Search

Your search keyword '"Klaus Desch"' showing total 85 results
Start Over Author "Klaus Desch"
85 results on '"Klaus Desch"'

1. Considerations on Possible Directions for a Wide Band Polarimetry X-ray Mission

Author

Paolo Soffitta, Enrico Costa, Nicolas De Angelis, Ettore Del Monte, Klaus Desch, Alessandro Di Marco, Giuseppe Di Persio, Sergio Fabiani, Riccardo Ferrazzoli, Markus Gruber, Takahashi Hiromitsu, Saba Imtiaz, Philip Kaaret, Jochen Kaminski, Dawoon E. Kim, Fabian Kislat, Henric Krawczynski, Fabio La Monaca, Carlo Lefevre, Hemanth Manikantan, Herman L. Marshall, Romana Mikusincova, Alfredo Morbidini, Fabio Muleri, Stephen L. O’Dell, Takashi Okajima, Mark Pearce, Vladislavs Plesanovs, Brian D. Ramsey, Ajay Ratheesh, Alda Rubini, Shravan Vengalil Menon, and Martin C. Weisskopf

Subjects
X-rays, astronomy, polarimetry, Astronomy, QB1-991
Abstract

The Imaging X-ray Polarimetry Explorer (IXPE) has confirmed that X-ray polarimetry is a valuable tool in astronomy, providing critical insights into the emission processes and the geometry of compact objects. IXPE was designed to be sensitive in the 2–8 keV energy range for three primary reasons: (1) celestial X-ray sources are bright within this range, (2) the optics are effective, and (3) most sources across various classes were expected to exhibit some level of polarization. Indeed, IXPE is a great success, and its discoveries are necessitating the revision of many theoretical models for numerous sources. However, one of IXPE’s main limitations is its relatively narrow energy band, coupled with rapidly declining efficiency. In this paper, we will demonstrate the benefits of devising a mission focused on a broader energy band (0.1–79 keV). This approach leverages current technologies that align well with theoretical expectations and builds on the successes of IXPE.

Published
2024
Full Text
View/download PDF

3. Particle Physics Readout Electronics and Novel Detector Technologies for Neutron Science

Author

Thomas Block, Markus Gruber, Saime Gurbuz, Jochen Kaminski, Michael Lupberger, Divya Pal, Laura Rodriguez Gomez, Patrick Schwaebig, and Klaus Desch

Subjects
Nuclear and High Energy Physics, High Energy Physics - Experiment (hep-ex), Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, FOS: Physical sciences, High Energy Physics::Experiment, Instrumentation and Detectors (physics.ins-det), Nuclear Experiment (nucl-ex), Instrumentation, Nuclear Experiment, High Energy Physics - Experiment
Abstract

Traditional thermal neutron detectors are based on Helium-3 as conversion and detection material due to its large neutron cross-section. In light of the upgrade and construction of several neutron scattering facilities such as the European Spallation Source (ESS) and a simultaneous shortage of Helium-3, new detection technologies have been introduced. The most prominent one is to use solid converts with a large thermal neutron cross-section such as Gadolinium and Boron. Those materials emit charged particles when hit by a neutron. The technique then relies on detection and/or tracking of the charged particle, as in detectors of particle physics. At the same time, this requires an increase of the readout channels by an order of magnitude with the advantage of also increasing the position resolution by the same amount compared to traditional neutron detectors. A prime example is the Gadolinium Gas Electron Multiplier (GdGEM) detector for the NMX instrument at ESS jointly developed by the CERN Gaseous Detector Group and the ESS Detector Group. In this contribution, some of our efforts to transfer particle physics detectors and readout electronics to neutron science will be presented. We employed the VMM3a chip, originally designed for the ATLAS New Small Wheel upgrade, to read out a GEM-based neutron detector. The Timepix3 chip is employed in a neutron Time Projection Chamber as well as to read out a neutron-sensitive Micro-Channel Plate detector. Those readout chips are integrated into the Scalable Readout System of the RD51 collaboration.

Published
2022

4. An automated testing system for the RD51 VMM hybrid and yield measurement of the first production batches

Author

Finn Jaekel, Klaus Desch, Jochen Kaminski, Michael Lupberger, Lucian Scharenberg, and Patrick Schwaebig

Subjects
Nuclear and High Energy Physics, High Energy Physics - Experiment (hep-ex), Physics - Instrumentation and Detectors, FOS: Physical sciences, Nuclear Physics - Experiment, Instrumentation and Detectors (physics.ins-det), Nuclear Experiment (nucl-ex), Detectors and Experimental Techniques, Instrumentation, Nuclear Experiment, Particle Physics - Experiment, High Energy Physics - Experiment
Abstract

We present the development of an automated testing system for the VMM hybrid of the RD51 collaboration. The VMM hybrid is a new front-end board for the RD51 common readout system, the Scalable Readout System, and will become the workhorse for the next decade to read out Micro-Pattern Gaseous Detectors. It uses the VMM chip developed for the ATLAS New Small Wheel to convert charge signals from detectors to digital data. Our testing system automatically characterises the quality of the VMM chips on the hybrid after production during multiple tests. Results are evaluated to classify the chips and hybrids and uploaded to a database. We evaluated those results for the first two production batches to measure the production yield. The yield is better than the threshold below which chip testing on a wafer level offers financial benefits. Observations on prominent chip failures were propagated back to the hybrid production process to further increase the yield for future productions. We present the development of an automated testing system for the VMM hybrid of the RD51 collaboration. The VMM hybrid is a new front-end board for the RD51 common readout system, the Scalable Readout System, and will become the workhorse for the next decade to read out Micro-Pattern Gaseous Detectors. It uses the VMM chip developed for the ATLAS New Small Wheel to convert charge signals from detectors to digital data. Our testing system automatically characterises the quality of the VMM chips on the hybrid after production during multiple tests. Results are evaluated to classify the chips and hybrids and uploaded to a database. We evaluated those results for the first two production batches to measure the production yield. The yield is better than the threshold below which chip testing on a wafer level offers financial benefits. Observations on prominent chip failures were propagated back to the hybrid production process to further increase the yield for future productions.

Published
2022
Full Text
View/download PDF

5. SUSY Les Houches Accord 2.

Author

Benjamin C. Allanach, Csaba Balázs, Geneviève Bélanger, M. Bernhardt, Fawzi Boudjema, D. Choudhury, Klaus Desch, Ulrich Ellwanger, Paolo Gambino, R. Godbole, T. Goto, Jaume Guasch, M. Guchait, Thomas Hahn, Sven Heinemeyer, Cyril Hugonie, T. Hurth, Sabine Kraml, Sven Kreiss, and J. Lykken

Published
2009
Full Text
View/download PDF

6. Development of a GridPix X-ray polarimeter

Author

Markus Gruber, Klaus Desch, Jochen Kaminski, and Leonie Richarz

Subjects
History, Computer Science Applications, Education
Abstract

In gaseous detectors it is possible to determine the polarization of an X-ray beam by tracking photoelectrons which are created in photoelectric interactions of the photons with the gas molecules. Based on the differential cross section of this interaction the emission angle of the photoelectrons is correlated with the polarization plane of the beam. Depending on the photon energy and on scattering of the photoelectrons on gas molecules the length of the relevant part of the track is only in the order of a few hundred microns. Thus, a high tracking resolution is needed. This is achieved with the GridPix [1] - a combination of the highly granular Timepix pixel ASIC [2] and a photolithographically postprocessed MicroMegas called InGrid which holes are aligned with the pixels of the ASIC. Such a detector was operated in a testbeam at the P09 beamline [3] of PETRA III with a 99% linear polarized beam and a modulation factor of 77% was measured. Furthermore, tests of different gas pressures and different beam energies were performed.

Published
2022

7. A Bottom-up approach to Grid-Computing at a University: the Black-Forest-Grid Initiative.

Author

Rolf Backofen, Hans-Gunther Borrmann, Werner Deck, Andreas Dedner, Luc De Raedt, Klaus Desch, Markus Diesmann, Martin Geier, Andreas Greiner, Wolfgang R. Hess, Josef Honerkamp, Stefan Jankowski, Ingo Krossing, Andreas W. Liehr, Andreas Karwath, Robert Klöfkorn, Raphaël Pesché, Tobias C. Potjans, Michael C. Röttger, Lars Schmidt-Thieme, Gerhard Schneider 0001, Björn Voß, Bernd Wiebelt, Peter Wienemann, and Volker-Henning Winterer

Published
2006
Full Text
View/download PDF

9. Simple and statistically sound recommendations for analysing physical theories

Author

Shehu S AbdusSalam, Fruzsina J Agocs, Benjamin C Allanach, Peter Athron, Csaba Balázs, Emanuele Bagnaschi, Philip Bechtle, Oliver Buchmueller, Ankit Beniwal, Jihyun Bhom, Sanjay Bloor, Torsten Bringmann, Andy Buckley, Anja Butter, José Eliel Camargo-Molina, Marcin Chrzaszcz, Jan Conrad, Jonathan M Cornell, Matthias Danninger, Jorge de Blas, Albert De Roeck, Klaus Desch, Matthew Dolan, Herbert Dreiner, Otto Eberhardt, John Ellis, Ben Farmer, Marco Fedele, Henning Flächer, Andrew Fowlie, Tomás E Gonzalo, Philip Grace, Matthias Hamer, Will Handley, Julia Harz, Sven Heinemeyer, Sebastian Hoof, Selim Hotinli, Paul Jackson, Felix Kahlhoefer, Kamila Kowalska, Michael Krämer, Anders Kvellestad, Miriam Lucio Martinez, Farvah Mahmoudi, Diego Martinez Santos, Gregory D Martinez, Satoshi Mishima, Keith Olive, Ayan Paul, Markus Tobias Prim, Werner Porod, Are Raklev, Janina J Renk, Christopher Rogan, Leszek Roszkowski, Roberto Ruiz de Austri, Kazuki Sakurai, Andre Scaffidi, Pat Scott, Enrico Maria Sessolo, Tim Stefaniak, Patrick Stöcker, Wei Su, Sebastian Trojanowski, Roberto Trotta, Yue-Lin Sming Tsai, Jeriek Van den Abeele, Mauro Valli, Aaron C Vincent, Georg Weiglein, Martin White, Peter Wienemann, Lei Wu, Yang Zhang, Athron, Peter [0000-0003-2966-5914], Balázs, Csaba [0000-0001-7154-1726], Fowlie, Andrew [0000-0001-5457-6329], Hoof, Sebastian [0000-0002-3517-2561], and Apollo - University of Cambridge Repository

Subjects
Astrophysics and Astronomy, Cosmology and Nongalactic Astrophysics (astro-ph.CO), hep-ex, Other Fields of Physics, FOS: Physical sciences, General Physics and Astronomy, hep-ph, methodology, High Energy Physics - Experiment, physics.data-an, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), statistics, Physics - Data Analysis, Statistics and Probability, astro-ph.CO, particle physics, Data Analysis, Statistics and Probability (physics.data-an), Particle Physics - Experiment, Particle Physics - Phenomenology, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

Physical theories that depend on many parameters or are tested against data from many different experiments pose unique challenges to statistical inference. Many models in particle physics, astrophysics and cosmology fall into one or both of these categories. These issues are often sidestepped with statistically unsound ad hoc methods, involving intersection of parameter intervals estimated by multiple experiments, and random or grid sampling of model parameters. Whilst these methods are easy to apply, they exhibit pathologies even in low-dimensional parameter spaces, and quickly become problematic to use and interpret in higher dimensions. In this article we give clear guidance for going beyond these procedures, suggesting where possible simple methods for performing statistically sound inference, and recommendations of readily-available software tools and standards that can assist in doing so. Our aim is to provide any physicists lacking comprehensive statistical training with recommendations for reaching correct scientific conclusions, with only a modest increase in analysis burden. Our examples can be reproduced with the code publicly available at https://doi.org/10.5281/zenodo.4322283., 15 pages, 4 figures. extended discussions. closely matches version accepted for publication

Published
2020

10. How alive is constrained SUSY really?

Author

Tim Stefaniak, Bjorn Sarrazin, Herbert K. Dreiner, Peter Wienemann, Mathias Uhlenbrock, Ben O'Leary, Philip Bechtle, Klaus Desch, Matthias Hamer, Michael Kramer, and Werner Porod

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, 010308 nuclear & particles physics, Physics beyond the Standard Model, High Energy Physics::Phenomenology, FOS: Physical sciences, Supersymmetry, 01 natural sciences, Supersymmetry breaking, Bayesian statistics, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Frequentist inference, supersymmetry phenomenology, 0103 physical sciences, Higgs boson, LHC, 010306 general physics, Minimal Supersymmetric Standard Model
Abstract

Constrained supersymmetric models like the CMSSM might look less attractive nowadays because of fine tuning arguments. They also might look less probable in terms of Bayesian statistics. The question how well the model under study describes the data, however, is answered by frequentist p-values. Thus, for the first time, we calculate a p-value for a supersymmetric model by performing dedicated global toy fits. We combine constraints from low-energy and astrophysical observables, Higgs boson mass and rate measurements as well as the non-observation of new physics in searches for supersymmetry at the LHC. Using the framework Fittino, we perform global fits of the CMSSM to the toy data and find that this model is excluded at more than 95% confidence level., 6 pages, 7 figures; To appear in the Proceedings of the 37th International Conference on High Energy Physics (ICHEP 2014), 2-9 July 2014, Valencia, Spain

Published
2016

11. Search for invisibly decaying Higgs bosons in e+e−→Z0h0 production at s=183–209 GeV

Author

A. J. Martin, M. Ford, M. Boutemeur, F. S. Merritt, D. E. Plane, P. Scharff-Hansen, J. von Krogh, W. Mader, R. J. Hawkings, A. Harel, Ikuo Ueda, D. M. Strom, J. Lu, Ehud Duchovni, A. M. Smith, J. A. McKenna, Kiyotomo Kawagoe, Daniel Lellouch, Tara Shears, A. Michelini, J. Dubbert, Robert Vertesi, R. K. Carnegie, J. A. Wilson, Takehiko Mori, M. Schumacher, Gideon Bella, Andris Skuja, Robert McPherson, T. Kobayashi, M. Przybycień, A. Ludwig, A. D. Schaile, Gabriella Pasztor, D. Axen, A. A. Carter, Richard Teuscher, Oana Elena Vickey Boeriu, M. Verzocchi, P. F. Åkesson, Giovanni Abbiendi, P. J. Bell, H. J. Burckhart, R. M. Brown, T. R. Junk, Tetsuro Mashimo, M. F. Turner-Watson, P. Vannerem, Fabrizio Fabbri, A. Frey, E. A. De Wolf, F. Spano, P. S. Wells, Lorne Levinson, Peter Sherwood, Terry Richard Wyatt, A. T. Watson, J. Lillich, Matthias Schröder, B. W. Kennedy, C. P. Ward, G. W. Wilson, I. R. Bailey, P. Jovanovic, Christoph Geich-Gimbel, J. Ludwig, M. Hauschild, M. Hamann, N. Meyer, Klaus Rabbertz, L. Zivkovic, K. Runge, P. Bock, Peter Krieger, J. M. Roney, S. Söldner-Rembold, S. W. O'Neale, W. Menges, Otmar Biebel, M. Kupper, H. Nanjo, R. J. Sobie, Stephen Lloyd, Joost Vossebeld, Oliver Pooth, Klaus Desch, T. Schörner-Sadenius, Koichi Nagai, C. F. Vollmer, Attila Krasznahorkay, E. Torrence, A. Gupta, Yoram Rozen, W. Mohr, H. Mes, I. P. Duerdoth, Shlomo Dado, Jochen Schieck, K. J. Anderson, Thorsten Wengler, T. Behnke, D. J. Miller, G. Mikenberg, Norbert Wermes, Junichi Kanzaki, James Pinfold, A. Quadt, R. Seuster, M. A. Thomson, Marco Cuffiani, Gideon Alexander, Paolo Capiluppi, T. Kawamoto, E. K. U. Gross, R. J. Batley, Dave Charlton, H. Voss, R. J. Barlow, S. Orito, H. Landsman, C. Y. Chang, Teresa Barillari, Satoru Yamashita, Gabriele Benelli, P. Gagnon, A. Csilling, R. D. Heuer, M. J. Oreglia, E. L. Barberio, S. Braibant, E. Tsur, C. M. Hawkes, Zoltan Laszlo Trocsanyi, Isabel Marian Trigger, K. W. Bell, P. Mättig, Shoji Asai, Gregor Herten, J. C. Hill, Balazs Ujvari, Tobias Kramer, J. E. Pilcher, B. C. Shen, Siegfried Bethke, I. Nakamura, J. W. Gary, Raimund Ströhmer, Marek Tasevsky, Dezso Horvath, R. G. Kellogg, Beatrix Dienes, Alexander Oh, D. Lanske, Csaba Hajdu, J. Goldberg, Stefano Marcellini, Christoph Rembser, Gunter Wolf, James Letts, D. Karlen, D. Zer-Zion, F. K. Loebinger, Erez Etzion, Ivor Fleck, Stefan Kluth, Shlomit Tarem, Joleen Pater, M. Giunta, Edward K. G. Sarkisyan, D. Toya, H. A. Neal, Sachio Komamiya, M. Gruwe, T. Saeki, A. Mutter, J. Grunhaus, Gordon H. Hanson, G. Giacomelli, A. De Roeck, M. Kobel, Frans Meijers, Alain Bellerive, P. Igo-Kemenes, K. Ishii, H. Jeremie, G. Anagnostou, O. Schaile, T. Kuhl, Pamela Ferrari, Paolo Giacomelli, Claudia Ciocca, K. Sachs, J. R. Carter, Philip Bechtle, N. K. Watson, Achim Stahl, C. Ainsley, C. Pahl, A. M. Rossi, G. D. Lafferty, R. K. Keeler, P. M. Watkins, P. Renkel, S. Campana, Guenter Duckeck, Satoshi Mihara, Frank Fiedler, and D. R. Ward

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Electron–positron annihilation, High Energy Physics::Phenomenology, Elementary particle, 01 natural sciences, Standard Model, Vector boson, Nuclear physics, 0103 physical sciences, Neutralino, Higgs boson, High Energy Physics::Experiment, 010306 general physics, Minimal Supersymmetric Standard Model, Boson
Abstract

A search is performed for Higgs bosons decaying into invisible final states, produced in association with a Z(0) boson in e(+)e(-) collisions at energies between 183 and 209 GeV. The search is based on data samples collected by the OPAL detector at LEP corresponding to an integrated luminosity of about 660 pb(-1). The analysis aims to select events containing the hadronic decay products of the Z(0) boson and large missing momentum, as expected from Higgs boson decay into a pair of stable weakly interacting neutral particles, such as the lightest neutralino in the Minimal Supersymmetric Standard Model. The same analysis is applied to a search for nearly invisible Higgs boson cascade decays into stable weakly interacting neutral particles. No excess over the expected background from Standard Model processes is observed. Limits on the production of invisibly decaying Higgs bosons produced in association with a Z(0) boson are derived. Assuming a branching ratio BR(h(0) -> invisible) = 1, a lower limit of 108.2 GeV is placed on the Higgs boson mass at the 95% confidence level. Limits on the production of nearly invisibly decaying Higgs bosons are also obtained. (C) 2009 Elsevier B.V. All rights reserved.

Published
2010

12. Search for Dirac magnetic monopoles in e+e− collisions with the OPAL detector at LEP2

Author

M. Ford, P. Igo-Kemenes, W. Menges, Otmar Biebel, Achim Stahl, J. von Krogh, K. Ishii, H. Jeremie, Kiyotomo Kawagoe, Yoram Rozen, David J. Miller, M. Boutemeur, F. S. Merritt, S. Campana, Sachio Komamiya, R. J. Hawkings, B. C. Shen, H. Landsman, M. Gruwe, O. Schaile, Norbert Wermes, J. A. McKenna, T. Kawamoto, Oliver Pooth, D. Zer-Zion, F. K. Loebinger, Junichi Kanzaki, Ivor Fleck, Joleen Pater, Edward K. G. Sarkisyan, D. Toya, H. A. Neal, Andris Skuja, R. G. Kellogg, Csaba Hajdu, Stefano Marcellini, T. Kuhl, Siegfried Bethke, Alain Bellerive, S. W. O'Neale, Gordon H. Hanson, Gideon Bella, S. Orito, Daniel Lellouch, H. Mes, E. L. Barberio, Paolo Giacomelli, Takehiko Mori, T. Saeki, H. J. Burckhart, Christoph Geich-Gimbel, I. Nakamura, I. P. Duerdoth, Gideon Alexander, A. D. Schaile, D. Axen, J. Dubbert, Robert Vertesi, R. K. Carnegie, A. J. Martin, Paolo Capiluppi, Tetsuro Mashimo, M. F. Turner-Watson, J. W. Gary, Oana Elena Vickey Boeriu, Gabriella Pasztor, P. Vannerem, J. A. Wilson, A. Krasznahorkay, F. Spano, G. Mikenberg, Guenter Duckeck, K. J. Anderson, Peter Sherwood, Lorne Levinson, D. R. Ward, Thorsten Wengler, Raimund Ströhmer, J. Lillich, Richard Teuscher, N. Meyer, P. Mättig, Teresa Barillari, B. W. Kennedy, I. R. Bailey, Marek Tasevsky, A. Csilling, M. J. Oreglia, J. Letts, J. Ludwig, K. Runge, P. Jovanovic, R. J. Batley, M. Kupper, P. Bock, T. R. Wyatt, S. Braibant, C. P. Ward, N. K. Watson, C. Pahl, Dezso Horvath, J. Grunhaus, Gunter Wolf, Peter Krieger, D. E. Plane, Shoji Asai, W. Mader, M. Schumacher, S. Söldner-Rembold, M. Przybycień, Klaus Rabbertz, T. R. Junk, A. A. Carter, G. M. Dallavalle, D. Karlen, J. M. Roney, E. A. De Wolf, Stephen Lloyd, C. Ainsley, P. S. Wells, Tara Shears, M. Verzocchi, G. Giacomelli, A. M. Rossi, P. F. Åkesson, Giovanni Abbiendi, A. T. Watson, P. Scharff-Hansen, L. Zivkovic, Dave Charlton, P. Gagnon, A. De Roeck, M. Kobel, Gabriele Benelli, Koichi Nagai, Shlomo Dado, W. Mohr, A. Mutter, Ehud Duchovni, Robert McPherson, R. M. Brown, P. M. Watkins, Zoltan Laszlo Trocsanyi, Frans Meijers, A. Harel, Fabrizio Fabbri, A. Frey, George Lafferty, A. M. Smith, Satoshi Mihara, A. Michelini, Ikuo Ueda, D. M. Strom, E. Torrence, A. Gupta, P. Renkel, R. D. Heuer, T. Kobayashi, J. Lu, M. Cozzi, Gregor Herten, A. Ludwig, John Hill, James Pinfold, A. Quadt, R. Seuster, Claudia Ciocca, Beatrix Dienes, K. Sachs, J. R. Carter, J. Goldberg, Philip Bechtle, Frank Fiedler, M. Hamann, G. Anagnostou, Balazs Ujvari, J. E. Pilcher, Richard Keeler, Pamela Ferrari, G. W. Wilson, R. J. Sobie, M. Hauschild, C. Y. Chang, Joost Vossebeld, M. A. Thomson, E. K. U. Gross, H. Voss, Klaus Desch, Satoru Yamashita, Matthias Schröder, E. Tsur, C. M. Hawkes, Christoph Rembser, T. Behnke, Isabel Marian Trigger, K. W. Bell, Erez Etzion, T. Schörner-Sadenius, Stefan Kluth, Shlomit Tarem, Tobias Kramer, M. Giunta, P. J. Bell, M. Cuffiani, H. Nanjo, C. F. Vollmer, Jochen Schieck, R. J. Barlow, Alexander Oh, and D. Lanske

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), 010308 nuclear & particles physics, Dirac (video compression format), Electron–positron annihilation, Magnetic monopole, Tracking (particle physics), 01 natural sciences, Charged particle, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Ionization energy, 010306 general physics, Event generator
Abstract

This Letter describes a direct search for pair produced magnetic monopoles in e(+)e(-) collisions. The analysis is based on 62.7 pb(-1) of data collected with the OPAL detector at an average centre-of-mass energy of root S = 206.3 GeV. The monopole signal was assumed to be characterized by two back-to-back particles with an anomalously high ionization energy loss dE/dx in the tracking chambers. No evidence for production of monopoles was observed. Upper limits were obtained on the magnetic monopole pair-production cross-section (sigma) in the mass range 45 GeV/c(2) < m(M) < 102 GeV/c(2). The average limit is sigma < 0.05 pb and is essentially independent of the magnetic monopole mass. The cross-section limit is derived at the 95% confidence level and is valid for spin-1/2 magnetic monopoles. (C) 2008 Published by Elsevier B.V.

Published
2008

13. Inclusive jet production in photon–photon collisions at see from 189 to 209 GeV

Author

George Lafferty, Erez Etzion, Satoshi Mihara, Thorsten Wengler, Stefan Kluth, Shlomit Tarem, Klaus Rabbertz, Frank Fiedler, Dave Charlton, M. Ford, Stephen Lloyd, A. Harel, J. Lillich, Kiyotomo Kawagoe, Ikuo Ueda, D. M. Strom, S. Campana, B. W. Kennedy, M. Giunta, P. Jovanovic, C. Y. Chang, J. Lu, Peter Krieger, D. R. Ward, J. von Krogh, M. Schumacher, P. J. Bell, Shlomo Dado, Ehud Duchovni, D. Zer-Zion, D. E. Plane, Christoph Geich-Gimbel, R. D. Heuer, Gabriele Benelli, F. K. Loebinger, A. Michelini, P. Scharff-Hansen, R. J. Hawkings, T. Schörner-Sadenius, E. A. De Wolf, Gideon Bella, Ivor Fleck, E. Tsur, Gunter Wolf, Joleen Pater, Sachio Komamiya, C. M. Hawkes, H. J. Burckhart, Edward K. G. Sarkisyan, D. Toya, T. Kobayashi, A. Ludwig, Isabel Marian Trigger, K. W. Bell, D. Karlen, H. A. Neal, L. Zivkovic, Pamela Ferrari, H. Nanjo, A. M. Smith, D. J. Miller, A. D. Schaile, Gabriella Pasztor, P. Igo-Kemenes, M. Przybycień, P. Vannerem, J. C. Hill, Tara Shears, Gregor Herten, Richard Teuscher, Tobias Kramer, B. C. Shen, T. R. Junk, A. A. Carter, K. Ishii, H. Jeremie, C. P. Ward, M. Gruwe, Andris Skuja, S. W. O'Neale, E. Torrence, A. Gupta, Siegfried Bethke, H. Mes, P. S. Wells, A. Csilling, S. Söldner-Rembold, Oliver Pooth, C. F. Vollmer, M. Boutemeur, F. S. Merritt, Jochen Schieck, J. M. Roney, Gideon Alexander, Tetsuro Mashimo, M. F. Turner-Watson, Balazs Ujvari, J. Goldberg, J. E. Pilcher, R. K. Keeler, N. K. Watson, Koichi Nagai, H. Landsman, T. R. Wyatt, I. P. Duerdoth, K. J. Anderson, A. T. Watson, M. Verzocchi, P. F. Åkesson, Giovanni Abbiendi, I. Nakamura, J. W. Gary, W. Mohr, O. Schaile, N. Meyer, R. J. Barlow, Paolo Capiluppi, Paolo Giacomelli, M. Kupper, M. Hamann, Raimund Ströhmer, G. Mikenberg, G. W. Wilson, M. Hauschild, T. Behnke, P. Mättig, Marek Tasevsky, P. M. Watkins, T. Kuhl, E. L. Barberio, J. A. McKenna, Dezso Horvath, M. A. Thomson, J. Dubbert, Robert Vertesi, R. K. Carnegie, Robert McPherson, R. M. Brown, Lorne Levinson, Christoph Rembser, E. K. U. Gross, H. Voss, Daniel Lellouch, Marco Cuffiani, Takehiko Mori, P. Renkel, R. J. Batley, R. J. Sobie, J. A. Wilson, I. R. Bailey, R. G. Kellogg, Satoru Yamashita, James Pinfold, Joost Vossebeld, A. Quadt, R. Seuster, C. Ainsley, Fabrizio Fabbri, Klaus Desch, A. Frey, Guenter Duckeck, A. M. Rossi, A. J. Martin, Csaba Hajdu, Stefano Marcellini, Alain Bellerive, A. Krasznahorkay, W. Mader, J. Letts, C. Pahl, T. Saeki, Alexander Oh, G. Anagnostou, D. Lanske, Gordon H. Hanson, Claudia Ciocca, Achim Stahl, K. Sachs, J. R. Carter, Philip Bechtle, G. Giacomelli, A. Mutter, A. De Roeck, M. Kobel, Frans Meijers, Yoram Rozen, J. Grunhaus, Junichi Kanzaki, Teresa Barillari, B. Dienes, Shoji Asai, D. Axen, Oana Elena Vickey Boeriu, F. Spano, Peter Sherwood, J. Ludwig, K. Runge, P. Bock, P. Gagnon, Zoltan Laszlo Trocsanyi, W. Menges, Otmar Biebel, Norbert Wermes, T. Kawamoto, S. Orito, M. J. Oreglia, S. Braibant, and Matthias Schröder

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Jet (fluid), Photon, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Perturbative QCD, 01 natural sciences, Nuclear physics, Pair production, 0103 physical sciences, Strong coupling, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, 010306 general physics, Event generator
Abstract

Inclusive jet production (e(+)e(-) -> e(+)e(-) + jet + X) is studied in collisions of quasi-real photons radiated by the LEP beams at e(+)e(-) centre-of-mass energies root s(ee) from 189 to 209 GeV. Jets are reconstructed using the k(perpendicular to) jet algorithm. The inclusive differential cross-section is measured as a function of the jet transverse momentum, p(T)(jet), in the range 5 < p(T)(jet) < 40 GeV for pseudo-rapidities, eta(jet), in the range - 1.5 < eta(jet) < 1.5. The results are compared to predictions of perturbative QCD in next-to-leading order in the strong coupling constant. (c) 2007 Elsevier B.V. All rights reserved.

