI. Having attained a steady state of the PET radiotracer using a bolus-infusion protocol, it is possible to observe alterations in ligand neuroreceptor binding through changes in distribution volumes. Here, we present an iterative procedure for establishing an administration scheme to obtain steady state [ 11 C]flumazenil concentrations in grey matter in the human brain. In order to achieve a steady state in the shortest possible time, the bolus infusion ratio from a previous examination was adapted to fit the subsequent examination. 17 male volunteers were included in the study. Boli and infusions with different weightings were given to the subjects and were characterised by kbol values from 74 min down to 42 min. Metabolite analysis was used to ascertain the value of unmetabolised flumazenil in the plasma, and PET imaging was used to assess its binding in the grey matter. The flumazenil time-activity curves (TACs) in the brain were decomposed into activity contributions from pure grey and white matter and analysed for 12 vol of interest (VOIs). The curves highlighted a large variability in metabolic rates between the subjects, with kbol = 54.3 min being a reliable value to provide flumazenil equilibrium conditions in the majority of the VOIs and cases. The distribution volume of flumazenil in all 12 VOIs was determined., Competing Interests: Declaration of competing interest There are no known conflicts of interest., (Copyright © 2020 The Author(s). Published by Elsevier Inc. All rights reserved.)
Published: 2020
Full Text: View/download PDF

46. mGluR5 receptor availability is associated with lower levels of negative symptoms and better cognition in male patients with chronic schizophrenia.

Author: Régio Brambilla C, Veselinović T, Rajkumar R, Mauler J, Orth L, Ruch A, Ramkiran S, Heekeren K, Kawohl W, Wyss C, Kops ER, Scheins J, Tellmann L, Boers F, Neumaier B, Ermert J, Herzog H, Langen KJ, Jon Shah N, Lerche C, and Neuner I
Subjects: Adult, Chronic Disease, Humans, Male, Middle Aged, Neuropsychological Tests, Oximes pharmacokinetics, Positron-Emission Tomography, Pyridines pharmacokinetics, Smoking metabolism, Caudate Nucleus diagnostic imaging, Caudate Nucleus metabolism, Caudate Nucleus physiopathology, Cognitive Dysfunction etiology, Cognitive Dysfunction metabolism, Cognitive Dysfunction physiopathology, Receptor, Metabotropic Glutamate 5 metabolism, Schizophrenia complications, Schizophrenia metabolism, Schizophrenia physiopathology, Temporal Lobe diagnostic imaging, Temporal Lobe metabolism, Temporal Lobe physiopathology
Abstract: Consistent findings postulate disturbed glutamatergic function (more specifically a hypofunction of the ionotropic NMDA receptors) as an important pathophysiologic mechanism in schizophrenia. However, the role of the metabotropic glutamatergic receptors type 5 (mGluR5) in this disease remains unclear. In this study, we investigated their significance (using [ 11 C]ABP688) for psychopathology and cognition in male patients with chronic schizophrenia and healthy controls. In the patient group, lower mGluR5 binding potential (BP ND ) values in the left temporal cortex and caudate were associated with higher general symptom levels (negative and depressive symptoms), lower levels of global functioning and worse cognitive performance. At the same time, in both groups, mGluR5 BP ND were significantly lower in smokers (F [27,1] = 15.500; p = .001), but without significant differences between the groups. Our findings provide support for the concept that the impaired function of mGluR5 underlies the symptoms of schizophrenia. They further supply a new perspective on the complex relationship between tobacco addiction and schizophrenia by identifying glutamatergic neurotransmission-in particularly mGluR5-as a possible connection to a shared vulnerability., (© 2020 The Authors. Human Brain Mapping published by Wiley Periodicals, Inc.)
Published: 2020
Full Text: View/download PDF