Published
2008

14. Model-independent determination of the top Yukawa coupling from LHC and ILC

Author

Markus Schumacher and Klaus Desch

Subjects
Physics, Particle physics, Top quark, Large Hadron Collider, Physics and Astronomy (miscellaneous), High Energy Physics::Phenomenology, Yukawa potential, FOS: Physical sciences, Electron, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Positron, Higgs boson, Measurement precision, High Energy Physics::Experiment, Engineering (miscellaneous)
Abstract

We show how a measurement of the process pp-->t tbar H + X at the LHC and a measurement of the Higgs boson branching ratios BR(H-->b bar) and BR(H-->W+W-) at a future linear electron positron collider can be combined to extract a model-independent measurement of the top quark Yukawa coupling. We find that for 120 GeV < m_H < 200 GeV a measurement precision of 15% including systematic uncertainties can be achieved for integrated luminosities of 300 fb-1 at the LHC and 500 fb-1 at the LC at a centre-of-mass energy of 350 GeV., A contribution to the LHC / LC Study Group document, 7 pages, 3 figures

Published
2006

15. Measurement of $F_2^{c\bar{c}}$ and $F_2^{b\bar{b}}$ at low Q2 and x * using the H1 vertex detector at HERA

Author

Daniel Pitzl, J. Zacek, G. Leibenguth, Pavel Murin, M. Ibbotson, B. Stella, Roland Horisberger, A. Valkárová, I. Sheviakov, Stefan Schmitt, F. Cassol-Brunner, A. Makankine, Wolfram Erdmann, G. Buschhorn, D. Ozerov, R. Weber, A. Baghdasaryan, M. Jacquet, D. P. C. Sankey, P. E. Reimer, A. Rostovtsev, M. Goettlich, L. Hajduk, Wolfgang Lange, B. Olivier, Laurent Favart, B. Portheault, A. Vest, O. Behrendt, S. Vinokurova, P. Kostka, T. Anthonis, V. Jemanov, J. Gayler, M. Hildebrandt, S. Hussain, J. Turnau, I. Milcewicz-Mika, I. Tsakov, Sakar Osman, C. Veelken, D. Meer, Matthew Beckingham, T. Laštovička, E. Barrelet, E. Gabathuler, E. Wünsch, Vladimir Palichik, K. H. Hiller, G. Thompson, R. C. W. Henderson, S. Gorbounov, V. Spaskov, Jan Kretzschmar, Anna Kropivnitskaya, V. Chekelian, S. Ghazaryan, J. Kückens, A. Nikiforov, Paul Laycock, E. Malinovski, Z. Rurikova, Emmanuel Sauvan, E. A. De Wolf, Ch. Berger, Karlheinz Meier, R. Roosen, G. Grindhammer, C. Goyon, B. R. Grell, Andrej Liptaj, R. Felst, D. Utkin, J. Bähr, Theodora Papadopoulou, D. Wegener, N. Werner, Y. de Boer, H. Henschel, E. Rizvi, G. D. Patel, K. Wacker, H. Meyer, Georgios Tsipolitis, M. Fleischer, B. List, A. Aktas, D.P. Johnson, P. Van Mechelen, J.C. Bizot, C. Niebuhr, Fabian Zomer, A. Specka, C. Wissing, D. Mladenov, Matthias Ulrich Mozer, R. Marshall, N. Malden, C. Pascaud, L. Finke, Dirk L. Hoffmann, S. Egli, Dusan Bruncko, G. Franke, B. Naroska, I. Foresti, M.-O. Boenig, G. Cozzika, Thorsten Lux, L. Janauschek, S. Ginzburgskaya, Grzegorz Nowak, Stefan Valkar, A. Petrukhin, E. Lobodzinska, C. Kiesling, F. Salvaire, P. D. Thompson, Bogdan Povh, F. Sefkow, M. Urban, D. Haidt, V. Yeganov, T. Greenshaw, Y.C. Zhu, K. Daum, John A Coughlan, Y. Soloviev, W.D. Dau, J. B. Dainton, K. Krastev, T. Hreus, L. Lytkin, A. De Roeck, E. Tzamariudaki, A. J. Campbell, A. Dubak, Y. Vazdik, D. Lüke, M. Peez, Stefania Xella, Leif J. Jönsson, Benoit Roland, J. Cvach, T. Klimkovich, Cristinel Diaconu, Stephen Maxfield, J. Stiewe, J. Bracinik, N. Gogitidze, F. P. Schilling, Christoph Grab, L. Schoeffel, Nicolas Berger, J. Zimmermann, S. Levonian, A. Zhelezov, S. Baudrand, J. Ferencei, M. Martisikova, S. Sch¨atzel, V. Efremenko, S. Mikocki, S. Schmidt, T. Kluge, Guenter Eckerlin, André Schöning, L. Goerlich, Michael R. Wessels, V. Brisson, L. Lindfeld, Zhen Zhang, Ricardo Lopez-Fernandez, S. Baumgartner, Andreas Meyer, A. Usik, T. Frisson, I. Strauch, Philipp Fleischmann, E. Perez, Peter Robmann, A. D.R. Vargas Trevino, B. Vujicic, Jean-Arcady Meyer, P. Baranov, G. Laštovička-Medin, C. Schmitz, Hannes Jung, Alexander Zhokin, J. Becker, C. Vallée, A. Rimmer, A. Knutsson, Gero Flucke, M. Kapichine, M. Nozicka, F. Tomasz, G. Knies, B. Delcourt, Magnus Hansson, G. Heinzelmann, V. Dodonov, S. Mangano, F. Moreau, S. J. Aplin, S. Essenov, Ilias Panagoulias, D. Traynor, R. Plačakyte, Katerina Lipka, M. Ismail, David Milstead, P. A. Smirnov, V. Tchoulakov, Pierre Marage, Klaus Desch, A. Falkewicz, R. Eichler, Adrian Perieanu, S. Caron, J. E. Olsson, W. Bartel, F. W. Büsser, J. Zalesak, T. J. Sloan, P.J.W. Faulkner, A.S. Belousov, Sergey Rusakov, P. Truöl, J. V. Morris, I. Glushkov, Gerhard Brandt, S. Backovic, V. Volchinski, I. R. Kenyon, Natasa Raicevic, H. Lueders, C. Risler, Vincent Boudry, A. W. Jung, Xavier Janssen, A. N. Morozov, M. Ellerbrock, W. Yan, D. Perez-Astudillo, M. Gregori, N. Loktionova, A. Bunyatyan, G. Herrera, Bradley Cox, D.K. Nikitin, O. Henshaw, O. Behnke, R. Wolf, B. Wessling, F. Eisele, A. Hovhannisyan, Ankita Mehta, Anton Babaev, J. G. Contreras, C. Gwilliam, A. M. Fomenko, A. Mohamed, J. Wagner, V. P. Andreev, C. Gerlich, M. P. J. Landon, A. Astvatsatourov, P. Prideaux, R. Oganezov, I. Tsurin, K. Sedlák, C. Wigmore, H-C. Schultz-Coulon, H. U. Martyn, Matthias Klein, K. Müller, V. Cerny, D.P. Brown, Judith Katzy, A. Asmone, Y.H. Fleming, David South, Karel Cerny, K. Krüger, V. Lubimov, K. Nankov, L. N. Shtarkov, A. Glazov, V. Korbel, Alexandre Lebedev, C. Werner, Paul Newman, T. Zimmermann, Claus Kleinwort, G. Weber, U. Straumann, Thomas Naumann, Erika Garutti, A. V. Fedotov, L. Bystritskaya, H. Zohrabyan, R.N. Shaw-West, N. Keller, V. Lendermann, and A.-I. Lucaci-Timoce

Subjects
Quark, Quantum chromodynamics, Physics, Particle physics, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, High Energy Physics::Phenomenology, HERA, Deep inelastic scattering, 01 natural sciences, Nuclear physics, 0103 physical sciences, Vertex (curve), High Energy Physics::Experiment, Charm (quantum number), Impact parameter, Nuclear Experiment, 010306 general physics, Engineering (miscellaneous), Bar (unit)
Abstract

Measurements are presented of inclusive charm and beauty cross sections in e^+p collisions at HERA for values of photon virtuality 12 \le Q^2 \le 60 GeV^2 and of the Bjorken scaling variable 0.0002 \le x \le 0.005. The fractions of events containing charm and beauty quarks 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. Values for the structure functions F_2^{c\bar{c}} and F_2^{b\bar{b}} are obtained. This is the first measurement of F_2^{b\bar{b}} in this kinematic range. The results are found to be compatible with the predictions of perturbative quantum chromodynamics and withprevious measurements of F_2^{c\bar{c}}.

Published
2006

16. 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

17. Search for radions at LEP2

Author

S. Yamashita, P. Igo-Kemenes, A. D. Schaile, K. Ishii, H. Jeremie, Gabriella Pasztor, P. Vannerem, H. Voss, D. E. Plane, O. Schaile, T. Kuhl, G. Giacomelli, Pamela Ferrari, P. Scharff-Hansen, C. P. Ward, S. Söldner-Rembold, P. Tran, Yoram Rozen, Matthias Schröder, D. Axen, R. M. Brown, A. De Roeck, M. Kobel, Lorne Levinson, I. R. Bailey, Ehud Duchovni, Oana Elena Vickey Boeriu, F. Spano, Kiyotomo Kawagoe, A. Gupta, A. Csilling, Frans Meijers, Junichi Kanzaki, Graham Wilson, J. Ludwig, T. Schörner-Sadenius, K. Runge, D. J. Miller, P. Bock, T. Kobayashi, A. Ludwig, J. Goldberg, C. Y. Chang, John Hill, Achim Stahl, B. C. Shen, Alain Bellerive, Daniel Lellouch, Shlomo Dado, D. R. Ward, A. M. Smith, Takehiko Mori, M. Donkers, Arnulf Quadt, P. M. Watkins, Siegfried Bethke, M. Przybycień, S. Campana, G. Anagnostou, N. K. Watson, A. A. Carter, George Lafferty, T. Behnke, A. J. Martin, Christoph Rembser, Satoshi Mihara, J. W. Gary, Klaus Rabbertz, Teresa Barillari, H. Landsman, P. Renkel, Gunter Wolf, M. Verzocchi, Stephen Lloyd, Andris Skuja, P. F. Åkesson, Giovanni Abbiendi, C. Ainsley, A. M. Rossi, Raimund Ströhmer, D. Karlen, Marek Tasevsky, Frank Fiedler, B. Dienes, Dezso Horvath, M. J. Oreglia, A. Michelini, P. Mättig, E. L. Barberio, Shoji Asai, P. Gagnon, Gianni Masetti, R. J. Hemingway, S. Braibant, J. Dubbert, R. K. Carnegie, J. Allison, Tetsuro Mashimo, M. F. Turner-Watson, J. Lillich, B. W. Kennedy, Tara Shears, Zoltan Laszlo Trocsanyi, P. Jovanovic, Claudia Ciocca, J. A. Wilson, K. Sachs, L. Zivkovic, C. Pahl, Peter Krieger, Dave Charlton, Philip Bechtle, C. F. Vollmer, Erez Etzion, Jochen Schieck, N. Meyer, Guenter Duckeck, Stefan Kluth, Shlomit Tarem, Paolo Giacomelli, R. J. Barlow, A. Mutter, J. R. Carter, M. Kupper, Richard Teuscher, Gideon Alexander, Paolo Capiluppi, M. Giunta, E. Tsur, C. M. Hawkes, W. Menges, Otmar Biebel, Isabel Marian Trigger, K. W. Bell, J. von Krogh, T. R. Wyatt, R. J. Hawkings, Tobias Kramer, James Pinfold, Alexander Oh, I. Nakamura, D. Lanske, S. W. O'Neale, Sachio Komamiya, R. D. Heuer, P. O. Günther, Gideon Bella, H. J. Burckhart, T. Saeki, K. J. Anderson, Norbert Wermes, T. Kawamoto, S. Orito, J. Grunhaus, J. M. Roney, M. Schumacher, Koichi Nagai, W. Mohr, E. A. De Wolf, P. Amaral, M. A. Thomson, E. K. U. Gross, H. Mes, I. P. Duerdoth, Eric Torrence, G. Mikenberg, R. J. Batley, P. J. Bell, H. Nanjo, M. Gruwé, Richard Nisius, Marco Cuffiani, M. Ford, A. Harel, Robert McPherson, K. D. Hoffman, Ikuo Ueda, D. M. Strom, Fabrizio Fabbri, A. Frey, J. Lu, W. F. Mader, P. S. Wells, A. T. Watson, M. Hamann, Richard Keeler, R. J. Sobie, Joost Vossebeld, Klaus Desch, T. R. Junk, M. Boutemeur, F. S. Merritt, Gregor Herten, J. A. McKenna, Christoph Geich-Gimbel, J. E. Pilcher, Thorsten Wengler, Gabriele Benelli, M. Hauschild, R. Vértesi, Gordon H. Hanson, Rolf Seuster, P. Sherwood, Oliver Pooth, R. G. Kellogg, Csaba Hajdu, Stefano Marcellini, James Letts, D. Zer-Zion, F. K. Loebinger, Ivor Fleck, Joleen Pater, Edward K. G. Sarkisyan, D. Toya, Balazs Ujvari, H. A. Neal, G.ABBIENDI, C.AINSLEY, P.F.°AKESSON, G.ALEXANDER, J.ALLISON, P.AMARAL, G.ANAGNOSTOU, K.J.ANDERSON, S.ASAI, D.AXEN, G.AZUELOS, I.BAILEY, E.BARBERIO, T.BARILLARI, R.J.BARLOW, R.J.BATLEY, P.BECHTLE, T.BEHNKE, K.W.BELL, P.J.BELL, G.BELLA, A.BELLERIVE, G.BENELLI, S.BETHKE, O.BIEBEL, O.BOERIU, P.BOCK, M.BOUTEMEUR, S.BRAIBANT, R.M.BROWN, K.BUESSER, H.J.BURCKHART, S.CAMPANA, P.CAPILUPPI, R.K.CARNEGIE, A.A.CARTER, J.R.CARTER, C.Y.CHANG, D.G.CHARLTON, C.CIOCCA, A.CSILLING, M.CUFFIANI, S.DADO, A.DE ROECK, E.A.DE WOLF, K.DESCH, B.DIENES, M.DONKERS, J.DUBBERT, E.DUCHOVNI, G.DUCKECK, I.P.DUERDOTH, E.ETZION, F.FABBRI, L.FELD, P.FERRARI, F.FIEDLER, I.FLECK, M.FORD, A.FREY, P.GAGNON, J.W.GARY, G.GAYCKEN, C.GEICH-GIMBEL, G.GIACOMELLI, P.GIACOMELLI, M.GIUNTA, J.GOLDBERG, E.GROSS, J.GRUNHAUS, M.GRUW´E, P.O.G¨UNTHER, A.GUPTA, C.HAJDU, M.HAMANN, G.G.HANSON, A.HAREL, M.HAUSCHILD, C.M.HAWKES, R.HAWKINGS, R.J.HEMINGWAY, G.HERTEN, R.D.HEUER, J.C.HILL, K.HOFFMAN, D.HORV´ATH, P. IGO-KEMENES, K. ISHII, H. JEREMIE, P. JOVANOVIC, T.R. JUNK, N.KANAYA, J.KANZAKI, D.KARLEN, K.KAWAGOE, T.KAWAMOTO, R.K.KEELER, R.G.KELLOGG, B.W.KENNEDY, S.KLUTH, T.KOBAYASHI, M.KOBEL, S.KOMAMIYA, T.KR¨AMER, P.KRIEGER, J. VON KROGH, K.KRUGER, T.KUHL, M.KUPPER, G.D. LAFFERTY, H. LANDSMAN, D. LANSKE, J.G. LAYTER, D. LELLOUCH, J. LETTSO, L. LEVINSON, J. LILLICH, S.L. LLOYD, F.K. LOEBINGER, J. LU, A. LUDWIG, J. LUDWIG, W.MADER, S.MARCELLINI, A.J.MARTIN, G.MASETTI, T.MASHIMO, P.M¨ATTIGM, J.MCKENNA, R.A.MCPHERSON, F.MEIJERS, W.MENGES, F.S.MERRITT, H.MES, N.MEYER, A.MICHELINI, S.MIHARA, G.MIKENBERG, D.J.MILLER, S.MOED, W.MOHR, T.MORI, A.MUTTER, K.NAGAI, I.NAKAMURA, H.NANJO, H.A.NEAL, R.NISIUS, S.W.O’NEALE, A.OH, M.J.OREGLIA, S.ORITO, C.PAHL, G.P´ASZTOR, J.R.PATER, J.E.PILCHER, J.PINFOLD, D.E.PLANE, O.POOTH, M.PRZYBYCIE´N, A.QUADT, K.RABBERTZ, C.REMBSER, P.RENKEL, J.M.RONEY, A.M.ROSSI, Y.ROZEN, K.RUNGE, K. SACHS, T. SAEKI, E.K.G. SARKISYAN, A.D. SCHAILE, O. SCHAILE, P. SCHARFF-HANSEN, J. SCHIECK, T. SCH¨ORNER-SADENIUS, M. SCHR¨ODER, M. SCHUMACHER, W.G. SCOTT, R. SEUSTER, T.G. SHEARS, B.C. SHEN, P. SHERWOOD, A. SKUJA, A.M. SMITH, R. SOBIE, S. S¨OLDNER-REMBOLD, F. SPANO, A. STAHL, D. STROM, R. STR¨OHMER, S.TAREM, M.TASEVSKY, R.TEUSCHER, M.A.THOMSON, E.TORRENCE, D.TOYA, P.TRAN, I.TRIGGER, Z.TR´OCS´ANYI, E.TSUR, M.F.TURNER-WATSON, I.UEDA, B.UJV´ARI, C.F.VOLLMER, P.VANNEREM, R.V´ERTESI, M.VERZOCCHI, H.VOSS, J.VOSSEBELD, C.P.WARD, D.R.WARD, P.M.WATKINS, A.T.WATSON, N.K.WATSON, P.S.WELLS, T.WENGLER, N.WERMES, G.W.WILSON, J.A.WILSON, G.WOLF, T.R.WYATT, S.YAMASHITA, D. ZER-ZION, L. ZIVKOVIC, and OPAL Collaboration

Subjects
Particle physics, Nuclear and High Energy Physics, High Energy Physics::Lattice, FOS: Physical sciences, Elementary particle, 01 natural sciences, 7. Clean energy, Standard Model, High Energy Physics - Experiment, symbols.namesake, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, 010306 general physics, Boson, Physics, Condensed Matter::Quantum Gases, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Hierarchy problem, Scalar boson, Higgs field, Higgs boson, symbols, High Energy Physics::Experiment, Higgs mechanism, Particle Physics - Experiment
Abstract

A new scalar resonance, called the radion, with couplings to fermions and bosons similar to those of the Higgs boson, is predicted in the framework of Randall-Sundrum models, proposed solutions to the hierarchy problem with one extra dimension. An important distinction between the radion and the Higgs boson is that the radion would couple directly to gluon pairs, and in particular its decay products would include a significant fraction of gluon jets. The radion had the same quantum numbers as the Standard Model (SM) Higgs boson, and therefore they can mix, with the resulting mass eigenstates having properties different from those of the SM Higgs boson. Existing searches for the Higgs boson are sensitive to the possible production and decay of radions and Higgs bosons in these models. For the first time, searches for the SM Higgs boson and flavour-independent and decay-mode independent searches for a neutral Higgs boson are used in combination to explore the parameter space of the Randall-Sundrum model. In the dataset recorded by the OPAL experiment at LEP, no evidence for radion or Higgs particle production was observed in any of those searches. The results are used to set limits on the radion and Higgs boson masses., Comment: 18 pages, 6 figures, Submitted to Phys. Lett. B

Published
2005
Full Text
View/download PDF

18. Measurements of Rb in e+e− collisions at s between 182 and 209 GeV

Author

A. Csilling, P. Mättig, Shoji Asai, Daniel Lellouch, Takehiko Mori, W. F. Mader, E. Torrence, A. Gupta, Dave Charlton, O. Schaile, Yoram Rozen, Junichi Kanzaki, Paolo Giacomelli, J. Goldberg, J. M. Roney, M. Schumacher, Andris Skuja, Christoph Geich-Gimbel, R. Nisius, R. Vértesi, George Lafferty, Graham Wilson, P. S. Wells, Matthias Schröder, Tetsuro Mashimo, M. F. Turner-Watson, Satoshi Mihara, P. Gagnon, Gianni Masetti, R. D. Heuer, Koichi Nagai, A. T. Watson, Shlomo Dado, E. A. De Wolf, D. E. Plane, C. F. Vollmer, Achim Stahl, Gideon Bella, S. Yamashita, P. Igo-Kemenes, Gordon H. Hanson, Klaus Rabbertz, Stephen Lloyd, Zoltan Laszlo Trocsanyi, M. Hauschild, H. J. Burckhart, W. Mohr, N. Meyer, M. Kupper, P. Tran, F. S. Merritt, A. Harel, N. K. Watson, Alain Bellerive, M. A. Thomson, K. Ishii, R. K. Carnegie, T. Schörner-Sadenius, Ikuo Ueda, D. M. Strom, J. A. Wilson, P. Amaral, Oliver Pooth, H. Jeremie, E. K. U. Gross, J. Lu, Tara Shears, D. Axen, John Allison, S. Campana, D. J. Miller, Kiyotomo Kawagoe, M. Gruwé, Oana Elena Vickey Boeriu, F. Spano, C. Ainsley, Gabriella Pasztor, J. A. McKenna, Peter Sherwood, Gideon Alexander, T. Barillari, P. Vannerem, J. Ludwig, K. Runge, P. Bock, M. Hamann, R. J. Hemingway, James Pinfold, R. G. Kellogg, C. P. Ward, G. Anagnostou, R. Seuster, A. Michelini, H. Mes, J. Lillich, M. Boutemeur, A. D. Schaile, Marco Cuffiani, Csaba Hajdu, S. Söldner-Rembold, Thorsten Wengler, B. W. Kennedy, Ehud Duchovni, R. K. Keeler, I. P. Duerdoth, P. Jovanovic, R. M. Brown, Lorne Levinson, Stefano Marcellini, R. J. Sobie, A. J. Martin, Peter Krieger, T. Kuhl, Christoph Rembser, James Letts, Arnulf Quadt, Joost Vossebeld, I. R. Bailey, F. Fiedler, O. Biebel, Klaus Desch, S. Bethke, P. M. Watkins, Alessandro Montanari, D. Zer-Zion, P. J. Bell, G. Mikenberg, Claudia Ciocca, Richard Teuscher, T. Behnke, F. K. Loebinger, Gabriele Benelli, K. Sachs, Philip Bechtle, M. Ford, H. Landsman, P. Renkel, Ivor Fleck, T. Kobayashi, Pamela Ferrari, A. Ludwig, R. J. Batley, Joleen Pater, Erez Etzion, D. R. Ward, P. Scharff-Hansen, S. Kluth, Edward K. G. Sarkisyan, D. Toya, T. R. Junk, Balazs Ujvari, H. A. Neal, E. L. Barberio, T. R. Wyatt, A. M. Smith, Robert McPherson, Gregor Herten, H. Nanjo, Shlomit Tarem, K. D. Hoffman, Fabrizio Fabbri, A. Frey, J. von Krogh, H. Voss, J. Dubbert, M. Giunta, G. Giacomelli, A. De Roeck, M. Kobel, R. J. Hawkings, Gunter Wolf, J. E. Pilcher, Frans Meijers, D. Karlen, G. Duckeck, M. Przybycień, A. A. Carter, M. Verzocchi, P. F. Åkesson, Giovanni Abbiendi, B. C. Shen, M. Donkers, J. W. Gary, Marek Tasevsky, Dezso Horvath, W. Menges, Norbert Wermes, T. Kawamoto, S. Orito, E. Tsur, C. M. Hawkes, M. J. Oreglia, S. Braibant, Isabel Marian Trigger, K. W. Bell, L. Zivkovic, J. R. Carter, J. C. Hill, Tobias Kramer, Jochen Schieck, R. J. Barlow, R. Ströhmer, Alexander Oh, I. Nakamura, D. Lanske, J. Grunhaus, Sachio Komamiya, T. Saeki, Alessandra Fanfani, Beatrix Dienes, C. Y. Chang, A. Mutter, S. W. O'Neale, C. Pahl, P. O. Günther, and K. J. Anderson

Subjects
Nuclear physics, Physics, Quark, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Electron–positron annihilation, 0103 physical sciences, Charm (quantum number), 010306 general physics, 01 natural sciences, Standard Model, Lepton
Abstract

Measurements of R b , the ratio of the b b ¯ cross-section to the q q ¯ cross-section in e + e − collisions, are presented. The data were collected by the OPAL experiment at LEP at centre-of-mass energies between 182 and 209 GeV. Lepton, lifetime and event-shape information is used to tag events containing b quarks with high efficiency. The data are compatible with the Standard Model expectation. The mean ratio of the eight measurements reported here to the Standard Model prediction is 1.055 ± 0.031 ± 0.037 , where the first error is statistical and the second systematic.

Published
2005

19. Determination of the LEP beam energy using radiative fermion-pair events

Author

Siegfried Bethke, J. W. Gary, Dezso Horvath, W. Menges, Otmar Biebel, G. W. Wilson, M. Hamann, M. Hauschild, Richard Keeler, J. Goldberg, R. J. Sobie, Joost Vossebeld, George Lafferty, Klaus Desch, Christoph Rembser, H. Landsman, W. F. Mader, Gunter Wolf, Erez Etzion, S. W. O'Neale, Stefan Kluth, Shlomit Tarem, P. O. Günther, Norbert Wermes, T. Kawamoto, M. Giunta, D. Karlen, Satoshi Mihara, P. S. Wells, P. Sherwood, Oliver Pooth, S. Orito, A. T. Watson, Alain Bellerive, E. Tsur, C. M. Hawkes, E. L. Barberio, Isabel Marian Trigger, K. W. Bell, K. J. Anderson, H. Mes, Kiyotomo Kawagoe, John Allison, A. Harel, Ikuo Ueda, D. M. Strom, J. C. Hill, J. Lu, I. P. Duerdoth, Tobias Kramer, R. J. Hemingway, Gianni Masetti, M. J. Oreglia, C. Y. Chang, Shlomo Dado, J. Lillich, Achim Stahl, S. Braibant, N. K. Watson, Sachio Komamiya, Dave Charlton, L. Zivkovic, Frank Fiedler, Thorsten Wengler, B. W. Kennedy, P. Jovanovic, J. R. Carter, D. Toya, Tara Shears, M. Przybycień, Peter Krieger, C. Ainsley, A. M. Rossi, Raimund Ströhmer, Christoph Geich-Gimbel, Giora Mikenberg, R. G. Kellogg, R. J. Batley, Gideon Alexander, J. M. Roney, A. A. Carter, Csaba Hajdu, R. D. Heuer, P. J. Bell, Stefano Marcellini, S. Yamashita, M. Schumacher, A. D. Schaile, Gabriella Pasztor, T. Saeki, James Letts, P. Vannerem, M. Verzocchi, Gideon Bella, Gabriele Benelli, P. F. Åkesson, Giovanni Abbiendi, Beatrix Dienes, Klaus Rabbertz, P. Igo-Kemenes, Stephen Lloyd, M. Tasevsky, R. Vértesi, Yoram Rozen, E. A. De Wolf, R. M. Brown, Lorne Levinson, Claudia Ciocca, T. Behnke, K. Sachs, C. P. Ward, Philip Bechtle, H. J. Burckhart, S. Söldner-Rembold, Ehud Duchovni, Alexander Oh, P. Amaral, I. R. Bailey, J. Dubbert, R. K. Carnegie, K. Ishii, H. Jeremie, A. Michelini, Arnulf Quadt, Matthias Schröder, Koichi Nagai, D. J. Miller, T. R. Junk, T. Kobayashi, K. Hoffman, A. Ludwig, Gregor Herten, W. Mohr, J. A. Wilson, Junichi Kanzaki, M. Boutemeur, F. S. Merritt, P. Gagnon, I. Nakamura, D. Lanske, D. E. Plane, P. M. Watkins, A. Mutter, Robert McPherson, D. R. Ward, Zoltan Laszlo Trocsanyi, O. Schaile, Paolo Giacomelli, Gordon H. Hanson, J. A. McKenna, T. Schörner-Sadenius, J. E. Pilcher, P. Renkel, Daniel Lellouch, T. Kuhl, P. Tran, Fabrizio Fabbri, A. Frey, Takehiko Mori, H. Nanjo, D. Zer-Zion, A. J. Martin, D. Axen, F. K. Loebinger, M. Ford, Oana Elena Vickey Boeriu, F. Spano, Ivor Fleck, P. Capiluppi, Joleen Pater, Edward K. G. Sarkisyan, J. Ludwig, K. Runge, P. Bock, M. A. Thomson, Balazs Ujvari, H. A. Neal, C. F. Vollmer, J. von Krogh, A. Gupta, Jochen Schieck, R. J. Hawkings, E. K. U. Gross, J. Grunhaus, C. Pahl, Teresa Barillari, R. J. Barlow, A. Csilling, M. Gruwé, Eric Torrence, Richard Nisius, P. Mättig, Shoji Asai, Marco Cuffiani, H. Voss, Andris Skuja, G. Giacomelli, Pamela Ferrari, A. De Roeck, M. Kobel, Tetsuro Mashimo, M. F. Turner-Watson, Frans Meijers, N. Meyer, M. Kupper, G. Anagnostou, James Pinfold, R. Seuster, P. Scharff-Hansen, Guenter Duckeck, A. M. Smith, S. Campana, Richard Teuscher, T. R. Wyatt, B. C. Shen, M. Donkers, G.ABBIENDI, C.AINSLEY, P.F.°AKESSON, G.ALEXANDER, J.ALLISON, P.AMARAL, G.ANAGNOSTOU, K.J.ANDERSON, S.ASAI, D.AXEN, G.AZUELOS, I.BAILEY, E.BARBERIO, T.BARILLARI, R.J.BARLOW, R.J.BATLEY, P.BECHTLE, T.BEHNKE, K.W.BELL, P.J.BELL, G.BELLA, A.BELLERIVE, G.BENELLI, S.BETHKE, O.BIEBEL, O.BOERIU, P.BOCK, M.BOUTEMEUR, S.BRAIBANT, R.M.BROWN, K.BUESSER, H.J.BURCKHART, S.CAMPANA, P.CAPILUPPI, R.K.CARNEGIE, A.A.CARTER, J.R.CARTER, C.Y.CHANG, D.G.CHARLTON, C.CIOCCA, A.CSILLING, M.CUFFIANI, S.DADO, A.DE ROECK, E.A.DE WOLF, K.DESCH, B.DIENES, M.DONKERS, J.DUBBERT, E.DUCHOVNI, G.DUCKECK, I.P.DUERDOTH, E.ETZION, F.FABBRI, L.FELD, P.FERRARI, F.FIEDLER, I.FLECK, M.FORD, A.FREY, P.GAGNON, J.W.GARY, G.GAYCKEN, C.GEICH-GIMBEL, G.GIACOMELLI, P.GIACOMELLI, M.GIUNTA, J.GOLDBERG, E.GROSS, J.GRUNHAUS, M.GRUW´E, P.O.G¨UNTHER, A.GUPTA, C.HAJDU, M.HAMANN, G.G.HANSON, A.HAREL, M.HAUSCHILD, C.M.HAWKES, R.HAWKINGS, R.J.HEMINGWAY, G.HERTEN, R.D.HEUER, J.C.HILL, K.HOFFMAN, D.HORV´ATH, P. IGO-KEMENES, K. ISHII, H. JEREMIE, P. JOVANOVIC, T.R. JUNK, N.KANAYA, J.KANZAKI, D.KARLEN, K.KAWAGOE, T.KAWAMOTO, R.K.KEELER, R.G.KELLOGG, B.W.KENNEDY, S.KLUTH, T.KOBAYASHI, M.KOBEL, S.KOMAMIYA, T.KR¨AMER, P.KRIEGER, J. VON KROGH, K.KRUGER, T.KUHL, M.KUPPER, G.D. LAFFERTY, H. LANDSMAN, D. LANSKE, J.G. LAYTER, D. LELLOUCH, J. LETTSO, L. LEVINSON, J. LILLICH, S.L. LLOYD, F.K. LOEBINGER, J. LU, A. LUDWIG, J. LUDWIG, W.MADER, S.MARCELLINI, A.J.MARTIN, G.MASETTI, T.MASHIMO, P.M¨ATTIGM, J.MCKENNA, R.A.MCPHERSON, F.MEIJERS, W.MENGES, F.S.MERRITT, H.MES, N.MEYER, A.MICHELINI, S.MIHARA, G.MIKENBERG, D.J.MILLER, S.MOED, W.MOHR, T.MORI, A.MUTTER, K.NAGAI, I.NAKAMURA, H.NANJO, H.A.NEAL, R.NISIUS, S.W.O’NEALE, A.OH, M.J.OREGLIA, S.ORITO, C.PAHL, G.P´ASZTOR, J.R.PATER, J.E.PILCHER, J.PINFOLD, D.E.PLANE, O.POOTH, M.PRZYBYCIE´N, A.QUADT, K.RABBERTZ, C.REMBSER, P.RENKEL, J.M.RONEY, A.M.ROSSI, Y.ROZEN, K.RUNGE, K. SACHS, T. SAEKI, E.K.G. SARKISYAN, A.D. SCHAILE, O. SCHAILE, P. SCHARFF-HANSEN, J. SCHIECK, T. SCH¨ORNER-SADENIUS, M. SCHR¨ODER, M. SCHUMACHER, W.G. SCOTT, R. SEUSTER, T.G. SHEARS, B.C. SHEN, P. SHERWOOD, A. SKUJA, A.M. SMITH, R. SOBIE, S. S¨OLDNER-REMBOLD, F. SPANO, A. STAHL, D. STROM, R. STR¨OHMER, S.TAREM, M.TASEVSKY, R.TEUSCHER, M.A.THOMSON, E.TORRENCE, D.TOYA, P.TRAN, I.TRIGGER, Z.TR´OCS´ANYI, E.TSUR, M.F.TURNER-WATSON, I.UEDA, B.UJV´ARI, C.F.VOLLMER, P.VANNEREM, R.V´ERTESI, M.VERZOCCHI, H.VOSS, J.VOSSEBELD, C.P.WARD, D.R.WARD, P.M.WATKINS, A.T.WATSON, N.K.WATSON, P.S.WELLS, T.WENGLER, N.WERMES, G.W.WILSON, J.A.WILSON, G.WOLF, T.R.WYATT, S.YAMASHITA, D. ZER-ZION, L. ZIVKOVIC, and OPAL Collaboration

Subjects
Physics, Particle physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Hadron, FOS: Physical sciences, Fermion, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Calibration, Radiative transfer, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Beam energy
Abstract

We present a determination of the LEP beam energy using "radiative return" fermion-pair events recorded at centre-of-mass energies from 183 GeV to 209 GeV. We find no evidence of a disagreement between the OPAL data and the LEP Energy Workings Group's standard calibration. Including the energy- averaged 11 MeV uncertainty in the standard determination, the beam energy we obtain from the OPAL data is higher than that obtained from the LEP calibration by 0+-34(stat.)+-27(syst.)MeV, Comment: 24 pages, 5 figures, Submitted to Phys. Letts. B

Published
2004
Full Text
View/download PDF

20. Multi-photon events with large missing energy in e+e− collisions at s=192–209 GeV

Author

James Pinfold, R. Seuster, P. Scharff-Hansen, A. M. Smith, Andris Skuja, Tetsuro Mashimo, M. F. Turner-Watson, N. Meyer, M. Kupper, Daniel Lellouch, Takehiko Mori, L. Brigliadori, T. Behnke, S. W. O'Neale, P. O. Günther, J. Goldberg, M. Boutemeur, F. S. Merritt, K. J. Anderson, Thorsten Wengler, B. C. Shen, M. Donkers, Yoram Rozen, Siegfried Bethke, J. A. McKenna, Tara Shears, W. G. Scott, S. Yamashita, Junichi Kanzaki, Silvia Arcelli, J. W. Gary, P. Igo-Kemenes, K. Buesser, M. Gruwé, K. Ishii, H. Jeremie, Gideon Bella, Gianni Masetti, C. Y. Chang, R. M. Brown, Lorne Levinson, Christoph Rembser, Christoph Geich-Gimbel, Teresa Barillari, H. J. Burckhart, A. Csilling, S. Moed, Gabriele Benelli, Guenter Duckeck, D. Axen, Dezso Horvath, Erez Etzion, Richard Nisius, Graham Wilson, I. R. Bailey, O. Schaile, Oana Elena Vickey Boeriu, Raimund Ströhmer, Stefan Kluth, T. Kuhl, Shlomit Tarem, P. Mättig, Shoji Asai, Marco Cuffiani, Shlomo Dado, Richard Teuscher, A. J. Martin, F. Spano, M. J. Oreglia, M. Hauschild, M. Giunta, D. Zer-Zion, Robert McPherson, L. Zivkovic, Lutz Feld, D. Toya, P. J. Bell, G. Gaycken, W. Mader, Beatrix Dienes, F. K. Loebinger, C. Pahl, Giora Mikenberg, M. Schumacher, Matthias Schröder, Alexander Oh, J. R. Carter, W. Menges, Otmar Biebel, Paolo Giacomelli, Ivor Fleck, J. Ludwig, K. Runge, P. Bock, Georges Azuelos, T. R. Wyatt, I. Nakamura, D. Lanske, T. R. Junk, A. D. Schaile, Joleen Pater, Edward K. G. Sarkisyan, Gabriella Pasztor, K. Hoffman, E. Tsur, Gregor Herten, C. M. Hawkes, E. A. De Wolf, P. Vannerem, H. Nanjo, T. Schörner-Sadenius, Fabrizio Fabbri, A. Frey, Balazs Ujvari, H. A. Neal, Isabel Marian Trigger, K. W. Bell, A. Gupta, C. F. Vollmer, C. P. Ward, P. Gagnon, A. Harel, J. E. Pilcher, J. C. Hill, George Lafferty, Norbert Wermes, T. Kawamoto, Jochen Schieck, Ikuo Ueda, D. M. Strom, R. J. Barlow, J. Lu, Tobias Kramer, P. Amaral, Satoshi Mihara, S. Söldner-Rembold, Gunter Wolf, S. Orito, Zoltan Laszlo Trocsanyi, Kiyotomo Kawagoe, Gideon Alexander, D. Karlen, Frank Fiedler, B. Poli, R. K. Keeler, Dave Charlton, P. S. Wells, Arnulf Quadt, H. Mes, P. M. Watkins, A. T. Watson, Klaus Rabbertz, I. P. Duerdoth, S. Braibant, P. Renkel, Stephen Lloyd, P. Sherwood, Achim Stahl, Oliver Pooth, Ehud Duchovni, John Allison, D. E. Plane, N. Kanaya, A. Michelini, R. G. Kellogg, M. Hamann, R. D. Heuer, Csaba Hajdu, T. Kobayashi, A. Ludwig, Stefano Marcellini, Claudia Ciocca, James Letts, R. Vértesi, R. J. Sobie, Joost Vossebeld, Klaus Desch, P. Tran, K. Sachs, Philip Bechtle, Gordon H. Hanson, D. R. Ward, M. Ford, N. K. Watson, R. J. Batley, S. Campana, C. Ainsley, J. von Krogh, R. J. Hawkings, J. Dubbert, R. K. Carnegie, J. A. Wilson, M. A. Thomson, E. K. U. Gross, Eric Torrence, D. J. Miller, R. J. Hemingway, J. Lillich, B. W. Kennedy, P. Jovanovic, Peter Krieger, M. Przybycień, H. Landsman, A. A. Carter, E. L. Barberio, M. Verzocchi, P. F. Åkesson, Giovanni Abbiendi, J. M. Roney, M. Tasevsky, Koichi Nagai, W. Mohr, J. Grunhaus, A. Mutter, Sachio Komamiya, K. Kruger, T. Saeki, J. G. Layter, Alain Bellerive, G. Anagnostou, H. Voss, G. Giacomelli, Pamela Ferrari, A. De Roeck, M. Kobel, and Frans Meijers

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Missing energy, 010308 nuclear & particles physics, Electron–positron annihilation, 01 natural sciences, 7. Clean energy, Nuclear physics, Massless particle, Pair production, Excited state, 0103 physical sciences, Neutralino, Gravitino, 010306 general physics, Bhabha scattering
Abstract

Events with a final state consisting of two or more photons and large missing transverse energy have been observed in e + e − collisions at centre-of-mass energies in the range 192–209 GeV using the OPAL detector at LEP. Cross-section measurements are performed within the kinematic acceptance of the selection and compared with the expectations from the Standard Model process e + e − → ν ν ¯ γ γ ( γ ) . No evidence for new physics contributions to this final state is observed. Upper limits on σ ( e + e − → X X ) ⋅ BR 2 ( X → Y γ ) are derived for the case of stable and invisible Y. In the case of massive Y the combined limits obtained from all the data range from 10 to 60 fb, while for the special case of massless Y the range is 20 to 40 fb. The limits apply to pair production of excited neutrinos ( X = ν * , Y = ν ), to neutralino production ( X = χ ˜ 2 0 , Y = χ ˜ 1 0 ) and to supersymmetric models in which X = χ ˜ 1 0 and Y = G ˜ is a light gravitino.

Published
2004

21. 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

22. 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

23. Flavour independent search for Higgs bosons decaying into hadronic final states in e+e− collisions at LEP

Author

Silvia Arcelli, N. Kanaya, Daniel Lellouch, Erez Etzion, Gordon H. Hanson, M. Ford, Takehiko Mori, A. Okpara, Stefan Kluth, Shlomit Tarem, T. R. Junk, Christoph Geich-Gimbel, Gregor Herten, R. M. Brown, Lorne Levinson, J. Böhme, M. Giunta, Gianni Masetti, C. Y. Chang, Alexander Oh, C. Pahl, T. Behnke, A. J. Martin, Georges Azuelos, E. Tsur, C. M. Hawkes, J. Goldberg, A. Hocker, S. Moed, G. D. Lafferty, S. Yamashita, E. K. U. Gross, I. R. Bailey, Gideon Bella, H. J. Burckhart, I. Nakamura, D. Lanske, D. R. Ward, K. Hoffman, H. Mes, P. Igo-Kemenes, A. Mutter, J. E. Pilcher, A. D. Schaile, Isabel Marian Trigger, K. W. Bell, M. A. Thomson, Robert McPherson, Gabriella Pasztor, P. Vannerem, Fabrizio Fabbri, A. Frey, Raimund Ströhmer, R. J. Hemingway, I. P. Duerdoth, M. Gruwé, K. Ishii, H. Jeremie, P. Gagnon, S. Braibant, James Pinfold, D. Zer-Zion, W. Mader, J. C. Hill, Lutz Feld, B. W. Kennedy, F. K. Loebinger, J. Lillich, A. Harel, Thorsten Wengler, R. Seuster, Tobias Kramer, Ikuo Ueda, D. M. Strom, D. E. Plane, Klaus Rabbertz, Ivor Fleck, Yoram Rozen, R. K. Keeler, Christoph Rembser, J. M. Roney, M. Boutemeur, F. S. Merritt, J. Lu, Joleen Pater, Edward K. G. Sarkisyan, C. P. Ward, Zoltan Laszlo Trocsanyi, B. Poli, Richard Teuscher, Stephen Lloyd, B. C. Shen, P. Jovanovic, Tara Shears, M. Tasevsky, Beatrix Dienes, Richard Nisius, M. Donkers, P. Tran, O. Schaile, M. Przybycień, A. Klier, R. J. Batley, Balazs Ujvari, H. A. Neal, Arnulf Quadt, Koichi Nagai, W. Mohr, Marco Cuffiani, S. Söldner-Rembold, Gabriele Benelli, Siegfried Bethke, W. G. Scott, Peter Krieger, Junichi Kanzaki, J. W. Gary, P. M. Watkins, T. Kuhl, Paolo Giacomelli, A. A. Carter, Gunter Wolf, N. K. Watson, G. Gaycken, J. A. McKenna, J. Grunhaus, L. Brigliadori, M. Hamann, K. Buesser, M. Schumacher, M. Hauschild, D. Karlen, P. Renkel, Oliver Pooth, C. F. Vollmer, E. A. De Wolf, John Allison, Teresa Barillari, M. Verzocchi, S. W. O'Neale, P. O. Günther, A. Csilling, C. Ainsley, M. J. Oreglia, Dezso Horvath, Stefano Rosati, Jochen Schieck, R. J. Sobie, R. J. Barlow, P. Scharff-Hansen, E. Torrence, A. Gupta, Dave Charlton, P. F. Åkesson, Giovanni Abbiendi, D. Axen, Oana Elena Vickey Boeriu, P. Amaral, Gideon Alexander, K. J. Anderson, F. Spano, R. G. Kellogg, Joost Vossebeld, Sachio Komamiya, Graham Wilson, Matthias Schröder, Klaus Desch, P. J. Bell, Peter Sherwood, Csaba Hajdu, L. Zivkovic, D. J. Miller, Stefano Marcellini, J. Ludwig, P. Mättig, Shoji Asai, Satoshi Mihara, Shlomo Dado, Ehud Duchovni, A. M. Smith, J. R. Carter, Katja Klein, K. Runge, P. Bock, Achim Stahl, James Letts, W. Menges, Otmar Biebel, D. Waller, K. Kruger, T. Saeki, R. D. Heuer, A. Michelini, Andris Skuja, T. Schörner-Sadenius, J. von Krogh, H. Landsman, Guenter Duckeck, Kiyotomo Kawagoe, P. S. Wells, Frank Fiedler, D. Toya, T. Kobayashi, Tetsuro Mashimo, M. F. Turner-Watson, A. Ludwig, Claudia Ciocca, K. Sachs, H. Nanjo, Terry Richard Wyatt, A. T. Watson, S. Campana, Giora Mikenberg, Philip Bechtle, M. Kupper, E. L. Barberio, R. J. Hawkings, Norbert Wermes, T. Kawamoto, D. Wetterling, S. Orito, J. Dubbert, R. K. Carnegie, J. A. Wilson, H. Voss, G. Giacomelli, A. De Roeck, M. Kobel, Frans Meijers, Alain Bellerive, G. Anagnostou, Pamela Ferrari, J. G. Layter, and R. Vértesi

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Branching fraction, High Energy Physics::Phenomenology, Hadron, Scalar boson, 01 natural sciences, Standard Model, Nuclear physics, Pair production, 0103 physical sciences, Higgs boson, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Boson, Event generator
Abstract

A search for the Higgsstrahlung process e + e − → hZ is described, where the neutral Higgs boson h is assumed to decay into hadronic final states. In order to be sensitive to a broad range of models, the search is performed independent of the flavour content of the Higgs boson decay. The analysis is based on e + e − collision data collected by the OPAL detector at energies between 192 and 209 GeV. The search does not reveal any significant excess over the Standard Model background prediction. Results are combined with previous searches at energies around 91 and at 189 GeV. A limit is set on the product of the cross-section and the hadronic branching ratio of the Higgs boson, as a function of the Higgs boson mass. Assuming the hZ coupling predicted by the Standard Model, and a Higgs boson decaying only into hadronic final states, a lower bound of 104 GeV / c 2 is set on the mass at the 95% confidence level.

Published
2004

24. Study of Bose-Einstein correlations in ${\rm e}^ + {\rm e}^-\to {\rm W}^ + {\rm W}^-$ events at LEP

Author

N. Kanaya, Christoph Geich-Gimbel, H. Mes, I. P. Duerdoth, M. J. Oreglia, M. A. Thomson, E. K. U. Gross, Shlomo Dado, S. Braibant, Alexander Oh, R. M. Brown, Lorne Levinson, L. Zivkovic, M. Przybycień, Tara Shears, T. Barillari, Guenter Duckeck, M. Hamann, J. Grunhaus, J. R. Carter, A. Csilling, I. Nakamura, D. Lanske, J. M. Roney, A. A. Carter, B. Poli, Ehud Duchovni, M. Tasevsky, Richard Teuscher, D. Toya, D. R. Ward, Koichi Nagai, I. R. Bailey, Lutz Feld, W. Mohr, M. Verzocchi, S. Yamashita, P. F. Åkesson, Giovanni Abbiendi, Thorsten Wengler, K. Hoffman, P. Igo-Kemenes, R. J. Sobie, C. Pahl, A. Michelini, R. J. Batley, Joost Vossebeld, H. Landsman, W. Menges, Otmar Biebel, Satoshi Mihara, K. Ishii, H. Jeremie, Klaus Desch, Georges Azuelos, E. Tsur, C. F. Vollmer, Gideon Bella, T. R. Wyatt, P. Mättig, Shoji Asai, D. Zer-Zion, Giora Mikenberg, M. Boutemeur, F. S. Merritt, Katja Klein, D. E. Plane, C. M. Hawkes, Pamela Ferrari, J. G. Layter, J. von Krogh, H. J. Burckhart, N. K. Watson, Matthias Schröder, James Pinfold, R. Seuster, G. Gaycken, F. K. Loebinger, Isabel Marian Trigger, K. W. Bell, Jochen Schieck, T. Kobayashi, O. Schaile, M. Schumacher, P. Gagnon, R. J. Hawkings, E. L. Barberio, J. A. McKenna, Frank Fiedler, A. Ludwig, R. J. Barlow, Kiyotomo Kawagoe, Ivor Fleck, J. C. Hill, Yoram Rozen, L. Brigliadori, Tobias Kramer, P. Tran, T. Kuhl, B. C. Shen, E. A. De Wolf, S. Campana, Joleen Pater, P. S. Wells, C. Ainsley, T. Schörner-Sadenius, M. Donkers, J. Dubbert, R. K. Carnegie, Siegfried Bethke, Norbert Wermes, Edward K. G. Sarkisyan, A. T. Watson, P. Amaral, S. W. O'Neale, Andris Skuja, W. G. Scott, Junichi Kanzaki, J. A. Wilson, T. Kawamoto, J. Goldberg, K. Buesser, J. W. Gary, A. D. Schaile, Gabriella Pasztor, Gabriele Benelli, Tetsuro Mashimo, M. F. Turner-Watson, Daniel Lellouch, A. J. Martin, P. O. Günther, Balazs Ujvari, A. Mutter, D. J. Miller, Zoltan Laszlo Trocsanyi, Takehiko Mori, P. Vannerem, H. A. Neal, A. Harel, S. Orito, N. Meyer, Dezso Horvath, Ikuo Ueda, D. M. Strom, J. Lu, M. Kupper, K. J. Anderson, Gideon Alexander, C. P. Ward, W. Mader, Robert McPherson, Dave Charlton, S. Söldner-Rembold, Alain Bellerive, Gianni Masetti, C. Y. Chang, Fabrizio Fabbri, A. Frey, P. Scharff-Hansen, E. Torrence, A. Gupta, Sachio Komamiya, S. Moed, R. D. Heuer, T. R. Junk, A. M. Smith, R. J. Hemingway, G. Anagnostou, Klaus Rabbertz, Stephen Lloyd, Oliver Pooth, Gregor Herten, K. Kruger, T. Saeki, H. Voss, John Allison, J. Lillich, B. W. Kennedy, Raimund Ströhmer, G. Giacomelli, P. Jovanovic, A. De Roeck, M. Kobel, Christoph Rembser, Peter Krieger, J. E. Pilcher, R. G. Kellogg, G. W. Wilson, Frans Meijers, M. Hauschild, Beatrix Dienes, Csaba Hajdu, Erez Etzion, Stefano Marcellini, Stefan Kluth, Shlomit Tarem, James Letts, R. Vértesi, M. Giunta, T. Behnke, Gordon H. Hanson, M. Ford, Thomas Kress, Gunter Wolf, D. Karlen, D. Axen, Oana Elena Vickey Boeriu, F. Spano, Peter Sherwood, J. Ludwig, K. Runge, P. Bock, G. D. Lafferty, R. K. Keeler, Arnulf Quadt, P. M. Watkins, P. Renkel, M. Gruwé, Richard Nisius, Marco Cuffiani, P. J. Bell, Achim Stahl, H. Nanjo, Claudia Ciocca, K. Sachs, Philip Bechtle, and Paolo Giacomelli

Subjects
Condensed Matter::Quantum Gases, Nuclear physics, Physics, Particle physics, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Hadron, Monte Carlo method, High Energy Physics::Experiment, Bose–Einstein correlations, Engineering (miscellaneous), Bar (unit), Boson
Abstract

Bose-Einstein correlations between like-sign charged-particle pairs in e(+)e(-) --> W+ W- events recorded with the OPAL detector at LEP at centre-of-mass energies between 183 GeV and 209 GeV are studied. Recently proposed methods which allow direct searches for correlations in the data via distributions of test variables are used to investigate the presence of correlations between hadrons originating from different W bosons in W+W- --> q (q) over barq (q) over bar events. Within the statistics of the data sample no evidence for inter - WW Bose-Einstein correlations is obtained. The data are also compared with predictions of a recent implementation of Bose-Einstein correlation effects in the Monte Carlo model PYTHIA.

Published
2004

25. Determining resonance parameters of heavy Higgs bosonsat a future linear collider

Author

N. Meyer and Klaus Desch

Subjects
Physics, Particle physics, Physics and Astronomy (miscellaneous), Branching fraction, Electron–positron annihilation, Elementary particle, Nuclear physics, Positron, Mass spectrum, Higgs boson, High Energy Physics::Experiment, Engineering (miscellaneous), Boson, Positron annihilation
Abstract

This study investigates the potential of an Electron-Positron Linear Collider for measuring resonance parameters of Higgs bosons beyond the mass range studied so far. The analysis is based on the reconstruction of events from the Higgs-strahlung process $\mathrm{e}^ + \mathrm{e}^-\to\mathrm{HZ}$ . It is shown that the total width $\Gamma_{tot}^{\mathrm{H}}$ , the mass m H and the event rate N can be measured from the mass spectrum in a model independent way. Also, the branching ratios BR H WW and BR H ZZ can be measured, assuming these are the only relevant Higgs decay modes. The simulation includes realistic detector effects and all relevant Standard Model background processes. Results are given for m H = 200-320 GeV assuming ${\cal \int\!\! L} = 500$ fb-1 integrated luminosity at a collision energy $\sqrt{s} = 500$ GeV.