47. Scatter Correction Based on GPU-Accelerated Full Monte Carlo Simulation for Brain PET/MRI.

Author: Ma B, Gaens M, Caldeira L, Bert J, Lohmann P, Tellmann L, Lerche C, Scheins J, Rota Kops E, Xu H, Lenz M, Pietrzyk U, and Shah NJ
Subjects: Algorithms, Brain Neoplasms diagnostic imaging, Equipment Design, Humans, Imaging, Three-Dimensional methods, Monte Carlo Method, Phantoms, Imaging, Brain diagnostic imaging, Magnetic Resonance Imaging methods, Positron-Emission Tomography methods
Abstract: Accurate scatter correction is essential for qualitative and quantitative PET imaging. Until now, scatter correction based on Monte Carlo simulation (MCS) has been recognized as the most accurate method of scatter correction for PET. However, the major disadvantage of MCS is its long computational time, which makes it unfeasible for clinical usage. Meanwhile, single scatter simulation (SSS) is the most widely used method for scatter correction. Nevertheless, SSS has the disadvantage of limited robustness for dynamic measurements and for the measurement of large objects. In this work, a newly developed implementation of MCS using graphics processing unit (GPU) acceleration is employed, allowing full MCS-based scatter correction in clinical 3D brain PET imaging. Starting from the generation of annihilation photons to their detection in the simulated PET scanner, all relevant physical interactions and transport phenomena of the photons were simulated on GPUs. This resulted in an expected distribution of scattered events, which was subsequently used to correct the measured emission data. The accuracy of the approach was validated with simulations using GATE (Geant4 Application for Tomography Emission), and its performance was compared to SSS. The comparison of the computation time between a GPU and a single-threaded CPU showed an acceleration factor of 776 for a voxelized brain phantom study. The speedup of the MCS implemented on the GPU represents a major step toward the application of the more accurate MCS-based scatter correction for PET imaging in clinical routine.
Published: 2020
Full Text: View/download PDF

48. Resolution modeling in projection space using a factorized multi-block detector response function for PET image reconstruction.

Author: Xu H, Lenz M, Caldeira L, Ma B, Pietrzyk U, Lerche C, Shah NJ, and Scheins J
Subjects: Computer Simulation, Humans, Algorithms, Brain diagnostic imaging, Image Processing, Computer-Assisted methods, Phantoms, Imaging, Positron-Emission Tomography instrumentation, Positron-Emission Tomography methods
Abstract: Positron emission tomography (PET) images usually suffer from limited resolution and statistical uncertainties. However, a technique known as resolution modeling (RM) can be used to improve image quality by accurately modeling the system's detection process within the iterative reconstruction. In this study, we present an accurate RM method in projection space based on a simulated multi-block detector response function (DRF) and evaluate it on the Siemens hybrid MR-BrainPET system. The DRF is obtained using GATE simulations that consider nearly all the possible annihilation photons from the field-of-view (FOV). Intrinsically, the multi-block DRF allows the block crosstalk to be modeled. The RM blurring kernel is further generated by factorizing the blurring matrix of one line-of-response (LOR) into two independent detector responses, which can then be addressed with the DRF. Such a kernel is shift-variant in 4D projection space without any distance or angle compression, and is integrated into the image reconstruction for the BrainPET insert with single instruction multiple data (SIMD) and multi-thread support. Evaluation of simulations and measured data demonstrate that the reconstruction with RM yields significantly improved resolutions and reduced mean squared error (MSE) values at different locations of the FOV, compared with reconstruction without RM. Furthermore, the shift-variant RM kernel models the varying blurring intensity for different LORs due to the depth-of-interaction (DOI) dependencies, thus avoiding severe edge artifacts in the images. Additionally, compared to RM in single-block mode, the multi-block mode shows significantly improved resolution and edge recovery at locations beyond 10 cm from the center of BrainPET insert in the transverse plane. However, the differences have been observed to be low for patient data between single-block and multi-block mode RM, due to the brain size and location as well as the geometry of the BrainPET insert. In conclusion, the RM method proposed in this study can yield better reconstructed images in terms of resolution and MSE value, compared to conventional reconstruction without RM.
Published: 2019
Full Text: View/download PDF

49. Corrigendum to "TRIMAGE: A dedicated trimodality (PET/MR/EEG) imaging tool for schizophrenia" [Eur Psychiatry 50 (2018) 7-20].