Published
2004

26. 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

27. Search for the single production of doubly-charged Higgs bosons and constraints on their couplings from Bhabha scattering

Author

C. F. Vollmer, Jochen Schieck, R. J. Barlow, Alexander Oh, I. Nakamura, D. Lanske, Graham Wilson, Gunter Wolf, K. Stephens, N. Kanaya, Tara Shears, Shlomo Dado, D. Karlen, H. Mes, I. P. Duerdoth, S. Braibant, K. Hoffman, A. Leins, P. Gagnon, S. Yamashita, P. Igo-Kemenes, K. Ishii, H. Jeremie, Richard Teuscher, D. Toya, Giora Mikenberg, Arnulf Quadt, O. Schaile, H. Landsman, P. M. Watkins, J. Grunhaus, P. J. Bell, L. Brigliadori, T. Kuhl, R. J. Batley, M. J. Oreglia, A. D. Schaile, Gabriella Pasztor, P. Vannerem, D. R. Ward, Yoram Rozen, Zoltan Laszlo Trocsanyi, Dong Hee Kim, G. Gaycken, L. L. Kormos, G. Anagnostou, Richard J. K. Taylor, Gideon Bella, James Pinfold, R. Seuster, L. Zivkovic, E. L. Barberio, P. Renkel, M. Schumacher, A. J. Martin, H. J. Burckhart, M. Groll, Silvia Arcelli, D. E. Plane, S. W. O'Neale, C. P. Ward, Satoshi Mihara, P. O. Günther, Erez Etzion, J. R. Carter, G. N. Patrick, Katja Klein, Junichi Kanzaki, J. Polok, Stefan Kluth, Shlomit Tarem, W. Menges, Otmar Biebel, S. Söldner-Rembold, Sachio Komamiya, K. Buesser, E. A. De Wolf, Pamela Ferrari, J. G. Layter, M. Giunta, Georges Azuelos, K. J. Anderson, Daniel Lellouch, P. Amaral, J. A. McKenna, W. Mader, E. Tsur, C. M. Hawkes, J. Goldberg, Frank Fiedler, H. Nanjo, D. Waller, Takehiko Mori, A. Okpara, D. Axen, Oana Elena Vickey Boeriu, K. Kruger, T. Saeki, Gianni Masetti, C. Y. Chang, P. Tran, Matthias Schröder, Norbert Wermes, T. Kawamoto, C. Pahl, D. J. Miller, F. Spano, Peter Sherwood, Isabel Marian Trigger, K. W. Bell, G. D. Lafferty, S. Orito, H. Voss, T. J. McMahon, J. C. Hill, J. Ludwig, Christoph Rembser, P. Scharff-Hansen, K. Runge, S. Moed, P. Bock, Tobias Kramer, W. J. McDonald, B. C. Shen, P. F. Åkesson, Klaus Rabbertz, R. J. Hemingway, M. Donkers, Siegfried Bethke, M. A. Thomson, Stephen Lloyd, J. Dubbert, Robert Vertesi, R. K. Carnegie, T. Schörner-Sadenius, J. Lillich, G. Giacomelli, W. G. Scott, Dave Charlton, M. Gruwé, Raimund Ströhmer, A. M. Smith, A. Mutter, C. Hensel, A. De Roeck, M. Kobel, P. Jovanovic, E. K. U. Gross, Peter Krieger, J. W. Gary, Ehud Duchovni, Andris Skuja, T. Behnke, Frans Meijers, Guenter Duckeck, K. Harder, Richard Nisius, Tetsuro Mashimo, M. F. Turner-Watson, A. Macpherson, A. Michelini, Shoji Asai, Marek Tasevsky, Paolo Giacomelli, Dezso Horvath, R. D. Heuer, J. A. Wilson, Marco Cuffiani, M. Kupper, Beatrix Dienes, T. Kobayashi, S. Campana, J. M. Roney, R. M. Brown, Lorne Levinson, M. Harin-Dirac, Koichi Nagai, B. W. Kennedy, I. R. Bailey, W. Mohr, G. Karapetian, Gideon Alexander, Achim Stahl, E. Torrence, A. Gupta, A. Csilling, S. Rosati, A. Harel, Ikuo Ueda, D. M. Strom, J. Lu, M. Hamann, Richard Keeler, R. J. Sobie, Joost Vossebeld, Klaus Desch, T. R. Junk, P. S. Wells, Robert McPherson, J. von Krogh, Terry Richard Wyatt, A. T. Watson, Fabrizio Fabbri, A. Frey, R. J. Hawkings, D. Wetterling, M. Przybycień, A. A. Carter, M. Verzocchi, Giovanni Abbiendi, Christoph Geich-Gimbel, A. Fürtjes, Lutz Feld, M. Boutemeur, F. S. Merritt, Kiyotomo Kawagoe, G. P. Siroli, Christoph Schwick, Thorsten Wengler, B. Caron, Gabriele Benelli, M. Hauschild, Gregor Herten, J. E. Pilcher, N. K. Watson, C. Ainsley, P. Mättig, Alain Bellerive, B. Poli, K. Sachs, Philip Bechtle, Oliver Pooth, John Allison, R. G. Kellogg, Csaba Hajdu, Stefano Marcellini, James Letts, D. Zer-Zion, F. K. Loebinger, Ivor Fleck, Joleen Pater, Edward K. G. Sarkisyan, A. Klier, Balazs Ujvari, H. A. Neal, Gordon H. Hanson, and M. Ford

Subjects
Physics, Particle physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Electron–positron annihilation, High Energy Physics::Phenomenology, Yukawa potential, FOS: Physical sciences, 01 natural sciences, Lepton number, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Higgs boson, High Energy Physics::Experiment, 010306 general physics, Particle Physics - Experiment, Lepton, Event generator, Bhabha scattering, Boson
Abstract

A search for single production of doubly-charged Higgs bosons has been performed using 600.7 pb^-1 of e+e- collision data with sqrt(s)=189--209GeV collected by the OPAL detector at LEP. No evidence for the existence of H++/-- is observed. Upper limits on the Yukawa coupling of the H++/-- to like-signed electron pairs are derived. Additionally, indirect constraints on the Yukawa coupling from Bhabha scattering, where the H++/-- would contribute via t-channel exchange, are derived for M(H++/--) < 2TeV. These are the first results for both a single production search and constraints from Bhabha scattering reported from LEP., 20 pages, 9 figures, Submitted to Phys. Lett. B

Published
2003
Full Text
View/download PDF

28. Search for stable and long-lived massive charged particles in e+e− collisions at =130209 GeV

Author

D. Axen, Oana Elena Vickey Boeriu, James Pinfold, W. J. McDonald, R. Seuster, C. F. Vollmer, F. Spano, Gideon Bella, H. J. Burckhart, Peter Sherwood, B. C. Shen, Jochen Schieck, P. Mättig, Shoji Asai, R. J. Barlow, J. Ludwig, K. Runge, P. Bock, A. D. Schaile, Gabriella Pasztor, G. P. Siroli, Daniel Lellouch, Christoph Schwick, M. Donkers, Takehiko Mori, A. Okpara, Siegfried Bethke, P. Vannerem, P. F. Åkesson, W. G. Scott, D. E. Plane, C. P. Ward, P. Tran, C. Hensel, S. Söldner-Rembold, J. W. Gary, H. Mes, Alexander Oh, Kiyotomo Kawagoe, J. Goldberg, L. L. Kormos, T. Behnke, Oliver Pooth, K. Hoffman, John Allison, I. Nakamura, H. Landsman, S. Yamashita, P. Igo-Kemenes, Ehud Duchovni, A. Leins, D. Lanske, I. P. Duerdoth, S. Braibant, Dave Charlton, A. J. Martin, W. Menges, Otmar Biebel, P. Gagnon, L. Brigliadori, R. K. Keeler, Guenter Duckeck, K. Ishii, H. Jeremie, Marek Tasevsky, Dezso Horvath, E. Torrence, A. Gupta, A. Csilling, Graham Wilson, M. Gruwé, N. K. Watson, Zoltan Laszlo Trocsanyi, Dong Hee Kim, Yoram Rozen, Shlomo Dado, Arnulf Quadt, W. Mader, P. M. Watkins, R. D. Heuer, Richard Nisius, D. Toya, A. Michelini, Tara Shears, R. G. Kellogg, E. L. Barberio, K. Harder, O. Schaile, T. Kuhl, T. Kobayashi, Christoph Rembser, Richard J. K. Taylor, Erez Etzion, Giora Mikenberg, R. J. Batley, Csaba Hajdu, Marco Cuffiani, Junichi Kanzaki, J. Polok, Stefano Marcellini, S. Campana, P. Renkel, R. M. Brown, Stefan Kluth, K. Buesser, G. Gaycken, C. Ainsley, Lorne Levinson, Silvia Arcelli, Shlomit Tarem, James Letts, P. J. Bell, M. A. Thomson, S. W. O'Neale, R. J. Hemingway, I. R. Bailey, Georges Azuelos, M. Schumacher, E. Tsur, E. K. U. Gross, J. Lillich, C. M. Hawkes, P. O. Günther, B. W. Kennedy, E. A. De Wolf, M. Giunta, P. Jovanovic, Isabel Marian Trigger, K. W. Bell, Norbert Wermes, Peter Krieger, T. Kawamoto, Gideon Alexander, Gordon H. Hanson, Gunter Wolf, H. Nanjo, P. Amaral, J. C. Hill, Tobias Kramer, Richard Teuscher, M. Ford, J. M. Roney, K. J. Anderson, C. Pahl, D. Karlen, Koichi Nagai, S. Orito, W. Mohr, Raimund Ströhmer, Klaus Rabbertz, B. Poli, Stephen Lloyd, T. R. Wyatt, George Lafferty, Satoshi Mihara, M. J. Oreglia, Katja Klein, K. Sachs, Philip Bechtle, L. Zivkovic, D. Zer-Zion, J. R. Carter, G. N. Patrick, F. K. Loebinger, Ivor Fleck, Frank Fiedler, K. Stephens, N. Kanaya, Joleen Pater, Edward K. G. Sarkisyan, A. Klier, Beatrix Dienes, Balazs Ujvari, H. A. Neal, M. Boutemeur, F. S. Merritt, Gianni Masetti, C. Y. Chang, D. R. Ward, J. A. McKenna, S. Moed, Christoph Geich-Gimbel, J. Grunhaus, A. Fürtjes, Lutz Feld, M. Hamann, Sachio Komamiya, R. J. Sobie, Thorsten Wengler, Joost Vossebeld, B. Caron, D. Waller, K. Kruger, T. Saeki, Klaus Desch, Gabriele Benelli, P. Scharff-Hansen, A. M. Smith, Andris Skuja, Tetsuro Mashimo, M. F. Turner-Watson, A. Macpherson, T. R. Junk, A. Mutter, M. Kupper, P. S. Wells, M. Hauschild, A. T. Watson, Matthias Schröder, T. J. McMahon, Achim Stahl, D. J. Miller, J. Dubbert, Robert Vertesi, R. K. Carnegie, S. Rosati, J. A. Wilson, Gregor Herten, Robert McPherson, G. Karapetian, A. Harel, T. Schörner-Sadenius, Alain Bellerive, Ikuo Ueda, D. M. Strom, J. Lu, Fabrizio Fabbri, A. Frey, J. E. Pilcher, M. Przybycień, A. A. Carter, M. Verzocchi, G. Anagnostou, Paolo Giacomelli, Giovanni Abbiendi, J. von Krogh, M. Harin-Dirac, R. J. Hawkings, D. Wetterling, Pamela Ferrari, J. G. Layter, H. Voss, G. Giacomelli, A. De Roeck, M. Kobel, and Frans Meijers

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Muon, 010308 nuclear & particles physics, Scalar (mathematics), Supersymmetry, 01 natural sciences, Electric charge, Charged particle, Nuclear physics, Chargino, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Particle Physics - Experiment, Lepton
Abstract

A search for stable and long-lived massive particles of electric charge |Q/e|=1 or fractional charges of 2/3, 4/3, and 5/3 is reported using data collected by the OPAL detector at LEP, at centre-of-mass energies from 130 to 209 GeV. These particles are assumed to be pair-produced in e+e- collisions and not to interact strongly. No evidence for the production of these particles was observed. Model-independent upper limits on the production cross-section between 0.005 and 0.028 pb have been derived for scalar and spin-1/2 particles with charge +-1. Within the framework of the Constrained Minimal Supersymmetric Standard Model (CMSSM), this implies a lower limit of 98.0 (98.5) GeV on the mass of long-lived right (left)- handed scalar muons and scalar taus. Long-lived charged heavy leptons and charginos are excluded for masses below 102.0 GeV. For particles with fractional charge +-2/3, +-4/3, and +-5/3, the upper limit on the production cross-section varies between 0.005 and 0.020 pb. All mass and cross-section limits are derived at the 95% confidence level and are valid for particles with lifetimes longer than 10-6s. A search for stable and long-lived massive particles of electric charge | Q / e |=1 or fractional charges of 2/3, 4/3, and 5/3 is reported using data collected by the OPAL detector at LEP, at centre-of-mass energies from 130 to 209 GeV. These particles are assumed to be pair-produced in e + e − collisions and not to interact strongly. No evidence for the production of these particles was observed. Model-independent upper limits on the production cross-section between 0.005 and 0.028 pb have been derived for scalar and spin-1/2 particles with charge ±1. Within the framework of the Constrained Minimal Supersymmetric Standard Model (CMSSM), this implies a lower limit of 98.0 (98.5) GeV on the mass of long-lived right- (left-)handed scalar muons and scalar taus. Long-lived charged heavy leptons and charginos are excluded for masses below 102.0 GeV. For particles with fractional charge ±2/3, ±4/3 and ±5/3, the upper limit on the production cross-section varies between 0.005 and 0.020 pb. All mass and cross-section limits are derived at the 95% confidence level and are valid for particles with lifetimes longer than 10 −6 s. A search for stable and long-lived massive particles of electric charge |Q/e|=1 or fractional charges of 2/3, 4/3, and 5/3 is reported using data collected by the OPAL detector at LEP, at centre-of-mass energies from 130 to 209 GeV. These particles are assumed to be pair-produced in e+e- collisions and not to interact strongly. No evidence for the production of these particles was observed. Model-independent upper limits on the production cross-section between 0.005 and 0.028 pb have been derived for scalar and spin-1/2 particles with charge +-1. Within the framework of the Constrained Minimal Supersymmetric Standard Model (CMSSM), this implies a lower limit of 98.0 (98.5) GeV on the mass of long-lived right (left)- handed scalar muons and scalar taus. Long-lived charged heavy leptons and charginos are excluded for masses below 102.0 GeV. For particles with fractional charge +-2/3, +-4/3, and +-5/3, the upper limit on the production cross-section varies between 0.005 and 0.020 pb. All mass and cross-section limits are derived at the 95% confidence level and are valid for particles with lifetimes longer than 10-6s.

Published
2003

29. Search for nearly mass-degenerate charginos and neutralinos at LEP

Author

Gordon H. Hanson, M. Ford, D. Zer-Zion, F. K. Loebinger, Ivor Fleck, Joleen Pater, Edward K. G. Sarkisyan, Oliver Pooth, A. Klier, John Allison, Balazs Ujvari, H. A. Neal, Daniele Bonacorsi, Gideon Bella, R. G. Kellogg, Csaba Hajdu, Stefano Marcellini, James Letts, Sachio Komamiya, Graham Wilson, Daniel Lellouch, D. Krop, M. A. Thomson, S. Campana, Raimund Ströhmer, Christoph Geich-Gimbel, S. Yamashita, D. E. Plane, Takehiko Mori, A. Okpara, P. J. Bell, K. Hoffman, A. Leins, N. K. Watson, J. Goldberg, D. Waller, K. Kruger, T. Saeki, H. J. Burckhart, P. Igo-Kemenes, H. Mes, I. P. Duerdoth, E. K. U. Gross, Shlomo Dado, C. F. Vollmer, K. Ishii, H. Jeremie, L. L. Kormos, P. Gagnon, S. Braibant, G. M. Dallavalle, Jochen Schieck, Vakhtang Kartvelishvili, P. Tran, J. von Krogh, A. Fürtjes, A. J. Martin, R. J. Barlow, Beatrix Dienes, A. Mutter, C. Ainsley, P. Scharff-Hansen, K. Stephens, O. Sahr, Lutz Feld, Zoltan Laszlo Trocsanyi, N. Kanaya, M. J. Oreglia, Dong Hee Kim, D. Toya, R. J. Hawkings, J. Hauschildt, P. Hüntemeyer, I. K. Klein, Gianni Masetti, O. Schaile, Christoph Rembser, C. Y. Chang, Richard Teuscher, M. Boutemeur, F. S. Merritt, D. Wetterling, D. J. Miller, Giora Mikenberg, A. M. Smith, J. Grunhaus, S. Moed, R. J. Batley, Paolo Giacomelli, Richard J. K. Taylor, P. F. Åkesson, W. Mader, S.J. Dallison, L. Zivkovic, H. Voss, Erez Etzion, G. Gaycken, S. Spagnolo, J. A. McKenna, M. Harin-Dirac, M. Schumacher, J. R. Carter, Stefan Kluth, Matthias Schröder, R. J. Homer, James Pinfold, R. Seuster, Shlomit Tarem, A. D. Schaile, Gabriella Pasztor, G. N. Patrick, D. R. Ward, R. J. Hemingway, M. Gruwé, W. Menges, Otmar Biebel, P. Vannerem, L. Brigliadori, J. Lillich, C. Hensel, G. Giacomelli, Satoshi Mihara, M. Przybycień, E. A. De Wolf, B. W. Kennedy, T. Kress, M. Giunta, E. Torrence, Achim Stahl, P. Mättig, P. Jovanovic, A. De Roeck, M. Kobel, A. A. Carter, T. Behnke, Shoji Asai, Gideon Alexander, B. Poli, S. W. O'Neale, P. Amaral, A. Gupta, Georges Azuelos, Peter Krieger, R. V. Kowalewski, Richard Nisius, Alexander Oh, Frank Fiedler, I. J. Bloodworth, P. O. Günther, E. Tsur, C. M. Hawkes, T. Schörner-Sadenius, C. P. Ward, Gunter Wolf, Isabel Marian Trigger, K. W. Bell, Andris Skuja, D. Lanske, Marco Cuffiani, M. Verzocchi, J. C. Hill, Tara Shears, Tetsuro Mashimo, S. Söldner-Rembold, Giovanni Abbiendi, D. Axen, K. J. Anderson, Tobias Kramer, W. J. McDonald, B. C. Shen, M. F. Turner-Watson, Frans Meijers, A. Macpherson, Yoram Rozen, Norbert Wermes, H. Landsman, T. Kawamoto, Oana Elena Vickey Boeriu, M. Donkers, Siegfried Bethke, C. H. Shepherd-Themistocleous, W. G. Scott, T. J. McMahon, F. Spano, I. Nakamura, M. Kupper, J. W. Gary, S. Orito, Peter Sherwood, J. Dubbert, R. K. Carnegie, P. Mendez-Lorenzo, Marek Tasevsky, Dezso Horvath, Thomas E Marchant, Guenter Duckeck, E. L. Barberio, J. A. Wilson, J. Ludwig, K. Harder, K. Runge, P. Bock, Dave Charlton, J. M. Roney, Thorsten Wengler, K. Sachs, B. Caron, Pamela Ferrari, J. G. Layter, G. Karapetian, Philip Bechtle, Junichi Kanzaki, J. Polok, D. Karlen, Ehud Duchovni, Koichi Nagai, W. Mohr, R. M. Brown, Lorne Levinson, K. Buesser, Gabriele Benelli, T. R. Junk, R. D. Heuer, A. Michelini, I. R. Bailey, P. S. Wells, T. Kobayashi, M. Hauschild, Terry Richard Wyatt, A. T. Watson, Klaus Rabbertz, Stephen Lloyd, J. P. Martin, Gregor Herten, Alain Bellerive, M. Hamann, J. E. Pilcher, Richard Keeler, G. Anagnostou, R. J. Sobie, Joost Vossebeld, Klaus Desch, R. Howard, A. Tricoli, Robert McPherson, S. Rosati, Arnulf Quadt, Fabrizio Fabbri, A. Frey, E. Elfgren, A. Harel, Ikuo Ueda, D. M. Strom, P. M. Watkins, J. Lu, H. Rick, G. P. Siroli, Christoph Schwick, P. Renkel, Silvia Arcelli, A. Csilling, C. Pahl, G. D. Lafferty, B. Vachon, Kiyotomo Kawagoe, T. Trefzger, Opal, Collaboration, G., Abbiendi, and Spagnolo, Stefania Antonia

Subjects
Physics, Particle physics, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, High Energy Physics::Phenomenology, FOS: Physical sciences, Superpartner, 01 natural sciences, Supersymmetry breaking, High Energy Physics - Experiment, Standard Model, Nuclear physics, High Energy Physics - Experiment (hep-ex), Chargino, 0103 physical sciences, Neutralino, High Energy Physics::Experiment, 010306 general physics, Engineering (miscellaneous), Particle Physics - Experiment, Minimal Supersymmetric Standard Model, Bhabha scattering, Event generator
Abstract

A search was performed for charginos with masses close to the mass of the lightest neutralino in e+e- collisions at centre-of-mass energies of 189-209 GeV recorded by the OPAL detector at LEP. Events were selected if they had an observed high-energy photon from initial state radiation, reducing the dominant background from two-photon scattering to a negligible level. No significant excess over Standard Model expectations has been observed in the analysed data set corresponding to an integrated luminosity of 570pb-1. Upper limits were derived on the chargino pair-productin cross-section, and lower limits on the chargino mass were derived in the context of the Minimal Supersymmetric Extension of the Standard Model for the gravity and anomaly mediated Supersymmetry breaking scenarios., 26 pages, 9 figures

Published
2003

30. Measurement of the branching ratio for →τ decays

Author

J. Letts, A. Leins, Shlomo Dado, K. Graham, Tara Shears, P. Gagnon, D. Toya, A. W. Lloyd, C. Pahl, Paolo Giacomelli, M. Hauschild, Giora Mikenberg, G. D. Lafferty, J. Allison, Zoltan Laszlo Trocsanyi, M. Harin-Dirac, C. H. Shepherd-Themistocleous, Kiyotomo Kawagoe, Dong Hee Kim, R. J. Homer, I. J. Bloodworth, A. K. Honma, O. Runolfsson, Gideon Bella, Claudio Grandi, J. S. White, Claudia Schmitt, W. J. McDonald, B. C. Shen, David Futyan, Yoram Rozen, H. J. Burckhart, D. J. Miller, M. Donkers, Naoko Kanaya, Siegfried Bethke, Alexander Oh, S. Yamashita, P. Igo-Kemenes, M. A. Thomson, P. F. Åkesson, D. Lanske, G. W. Wilson, Junichi Kanzaki, P. G. Estabrooks, R. K. Keeler, G. Gaycken, Gregor Herten, W. G. Scott, J. Polok, D. Karlen, T. Trefzger, S. Spagnolo, K. Ishii, H. Jeremie, S. D. Talbot, C. Hensel, Daniel Lellouch, I. Nakamura, Richard J. K. Taylor, T. Behnke, Takehiko Mori, C. R. Jones, A. Okpara, J. W. Gary, Arnulf Quadt, P. M. Watkins, C. F. Vollmer, T. R. Wyatt, R. J. Barlow, H. Landsman, J. E. Pilcher, Erez Etzion, K. R. Hossain, P. Mättig, D. Zer-Zion, O. Schaile, M. Verzocchi, A. J. Martin, Christoph Geich-Gimbel, P. Mendez-Lorenzo, Thorsten Wengler, Stefan Kluth, Shlomit Tarem, B. Caron, D. Axen, P. Renkel, A. Jawahery, Oana Elena Vickey Boeriu, D. Glenzinski, Marek Tasevsky, F. G. Oakham, A. D. Schaile, Gabriella Pasztor, Dezso Horvath, M. J. Losty, E. L. Barberio, F. Spano, Peter Sherwood, A. Macchiolo, J. Couchman, W. Mader, F. Odorici, T. Kress, B. Surrow, A. A. Carter, P. Vannerem, G. A. Snow, C. P. Ward, J. Ludwig, K. Runge, P. Bock, G. Benelli, L. Brigliadori, Shoji Asai, E. A. De Wolf, S. Rosati, Sachio Komamiya, Giovanni Abbiendi, M. J. Oreglia, A. Csilling, S. Söldner-Rembold, Dave Charlton, J. G. Layter, S. W. O'Neale, K. Hoffman, A. Harel, S.J. Dallison, T. P. Kokott, D. Waller, P. O. Günther, T. Saeki, Rolf Seuster, M. Gruwé, G. N. Patrick, P. E.L. Clarke, Ikuo Ueda, D. M. Strom, K. J. Anderson, V. Kartvelishvili, J. P. Martin, T. Kuhl, R. D. Heuer, Richard Nisius, W. Menges, Achim Stahl, J. Lu, Satoshi Mihara, Guenter Duckeck, H. Rick, C. Y. Chang, Marco Cuffiani, M. Ford, G. Anagnostou, Katja Klein, L. Stumpf, H. Voss, H. Mes, I. P. Duerdoth, S. Braibant, K. Sachs, J. R. Carter, Norbert Wermes, Sherry Towers, T. Kawamoto, G. G. Hanson, N. K. Watson, G. Giacomelli, J. Grunhaus, S. Orito, G. P. Siroli, I. Lawson, Frank Fiedler, A. De Roeck, M. Kobel, Christoph Schwick, J. Böhme, M. S. Dixit, T. R. Junk, Raimund Ströhmer, Richard Teuscher, Frans Meijers, Juergen Thomas, Matthias Schröder, P. S. Wells, T. Kämer, C. Ainsley, P. Hüntemeyer, A. T. Watson, Andris Skuja, A. M. Rossi, Georges Azuelos, B. Vachon, O. Sahr, E. Tsur, C. M. Hawkes, R. Liebisch, Isabel Marian Trigger, K. W. Bell, A. Macpherson, R. J. Hemingway, Tetsuro Mashimo, R. Kowalewski, J. C. Hill, J. Lillich, M. F. Turner-Watson, Beatrix Dienes, Paul Kyberd, F. K. Loebinger, B. W. Kennedy, R. J. Sobie, Joost Vossebeld, P. Jovanovic, E. Torrence, Austin Ball, S. Arcelli, Klaus Desch, R. Howard, Peter Krieger, Alessandro Montanari, M. Kupper, K. Stephens, Ivor Fleck, Joleen Pater, Edward K. G. Sarkisyan, A. Klier, H. A. Neal, Alain Bellerive, N. L. Rodning, Thomas E Marchant, C. Littlewood, P. Dervan, B. Poli, P. Scharff-Hansen, A. M. Smith, Daniele Bonacorsi, D. Krop, J. von Krogh, Gideon Alexander, James Pinfold, R. J. Hawkings, Oliver Pooth, D. Wetterling, Paolo Capiluppi, T. J. McMahon, J. Dubbert, R. K. Carnegie, M. Schumacher, Richard Batley, V. Zacek, J. A. Wilson, D. R. Ward, G. Karapetian, R. G. Kellogg, C. Sbarra, Csaba Hajdu, Stefano Marcellini, J. Goldberg, I. Cohen, Christoph Rembser, A. Fürtjes, Lutz Feld, M. Fanti, Ehud Duchovni, M. Boutemeur, F. S. Merritt, J. A. McKenna, A. Michelini, Robert McPherson, T. Kobayashi, Fabrizio Fabbri, A. Frey, J. Cammin, K. Harder, R. M. Brown, Lorne Levinson, G. D. Long, I. R. Bailey, Klaus Rabbertz, Stephen Lloyd, O. Biebel, D. R. Rust, D. E. Plane, G. M. Dallavalle, K. Roscoe, A. Gupta, E. Clay, J. M. Roney, Koichi Nagai, W. Mohr, P. Ferrari, German Martinez, E. K. U. Gross, and M. Sproston

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Branching fraction, Electron–positron annihilation, Hadron, 01 natural sciences, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Exponential decay, Nuclear Experiment, 010306 general physics
Abstract

Using about 3.9 million hadronic Z decays from e + e − collisions recorded by the OPAL detector at LEP at centre-of-mass energies s ≈M Z , the branching ratio for the decay D − s →τ − ν τ has been measured to be BR ( D − s →τ − ν τ )=(7.0±2.1( stat )±2.0( syst ))%. This result can be used to derive the decay constant of the D − s meson: f D s =(286±44( stat )±41( syst )) MeV .

Published
2001

31. Search for anomalous production of acoplanar di-lepton events in ${\rm e^+e^-}$ collisions at $\sqrt{s} =$ 183 and 189 GeV

Author

P. Ferrari, Randall Sobie, H. Mes, Naoko Kanaya, R. J. Hemingway, G. D. Lafferty, I. P. Duerdoth, S. Braibant, J. Lillich, Christopher Hawkes, German Martinez, K. Stephens, H. O. Ogren, B. W. Kennedy, P. Jovanovic, C. Littlewood, Christoph Geich-Gimbel, Gideon Bella, K. Stoll, Andris Skuja, S. Petzold, Austin Ball, Guenter Duckeck, A. A. Faust, P. Hüntemeyer, Daniel Lellouch, L. Brigliadori, H. J. Burckhart, Jacqueline Batley, Peter R Hobson, D. Zer-Zion, Takehiko Mori, Peter Krieger, Vakhtang Kartvelishvili, Tetsuro Mashimo, S. W. O'Neale, M. F. Turner-Watson, K. J. Anderson, Sachio Komamiya, A. Okpara, P. Mättig, T. J. McMahon, Richard Teuscher, R. Kowalewski, Erez Etzion, M. A. Thomson, A. T. Watson, Matthias Schröder, D. E. Plane, F. Fiedler, M. Thiergen, J. E. Conboy, A. Fürtjes, S. Arcelli, Alessandro Montanari, I. Meyer, C. Couyoumtzelis, T. P. Kokott, J. Dubbert, D. Waller, E. K. U. Gross, M. Verzocchi, W. Gorn, R. K. Carnegie, Shlomit Tarem, Lutz Feld, R. Van Kooten, T. Saeki, G. M. Dallavalle, Alessandra Fanfani, R. Davis, G. Gaycken, P. G. Bright-Thomas, J. A. Wilson, M. Sproston, C. R. Jones, J. Böhme, B. Surrow, M. Schumacher, M. Boutemeur, F. S. Merritt, Gideon Alexander, Thomas E Marchant, Paolo Capiluppi, Michael Hildreth, Achim Stahl, I. Trigger, Stefan Schmitt, Alain Bellerive, M. Kolrep, N. L. Rodning, T. Kuhl, Paul Kyberd, F. K. Loebinger, P. Dervan, S. Yamashita, P. Scharff-Hansen, B. Poli, F. Odorici, K. Graham, F. Wäckerle, D. R. Ward, Tara Shears, H. Voss, R. J. Barlow, Georges Azuelos, Ivor Fleck, Richard Nisius, B. List, Ekg Sarkisyan, D. M. Gingrich, P. Igo-Kemenes, E. Tsur, Ehud Duchovni, D. Axen, A. Jawahery, Oana Elena Vickey Boeriu, J. Grunhaus, J. Bechtluft, J. A. McKenna, D. J. Miller, Joleen Pater, K. W. Bell, J. Goldberg, Dave Charlton, Marco Cuffiani, K. Ishii, H. Jeremie, S. B. Anderson, Shoji Asai, M. Jimack, A. M. Smith, K. Hoffman, A. Klier, A. Michelini, Juergen Thomas, M. Przybycień, H. A. Neal, M. Fanti, T. Kress, J. C. Hill, J. M. Roney, S. Spagnolo, A. M. Rossi, W. R. Gibson, W. J. McDonald, B. C. Shen, A. A. Carter, I. J. Bloodworth, M. Donkers, Kiyotomo Kawagoe, K. Harder, Siegfried Bethke, D. Liu, A. K. Honma, Robert McPherson, Paolo Giacomelli, T. Kobayashi, Stan Bentvelsen, O. Schaile, M. Hansroul, Koichi Nagai, John Allison, W. G. Scott, J. Schieck, R. Hawkings, I. Nakamura, H. Landsman, Peter Sherwood, I. Cohen, R. D. Heuer, Christoph Rembser, James Pinfold, S. Robertson, Yoram Rozen, W. Mohr, Fabrizio Fabbri, A. Frey, R. Perez-Ochoa, R. Seuster, Giovanni Abbiendi, A. J. Martin, Claudia Ciocca, M. Harin-Dirac, S. A. Robins, R. L. Coxe, T. Trefzger, R. J. Homer, R. G. Kellogg, Junichi Kanzaki, J. Polok, R. M. Brown, D. Karlen, D. R. Rust, P. Mendez-Lorenzo, F. G. Oakham, R. Liebisch, K. Ackerstaff, Alexander Wagner, A. Macchiolo, J. Ludwig, A. Hocker, Daniele Bonacorsi, K. Runge, P. Bock, Lorne Levinson, Csaba Hajdu, D. Glenzinski, Dezso Horvath, M. J. Losty, Stefano Marcellini, E. L. Barberio, D. Chrisman, G. D. Long, V. Zacek, K. R. Hossain, W. M. Sang, J. Couchman, W. Mader, O. C. Cooke, P. Pfeifenschneider, J. W. Gary, Marcello Mannelli, C. K. Hargrove, Stephen Lloyd, J. Patt, D. C. Imrie, André Schöning, C. H. Shepherd-Themistocleous, J. von Krogh, O. Sahr, C. Sbarra, F. R. Jacob, G. P. Siroli, M. Gruwé, D. Wetterling, Christoph Schwick, K. Roscoe, P. Gagnon, S. Baumann, E. Torrence, Zoltan Laszlo Trocsanyi, E. Clay, Dong Hee Kim, J. Lauber, E. A. Mckigney, S. D. Talbot, T. Behnke, Satoshi Mihara, T. R. Junk, D. Lanske, D. I. Futyan, P. S. Wells, Terry Richard Wyatt, O. Runolfsson, P. G. Estabrooks, R. K. Keeler, N. K. Watson, Arnulf Quadt, P. M. Watkins, Claudio Grandi, J. S. White, M. Fierro, S. Rosati, A. Harel, Ikuo Ueda, D. M. Strom, A. D. Schaile, Gabriella Pasztor, J. Lu, P. Vannerem, G. A. Snow, C. P. Ward, Raimund Ströhmer, S. Söldner-Rembold, P. Poffenberger, Beatrix Dienes, J. Letts, C. Y. Chang, P. Taras, A. Macpherson, K. Sachs, Shlomo Dado, Giora Mikenberg, Klaus Desch, S. F. Ashby, R. Howard, Otmar Biebel, P. I. Kayal, Norbert Wermes, Sherry Towers, T. Kawamoto, S. Orito, S. Betts, M. Hapke, M. J. Oreglia, Gregor Herten, J. E. Pilcher, A. W. Lloyd, G. W. Wilson, M. Hauschild, S.J. Dallison, J. R. Carter, G. N. Patrick, A. Biguzzi, J. G. Layter, P. E.L. Clarke, J. P. Martin, S. De Jong, H. Rick, G. G. Hanson, G. Giacomelli, I. Lawson, A. De Roeck, M. Kobel, M. S. Dixit, and Frans Meijers

Subjects
Physics, Particle physics, Physics and Astronomy (miscellaneous), Branching fraction, Electron–positron annihilation, High Energy Physics::Phenomenology, Standard Model, Nuclear physics, Chargino, Neutralino, Higgs boson, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous), Minimal Supersymmetric Standard Model, Lepton
Abstract

A selection of di-lepton events with significant missing transverse momentum has been performed using a total data sample of 237.4 pb-1 at e+e- centre-of-rnass energies of approximately 183 GeV and 189 GeV. The observed numbers of events - 78 at 183 GeV and 301 at 189 GeV - are consistent with the numbers expected from Standard Model processes, which arise predominantly from W+W- production with both W bosons decaying leptonically. This topology is also an experimental signature for the pair production of new particles that decay to a charged lepton accompanied by one or more invisible particles. Discrimination techniques are described that optimise the sensitivity to particular new physics channels. No evidence for new phenomena is apparent. Upper limits on the production cross-section times branching ratio squared for sleptons and for leptonically decaying charginos and charged Higgs are presented in a manner intended to minimise the number of model assumptions. Assuming a 100% branching ratio for the decay l±R → l±χ01, where χ01 is the lightest neutralino, we exclude at 95% CL: right-handed smuons with masses below 82.3 GeV for mμ- - mχ01 > 3 GeV and right-handed staus with masses below 81.0 GeV for mτ- -mχ01 > 8 GeV. Right-handed selectrons are excluded at 95% CL for masses below 87.1 GeV for mẽ - mχ01 > 5 GeV, within the framework of the Minimal Supersymmetric Standard Model assuming μ, < - 100 GeV and tan β= 1.5. Charged Higgs bosons, H±, are excluded at 95% CL for masses below 82.8 GeV, assuming a 100% branching ratio for the decay H± → τ ± vτ.

Published
2000

32. A study of $\mathrm{B_s^0}$ meson oscillation using hadronic $\mathrm Z^0$ decays containing leptons

Author

H. O. Ogren, Erez Etzion, Christoph Geich-Gimbel, Shlomit Tarem, Sachio Komamiya, D. Axen, S. Yamashita, A. T. Watson, A. Jawahery, B. Surrow, Richard Teuscher, P. Igo-Kemenes, Vakhtang Kartvelishvili, F. Fiedler, A. Biguzzi, J. E. Conboy, A. Fürtjes, J. G. Layter, K. Ishii, H. Jeremie, Peter Sherwood, Daniele Bonacorsi, J. von Krogh, M. Gruwé, D. Wetterling, T. P. Kokott, T. Saeki, Lutz Feld, Kiyotomo Kawagoe, O. C. Cooke, Alexander Wagner, A. Macchiolo, W. R. Gibson, P. Pfeifenschneider, T. J. McMahon, C. Couyoumtzelis, S. Betts, A. Macpherson, J. Dubbert, J. Ludwig, M. Hapke, K. Harder, S. A. Robins, R. Liebisch, K. Ackerstaff, J. Letts, R. K. Carnegie, G. Gaycken, P. G. Bright-Thomas, J. A. Wilson, J. Böhme, Raimund Ströhmer, M. Kolrep, Alessandra Fanfani, R. Davis, S. Baumann, K. Runge, P. Bock, M. Przybycień, T. Kress, E. A. Mckigney, A. A. Carter, I. J. Bloodworth, J. Patt, André Schöning, O. Schaile, W. J. McDonald, Giovanni Abbiendi, M. Schumacher, Matthias Schröder, B. C. Shen, R. J. Hemingway, M. A. Thomson, J. Lauber, M. Boutemeur, F. S. Merritt, O. Sahr, Klaus Desch, P. E.L. Clarke, R. Howard, S. Robertson, P. Poffenberger, Siegfried Bethke, D. Liu, A. K. Honma, K. R. Hossain, C. H. Shepherd-Themistocleous, K. Sachs, Christopher Hawkes, W. M. Sang, S. B. Anderson, Shlomo Dado, J. Grunhaus, E. K. U. Gross, R. L. Coxe, M. Thiergen, F. Odorici, W. G. Scott, Yoram Rozen, J. P. Martin, B. W. Kennedy, T. Kuhl, S. De Jong, I. Nakamura, Richard Nisius, J. Goldberg, J. Bechtluft, M. Sproston, P. Jovanovic, M. J. Oreglia, Stan Bentvelsen, Austin Ball, K. Stoll, S. D. Talbot, R. M. Brown, Lorne Levinson, Andris Skuja, Peter Krieger, B. List, H. Rick, Marco Cuffiani, P. Mendez-Lorenzo, Junichi Kanzaki, J. Polok, D. I. Futyan, Gregor Herten, K. Hoffman, Giora Mikenberg, S. F. Ashby, D. Glenzinski, Paolo Giacomelli, D. Karlen, T. Behnke, R. D. Heuer, Alessandro Montanari, Daniel Lellouch, T. R. Junk, P. S. Wells, M. Hansroul, Beatrix Dienes, A. Hocker, J. A. McKenna, I. Cohen, S. Petzold, Juergen Thomas, Tetsuro Mashimo, M. F. Turner-Watson, A. D. Schaile, Randall Sobie, G. D. Lafferty, R. Hawkings, Christoph Rembser, Dezso Horvath, M. J. Losty, Takehiko Mori, A. Okpara, Terry Richard Wyatt, P. Mättig, G. D. Long, G. G. Hanson, C. Y. Chang, Gabriella Pasztor, P. Gagnon, H. Landsman, J. M. Roney, M. Verzocchi, J. E. Pilcher, H. Mes, P. G. Estabrooks, R. K. Keeler, N. K. Watson, M. Harin-Dirac, P. Vannerem, G. A. Snow, C. P. Ward, D. C. Imrie, R. J. Homer, G. Giacomelli, I. Lawson, A. De Roeck, M. Kobel, Arnulf Quadt, Naoko Kanaya, P. M. Watkins, Guenter Duckeck, A. Sittler, Zoltan Laszlo Trocsanyi, I. P. Duerdoth, S. Braibant, F. G. Oakham, P. Taras, Dong Hee Kim, Koichi Nagai, J. Schieck, C. Sbarra, F. R. Jacob, Stefan Schmitt, G. P. Siroli, S. Söldner-Rembold, W. Gorn, J. R. Carter, G. N. Patrick, E. L. Barberio, A. J. Martin, M. S. Dixit, Stephen Lloyd, Frans Meijers, Satoshi Mihara, P. Hüntemeyer, Christoph Schwick, K. Roscoe, W. Mohr, John Allison, Otmar Biebel, Georges Azuelos, E. Tsur, Shoji Asai, P. Scharff-Hansen, A. A. Faust, Achim Stahl, O. Runolfsson, K. W. Bell, N. Altekamp, H. Voss, A. W. Lloyd, E. Torrence, R. J. Barlow, D. J. Miller, J. Couchman, W. Mader, Ehud Duchovni, A. M. Smith, R. G. Kellogg, K. Stephens, J. C. Hill, E. Clay, C. K. Hargrove, K. Graham, G. W. Wilson, M. Jimack, Csaba Hajdu, S. Spagnolo, C. Littlewood, Tara Shears, P. I. Kayal, Claudio Grandi, J. S. White, Stefano Marcellini, M. Hauschild, German Martinez, Ekg Sarkisyan, James Pinfold, L. Brigliadori, R. Perez-Ochoa, R. Seuster, V. Gibson, A. Michelini, Norbert Wermes, Sherry Towers, D. E. Plane, T. Kawamoto, D. Lanske, V. Zacek, Paul Kyberd, F. K. Loebinger, I. Trigger, T. Kobayashi, J. W. Gary, J. Steuerer, Ivor Fleck, D. R. Ward, S. Orito, G. M. Dallavalle, Marcello Mannelli, Joleen Pater, A. Klier, H. A. Neal, M. Fierro, R. Kowalewski, S. W. O'Neale, S. Arcelli, K. J. Anderson, Gideon Alexander, Paolo Capiluppi, Gideon Bella, H. J. Burckhart, Jacqueline Batley, C. R. Jones, M. Fanti, Peter R Hobson, D. Zer-Zion, Robert McPherson, Fabrizio Fabbri, A. Frey, R. Van Kooten, Claudia Ciocca, F. Wäckerle, D. M. Gingrich, A. M. Rossi, Michael Hildreth, Alain Bellerive, N. L. Rodning, P. Dervan, B. Poli, D. R. Rust, S. Rosati, A. Harel, Ikuo Ueda, D. M. Strom, and J. Lu

Subjects
Physics, Particle physics, Physics and Astronomy (miscellaneous), Meson, Oscillation, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Charge (physics), Jet (particle physics), Nuclear physics, High Energy Physics::Experiment, Production (computer science), Engineering (miscellaneous), Lepton
Abstract

A sample of \({\rm Z}^0\) decays containing b-flavoured hadrons is tagged using leptons, and events having precise proper time measurements are selected. These events are used to study \({\rm B}^0_{\rm s}\) oscillations. The flavour (b or \(\rm \bar{b}\)) at decay is determined from the lepton charge while the flavour at production is determined from jet charge or the charge of a second lepton, where available. The experiment was not able to resolve the oscillatory behaviour, and we deduce that the \({\rm B}^0_{\rm s}\) oscillation frequency \(\Delta m_{\rm s} > 5.2\) ps\(^{-1}\) at the 95% confidence level.

Published
1999

33. Constrained Supersymmetry after two years of LHC data: a global view with Fittino

Author

Peter Wienemann, N. Nguyen, Carsten Hensel, X. Prudent, Mathias Uhlenbrock, Philip Bechtle, Klaus Desch, Michael Kramer, Herbi K. Dreiner, Werner Porod, Bjorn Sarrazin, Torsten Bringmann, and Matthias Hamer

Subjects
ddc:539, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Dark matter, FOS: Physical sciences, Supersymmetry, 01 natural sciences, Upper and lower bounds, Standard Model, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Supersymmetry Phenomenology, WIMP, 0103 physical sciences, Higgs boson, High Energy Physics::Experiment, ddc:530, Elementary Particles, Quantum Field Theory, Quantum Physics, Quantum Field Theories, String Theory, Classical and Quantum Gravitation, Relativity Theory, 010306 general physics, Minimal Supersymmetric Standard Model
Abstract

We perform global fits to the parameters of the Constrained Minimal Supersymmetric Standard Model (CMSSM) and to a variant with non-universal Higgs masses (NUHM1). In addition to constraints from low-energy precision observables and the cosmological dark matter density, we take into account the LHC exclusions from searches in jets plus missing transverse energy signatures with about 5\,fb$^{-1}$ of integrated luminosity. We also include the most recent upper bound on the branching ratio $B_s\to\mu\mu$ from LHCb. Furthermore, constraints from and implications for direct and indirect dark matter searches are discussed. The best fit of the CMSSM prefers a light Higgs boson just above the experimentally excluded mass. We find that the description of the low-energy observables, $(g-2)_{\mu}$ in particular, and the non-observation of SUSY at the LHC become more and more incompatible within the CMSSM. A potential SM-like Higgs boson with mass around 126 GeV can barely be accommodated. Values for ${\cal B}(B_s\to\mu\mu)$ just around the Standard Model prediction are naturally expected in the best fit region. The most-preferred region is not yet affected by limits on direct WIMP searches, but the next generation of experiments will probe this region. Finally, we discuss implications from fine-tuning for the best fit regions., Comment: 49 pages, 24 figures, to be submitted to JHEP

Published
2012

34. Determination of α S using OPAL hadronic event shapes at $\sqrt{s} = 91\mbox{--}209~\mathrm{GeV}$ and resummed NNLO calculations

Author

P. Scharff-Hansen, Siegfried Bethke, C. Y. Chang, I. Nakamura, D. Axen, Oana Elena Vickey Boeriu, A. M. Smith, Gideon Bella, J. W. Gary, H. J. Burckhart, H. Mes, A. J. Martin, I. P. Duerdoth, Peter Sherwood, Marek Tasevsky, Richard Teuscher, Dezso Horvath, J. Ludwig, K. Runge, P. Bock, D. Zer-Zion, James Pinfold, A. Quadt, R. Seuster, Gunter Wolf, Oliver Pooth, F. K. Loebinger, Ivor Fleck, R. G. Kellogg, Csaba Hajdu, Alexander Oh, Stefano Marcellini, James Letts, Joleen Pater, Edward K. G. Sarkisyan, D. Toya, Graham Wilson, Christoph Geich-Gimbel, Balazs Ujvari, H. A. Neal, Yoram Rozen, D. Karlen, W. Mader, P. J. Bell, M. J. Oreglia, S. Braibant, C. Pahl, G. Mikenberg, R. Vértesi, Shlomo Dado, T. R. Wyatt, Gordon H. Hanson, A. Krasznahorkay, D. Lanske, S. W. O'Neale, Junichi Kanzaki, Sachio Komamiya, Matthias Schröder, M. Gruwe, J. M. Roney, Francesco Spanò, Andris Skuja, K. J. Anderson, Dave Charlton, R. J. Batley, P. Igo-Kemenes, W. Menges, Otmar Biebel, R. K. Keeler, J. Lillich, Koichi Nagai, J. Goldberg, E. Tsur, C. M. Hawkes, P. Gagnon, B. W. Kennedy, Raimund Ströhmer, Tetsuro Mashimo, M. F. Turner-Watson, P. Jovanovic, W. Mohr, K. Ishii, H. Jeremie, A. D. Schaile, Gabriella Pasztor, Isabel Marian Trigger, K. W. Bell, Daniel Lellouch, P. Vannerem, Claudia Ciocca, P. M. Watkins, T. Saeki, J. C. Hill, C. F. Vollmer, M. Boutemeur, F. S. Merritt, N. Meyer, M. Kupper, Peter Krieger, T. Schörner-Sadenius, Zoltan Laszlo Trocsanyi, Takehiko Mori, K. Sachs, J. R. Carter, Tobias Kramer, C. P. Ward, H. Nanjo, Philip Bechtle, Steve Lloyd, Tara Shears, P. Renkel, R. M. Brown, Lorne Levinson, Norbert Wermes, Christoph Rembser, S. Söldner-Rembold, Gideon Alexander, M. A. Thomson, Beatrix Dienes, E. K. U. Gross, H. Voss, Jochen Schieck, S. Campana, O. Schaile, Paolo Capiluppi, T. Kawamoto, I. R. Bailey, M. Schumacher, G. Duckeck, J. A. McKenna, S. Orito, J. Dubbert, Erez Etzion, A. Mutter, Teresa Barillari, Stefan Kluth, Satoru Yamashita, A. Csilling, T. Kuhl, R. J. Barlow, R. K. Carnegie, Shlomit Tarem, E. A. De Wolf, Klaus Rabbertz, M. Giunta, D. E. Plane, N. K. Watson, P. Mättig, D. J. Miller, Shoji Asai, T. Behnke, L. Zivkovic, J. A. Wilson, J. Grunhaus, M. Dallavalle, H. Landsman, C. Ainsley, A. M. Rossi, Ehud Duchovni, Marco Cuffiani, A. Michelini, E. L. Barberio, T. Kobayashi, A. Ludwig, E. Torrence, A. Gupta, Paolo Giacomelli, D. R. Ward, Alain Bellerive, George Lafferty, M. Przybycień, G. Anagnostou, A. A. Carter, Satoshi Mihara, Achim Stahl, G. Giacomelli, M. Verzocchi, P. F. Åkesson, Giovanni Abbiendi, Frank Fiedler, A. De Roeck, M. Kobel, Frans Meijers, M. Ford, Pamela Ferrari, J. von Krogh, R. J. Hawkings, Kiyotomo Kawagoe, Robert McPherson, R. D. Heuer, Fabrizio Fabbri, A. Frey, M. Hamann, R. J. Sobie, Joost Vossebeld, Klaus Desch, A. Harel, Ikuo Ueda, D. M. Strom, J. Lu, P. S. Wells, A. T. Watson, M. Hauschild, T. R. Junk, Thorsten Wengler, Gabriele Benelli, Gregor Herten, J. E. Pilcher, B. C. Shen, G. Abbiendi, C. Ainsley, P. F. Åkesson, G. Alexander, G. Anagnostou, K. J. Anderson, S. Asai, D. Axen, I. Bailey, E. Barberio, T. Barillari, R. J. Barlow, R. J. Batley, P. Bechtle, T. Behnke, K. W. Bell, P. J. Bell, G. Bella, A. Bellerive, G. Benelli, S. Bethke, O. Biebel, O. Boeriu, P. Bock, M. Boutemeur, S. Braibant, R. M. Brown, H. J. Burckhart, S. Campana, P. Capiluppi, R. K. Carnegie, A. A. Carter, J. R. Carter, C. Y. Chang, D. G. Charlton, C. Ciocca, A. Csilling, M. Cuffiani, S. Dado, M. Dallavalle, A. Roeck, E. A. Wolf, K. Desch, B. Diene, J. Dubbert, E. Duchovni, G. Duckeck, I. P. Duerdoth, E. Etzion, F. Fabbri, P. Ferrari, F. Fiedler, I. Fleck, M. Ford, A. Frey, P. Gagnon, J. W. Gary, C. Geich-Gimbel, G. Giacomelli, P. Giacomelli, M. Giunta, J. Goldberg, E. Gro, J. Grunhau, M. Gruwé, A. Gupta, C. Hajdu, M. Hamann, G. G. Hanson, A. Harel, M. Hauschild, C. M. Hawke, R. Hawking, G. Herten, R. D. Heuer, J. C. Hill, D. Horváth, P. Igo-Kemene, K. Ishii, H. Jeremie, P. Jovanovic, T. R. Junk, J. Kanzaki, D. Karlen, K. Kawagoe, T. Kawamoto, R. K. Keeler, R. G. Kellogg, B. W. Kennedy, S. Kluth, T. Kobayashi, M. Kobel, S. Komamiya, T. Krämer, A. Krasznahorkay, P. Krieger, J. Krogh, T. Kuhl, M. Kupper, G. D. Lafferty, H. Landsman, D. Lanske, D. Lellouch, J. Lett, L. Levinson, J. Lillich, S. L. Lloyd, F. K. Loebinger, J. Lu, A. Ludwig, J. Ludwig, W. Mader, S. Marcellini, A. J. Martin, T. Mashimo, P. Mättig, J. McKenna, R. A. McPherson, F. Meijer, W. Menge, F. S. Merritt, H. Me, N. Meyer, A. Michelini, S. Mihara, G. Mikenberg, D. J. Miller, W. Mohr, T. Mori, A. Mutter, K. Nagai, I. Nakamura, H. Nanjo, H. A. Neal, S. W. O’Neale, A. Oh, M. J. Oreglia, S. Orito, C. Pahl, G. Pásztor, J. R. Pater, J. E. Pilcher, J. Pinfold, D. E. Plane, O. Pooth, M. Przybycień, A. Quadt, K. Rabbertz, C. Rembser, P. Renkel, J. M. Roney, A. M. Rossi, Y. Rozen, K. Runge, K. Sach, T. Saeki, E. K. G. Sarkisyan, A. D. Schaile, O. Schaile, P. Scharff-Hansen, J. Schieck, T. Schörner-Sadeniu, M. Schröder, M. Schumacher, R. Seuster, T. G. Shear, B. C. Shen, P. Sherwood, A. Skuja, A. M. Smith, R. Sobie, S. Söldner-Rembold, F. Spano, A. Stahl, D. Strom, R. Ströhmer, S. Tarem, M. Tasevsky, R. Teuscher, M. A. Thomson, E. Torrence, D. Toya, I. Trigger, Z. Trócsányi, E. Tsur, M. F. Turner-Watson, I. Ueda, B. Ujvári, C. F. Vollmer, P. Vannerem, R. Vértesi, M. Verzocchi, H. Vo, J. Vossebeld, C. P. Ward, D. R. Ward, P. M. Watkin, A. T. Watson, N. K. Watson, P. S. Well, T. Wengler, N. Werme, G. W. Wilson, J. A. Wilson, G. Wolf, T. R. Wyatt, S. Yamashita, D. Zer-Zion, and L. Zivkovic

Subjects
Quantum chromodynamics, Physics, Particle physics, Annihilation, OPAL, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Electron–positron annihilation, Hadron, Nuclear Theory, LEP, 01 natural sciences, Asymptotic freedom, Nuclear physics, Renormalization, ALFA_S, 0103 physical sciences, High Energy Physics::Experiment, Gauge theory, 010306 general physics, Event (particle physics), Engineering (miscellaneous)
Abstract

Hadronic event shape distributions from e+e− annihilation measured by the OPAL experiment at centre-of-mass energies between 91 GeV and 209 GeV are used to determine the strong coupling α S. The results are based on QCD predictions complete to the next-to-next-to-leading order (NNLO), and on NNLO calculations matched to the resummed next-to-leading-log-approximation terms (NNLO + NLLA). The combined NNLO result from all variables and centre-of-mass energies is while the combined NNLO + NLLA result is The completeness of the NNLO and NNLO + NLLA results with respect to missing higher order contributions, studied by varying the renormalization scale, is improved compared to previous results based on NLO or NLO + NLLA predictions only. The observed energy dependence of α S agrees with the QCD prediction of asymptotic freedom and excludes the absence of running.