Author: Del Guerra A, Ahmad S, Avram M, Belcari N, Berneking A, Biagi L, Bisogni MG, Brandl F, Cabello J, Camarlinghi N, Cerello P, Choi CH, Coli S, Colpo S, Fleury J, Gagliardi V, Giraudo G, Heekeren K, Kawohl W, Kostou T, Lefaucheur JL, Lerche C, Loudos G, Morrocchi M, Muller J, Mustafa M, Neuner I, Papadimitroulas P, Pennazio F, Rajkumar R, Brambilla CR, Rivoire J, Kops ER, Scheins J, Schimpf R, Shah NJ, Sorg C, Sportelli G, Tosetti M, Trinchero R, Wyss C, and Ziegler S
Published: 2018
Full Text: View/download PDF

50. TRIMAGE: A dedicated trimodality (PET/MR/EEG) imaging tool for schizophrenia.

Author: Del Guerra A, Ahmad S, Avram M, Belcari N, Berneking A, Biagi L, Bisogni MG, Brandl F, Cabello J, Camarlinghi N, Cerello P, Choi CH, Coli S, Colpo S, Fleury J, Gagliardi V, Giraudo G, Heekeren K, Kawohl W, Kostou T, Lefaucheur JL, Lerche C, Loudos G, Morrocchi M, Muller J, Mustafa M, Neuner I, Papadimitroulas P, Pennazio F, Rajkumar R, Brambilla CR, Rivoire J, Kops ER, Scheins J, Schimpf R, Shah NJ, Sorg C, Sportelli G, Tosetti M, Trinchero R, Wyss C, and Ziegler S
Subjects: Adult, Female, Humans, Image Processing, Computer-Assisted, Male, Middle Aged, Brain diagnostic imaging, Electroencephalography methods, Magnetic Resonance Spectroscopy methods, Multimodal Imaging methods, Positron-Emission Tomography methods, Schizophrenia diagnostic imaging
Abstract: Simultaneous PET/MR/EEG (Positron Emission Tomography - Magnetic Resonance - Electroencephalography), a new tool for the investigation of neuronal networks in the human brain, is presented here within the framework of the European Union Project TRIMAGE. The trimodal, cost-effective PET/MR/EEG imaging tool makes use of cutting edge technology both in PET and in MR fields. A novel type of magnet (1.5T, non-cryogenic) has been built together with a PET scanner that makes use of the most advanced photodetectors (i.e., SiPM matrices), scintillators matrices (LYSO) and digital electronics. The combined PET/MR/EEG system is dedicated to brain imaging and has an inner diameter of 260 mm and an axial Field-of-View of 160 mm. It enables the acquisition and assessment of molecular metabolic information with high spatial and temporal resolution in a given brain simultaneously. The dopaminergic system and the glutamatergic system in schizophrenic patients are investigated via PET, the same physiological/pathophysiological conditions with regard to functional connectivity, via fMRI, and its electrophysiological signature via EEG. In addition to basic neuroscience questions addressing neurovascular-metabolic coupling, this new methodology lays the foundation for individual physiological and pathological fingerprints for a wide research field addressing healthy aging, gender effects, plasticity and different psychiatric and neurological diseases. The preliminary performances of two components of the imaging tool (PET and MR) are discussed. Initial results of the search of possible candidates for suitable schizophrenia biomarkers are also presented as obtained with PET/MR systems available to the collaboration., (Copyright © 2017 Elsevier Masson SAS. All rights reserved.)
Published: 2018
Full Text: View/download PDF

Catalog

Books, media, physical & digital resources

See catalog results

Searchworks

Select search scope, currently: Articles Catalog books, media & more in Jio Institute collections Articles journal articles & other e-resources

Search

Search Constraints

Refine your results

Search Limiters

Topic

Publication Year Range

Language

Publication Type

Journal

Database

Publisher

62 results on '"J. Scheins"'

Search Results

Catalog

Select search scope, currently: Articles

Catalog

books, media & more in Jio Institute collections

Articles

journal articles & other e-resources