Published
2011

36. Extracting SUSY parameters from LHC measurements using Fittino

Author

Philip Bechtle, Klaus Desch, Mathias Uhlenbrock, Peter Wienemann, George Alverson, Pran Nath, and Brent Nelson

Subjects
Physics, Particle physics, Luminosity (scattering theory), Large Hadron Collider, High Energy Physics::Phenomenology, FOS: Physical sciences, Function (mathematics), Supersymmetry, High Energy Physics - Phenomenology, High Energy Physics::Theory, High Energy Physics - Phenomenology (hep-ph), High Energy Physics::Experiment, Point (geometry), Mass scale, Projection (set theory)
Abstract

We show that presently available precision data are in good agreement with supersymmetry at a mass scale below 1 TeV. Using a SUSY point close to the best fit to present data, we give a projection of the capabilities of the LHC to constrain SUSY models and their parameters as function of the accumulated luminosity., 4 pages, contribution to the proceedings of the 17th International Conference on Supersymmetry and the Unification of Fundamental Interactions (SUSY09), Northeastern University, Boston, MA, USA, June 2009

Published
2010

37. Constraining SUSY models with Fittino using measurements before, with and beyond the LHC

Author

Klaus Desch, Philip Bechtle, Mathias Uhlenbrock, and Peter Wienemann

Subjects
Physics, Particle physics, Muon, Large Hadron Collider, Physics and Astronomy (miscellaneous), Anomalous magnetic dipole moment, Supergravity, High Energy Physics::Phenomenology, FOS: Physical sciences, Supersymmetry, law.invention, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), law, Point (geometry), High Energy Physics::Experiment, Collider, Engineering (miscellaneous), Order of magnitude
Abstract

We investigate the constraints on Supersymmetry arising from available precision measurements using a global fit approach. When interpreted within minimal supergravity (mSUGRA), the data provide significant constraints on the masses of supersymmetric particles, which are predicted to be light enough for an early discovery at the Large Hadron Collider (LHC). We provide predicted mass spectra including, for the first time, full uncertainty bands. The most stringent constraint is from the measurement of the anomalous magnetic moment of the muon. Using the results of these fits, we investigate to which precision mSUGRA and more general MSSM parameters can be measured by the LHC experiments with three different integrated luminosities for a parameter point which approximately lies in the region preferred by current data. The impact of the already available measurements on these precisions, when combined with LHC data, is also studied. We develop a method to treat ambiguities arising from different interpretations of the data within one model and provide a way to differentiate between values of different digital parameters of a model. Finally, we show how measurements at a linear collider with up to 1 TeV centre-of-mass energy will help to improve precision by an order of magnitude., Comment: submitted to EPJ C

Published
2009
Full Text
View/download PDF

38. Sigma-antihyperon correlations in Z0 decay and investigation of the baryon production mechanism

Author

G. W. Wilson, M. Schumacher, M. Hauschild, Teresa Barillari, W. Menges, Otmar Biebel, E. A. De Wolf, Oliver Pooth, J. Grunhaus, L. Zivkovic, B. Dienes, J. A. McKenna, P. Mättig, Shoji Asai, Norbert Wermes, T. Kawamoto, S. Orito, M. Dallavalle, H. Landsman, E. L. Barberio, R. G. Kellogg, Attila Krasznahorkay, H. Mes, I. P. Duerdoth, J. Lillich, J. M. Roney, B. W. Kennedy, P. Jovanovic, Peter Krieger, A. J. Martin, A. Harel, Thorsten Wengler, Dave Charlton, Csaba Hajdu, Stefano Marcellini, James Letts, N. K. Watson, Daniel Lellouch, Guenter Duckeck, Ikuo Ueda, D. M. Strom, D. J. Miller, J. Lu, D. Axen, Christoph Geich-Gimbel, Oana Elena Vickey Boeriu, Koichi Nagai, K. Ishii, H. Jeremie, Takehiko Mori, G. Mikenberg, W. Mader, Sachio Komamiya, M. Gruwe, F. Spano, W. Mohr, Peter Sherwood, Tara Shears, R. J. Batley, Gabriele Benelli, Robert McPherson, P. Scharff-Hansen, R. D. Heuer, C. Ainsley, M. J. Oreglia, S. Braibant, Gordon H. Hanson, E. Tsur, C. M. Hawkes, O. Schaile, C. F. Vollmer, Richard Teuscher, J. Ludwig, K. Runge, P. Bock, T. Saeki, T. Kuhl, A. M. Rossi, M. A. Thomson, Rolf Seuster, Isabel Marian Trigger, K. W. Bell, Yoram Rozen, E. K. U. Gross, H. Voss, D. Zer-Zion, A. M. Smith, Kiyotomo Kawagoe, Gregor Herten, Gideon Bella, H. J. Burckhart, J. C. Hill, Jochen Schieck, R. J. Barlow, J. Goldberg, Junichi Kanzaki, F. K. Loebinger, Fabrizio Fabbri, A. Frey, Satoru Yamashita, Matthias Schröder, Tobias Kramer, B. C. Shen, Ivor Fleck, Andris Skuja, Joleen Pater, Balazs Ujvari, J. E. Pilcher, Edward K. G. Sarkisyan, D. Toya, M. Boutemeur, F. S. Merritt, Siegfried Bethke, Tetsuro Mashimo, M. F. Turner-Watson, H. A. Neal, A. Mutter, T. Schörner-Sadenius, I. Nakamura, N. Meyer, S. Campana, J. W. Gary, M. Kupper, T. Behnke, T. R. Junk, James Pinfold, A. Quadt, P. S. Wells, Alexander Oh, Terry Richard Wyatt, A. T. Watson, Marco Cuffiani, Claudia Ciocca, P. Gagnon, M. Hamann, K. Sachs, J. R. Carter, D. Lanske, Philip Bechtle, Marek Tasevsky, Christoph Rembser, C. Pahl, R. J. Sobie, G. D. Lafferty, Joost Vossebeld, Klaus Desch, Erez Etzion, R. K. Keeler, Zoltan Laszlo Trocsanyi, P. J. Bell, Stefan Kluth, P. M. Watkins, Shlomit Tarem, P. Renkel, M. Giunta, Dezso Horvath, Gunter Wolf, D. Karlen, Gideon Alexander, Paolo Capiluppi, H. Nanjo, P. Igo-Kemenes, M. Przybycień, Ehud Duchovni, A. Michelini, A. A. Carter, T. Kobayashi, A. Ludwig, M. Verzocchi, P. F. Åkesson, Giovanni Abbiendi, Klaus Rabbertz, Stephen Lloyd, J. Dubbert, Robert Vertesi, R. K. Carnegie, J. A. Wilson, M. Ford, J. von Krogh, R. J. Hawkings, D. Wetterling, E. Torrence, A. Gupta, Alain Bellerive, A. Csilling, G. Anagnostou, Pamela Ferrari, D. E. Plane, Shlomo Dado, G. Giacomelli, A. De Roeck, M. Kobel, Frans Meijers, R. M. Brown, Lorne Levinson, A. D. Schaile, Paolo Giacomelli, Gabriella Pasztor, P. Vannerem, I. R. Bailey, C. P. Ward, S. Söldner-Rembold, Achim Stahl, C. Y. Chang, Raimund Ströhmer, S. W. O'Neale, K. J. Anderson, D. R. Ward, Satoshi Mihara, Frank Fiedler, OPAL Collaboration, G. ABBIENDI, C. AINSLEY, P. F. ÅKESSON, G. ALEXANDER, G. ANAGNOSTOU, K. J. ANDERSON, S. ASAI, D. AXEN, I. BAILEY, E. BARBERIO, T. BARILLARI, R. J. BARLOW, R. J. BATLEY, P. BECHTLE, T. BEHNKE, K. W. BELL, P. J. BELL, G. BELLA, A. BELLERIVE, G. BENELLI, S. BETHKE, O. BIEBEL, O. BOERIU, P. BOCK, M. BOUTEMEUR, S. BRAIBANT, R. M. BROWN, H. J. BURCKHAR, S. CAMPANA, P. CAPILUPPI, R. K. CARNEGIE, A. A. CARTER, J. R. CARTER, C. Y. CHANG, D. G. CHARLTON, C. CIOCCA, A. CSILLING, M. CUFFIANI, S. DADO, M. DALLAVALLE, A. DE ROECK, E. A. DE WOLF, K. DESCH, B. DIENES, J. DUBBERT, E. DUCHOVNI, G. DUCKECK, I. P. DUERDOTH, E. ETZION, F. FABBRI, P. FERRARI, F. FIEDLER, I. FLECK, M. FORD, A. FREY, P. GAGNON, J. W. GARY, C. GEICH-GIMBEL, G. GIACOMELLI, P. GIACOMELLI, M. GIUNTA, J. GOLDBERG, E. GROSS, J. GRUNHAUS, M. GRUWÉ, A. GUPT, C. HAJDU, M. HAMANN, G. G. HANSON, A. HAREL, M. HAUSCHILD, C. M. HAWKES, R. HAWKINGS, G. HERTEN, R. D. HEUER, J. C. HILL, D. HORVÁTH, P. IGO-KEMENES, K. ISHII, H. JEREMIE, P. JOVANOVIC, T. R. JUNK, J. KANZAKI, D. KARLEN, K. KAWAGOE, T. KAWAMOTO, R. K. KEELER, R. G. KELLOGG, B. W. KENNEDY, S. KLUTH, T. KOBAYASHI, M. KOBEL, S. KOMAMIYA, T. KRÄMER, A. KRASZNAHORKAY JR., P. KRIEGER, J. VON KROGH, T. KUHL, M. KUPPER, G. D. LAFFERTY, H. LANDSMAN, D. LANSKE, D. LELLOUCH, J. LETTS, L. LEVINSON, J. LILLICH, S. L. LLOYD, F. K. LOEBINGER, J. LU, A. LUDWIG, J. LUDWIG, W. MADER, S. MARCELLINI, A. J. MARTIN, T. MASHIMO, P. MÄTTIG, J. MCKENNA, R. A. MCPHERSON, F. MEIJERS, W. MENGES, F. S. MERRITT, H. MES, N. MEYER, A. MICHELINI, S. MIHARA, G. MIKENBERG, D. J. MILLER, W. MOHR, T. MORI, A. MUTTER, K. NAGAI, I. NAKAMURA, H. NANJO, H. A. NEAL, S. W. O’NEALE, A. OH, M. J. OREGLIA, S. ORITO, C. PAHL, G. PÁSZTOR, J. R. PATER, J. E. PILCHER, J. PINFOLD, D. E. PLANE, O. POOTH, M. PRZYBYCIEń, A. QUADT, K. RABBERTZ, C. REMBSER, P. RENKEL, J. M. RONEY, A. M. ROSSI, Y. ROZEN, K. RUNGE, K. SACHS, T. SAEKI, E. K. G. SARKISYAN, A. D. SCHAILE, O. SCHAILE, P. SCHARFF-HANSEN, J. SCHIECK, T. SCHÖRNER-SADENIUS, M. SCHRÖDER, M. SCHUMACHER, R. SEUSTER, T. G. SHEARS, B. C. SHEN, P. SHERWOOD, A. SKUJA, A. M. SMITH, R. SOBIE, S. SÖLDNER-REMBOLD, F. SPANO, A. STAHL, D. STROM, R. STRÖHMER, S. TAREM, M. TASEVSKY, R. TEUSCHER, M. A. THOMSON, E. TORRENCE, D. TOYA, I. TRIGGER, Z. TRÓCSÁNYI, E. TSUR, M. F. TURNER-WATSON, I. UEDA, B. UJVÁRI, C. F. VOLLMER, P. VANNEREM, R. VÉRTESI, M. VERZOCCHI, H. VOSS, J. VOSSEBELD, C. P. WARD, D. R. WARD, P. M. WATKINS, A. T. WATSON, N. K. WATSON, P. S. WELLS, T. WENGLER, N. WERMES, D. WETTERLING, G. W. WILSON, J. A. WILSON, G. WOLF, T. R. WYATT, S. YAMASHITA, D. ZER-ZION, and L. ZIVKOVIC

Subjects
Particle physics, Physics and Astronomy (miscellaneous), Nuclear Theory, FOS: Physical sciences, Fizikai tudományok, Context (language use), Lambda, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Természettudományok, 0103 physical sciences, ddc:530, Rapidity, 010306 general physics, Nuclear Experiment, Engineering (miscellaneous), Physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Hyperon, 3. Good health, Hadronization, Baryon, Diquark, High Energy Physics::Experiment, Baryon number, Particle Physics - Experiment
Abstract

Data collected around sqrt{s}=91 GeV by the OPAL experiment at the LEP e+e- collider are used to study the mechanism of baryon formation. As the signature, the fraction of Sigma-hyperons whose baryon number is compensated by the production of a Sigma-, Lambda or Xi- antihyperon is determined. The method relies entirely on quantum number correlations of the baryons, and not rapidity correlations, making it more model independent than previous studies. The diquark fragmentation model without the popcorn mechanism is strongly disfavored with a significance of 3.8 standard deviations including systematic uncertainties. It is shown that previous studies of the popcorn mechanism are not conclusive if parameter uncertainties are considered., Comment: No of pages 31 - No of figures 7

Published
2009
Full Text
View/download PDF

39. Measurement of <tex>\alpha_{s}$</tex> with radiative hadronic events

Author

Sachio Komamiya, M. Gruwe, A. D. Schaile, Gabriella Pasztor, P. Vannerem, M. A. Thomson, A. J. Martin, E. K. U. Gross, H. Voss, C. F. Vollmer, C. P. Ward, T. Saeki, James Pinfold, A. Quadt, R. Seuster, Jochen Schieck, S. Söldner-Rembold, R. J. Barlow, Satoru Yamashita, W. Mader, Yoram Rozen, R. Vértesi, J. Lillich, B. W. Kennedy, P. Jovanovic, M. Dallavalle, H. Landsman, T. Behnke, Graham Wilson, E. L. Barberio, Guenter Duckeck, M. Boutemeur, F. S. Merritt, Gordon H. Hanson, Peter Krieger, Shlomo Dado, Junichi Kanzaki, Tara Shears, Marco Cuffiani, P. Gagnon, J. M. Roney, S. Campana, W. Menges, Otmar Biebel, Andris Skuja, D. J. Miller, P. Igo-Kemenes, E. Tsur, C. M. Hawkes, Oliver Pooth, Tetsuro Mashimo, M. F. Turner-Watson, K. Ishii, H. Jeremie, T. R. Junk, Isabel Marian Trigger, K. W. Bell, Zoltan Laszlo Trocsanyi, Koichi Nagai, Daniel Lellouch, W. Mohr, P. J. Bell, Gunter Wolf, Gregor Herten, Takehiko Mori, J. C. Hill, C. Pahl, N. Meyer, A. Mutter, Alexander Oh, M. Kupper, Tobias Kramer, Matthias Schröder, O. Schaile, H. Mes, Dave Charlton, I. P. Duerdoth, D. Axen, I. Nakamura, R. G. Kellogg, T. Kuhl, B. C. Shen, Oana Elena Vickey Boeriu, D. Lanske, Csaba Hajdu, Peter Sherwood, J. A. McKenna, J. E. Pilcher, Siegfried Bethke, Stefano Marcellini, James Letts, J. Ludwig, P. Scharff-Hansen, R. K. Keeler, H. Nanjo, J. W. Gary, K. Runge, P. Bock, D. Karlen, Richard Teuscher, Teresa Barillari, G. Mikenberg, M. Hauschild, R. D. Heuer, A. Csilling, Marek Tasevsky, T. Schörner-Sadenius, D. Zer-Zion, P. M. Watkins, Dezso Horvath, F. K. Loebinger, Gideon Bella, A. M. Smith, Ehud Duchovni, T. R. Wyatt, H. J. Burckhart, P. Renkel, Ivor Fleck, Thorsten Wengler, Joleen Pater, Norbert Wermes, P. Mättig, R. J. Batley, T. Kawamoto, Shoji Asai, Edward K. G. Sarkisyan, D. Toya, J. Grunhaus, Balazs Ujvari, H. A. Neal, M. Schumacher, Gabriele Benelli, J. Goldberg, S. Orito, E. A. De Wolf, L. Zivkovic, Christoph Rembser, Christoph Geich-Gimbel, M. J. Oreglia, S. W. O'Neale, S. Braibant, Erez Etzion, Stefan Kluth, Shlomit Tarem, A. Krasznahorkay, M. Giunta, A. Michelini, Francesco Spanò, K. J. Anderson, Raimund Ströhmer, T. Kobayashi, A. Ludwig, E. Torrence, A. Gupta, Kiyotomo Kawagoe, Beatrix Dienes, C. Y. Chang, R. M. Brown, Lorne Levinson, I. R. Bailey, D. E. Plane, Alan Watson, Gideon Alexander, Paolo Capiluppi, Klaus Rabbertz, Stephen Lloyd, N. K. Watson, D. R. Ward, C. Ainsley, A. M. Rossi, George Lafferty, Satoshi Mihara, Frank Fiedler, Claudia Ciocca, M. Przybycień, K. Sachs, J. R. Carter, Philip Bechtle, A. A. Carter, Robert McPherson, Fabrizio Fabbri, A. Frey, M. Verzocchi, P. F. Åkesson, Giovanni Abbiendi, Paolo Giacomelli, Alain Bellerive, J. Dubbert, R. K. Carnegie, J. A. Wilson, G. Anagnostou, Pamela Ferrari, M. Ford, J. von Krogh, G. Giacomelli, R. J. Hawkings, A. De Roeck, M. Kobel, Frans Meijers, Achim Stahl, P. S. Wells, A. Harel, Ikuo Ueda, D. M. Strom, J. Lu, M. Hamann, R. J. Sobie, Joost Vossebeld, Klaus Desch, G.ABBIENDI, C.AINSLEY, P.F.AKESSON, G.ALEXANDER, G.ANAGNOSTOU, K.J.ANDERSON, S.ASAI, D.AXEN, I.BAILEY, E.BARBERIO, T.BARILLARI, R.J.BARLOW, R.J.BATLEY, P.BECHTLE, T.BEHNKE, K.W.BELL, P.J.BELL, G.BELLA, A.BELLERIVE, G.BENELLI, S.BETHKE, O.BIEBEL, O.BOERIU, P.BOCK, M.BOUTEMEUR, S.BRAIBANT, R.M.BROWN, H.J.BURCKHART, S.CAMPANA, P.CAPILUPPI, R.K.CARNEGIE, A.A.CARTER, J.R.CARTER, C.Y.CHANG, D.G.CHARLTON, C.CIOCCA, A.CSILLING, M.CUFFIANI, S.DADO, A.DE ROECK, E.A.DE WOLF, K.DESCH, B.DIENES, J.DUBBERT, E.DUCHOVNI, G.DUCKECK, I.P.DUERDOTH, E.ETZION, F.FABBRI, P.FERRARI, F.FIEDLER, I.FLECK, M.FORD, A.FREY, P.GAGNON, J.W.GARY, C.GEICH-GIMBEL, G.GIACOMELLI, P.GIACOMELLI, M.GIUNTA, J.GOLDBERG, E.GROSS, J.GRUNHAUS, M.GRUW, P.O.GUNTHER, A.GUPTA, C.HAJDU, M.HAMANN, G.G.HANSON, A.HAREL, M.HAUSCHILD, C.M.HAWKES, R.HAWKINGS, R.J.HEMINGWAY, G.HERTEN, R.D.HEUER, J.C.HILL, D.HORVATH, P. IGO-KEMENES, K. ISHII, H. JEREMIE, P. JOVANOVIC, T.R. JUNK, J.KANZAKI, D.KARLEN, K.KAWAGOE, T.KAWAMOTO, R.K.KEELER, R.G.KELLOGG, B.W.KENNEDY, S.KLUTH, T.KOBAYASHI, M.KOBEL, S.KOMAMIYA, T.KRAMER, A.KRASZNAHORKAY, P.KRIEGER, J. VON KROGH, T.KUHL, M.KUPPER, G.D. LAFFERTY, H. LANDSMAN, D. LANSKE, D. LELLOUCH, J. LETTSO, L. LEVINSON, J. LILLICH, S.L. LLOYD, F.K. LOEBINGER, J. LU27, A. LUDWIG, J. LUDWIG, W.MADER, S.MARCELLINI, A.J.MARTIN, T.MASHIMO, P.MATTIGM, J.MCKENNA, R.A.MCPHERSON, F.MEIJERS, W.MENGES, F.S.MERRITT, H.MES, N.MEYER, A.MICHELINI, S.MIHARA, G.MIKENBERG, D.J.MILLER, W.MOHR, T.MORI, A.MUTTER, K.NAGAI, I.NAKAMURA, H.NANJO, H.A.NEAL, R.NISIUS, S.W.O’NEALE, A.OH, M.J.OREGLIA, S.ORITO, C.PAHL, G.PASZTOR, J.R.PATER, J.E.PILCHER, J.PINFOLD, D.E.PLANE, O.POOTH, M.PRZYBYCIEN, A.QUADT, K.RABBERTZ, C.REMBSER, P.RENKEL, J.M.RONEY, A.M.ROSSI, Y.ROZEN, K.RUNGE, K. SACHS, T. SAEKI, E.K.G. SARKISYAN, A.D. SCHAILE, O. SCHAILE, P. SCHARFF-HANSEN, J. SCHIECK, T. SCHORNER-SADENIUS, M. SCHRODER, M. SCHUMACHER, R. SEUSTER, T.G. SHEARS, B.C. SHEN, P. SHERWOOD, A. SKUJA, A.M. SMITH, R. SOBIE, S. SOLDNER-REMBOLD, F. SPANO, A. STAHL, D. STROM, R. STROHMER, S.TAREM, M.TASEVSKY, R.TEUSCHER, M.A.THOMSON, E.TORRENCE, D.TOYA, P.TRAN, I.TRIGGER, Z.TROCSANYI, E.TSUR, M.F.TURNER-WATSON, I.UEDA, B.UJVARI, C.F.VOLLMER, P.VANNEREM, R.VERTESI, M.VERZOCCHI, H.VOSS, J.VOSSEBELD, C.P.WARD, D.R.WARD, P.M.WATKINS, A.T.WATSON, N.K.WATSON, P.S.WELLS, T.WENGLER, N.WERMES, G.W.WILSON1, J.A.WILSON, G.WOLF, T.R.WYATT, S.YAMASHITA, D. ZER-ZION, and L. ZIVKOVIC

Subjects
Particle physics, Photon, Physics and Astronomy (miscellaneous), Hadron, FOS: Physical sciences, Fizikai tudományok, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Természettudományok, 0103 physical sciences, Radiative transfer, 010306 general physics, Engineering (miscellaneous), QC, Quantum chromodynamics, Physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Photon radiation, Observable, Strong coupling, High Energy Physics::Experiment, Event (particle physics), Particle Physics - Experiment
Abstract

Hadronic final states with a hard isolated photon are studied using data taken at centre-of-mass energies around the mass of the Z0 boson with the OPAL detector at LEP. The strong coupling alpha S is extracted by comparing data and QCD predictions for event shape observables at average reduced centre-of-mass energies ranging from 24 GeV to 78 GeV, and the energy dependence of alpha S is studied. Our results are consistent with the running of alpha S as predicted by QCD and show that within the uncertainties of our analysis event shapes in hadronic Z0 decays with hard and isolated photon radiation can be described by QCD at reduced centre-of-mass energies. Combining all values from different event shape observables and energies gives alpha S (Mz)=0.1182 pm 0.0015(stat.) pm 0.0101(syst.)., Comment: No of pages 31 - No of figures 10

Published
2008

40. Measurement of the e+e- -> W+W- cross section and W decay branching fractions at LEP

Author

J. Grunhaus, A. Mutter, Sachio Komamiya, M. Gruwe, T. Saeki, P. Igo-Kemenes, M. Boutemeur, F. S. Merritt, K. Ishii, H. Jeremie, Tara Shears, J. A. McKenna, O. Schaile, Dave Charlton, T. Kuhl, Christoph Geich-Gimbel, M. Schumacher, J. Dubbert, R. K. Carnegie, E. Tsur, C. M. Hawkes, J. A. Wilson, Teresa Barillari, M. Hamann, E. A. De Wolf, A. D. Schaile, Isabel Marian Trigger, K. W. Bell, J. C. Hill, Pamela Ferrari, A. J. Martin, Richard Keeler, Gabriella Pasztor, P. Vannerem, Tobias Kramer, B. C. Shen, Siegfried Bethke, L. Zivkovic, R. J. Sobie, M. Ford, R. D. Heuer, Joost Vossebeld, C. P. Ward, B. Dienes, Klaus Desch, M. A. Thomson, S. Söldner-Rembold, P. Mättig, Gideon Alexander, Gideon Bella, J. W. Gary, Paolo Capiluppi, J. von Krogh, E. K. U. Gross, H. Voss, H. Mes, W. Mader, R. J. Hawkings, I. P. Duerdoth, Satoru Yamashita, H. J. Burckhart, Shoji Asai, Daniel Lellouch, P. J. Bell, P. S. Wells, Shlomo Dado, Ehud Duchovni, Matthias Schröder, M. Przybycień, A. T. Watson, J. Goldberg, Takehiko Mori, A. A. Carter, Achim Stahl, G. Mikenberg, D. J. Miller, J. M. Roney, Kiyotomo Kawagoe, A. Harel, Ikuo Ueda, D. M. Strom, J. Lu, A. Michelini, Koichi Nagai, M. Cuffiani, M. Verzocchi, P. F. Åkesson, Giovanni Abbiendi, W. Mohr, J. Lillich, B. W. Kennedy, R. J. Batley, H. Nanjo, D. Axen, T. Kobayashi, A. Ludwig, P. Jovanovic, Oana Elena Vickey Boeriu, Robert McPherson, Peter Krieger, T. Schörner-Sadenius, Raimund Ströhmer, D. R. Ward, Peter Sherwood, C. Pahl, George Lafferty, Christoph Rembser, G. Anagnostou, T. Behnke, James Pinfold, Satoshi Mihara, Paolo Giacomelli, Fabrizio Fabbri, A. Quadt, R. Seuster, A. Frey, T. R. Junk, Guenter Duckeck, J. Ludwig, K. Runge, E. Torrence, A. Gupta, A. Csilling, Gunter Wolf, Frank Fiedler, Gregor Herten, P. Bock, Klaus Rabbertz, S. Campana, Stephen Lloyd, D. Karlen, M. Dallavalle, H. Landsman, P. Scharff-Hansen, G. Giacomelli, P. Gagnon, Yoram Rozen, A. De Roeck, M. Kobel, J. E. Pilcher, P. M. Watkins, A. M. Smith, Frans Meijers, S. W. O'Neale, Andris Skuja, Junichi Kanzaki, G. W. Wilson, M. Hauschild, Tetsuro Mashimo, Zoltan Laszlo Trocsanyi, M. F. Turner-Watson, R. M. Brown, Lorne Levinson, Francesco Spanò, W. Menges, Otmar Biebel, N. Meyer, M. Kupper, E. L. Barberio, K. J. Anderson, Richard Teuscher, I. R. Bailey, Erez Etzion, Thorsten Wengler, Stefan Kluth, Shlomit Tarem, C. Y. Chang, D. E. Plane, M. Giunta, T. R. Wyatt, Gabriele Benelli, Norbert Wermes, T. Kawamoto, S. Orito, M. J. Oreglia, S. Braibant, A. Krasznahorkay, J. R. Carter, P. Renkel, Claudia Ciocca, K. Sachs, Philip Bechtle, Alain Bellerive, Marek Tasevsky, Dezso Horvath, N. K. Watson, Oliver Pooth, C. Ainsley, A. M. Rossi, Alexander Oh, R. G. Kellogg, Csaba Hajdu, Stefano Marcellini, I. Nakamura, D. Lanske, James Letts, R. Vértesi, Gordon H. Hanson, C. F. Vollmer, Jochen Schieck, R. J. Barlow, D. Zer-Zion, F. K. Loebinger, Ivor Fleck, Joleen Pater, Edward K. G. Sarkisyan, D. Toya, Balazs Ujvari, H. A. Neal, G.ABBIENDI, C.AINSLEY, P.F.AKESSON, G.ALEXANDER, G.ANAGNOSTOU, K.J.ANDERSON, S.ASAI, D.AXEN, I.BAILEY, E.BARBERIO, T.BARILLARI, R.J.BARLOW, R.J.BATLEY, P.BECHTLE, T.BEHNKE, K.W.BELL, P.J.BELL, G.BELLA, A.BELLERIVE, G.BENELLI, S.BETHKE, O.BIEBEL, O.BOERIU, P.BOCK, M.BOUTEMEUR, S.BRAIBANT, R.M.BROWN, H.J.BURCKHART, S.CAMPANA, P.CAPILUPPI, R.K.CARNEGIE, A.A.CARTER, J.R.CARTER, C.Y.CHANG, D.G.CHARLTON, C.CIOCCA, A.CSILLING, M.CUFFIANI, S.DADO, A.DE ROECK, E.A.DE WOLF, K.DESCH, B.DIENES, J.DUBBERT, E.DUCHOVNI, G.DUCKECK, I.P.DUERDOTH, E.ETZION, F.FABBRI, P.FERRARI, F.FIEDLER, I.FLECK, M.FORD, A.FREY, P.GAGNON, J.W.GARY, C.GEICH-GIMBEL, G.GIACOMELLI, P.GIACOMELLI, M.GIUNTA, J.GOLDBERG, E.GROSS, J.GRUNHAUS, M.GRUW, P.O.GUNTHER, A.GUPTA, C.HAJDU, M.HAMANN, G.G.HANSON, A.HAREL, M.HAUSCHILD, C.M.HAWKES, R.HAWKINGS, R.J.HEMINGWAY, G.HERTEN, R.D.HEUER, J.C.HILL, D.HORVATH, P. IGO-KEMENES, K. ISHII, H. JEREMIE, P. JOVANOVIC, T.R. JUNK, J.KANZAKI, D.KARLEN, K.KAWAGOE, T.KAWAMOTO, R.K.KEELER, R.G.KELLOGG, B.W.KENNEDY, S.KLUTH, T.KOBAYASHI, M.KOBEL, S.KOMAMIYA, T.KRAMER, A.KRASZNAHORKAY, P.KRIEGER, J. VON KROGH, T.KUHL, M.KUPPER, G.D. LAFFERTY, H. LANDSMAN, D. LANSKE, D. LELLOUCH, J. LETTSO, L. LEVINSON, J. LILLICH, S.L. LLOYD, F.K. LOEBINGER, J. LU27, A. LUDWIG, J. LUDWIG, W.MADER, S.MARCELLINI, A.J.MARTIN, T.MASHIMO, P.MATTIGM, J.MCKENNA, R.A.MCPHERSON, F.MEIJERS, W.MENGES, F.S.MERRITT, H.MES, N.MEYER, A.MICHELINI, S.MIHARA, G.MIKENBERG, D.J.MILLER, W.MOHR, T.MORI, A.MUTTER, K.NAGAI, I.NAKAMURA, H.NANJO, H.A.NEAL, R.NISIUS, S.W.O’NEALE, A.OH, M.J.OREGLIA, S.ORITO, C.PAHL, G.PASZTOR, J.R.PATER, J.E.PILCHER, J.PINFOLD, D.E.PLANE, O.POOTH, M.PRZYBYCIEN, A.QUADT, K.RABBERTZ, C.REMBSER, P.RENKEL, J.M.RONEY, A.M.ROSSI, Y.ROZEN, K.RUNGE, K. SACHS, T. SAEKI, E.K.G. SARKISYAN, A.D. SCHAILE, O. SCHAILE, P. SCHARFF-HANSEN, J. SCHIECK, T. SCHORNER-SADENIUS, M. SCHRODER, M. SCHUMACHER, R. SEUSTER, T.G. SHEARS, B.C. SHEN, P. SHERWOOD, A. SKUJA, A.M. SMITH, R. SOBIE, S. SOLDNER-REMBOLD, F. SPANO, A. STAHL, D. STROM, R. STROHMER, S.TAREM, M.TASEVSKY, R.TEUSCHER, M.A.THOMSON, E.TORRENCE, D.TOYA, P.TRAN, I.TRIGGER, Z.TROCSANYI, E.TSUR, M.F.TURNER-WATSON, I.UEDA, B.UJVARI, C.F.VOLLMER, P.VANNEREM, R.VERTESI, M.VERZOCCHI, H.VOSS, J.VOSSEBELD, C.P.WARD, D.R.WARD, P.M.WATKINS, A.T.WATSON, N.K.WATSON, P.S.WELLS, T.WENGLER, N.WERMES, G.W.WILSON1, J.A.WILSON, G.WOLF, T.R.WYATT, S.YAMASHITA, D. ZER-ZION, and L. ZIVKOVIC

Subjects
Physics, Particle physics, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Branching fraction, Cabibbo–Kobayashi–Maskawa matrix, Electron–positron annihilation, Hadron, Fizikai tudományok, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, Pair production, Természettudományok, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Nuclear Experiment, Engineering (miscellaneous), Particle Physics - Experiment, Charged current, Lepton, Event generator
Abstract

From a total data sample of 701.1 pb^-1 recorded with e+e- centre-of-mass energies of sqrt = 161-209 GeV with the OPAL detector at LEP, 11693 W-pair candidate events are selected. These data are used to obtain measurements of the W-pair production cross sections at 10 different centre-of-mass energies. The ratio of the measured cross sections to the Standard Model expectation is found to be: data/SM = 1.002 +- 0.011(stat.) +- 0.007(syst.) +- 0.005(theory), where the uncertainties are statistical, experimental systematics and theory systematics respectively. The data are used to determine the W boson branching fractions, which are found to be consistent with lepton universality of the charged current interaction. Assuming lepton universality, the branching ratio to hadrons is determined to be 67.41 +- 0.37(stat.) +- 0.23(syst.)%, from which the CKM matrix element Vcs is determined to be 0.96+-0.017(stat.)+-0.012(syst.). The differential cross section as a function of the W^- production angle is measured for the qqev and qqmv final states. The results described in this paper are consistent with the expectations from the Standard Model., Comment: 23 pages, 5 figures, Submitted to Eur Phys J.C

Published
2007

41. Bose-Einstein study of position-momentum correlations of charged pions in hadronic Z0 decays

Author

A. Mutter, Richard Teuscher, S. W. O'Neale, Erez Etzion, Oliver Pooth, Francesco Spanò, M. Hauschild, Stefan Kluth, Shlomit Tarem, Gideon Bella, H. J. Burckhart, K. J. Anderson, D. Axen, Oana Elena Vickey Boeriu, Matthias Schröder, B. C. Shen, T. R. Wyatt, E. Torrence, A. Gupta, W. Menges, Otmar Biebel, Peter Sherwood, R. G. Kellogg, P. Scharff-Hansen, Csaba Hajdu, D. E. Plane, G. M. Dallavalle, J. Ludwig, K. Runge, P. Bock, M. Giunta, Siegfried Bethke, Raimund Ströhmer, Stefano Marcellini, T. Behnke, Thorsten Wengler, James Letts, R. Vértesi, A. M. Smith, J. W. Gary, Lorne Levinson, I. R. Bailey, S. Campana, Gordon H. Hanson, J. Grunhaus, Christoph Geich-Gimbel, G. Anagnostou, Graham Wilson, J. Goldberg, M. Ford, P. M. Watkins, Norbert Wermes, P. Igo-Kemenes, Marek Tasevsky, Dezso Horvath, T. Kawamoto, N. K. Watson, T. Schörner-Sadenius, Teresa Barillari, M. Schumacher, Gabriele Benelli, J. von Krogh, K. Ishii, H. Jeremie, D. Zer-Zion, A. Csilling, P. J. Bell, F. K. Loebinger, Beatrix Dienes, Ivor Fleck, S. Orito, Sachio Komamiya, Andris Skuja, P. Renkel, M. Gruwe, Dave Charlton, Robert McPherson, R. J. Hawkings, E. A. De Wolf, Joleen Pater, Edward K. G. Sarkisyan, D. Toya, Pamela Ferrari, Balazs Ujvari, H. A. Neal, A. J. Martin, P. Gagnon, Kiyotomo Kawagoe, T. Saeki, Shlomo Dado, Fabrizio Fabbri, A. Frey, L. Zivkovic, M. Cuffiani, Tetsuro Mashimo, M. F. Turner-Watson, P. Mättig, H. Nanjo, A. Harel, Guenter Duckeck, C. Ainsley, T. R. Junk, C. F. Vollmer, C. Y. Chang, N. Meyer, Zoltan Laszlo Trocsanyi, J. Dubbert, Shoji Asai, R. K. Carnegie, O. Schaile, Gregor Herten, E. Tsur, C. M. Hawkes, J. A. Wilson, M. Boutemeur, F. S. Merritt, Isabel Marian Trigger, K. W. Bell, Christoph Rembser, Ikuo Ueda, D. M. Strom, H. Mes, I. P. Duerdoth, A. M. Rossi, M. J. Oreglia, Jochen Schieck, R. D. Heuer, S. Braibant, A. Krasznahorkay, W. Mader, M. Kupper, Daniel Lellouch, J. Lu, T. Kuhl, Gunter Wolf, J. C. Hill, Tobias Kramer, Takehiko Mori, R. J. Barlow, J. R. Carter, J. E. Pilcher, J. A. McKenna, G. Mikenberg, D. Karlen, C. Pahl, Tara Shears, M. Przybycień, A. A. Carter, R. J. Batley, James Pinfold, A. Quadt, R. Seuster, Alain Bellerive, G. Giacomelli, M. Verzocchi, R. M. Brown, P. F. Åkesson, Giovanni Abbiendi, M. Hamann, A. De Roeck, M. Kobel, Richard Keeler, Alexander Oh, Yoram Rozen, Frans Meijers, R. J. Sobie, I. Nakamura, D. Lanske, Joost Vossebeld, Junichi Kanzaki, A. D. Schaile, Gabriella Pasztor, Klaus Desch, P. Vannerem, C. P. Ward, Claudia Ciocca, S. Söldner-Rembold, K. Sachs, Philip Bechtle, P. S. Wells, A. T. Watson, M. A. Thomson, E. K. U. Gross, H. Voss, Satoru Yamashita, J. M. Roney, Koichi Nagai, W. Mohr, Paolo Giacomelli, J. Lillich, B. W. Kennedy, P. Jovanovic, Peter Krieger, Achim Stahl, D. J. Miller, H. Landsman, Klaus Rabbertz, Stephen Lloyd, Ehud Duchovni, A. Michelini, T. Kobayashi, A. Ludwig, D. R. Ward, George Lafferty, Satoshi Mihara, Gideon Alexander, E. L. Barberio, Paolo Capiluppi, Frank Fiedler, G.ABBIENDI, C.AINSLEY, P.F.AKESSON, G.ALEXANDER, G.ANAGNOSTOU, K.J.ANDERSON, S.ASAI, D.AXEN, I.BAILEY, E.BARBERIO, T.BARILLARI, R.J.BARLOW, R.J.BATLEY, P.BECHTLE, T.BEHNKE, K.W.BELL, P.J.BELL, G.BELLA, A.BELLERIVE, G.BENELLI, S.BETHKE, O.BIEBEL, O.BOERIU, P.BOCK, M.BOUTEMEUR, S.BRAIBANT, R.M.BROWN, H.J.BURCKHART, S.CAMPANA, P.CAPILUPPI, R.K.CARNEGIE, A.A.CARTER, J.R.CARTER, C.Y.CHANG, D.G.CHARLTON, C.CIOCCA, A.CSILLING, M.CUFFIANI, S.DADO, A.DE ROECK, E.A.DE WOLF, K.DESCH, B.DIENES, J.DUBBERT, E.DUCHOVNI, G.DUCKECK, I.P.DUERDOTH, E.ETZION, F.FABBRI, P.FERRARI, F.FIEDLER, I.FLECK, M.FORD, A.FREY, P.GAGNON, J.W.GARY, C.GEICH-GIMBEL, G.GIACOMELLI, P.GIACOMELLI, M.GIUNTA, J.GOLDBERG, E.GROSS, J.GRUNHAUS, M.GRUW, P.O.GUNTHER, A.GUPTA, C.HAJDU, M.HAMANN, G.G.HANSON, A.HAREL, M.HAUSCHILD, C.M.HAWKES, R.HAWKINGS, R.J.HEMINGWAY, G.HERTEN, R.D.HEUER, J.C.HILL, D.HORVATH, P. IGO-KEMENES, K. ISHII, H. JEREMIE, P. JOVANOVIC, T.R. JUNK, J.KANZAKI, D.KARLEN, K.KAWAGOE, T.KAWAMOTO, R.K.KEELER, R.G.KELLOGG, B.W.KENNEDY, S.KLUTH, T.KOBAYASHI, M.KOBEL, S.KOMAMIYA, T.KRAMER, A.KRASZNAHORKAY, P.KRIEGER, J. VON KROGH, T.KUHL, M.KUPPER, G.D. LAFFERTY, H. LANDSMAN, D. LANSKE, D. LELLOUCH, J. LETTSO, L. LEVINSON, J. LILLICH, S.L. LLOYD, F.K. LOEBINGER, J. LU27, A. LUDWIG, J. LUDWIG, W.MADER, S.MARCELLINI, A.J.MARTIN, T.MASHIMO, P.MATTIGM, J.MCKENNA, R.A.MCPHERSON, F.MEIJERS, W.MENGES, F.S.MERRITT, H.MES, N.MEYER, A.MICHELINI, S.MIHARA, G.MIKENBERG, D.J.MILLER, W.MOHR, T.MORI, A.MUTTER, K.NAGAI, I.NAKAMURA, H.NANJO, H.A.NEAL, R.NISIUS, S.W.O’NEALE, A.OH, M.J.OREGLIA, S.ORITO, C.PAHL, G.PASZTOR, J.R.PATER, J.E.PILCHER, J.PINFOLD, D.E.PLANE, O.POOTH, M.PRZYBYCIEN, A.QUADT, K.RABBERTZ, C.REMBSER, P.RENKEL, J.M.RONEY, A.M.ROSSI, Y.ROZEN, K.RUNGE, K. SACHS, T. SAEKI, E.K.G. SARKISYAN, A.D. SCHAILE, O. SCHAILE, P. SCHARFF-HANSEN, J. SCHIECK, T. SCHORNER-SADENIUS, M. SCHRODER, M. SCHUMACHER, R. SEUSTER, T.G. SHEARS, B.C. SHEN, P. SHERWOOD, A. SKUJA, A.M. SMITH, R. SOBIE, S. SOLDNER-REMBOLD, F. SPANO, A. STAHL, D. STROM, R. STROHMER, S.TAREM, M.TASEVSKY, R.TEUSCHER, M.A.THOMSON, E.TORRENCE, D.TOYA, P.TRAN, I.TRIGGER, Z.TROCSANYI, E.TSUR, M.F.TURNER-WATSON, I.UEDA, B.UJVARI, C.F.VOLLMER, P.VANNEREM, R.VERTESI, M.VERZOCCHI, H.VOSS, J.VOSSEBELD, C.P.WARD, D.R.WARD, P.M.WATKINS, A.T.WATSON, N.K.WATSON, P.S.WELLS, T.WENGLER, N.WERMES, G.W.WILSON1, J.A.WILSON, G.WOLF, T.R.WYATT, S.YAMASHITA, D. ZER-ZION, and L. ZIVKOVIC

Subjects
Particle physics, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Hadron, FOS: Physical sciences, Fizikai tudományok, 01 natural sciences, law.invention, High Energy Physics - Experiment, Nuclear physics, Momentum, High Energy Physics - Experiment (hep-ex), Pion, Természettudományok, Position (vector), law, 0103 physical sciences, Rapidity, ddc:530, 010306 general physics, Nuclear Experiment, Engineering (miscellaneous), Physics, 010308 nuclear & particles physics, 3. Good health, Transverse plane, Particle Physics - Experiment, Bose–Einstein condensate
Abstract

A study of Bose-Einstein correlations in pairs of identically charged pions produced in e+e- annihilations at the Z0 peak has been performed for the first time assuming a non-static emitting source. The results are based on the high statistics data obtained with the OPAL detector at LEP. The correlation functions have been analyzed in intervals of the average pair transverse momentum and of the pair rapidity, in order to study possible correlations between the pion production points and their momenta (position-momentum correlations). The Yano-Koonin and the Bertsch-Pratt parameterizations have been fitted to the measured correlation functions to estimate the geometrical parameters of the source as well as the velocity of the source elements with respect to the overall centre-of-mass frame. The source rapidity is found to scale approximately with the pair rapidity, and both the longitudinal and transverse source dimensions are found to decrease for increasing average pair transverse momenta., 25 pages, 10 figures, Submitted to Eur Phys J.C

Published
2007

43. Search for Invisibly Decaying Higgs Bosons with Large Decay Width Using the OPAL Detector at LEP

Author

E. Torrence, A. Gupta, R. M. Brown, Lorne Levinson, I. R. Bailey, D. E. Plane, P. Tran, Gideon Bella, H. J. Burckhart, Achim Stahl, S. Yamashita, Christoph Geich-Gimbel, M. Ford, James Pinfold, A. Quadt, R. Seuster, P. Gagnon, H. Mes, I. P. Duerdoth, Oliver Pooth, J. Goldberg, P. Igo-Kemenes, Shlomo Dado, J. Grunhaus, J. von Krogh, Ehud Duchovni, R. J. Hawkings, Alain Bellerive, Zoltan Laszlo Trocsanyi, P. J. Bell, K. Ishii, H. Jeremie, S. W. O'Neale, A. Michelini, C. F. Vollmer, G. Mikenberg, E. Tsur, Jochen Schieck, C. M. Hawkes, R. J. Barlow, Isabel Marian Trigger, K. W. Bell, C. Pahl, R. J. Batley, P. Scharff-Hansen, Kiyotomo Kawagoe, R. G. Kellogg, T. Kobayashi, S. Campana, A. Ludwig, J. Dubbert, M. A. Thomson, M. Boutemeur, F. S. Merritt, M. J. Oreglia, Francesco Spanò, R. K. Carnegie, J. C. Hill, S. Braibant, Robert McPherson, M. Cuffiani, Tobias Kramer, D. R. Ward, E. K. U. Gross, H. Voss, J. A. Wilson, Csaba Hajdu, K. J. Anderson, A. Mutter, A. M. Smith, B. C. Shen, M. Schumacher, Christoph Rembser, Fabrizio Fabbri, Stefano Marcellini, Raimund Ströhmer, A. Krasznahorkay, A. Frey, O. Schaile, H. Nanjo, Andris Skuja, James Letts, E. A. De Wolf, J. R. Carter, T. R. Junk, T. Kuhl, Siegfried Bethke, J. A. McKenna, D. Zer-Zion, W. Menges, Otmar Biebel, Gregor Herten, Tetsuro Mashimo, A. D. Schaile, G. Anagnostou, Claudia Ciocca, Sachio Komamiya, Erez Etzion, M. F. Turner-Watson, Gabriella Pasztor, L. Zivkovic, K. Sachs, F. K. Loebinger, P. Vannerem, J. M. Roney, P. M. Watkins, Philip Bechtle, Ivor Fleck, Stefan Kluth, J. E. Pilcher, Gideon Alexander, Paolo Capiluppi, N. Meyer, J. W. Gary, N. K. Watson, M. Gruwé, Koichi Nagai, Shlomit Tarem, M. Przybycień, M. Kupper, G. W. Wilson, M. Hauschild, Joleen Pater, Edward K. G. Sarkisyan, D. Toya, C. P. Ward, T. Behnke, W. Mohr, P. Renkel, T. Saeki, Richard Nisius, A. A. Carter, S. Söldner-Rembold, Richard Teuscher, Balazs Ujvari, H. A. Neal, Beatrix Dienes, C. Ainsley, D. Axen, Thorsten Wengler, Klaus Rabbertz, A. M. Rossi, M. Verzocchi, George Lafferty, Oana Elena Vickey Boeriu, M. Giunta, P. F. Åkesson, Giovanni Abbiendi, Stephen Lloyd, Marek Tasevsky, Dezso Horvath, Daniel Lellouch, Paolo Giacomelli, Takehiko Mori, R. Vértesi, Satoshi Mihara, C. Y. Chang, Alexander Oh, Peter Sherwood, Norbert Wermes, T. R. Wyatt, I. Nakamura, Gabriele Benelli, D. Lanske, Gordon H. Hanson, Yoram Rozen, Frank Fiedler, Gunter Wolf, J. Ludwig, T. Kawamoto, K. Runge, P. Bock, Junichi Kanzaki, D. Karlen, G. Giacomelli, Guenter Duckeck, S. Orito, P. S. Wells, Dave Charlton, Teresa Barillari, A. Csilling, R. D. Heuer, A. T. Watson, A. De Roeck, M. Kobel, A. Harel, Ikuo Ueda, D. M. Strom, Frans Meijers, J. Lu, P. Mättig, Shoji Asai, Pamela Ferrari, M. Hamann, Richard Keeler, J. Lillich, Matthias Schröder, B. W. Kennedy, R. J. Sobie, P. Jovanovic, Joost Vossebeld, Peter Krieger, Klaus Desch, T. Schörner-Sadenius, D. J. Miller, A. J. Martin, H. Landsman, W. Mader, Tara Shears, E. L. Barberio, OPAL Collaboration, G.ABBIENDI, C.AINSLEY, P.F.AKESSON, G.ALEXANDER, G.ANAGNOSTOU, K.J.ANDERSON, S.ASAI, D.AXEN, I.BAILEY, E.BARBERIO, T.BARILLARI, R.J.BARLOW, R.J.BATLEY, P.BECHTLE, T.BEHNKE, K.W.BELL, P.J.BELL, G.BELLA, A.BELLERIVE, G.BENELLI, S.BETHKE, O.BIEBEL, O.BOERIU, P.BOCK, M.BOUTEMEUR, S.BRAIBANT, R.M.BROWN, H.J.BURCKHART, S.CAMPANA, P.CAPILUPPI, R.K.CARNEGIE, A.A.CARTER, J.R.CARTER, C.Y.CHANG, D.G.CHARLTON, C.CIOCCA, A.CSILLING, M.CUFFIANI, S.DADO, A.DE ROECK, E.A.DE WOLF, K.DESCH, B.DIENES, J.DUBBERT, E.DUCHOVNI, G.DUCKECK, I.P.DUERDOTH, E.ETZION, F.FABBRI, P.FERRARI, F.FIEDLER, I.FLECK, M.FORD, A.FREY, P.GAGNON, J.W.GARY, C.GEICH-GIMBEL, G.GIACOMELLI, P.GIACOMELLI, M.GIUNTA, J.GOLDBERG, E.GROSS, J.GRUNHAUS, M.GRUW, P.O.GUNTHER, A.GUPTA, C.HAJDU, M.HAMANN, G.G.HANSON, A.HAREL, M.HAUSCHILD, C.M.HAWKES, R.HAWKINGS, R.J.HEMINGWAY, G.HERTEN, R.D.HEUER, J.C.HILL, D.HORVATH, P. IGO-KEMENES, K. ISHII, H. JEREMIE, P. JOVANOVIC, T.R. JUNK, J.KANZAKI, D.KARLEN, K.KAWAGOE, T.KAWAMOTO, R.K.KEELER, R.G.KELLOGG, B.W.KENNEDY, S.KLUTH, T.KOBAYASHI, M.KOBEL, S.KOMAMIYA, T.KRAMER, A.KRASZNAHORKAY, P.KRIEGER, J. VON KROGH, T.KUHL, M.KUPPER, G.D. LAFFERTY, H. LANDSMAN, D. LANSKE, D. LELLOUCH, J. LETTSO, L. LEVINSON, J. LILLICH, S.L. LLOYD, F.K. LOEBINGER, J. LU27, A. LUDWIG, J. LUDWIG, W.MADER, S.MARCELLINI, A.J.MARTIN, T.MASHIMO, P.MATTIGM, J.MCKENNA, R.A.MCPHERSON, F.MEIJERS, W.MENGES, F.S.MERRITT, H.MES, N.MEYER, A.MICHELINI, S.MIHARA, G.MIKENBERG, D.J.MILLER, W.MOHR, T.MORI, A.MUTTER, K.NAGAI, I.NAKAMURA, H.NANJO, H.A.NEAL, R.NISIUS, S.W.O’NEALE, A.OH, M.J.OREGLIA, S.ORITO, C.PAHL, G.PASZTOR, J.R.PATER, J.E.PILCHER, J.PINFOLD, D.E.PLANE, O.POOTH, M.PRZYBYCIEN, A.QUADT, K.RABBERTZ, C.REMBSER, P.RENKEL, J.M.RONEY, A.M.ROSSI, Y.ROZEN, K.RUNGE, K. SACHS, T. SAEKI, E.K.G. SARKISYAN, A.D. SCHAILE, O. SCHAILE, P. SCHARFF-HANSEN, J. SCHIECK, T. SCHORNER-SADENIUS, M. SCHRODER, M. SCHUMACHER, R. SEUSTER, T.G. SHEARS, B.C. SHEN, P. SHERWOOD, A. SKUJA, A.M. SMITH, R. SOBIE, S. SOLDNER-REMBOLD, F. SPANO, A. STAHL, D. STROM, R. STROHMER, S.TAREM, M.TASEVSKY, R.TEUSCHER, M.A.THOMSON, E.TORRENCE, D.TOYA, P.TRAN, I.TRIGGER, Z.TROCSANYI, E.TSUR, M.F.TURNER-WATSON, I.UEDA, B.UJVARI, C.F.VOLLMER, P.VANNEREM, R.VERTESI, M.VERZOCCHI, H.VOSS, J.VOSSEBELD, C.P.WARD, D.R.WARD, P.M.WATKINS, A.T.WATSON, N.K.WATSON, P.S.WELLS, T.WENGLER, N.WERMES, G.W.WILSON1, J.A.WILSON, G.WOLF, T.R.WYATT, S.YAMASHITA, D. ZER-ZION, and L. ZIVKOVIC

Subjects
Physics, Particle physics, Luminosity (scattering theory), Physics and Astronomy (miscellaneous), Branching fraction, Detector, Hadron, High Energy Physics::Phenomenology, FOS: Physical sciences, Fizikai tudományok, Standard Model, Gluon, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Természettudományok, Higgs boson, ddc:530, High Energy Physics::Experiment, Engineering (miscellaneous), Particle Physics - Experiment, Boson
Abstract

This paper describes a topological search for an invisibly decaying Higgs boson,H, produced via the Bjorken process (e+e- -> HZ). The analysis is based on data recorded using the OPAL detector at LEP at centre-of-mass energies from 183 to 209 GeV corresponding to a total integrated luminosity of 629pb-1. In the analysis only hadronic decays of the Z boson are considered. A scan over Higgs boson masses from 1 to 120 GeV and decay widths from 1 to 3000 GeV revealed no indication for a signal in the data. From a likelihood ratio of expected signal and Standard Model background we determine upper limits on cross-section times branching ratio to an invisible final state. For moderate Higgs boson decay widths, these range from about 0.07pb Mh = 60GeV) to 0.57pb (Mh = 114GeV). For decay widths above 200GeV the upper limits are of the order of 0.15pb. The results can be interpreted in general scenarios predicting a large invisible decay width of the Higgs boson. As an example we interpret the results in the so-called stealthy Higgs scenario. The limits from this analysis exclude a large part of the parameter range of this scenario experimentally accessible at LEP2., 30 pages, 10 figures, Submitted to Eur. Phys. J

Published
2006

44. First Measurement of Charged Current Cross Sections at HERA with Longitudinally Polarised Positrons

Author

C. Risler, Daniel Pitzl, D. Traynor, Wolfram Erdmann, B. List, L. Finke, A. Asmone, J. Zimmermann, S. Ghazaryan, Y.C. Zhu, C. Wissing, D. Lüke, Thorsten Lux, L. Janauschek, F. Cassol-Brunner, H. Peng, E. Wünsch, T. Kluge, Katerina Lipka, V. Tchoulakov, R.N. Shaw-West, Dave Sankey, A. Nikiforov, C. Gwilliam, A. Astvatsatourov, K. Daum, G. Knies, J. Feltesse, Ilias Panagoulias, Matthias Ulrich Mozer, A. Fedotov, L. Hajduk, T. Laštovička, E. Barrelet, Z. Rurikova, Max Klein, Zhen Zhang, E. A. De Wolf, Ch. Berger, L. Bystritskaya, S. Baumgartner, I. Foresti, G. Cozzika, G. D. Patel, Biljana Antunović, D.P. Johnson, Ricardo Lopez-Fernandez, C. Pascaud, Guenter Eckerlin, N. Malden, Pavel Murin, M. Ibbotson, M. Urban, S. Ginzburgskaya, C. Kiesling, A. De Roeck, E. Tzamariudaki, A. J. Campbell, Karlheinz Meier, R. Roosen, V. Lubimov, M. Goettlich, H. Zohrabyan, Laurent Favart, T. Anthonis, V. Chekelian, H. U. Martyn, Paul Laycock, M. Steder, C. Schmitz, M. Ismail, David Milstead, E. Malinovski, R. Marshall, Jan Kretzschmar, Andrej Liptaj, Laurent Schoeffel, Hannes Jung, G. Tsipolitis, J. V. Morris, Alexander Zhokin, Jenny List, C. Wigmore, Emmanuel Sauvan, G. Grindhammer, J. Becker, C. Vallée, D. Hoffmann, B. Reisert, D. Sunar, A.J. Rahmat, A. Bunyatyan, V. Jemanov, K. Urban, D. Meer, Murrough Landon, K. Nankov, L. N. Shtarkov, A. D.R. Vargas Trevino, A. Makankine, A. Usik, Leif J. Jönsson, Benoit Roland, G. Buschhorn, D. Ozerov, S. Gorbounov, A. M. Fomenko, Y. de Boer, I. Sheviakov, S. Hussain, V. Yeganov, D. Wegener, A. Dubak, T. Frisson, I. Strauch, G. Thompson, B. R. Grell, Søren Schmidt, D. Mladenov, P. A. Smirnov, C. Gerlich, R. Weber, Philipp Fleischmann, F. Moreau, S. J. Aplin, Paul Richard Newman, Grzegorz Nowak, A. Lebedev, F. Salvaire, D. Haidt, L. Lytkin, T. Klimkovich, R. Plačakytė, P. Van Mechelen, Y. Vazdik, P.D. Thompson, F. Tomasz, Judith Katzy, H. Henschel, J.C. Bizot, Cristinel Diaconu, Eram Rizvi, A. Petrukhin, J. Zálešák, V. Spaskov, Stefania Xella, G. Heinzelmann, V. Dodonov, V. Efremenko, Wolfgang Lange, Pierre Marage, A. Aktas, M. Jacquet, J. Kückens, K. Wacker, M. Kapichine, M. Nozicka, A. B. Meyer, E. Perez, G. Flucke, S. Levonian, S. Essenov, I. Glushkov, Stephen Maxfield, V. Lendermann, J. Gayler, S. Mikocki, C. Goyon, B. Delcourt, Th. Naumann, K. H. Hiller, R. C. W. Henderson, J. Stiewe, K. Krastev, M. Fleischer, S. Schätzel, I. Milcewicz-Mika, Ewelina Lobodzinska, Andrew Mehta, J. Bracinik, Anton Babaev, J. G. Contreras, Dusan Bruncko, N. Gogitidze, B. Naroska, L. Lindfeld, J. E. Olsson, G. Laštovička-Medin, A.-I. Lucaci-Timoce, Matthew Beckingham, P. E. Reimer, E. Gabathuler, V. Brisson, A. Mohamed, I. R. Kenyon, W. Bartel, P. Prideaux, Malte Hildebrandt, O. Behnke, Klaus Desch, Anna Kropivnitskaya, T. Greenshaw, Erika Garutti, A. Specka, David South, F. W. Büsser, Bogdan Povh, F. Sefkow, A. W. Jung, A. Rimmer, Theodora Papadopoulou, Peter Robmann, S. Baudrand, A. Schöning, M. Wessels, A. Knutsson, K. Krüger, Natasa Raicevic, T. Zimmermann, G. Herrera, Vincent Boudry, V. Michels, W.D. Dau, Bradley Cox, R. Wolf, B. Wessling, J. B. Dainton, J. Ferencei, M. Martisikova, A. N. Morozov, D. Perez-Astudillo, M. Gregori, S. Backovic, H. Lueders, Claus Kleinwort, Magnus Hansson, M. Del Degan, L. Goerlich, K. Müller, W. Yan, J. Cvach, N. Loktionova, A. Hovhannisyan, I. Tsurin, B. Portheault, C. Niebuhr, S. Egli, Y. Soloviev, E. E. Elsen, Christoph Grab, A. Baghdasaryan, A. Rostovtsev, D. Utkin, J. Bähr, B. Olivier, P. Baranov, T. J. Sloan, P.J.W. Faulkner, A.S. Belousov, Sergey Rusakov, P. Truöl, G. Weber, U. Straumann, V. Korbel, C. Werner, J. Wagner, Karel Cerny, A. Glazov, John A Coughlan, B. Stella, Stefan Schmitt, Vladimir Palichik, F. Eisele, R. Oganezov, K. Sedlák, V. Cerny, F. Zomer, V. Andreev, G. Franke, J. Žáček, Hans-Christian Schultz-Coulon, A. Falkewicz, Tomas Hreus, R. Eichler, M.-O. Boenig, S. Mangano, Nicolas Berger, A. Zhelezov, Adrian Perieanu, Gerhard Brandt, V. Volchinski, H. Meyer, Xavier Janssen, J-P. Meyer, Sakar Osman, C. Veelken, O. Behrendt, S. Vinokurova, P. Kostka, J. Turnau, I. Tsakov, Roland Horisberger, A. Valkárová, G. Leibenguth, 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, 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
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, FOS: Physical sciences, HERA, 01 natural sciences, Measure (mathematics), High Energy Physics - Experiment, Calorimeter, Standard Model, Nuclear physics, High Energy Physics - Experiment (hep-ex), Cross section (physics), Positron, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], ddc:530, High Energy Physics::Experiment, 010306 general physics, Charged current, Bar (unit)
Abstract

Data taken with positrons of different longitudinal polarisation states in collision with unpolarised protons at HERA are used to measure the total cross sections of the charged current process, e^+ p \to \bar��X, for negative four-momentum transfer squared Q^2 > 400 GeV^2 and inelasticity y, 13 pages, 2 figures, 1 table

Published
2006

45. Elastic J/Psi Production at HERA

Author

S. Levonian, I. Foresti, G. Cozzika, C. Schmitz, Hannes Jung, Alexander Zhokin, J. Becker, C. Vallée, M.-O. Boenig, P. E. Reimer, David South, A. Nikiforov, C. Goyon, P. D. Thompson, V. Yeganov, S. Mangano, K. Krüger, R. Marshall, F. Moreau, S. J. Aplin, A. Makankine, G. Buschhorn, D. Ozerov, R. Weber, B. Portheault, Nicolas Berger, Matthias Ulrich Mozer, A. Fedotov, G. Laštovička-Medin, Klaus Desch, A. Rimmer, A. Petrukhin, A. Knutsson, D. Wegener, Gero Flucke, M. Kapichine, M. Nozicka, A. Zhelezov, S. Ginzburgskaya, C. Kiesling, E. Tzamariudaki, A. J. Campbell, S. Essenov, Sakar Osman, Paul Laycock, E. Malinovski, Emmanuel Sauvan, A. M. Fomenko, V. Lubimov, S. Baudrand, Wolfgang Lange, Adrian Perieanu, B. Delcourt, K. H. Hiller, R. C. W. Henderson, C. Veelken, G. Grindhammer, V. P. Andreev, C. Gerlich, J. Gayler, F. Eisele, V. Jemanov, Magnus Hansson, M. Del Degan, D. Meer, D. Mladenov, Gerhard Brandt, Th. Naumann, C. Wigmore, R.N. Shaw-West, K. Nankov, C. Niebuhr, V. Efremenko, L. N. Shtarkov, Leif J. Jönsson, Benoit Roland, S. Schätzel, Søren Schmidt, R. Oganezov, K. Sedlák, A. Specka, V. Volchinski, S. Egli, Theodora Papadopoulou, Peter Robmann, A. D.R. Vargas Trevino, G. Nowak, T. Klimkovich, Roland Horisberger, J. Cvach, A. Valkárová, C. Risler, Xavier Janssen, E. Gabathuler, Y. Soloviev, S. Mikocki, V. Cerny, Ricardo Lopez-Fernandez, S. Hussain, S. Baumgartner, B. List, A. Aktas, Andreas Meyer, W. Yan, J. Zacek, Georgios Tsipolitis, M. Fleischer, Michael R. Wessels, Z. P. Zhang, F. P. Schilling, J. Zimmermann, J-P. Meyer, S. Backovic, A. Usik, V. Brisson, John A Coughlan, Laurent Schoeffel, H. Lueders, H. Henschel, J.C. Bizot, N. Loktionova, B. R. Grell, E. Lobodzinska, Stephen Maxfield, Bogdan Povh, F. Tomasz, F. Sefkow, A. Dubak, L. Bystritskaya, M. Goettlich, J. Stiewe, C. Gwilliam, B. Stella, Stefan Schmitt, A. Hovhannisyan, Christoph Grab, H. Zohrabyan, Y. Vazdik, D. Lüke, T. Kluge, Matthew Beckingham, Andrew Mehta, J. Bracinik, A. Astvatsatourov, M. Peez, Stefania Xella, N. Gogitidze, Katerina Lipka, Anna Kropivnitskaya, Dirk L. Hoffmann, R. Felst, G. Franke, K. Krastev, A. Vest, V. Tchoulakov, O. Behrendt, S. Vinokurova, V. Lendermann, L. Lindfeld, J. E. Olsson, T. Frisson, I. Strauch, T. Laštovička, W. Bartel, Philipp Fleischmann, E. Barrelet, Guenter Eckerlin, André Schöning, Malte Hildebrandt, Hans-Christian Schultz-Coulon, F. W. Büsser, L. Goerlich, P. Kostka, A.-I. Lucaci-Timoce, I. R. Kenyon, Z. Rurikova, A. Falkewicz, Natasa Raicevic, E. A. De Wolf, Ch. Berger, I. Tsurin, Vladimir Palichik, A. Baghdasaryan, Vincent Boudry, A. N. Morozov, D. Perez-Astudillo, M. Gregori, J. Turnau, Karlheinz Meier, R. Roosen, A. W. Jung, R. Eichler, A. Rostovtsev, Judith Katzy, Y. de Boer, M. Ellerbrock, A. Asmone, G. Herrera, Bradley Cox, J. Wagner, R. Wolf, B. Wessling, D. Utkin, J. Bähr, I. Tsakov, Karel Cerny, P. Baranov, Graham Thompson, A. Glazov, V. Korbel, T. J. Sloan, P.J.W. Faulkner, A.S. Belousov, Sergey Rusakov, H. U. Martyn, Matthias Klein, E. E. Elsen, K. Müller, Alexandre Lebedev, C. Werner, Paul Newman, T. Zimmermann, G. Leibenguth, G. Weber, U. Straumann, M. Jacquet, I. Milcewicz-Mika, Anton Babaev, J. G. Contreras, A. Mohamed, P. Prideaux, Pavel Murin, M. Ibbotson, B. Olivier, Laurent Favart, T. Anthonis, Murrough Landon, S. Gorbounov, W.D. Dau, J. B. Dainton, P. Van Mechelen, L. Finke, Y.C. Zhu, K. Daum, Ilias Panagoulias, G. Knies, Wolfram Erdmann, R. Plačakyte, S. Ghazaryan, M. Ismail, David Milstead, P. A. Smirnov, S. Caron, Daniel Pitzl, D. Traynor, J. V. Morris, F. Cassol-Brunner, D.K. Nikitin, O. Henshaw, L. Hajduk, Jenny List, M. Urban, C. Wissing, A.J. Rahmat, A. Bunyatyan, Thorsten Lux, L. Janauschek, Jan Kretzschmar, Andrej Liptaj, E. Wünsch, Dave Sankey, G. D. Patel, K. Wacker, H. Meyer, Biljana Antunović, D.P. Johnson, N. Malden, David Schmidt, C. Pascaud, F. Salvaire, D. Haidt, T. Hreus, L. Lytkin, A. De Roeck, Cristinel Diaconu, Eram Rizvi, Pierre Marage, G. Heinzelmann, V. Dodonov, I. Glushkov, O. Behnke, V. Chekelian, I. Sheviakov, Peter Truoel, J. Zálešák, V. Spaskov, J. Kückens, Dusan Bruncko, B. Naroska, E. Perez, T. Greenshaw, Erika Garutti, J. Ferencei, M. Martisikova, Claus Kleinwort, Fabian Zomer, 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), 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
Particle physics, Physics and Astronomy (miscellaneous), Meson, Proton, Nuclear Theory, FOS: Physical sciences, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Pomeron, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], ddc:530, 010306 general physics, Nuclear Experiment, Engineering (miscellaneous), Physics, Luminosity (scattering theory), 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Perturbative QCD, HERA, Helicity, Gluon, High Energy Physics::Experiment
Abstract

Cross sections for elastic production of J/Psi mesons in photoproduction and electroproduction are measured in electron proton collisions at HERA using an integrated luminosity of 55 pb^{-1}. Results are presented for photon virtualities Q^2 up to 80 GeV^2. The dependence on the photon-proton centre of mass energy W_{gamma p} is analysed in the range 40 < \Wgp < 305 GeV in photoproduction and 40 < \Wgp < 160 GeV in electroproduction. The \Wgp dependences of the cross sections do not change significantly with Q^2 and can be described by models based on perturbative QCD. Within such models, the data show a high sensitivity to the gluon density of the proton in the domain of low Bjorken x and low Q^2. Differential cross sections d��/dt, where t is the squared four-momentum transfer at the proton vertex, are measured in the range |t, 40 pages, 14 figures, 15 tables

Published
2006

46. Supersymmetry parameter analysis: SPA convention and project

Author

Myriam Mondragón, Keisho Hidaka, Michael Kramer, Jonathan Bagger, Daniel Tovey, Y. Yamada, Jin Min Yang, Yi Jiang, Klaus Desch, Richard L. Arnowitt, Hong-Jian He, W. Oller, Heidi Rzehak, Vernon Barger, K. Hohenwarter-Sodek, I. Hinchliffe, Juan Antonio Aguilar-Saavedra, T. Kamon, Fernando Quevedo, Heather E. Logan, Keith A. Olive, John F. Gunion, D. Zerwas, S.-H. Zhu, D. Nomura, Stephen F. King, Biswarup Mukhopadhyaya, T. Fritzsche, X. Zhang, N. Okada, Edouard Boos, Werner Porod, Frank F. Deppisch, Michael Spira, Georg Weiglein, Michael Barnett, Krzysztof Rolbiecki, John Ellis, Gudrid Moortgat-Pick, Wolfgang Kilian, W. G. Ma, U. Nauenberg, J. L. Kneur, Paraskevas Sphicas, Martin Hirsch, Marco Aurelio Diaz, Philip Bechtle, Sabine Kraml, D.R.T. Jones, Howard E. Haber, Michael E. Peskin, Sin Kyu Kang, Jens Erler, Giacomo Polesello, Ren-You Zhang, H. Fraas, Ahmed Ali, Howard Baer, Paul Langacker, Wolfgang Hollik, Sven Heinemeyer, Stefano Moretti, Jürgen Reuter, David J. Miller, Tobias Hurth, Gilbert Moultaka, Edmond L. Berger, K. Hagiwara, Ch. Weber, Michael Klasen, Geneviève Bélanger, Mihoko M. Nojiri, Liyuan Han, P. Schleper, Benjamin C. Allanach, Bhaskar Dutta, Konstantin Matchev, H. U. Martyn, Probir Roy, Csaba Balázs, Choong Sun Kim, Peter Wienemann, K. Kovarik, W. Majerotto, Naoyuki Haba, Tim M. P. Tait, Rohini M. Godbole, Kim Siyeon, A. Bartl, Thomas Kernreiter, Peter Skands, Abdelhak Djouadi, Helmut Eberl, G. Gounaris, A. De Roeck, J. Kalinowski, Z.-Z. Xing, Alexander Belyaev, M. M. Mühlleitner, Gordon L. Kane, Reinhold Rückl, Peter J. Richardson, Marco Battaglia, S.Y. Choi, S. Dutta, Tao Han, O. Kittel, Carlos E. M. Wagner, I. Jack, Remi Lafaye, Steve Muanza, P.M. Zerwas, S. Hesselbach, Marcela Carena, W. S. Hou, José W. F. Valle, Takehiko Mori, Dominik Stöckinger, H. Nowak, P. Slavich, Ayres Freitas, Tilman Plehn, David L. Rainwater, Jaume Guasch, G.A. Blair, 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 de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Théorique et Astroparticules (LPTA), Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Quantum Field Theory, Scheme (programming language), Particle physics, Cold dark matter, Experimental Physics, Physics and Astronomy (miscellaneous), FOS: Physical sciences, 01 natural sciences, law.invention, Set (abstract data type), High Energy Physics - Phenomenology (hep-ph), law, 0103 physical sciences, ddc:530, 010306 general physics, Collider, Engineering (miscellaneous), Particle Physics - Phenomenology, Nuclear Physics, computer.programming_language, Physics, Large Hadron Collider, 010308 nuclear & particles physics, Física, Observable, Supersymmetry, Physics beyond the Standard Model, High Energy Physics - Phenomenology, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Production (computer science), computer, Elementary Particles
Abstract

18 páginas, 6 figuras, 12 tablas.-- et al., High-precision analyses of supersymmetry parameters aim at reconstructing the fundamental supersymmetric theory and its breaking mechanism. A well defined theoretical framework is needed when higher-order corrections are included. We propose such a scheme, Supersymmetry Parameter Analysis SPA, based on a consistent set of conventions and input parameters. A repository for computer programs is provided which connect parameters in different schemes and relate the Lagrangian parameters to physical observables at LHC and high energy e + e - linear collider experiments, i.e., masses, mixings, decay widths and production cross sections for supersymmetric particles. In addition, programs for calculating high-precision low energy observables, the density of cold dark matter (CDM) in the universe as well as the cross sections for CDM search experiments are included. The SPA scheme still requires extended efforts on both the theoretical and experimental side before data can be evaluated in the future at the level of the desired precision. We take here an initial step of testing the SPA scheme by applying the techniques involved to a specific supersymmetry reference point.

Published
2006

47. Measurement of Event Shape Variables in Deep-Inelastic Scattering at HERA

Author

T. Laštovička, E. Barrelet, Z. Rurikova, Stephen Maxfield, E. A. De Wolf, Ch. Berger, Karlheinz Meier, R. Roosen, J. Stiewe, V. Jemanov, Y. de Boer, Andrew Mehta, J. Bracinik, N. Gogitidze, Søren Schmidt, Ilias Panagoulias, C. Risler, C. Wissing, B. List, Max Klein, G. Flucke, A. Aktas, A. W. Jung, I. Sheviakov, R. Plačakyte, C. Gwilliam, Peter Robmann, G. Herrera, Bradley Cox, R. Wolf, M. Ismail, David Milstead, V. Lubimov, V. Korbel, A. Petrukhin, P. A. Smirnov, A. Astvatsatourov, E. Gabathuler, J. Zálešák, V. Spaskov, B. Olivier, P. Baranov, V. Lendermann, Thorsten Lux, L. Janauschek, T. J. Sloan, P.J.W. Faulkner, A.S. Belousov, Sergey Rusakov, P. Truöl, J. Kückens, K. Wacker, A. B. Meyer, A. Nikiforov, C. Goyon, Anton Babaev, J. G. Contreras, A. Mohamed, M. Kapichine, M. Nozicka, B. R. Grell, B. Wessling, M.-O. Boenig, D. Sunar, A. Baghdasaryan, A. Rostovtsev, P. Prideaux, Magnus Hansson, A.-I. Lucaci-Timoce, Dusan Bruncko, S. Backovic, M. Del Degan, B. Naroska, Alexandre Lebedev, C. Werner, K. Nankov, Katerina Lipka, Paul Laycock, E. Malinovski, L. N. Shtarkov, Georgios Tsipolitis, M. Fleischer, F. Tomasz, Pavel Murin, V. Tchoulakov, H. Lueders, Michael R. Wessels, H. U. Martyn, Emmanuel Sauvan, G. Grindhammer, T. Greenshaw, V. Brisson, S. Schätzel, M. Ibbotson, Nicolas Berger, D. Utkin, G. Nowak, R.N. Shaw-West, S. Hussain, T. Hreus, L. Lytkin, A. Dubak, J. Bähr, A. D.R. Vargas Trevino, G. Thompson, C. Niebuhr, J. Ferencei, M. Martisikova, Cristinel Diaconu, Laurent Favart, T. Anthonis, Pierre Marage, R. Marshall, Leif J. Jönsson, V. Michels, W.D. Dau, Benoit Roland, D. Mladenov, J. V. Morris, A. Zhelezov, S. Baudrand, K. Müller, Y. Vazdik, Paul Newman, T. Zimmermann, J. B. Dainton, S. Egli, D. Lüke, Claus Kleinwort, Stefania Xella, M. Goettlich, Sakar Osman, H. Peng, K. Krastev, Y. Soloviev, J-P. Meyer, I. Glushkov, S. Levonian, Jenny List, A.J. Rahmat, A. Bunyatyan, T. Klimkovich, L. Lindfeld, J. Zimmermann, A. Makankine, E. Lobodzinska, Bogdan Povh, F. Sefkow, G. Weber, G. Leibenguth, Matthias Ulrich Mozer, A. Fedotov, S. Ginzburgskaya, H. Henschel, Fabian Zomer, I. Foresti, Dirk L. Hoffmann, J. C. Bizot, G. Franke, G. Cozzika, J. Cvach, Christoph Grab, C. Veelken, C. Kiesling, G. Buschhorn, F. Eisele, D. Ozerov, R. Weber, T. Kluge, Judith Katzy, A. De Roeck, E. Tzamariudaki, A. J. Campbell, E. Perez, T. Frisson, I. Strauch, Philipp Fleischmann, R. Oganezov, A. Asmone, C. Schmitz, U. Straumann, Thomas Naumann, Erika Garutti, K. Sedlák, Hannes Jung, Alexander Zhokin, Wolfgang Lange, K. H. Hiller, R. C. W. Henderson, Daniel Pitzl, J. Becker, J. Wagner, D. Wegener, C. Vallée, Zhen Zhang, Ricardo Lopez-Fernandez, D. Traynor, I. Milcewicz-Mika, David South, Laurent Schoeffel, V. Chekelian, V. Cerny, J. Gayler, F. Cassol-Brunner, K. Krüger, S. Baumgartner, L. Hajduk, Karel Cerny, Guenter Eckerlin, André Schöning, D. Meer, E. Wünsch, O. Behnke, M. Urban, L. Goerlich, Dave Sankey, M. Steder, Wolfram Erdmann, V. Efremenko, Jan Kretzschmar, J. Žáček, P. E. Reimer, B. Delcourt, Andrej Liptaj, S. Mikocki, A. Glazov, A. Usik, A. Specka, G. D. Patel, Adrian Perieanu, H. Meyer, Matthew Beckingham, Biljana Antunović, D.P. Johnson, S. Ghazaryan, G. Laštovička-Medin, O. Behrendt, S. Vinokurova, N. Malden, Anna Kropivnitskaya, R. Felst, Hans-Christian Schultz-Coulon, Klaus Desch, C. Pascaud, A. M. Fomenko, A. Rimmer, J. E. Olsson, F. Salvaire, W. Bartel, V. P. Andreev, D. Haidt, B. Portheault, C. Gerlich, A. Knutsson, Gerhard Brandt, Eram Rizvi, Theodora Papadopoulou, Malte Hildebrandt, C. Wigmore, K. Urban, G. Heinzelmann, Murrough Landon, V. Dodonov, P. Kostka, S. Gorbounov, P. D. Thompson, V. Volchinski, V. Yeganov, P. Van Mechelen, A. Falkewicz, L. Finke, F. W. Büsser, J. Turnau, Y.C. Zhu, K. Daum, S. Mangano, F. Moreau, R. Eichler, G. Knies, S. J. Aplin, I. Tsakov, Xavier Janssen, I. R. Kenyon, Roland Horisberger, A. Valkárová, Natasa Raicevic, J. Feltesse, Vincent Boudry, S. Essenov, A. N. Morozov, D. Perez-Astudillo, M. Gregori, L. Bystritskaya, H. Zohrabyan, W. Yan, N. Loktionova, A. Hovhannisyan, I. Tsurin, M. Jacquet, E. E. Elsen, B. Stella, Stefan Schmitt, Vladimir Palichik, John A Coughlan, 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), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Quantum chromodynamics, Physics, Particle physics, Luminosity (scattering theory), Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Generator (category theory), FOS: Physical sciences, Perturbative QCD, HERA, Jet (particle physics), Deep inelastic scattering, 01 natural sciences, 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], ddc:530, High Energy Physics::Experiment, 010306 general physics, Engineering (miscellaneous), Energy (signal processing)
Abstract

Deep-inelastic ep scattering data taken with the H1 detector at HERA and corresponding to an integrated luminosity of 106 pb-1 are used to study the differential distributions of event shape variables. These include thrust, jet broadening, jet mass and the C-parameter. The four-momentum transfer Q is taken to be the relevant energy scale and ranges between 14 GeV and 200 GeV. The event shape distributions are compared with perturbative QCD predictions, which include resummed contributions and analytical power law corrections, the latter accounting for non-perturbative hadronisation effects. The data clearly exhibit the running of the strong coupling αs(Q) and are consistent with a universal power correction parameter α0 for all event shape variables. A combined QCD fit using all event shape variables yields αs(mZ)=0.1198±0.0013 +0.0056 -0.0043 and α0=0.476±0.008 +0.018 -0.059., The European Physical Journal C, 46 (2), ISSN:1434-6044, ISSN:1434-6052

Published
2006

48. Electron-Positron Linear Collider

Author

Klaus Desch

Subjects
Physics, Particle physics, Gauge boson, Positron, law, Higgs boson, Electron, Collider, law.invention
Published
2005

49. A Determination of Electroweak Parameters at HERA

Author

M. Fleischer, J.E. Olsson, A. Usik, Paul Laycock, Emmanuel Sauvan, Murrough Landon, G. Grindhammer, C. Wissing, S. Gorbounov, N. Werner, F. W. Büsser, P.R. Newman, J. Ferencei, P.D. Thompson, G. Flucke, S. Backovic, Thorsten Lux, A. Glazov, R. Eichler, L. Janauschek, Y. Vazdik, V. Brisson, A. Baghdasaryan, K. Lipka, A. Morozov, G. Knies, B. List, A. Hovhannisyan, Vincent Boudry, B. Roland, L. Favart, Sakar Osman, Sebastian M. Schmidt, N. Gogitidze, A. Petrukhin, W. Bartel, L. Finke, J. Cvach, F. Salvaire, P. Smirnov, C. Niebuhr, C. Veelken, Max Klein, Y.C. Zhu, S. Caron, M. Gregori, A. Fomenko, J.G. Contreras, M. Ibbotson, T. Laštovička, B. Portheault, D. South, V. Yeganov, F. Tomasz, Eram Rizvi, T. Frisson, I. Strauch, P.J.W. Faulkner, M. Ismail, David Milstead, I. Glushkov, B. Olivier, S. Ghazaryan, B. Stella, G. Weber, E. Barrelet, L. Goerlich, X. Janssen, G. Heinzelmann, V. Tchoulakov, V. Dodonov, S. Baumgartner, U. Straumann, R. Oganezov, Alan Campbell, A. Kropivnitskaya, A. Vest, Zhen Zhang, Z. Rurikova, S. Vinokurova, V. Spaskov, A. Zhokin, Y.H. Fleming, K. Daum, V. Cerny, T. Papadopoulou, Ch. Berger, Karlheinz Meier, J. Zálešák, J. Gayler, S. Baudrand, J. Žáček, R. C. W. Henderson, R. Horisberger, M. Hildebrandt, C. Wigmore, Leif J. Jönsson, D. Nikitin, W. Lange, D. Mladenov, P. Baranov, R. Weber, Grazyna Nowak, V. Korbel, V. Efremenko, F. Cassol-Brunner, D. Utkin, C. Kleinwort, R.N. Shaw-West, C. Diaconu, Y. de Boer, Andreas Meyer, P. Van Mechelen, T. Klimkovich, K. Krastev, G. Herrera, Hans-Christian Schultz-Coulon, I. Sheviakov, T. Hreus, P. Kostka, M. Jacquet, K. Krüger, Dave Sankey, K. Müller, S. Hussain, Peter Robmann, M. Peez, V. Jemanov, G. Thompson, A. D. R. Vargas Trevino, V. Palichik, O. Behnke, B. R. Grell, G. Franke, B. Wessling, E. Wünsch, E. Gabathuler, G. D. Patel, B. Naroska, A. Astvatsatourov, Magnus Hansson, V. Lubimov, R. Plačakytė, A. Valkárová, H. Meyer, A. Lebedev, D. Hoffmann, A. Zhelezov, T. Kluge, G. Eckerlin, S. Mangano, A. Specka, I. Milcewicz-Mika, D. Haidt, T. Greenshaw, E. Lobodzinska, N. Malden, S. Schmitt, L. Hajduk, P. Murín, A. Mohamed, A. Schöning, N. Raicevic, H. Lueders, J. Bähr, R. Felst, C. Gerlich, D. Wegener, C. Grab, N. Keller, P. Prideaux, J. Katzy, R. Roosen, M. Martisikova, I. Tsakov, J.V. Morris, K. Nankov, A. Rostovtsev, D.P. Johnson, L. Lytkin, O. Behrendt, J.C. Bizot, N. Loktionova, V. Lendermann, M. Goettlich, C. Goyon, Stephen Maxfield, A. Makankine, P. Marage, D. Perez-Astudillo, K.H. Hiller, M.-O. Boenig, D. Traynor, A. Asmone, J. Stiewe, J. Turnau, L. Lindfeld, E. Garutti, A. Aktas, C. Werner, M. Kapichine, W.D. Dau, E. De Wolf, Andrew Mehta, J. Bracinik, A. Bunyatyan, J. B. Dainton, S. Levonian, P. Fleischmann, T. Zimmermann, I.R. Kenyon, F. Moreau, S. J. Aplin, M. Urban, F. Eisele, A. Fedotov, M. Nozicka, F. Sefkow, A. Dubak, A. Belousov, V. Volchinski, V. Chekelian, A.-I. Lucaci-Timoce, W. Yan, D. Bruncko, Jan Kretzschmar, J. Wagner, C. Risler, S. Egli, Andrej Liptaj, J. Zimmermann, D. Meer, A. W. Jung, M. Wessels, E. Perez, M. Ellerbrock, A. Falkewicz, Stefania Xella, Y. Soloviev, Karel Cerny, B. Delcourt, P. Reimer, Bradley Cox, I. Panagoulias, R. Wolf, J. A. Coughlan, Matthias Ulrich Mozer, D. Pitzl, I. Tsurin, S. Ginzburgskaya, F. Zomer, C. Kiesling, A. De Roeck, B. Vujicic, E. Tzamariudaki, S. Essenov, D. Lüke, L. Bystritskaya, E. Malinovski, S. Rusakov, V. Andreev, T. Anthonis, I. Foresti, G. Cozzika, Stefan Valkar, T. J. Sloan, C. Schmitz, Hannes Jung, P. Truöl, J. Becker, F.-P. Schilling, Bogdan Povh, J. Kückens, C. Pascaud, O. Henshaw, Th. Naumann, A. Nikiforov, R. Marshall, A. Babaev, W. Erdmann, G. Buschhorn, D. Ozerov, S. Mikocki, G. Lastovicka-Medin, S. Schätzel, M. Beckingham, H. U. Martyn, K. Wacker, Klaus Desch, R. Lopez-Fernandez, A. Rimmer, A. Knutsson, H. Henschel, K. Sedlák, H. Zohrabyan, C. Gwilliam, G. Leibenguth, J-P. Meyer, Adrian Perieanu, C. Vallée, Gerhard Brandt, G. Tsipolitis, D.P. Brown, L.N. Shtarkov, Nicolas Berger, Laurent Schoeffel, 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, H1 Collaboration, 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 Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Quantum chromodynamics, Physics, Particle physics, Nuclear and High Energy Physics, Neutral current, 010308 nuclear & particles physics, Electroweak interaction, High Energy Physics::Phenomenology, FOS: Physical sciences, Weinberg angle, HERA, Deep inelastic scattering, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Isospin, 0103 physical sciences, Physique des particules élémentaires, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], ddc:530, High Energy Physics::Experiment, 010306 general physics, Charged current
Abstract

Using the deep inelastic e+p and e-p charged and neutral current scattering cross sections previously published, a combined electroweak and QCD analysis is performed to determine electroweak parameters accounting for their correlation with parton distributions. The data used have been collected by the H1 experiment in 1994-2000 and correspond to an integrated luminosity of 117.2 pb-1. A measurement is obtained of the W propagator mass in charged current ep scattering. The weak mixing angle sin 2θW is determined in the on-mass-shell renormalisation scheme. A first measurement at HERA is made of the light quark weak couplings to the Z0 boson and a possible contribution of right-handed isospin components to the weak couplings is investigated. © 2005 Elsevier B.V. All rights reserved., 0, DESY-05-093 / hep-ex/0507080, SCOPUS: ar.j, H1 Collaboration., info:eu-repo/semantics/published

Published
2005

50. 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

Catalog

Books, media, physical & digital resources
See catalog results