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1. Measurement of B0−0 mixing at the CERN Spp̄S collider

Author: K. Morgan, L. Dobrzynski, O. C. Allkofer, W. von Schlippe, G. Jorat, I. Zacharov, R. Priem, Emilio Petrolo, H. Bohn, H. Teykal, R. Prosi, M. Markytan, Jonathan M. Gregory, C.H. Tan, A. Geiser, E. Pietarinen, Daniel Denegri, D. J. Holthuizen, H. Castilla-Valdez, J. Colas, C.-E. Wulz, J. D. Dowell, H. Faissner, A. Bezaguet, S. Tether, S. Centro, R. Schleichert, Anna Teresa Meneguzzo, R. Conte, M. Passaseo, J.P. Vialle, A. Norton, F. Cavanna, G. Piano Mortari, Stefano Veneziano, A. Ferrando, C. Bacci, M. Demoulin, Jean-Pierre Merlo, J. Dorenbosch, T. Mller, Alessandro Bettini, Felicitas Pauss, Filippo Ceradini, S. Otwinowski, D. Schinzel, G. Bauer, R. Apsimon, R. Munoz, Carmen Albajar, Michael Albrow, H. Wagner, G. Thompson, B. Gonzalez, G. Pancheri, J. Gronberg, C. Markou, A. Morsch, G. Sajot, I. F. Fensome, M. Nikitas, Y. Zolnierowski, T. A. Fuess, P. Casoli, Alain Givernaud, K. Ankoviak, David B. Cline, G. Busetto, D. Drijard, Ritva Kinnunen, L. Taylor, C. Rubbia, F. J. Diez Hedo, X. Wu, S. Bartha, M. P. J. Landon, A. Di Ciaccio, H. Dibon, M. Felcini, C. D. Buchanan, B. Aubert, A. Moulin, M. A. Marquina, D. H. Stork, L. Fortson, V. Vuillemin, Jorma Tuominiemi, R. Martinelli, V. O'Dell, A. van Dijk, Christopher Seez, Steve McMahon, Anton Taurok, K. Wacker, T. Moers, E. Torrente-Lujan, J. P. Revol, K. Eggert, B. Buschbeck, D. Samyn, J. Garvey, J. P. Mendiburu, M. Yvert, D. Brockhausen, Veikko Karimäki, M. Mohammadi, Hans Reithler, E. Eisenhandler, Teresa Rodrigo, M W. Van de Guchte, P. I. P. Kalmus, M. Schrder, E. F. Clayton, K. Bos, Pierluigi Zotto, C. Daum, Manfred Krammer, W. Jank, J. P. Porte, G. Maurin, Aleandro Nisati, Konstanty Sumorok, M. Pimiä, P. Biddulph, I. Josa-Mutuberria, P. Nedelec, Sergio Cittolin, John A Coughlan, E. Radermacher, H. Evans, G. Ciapetti, M. Vargas, F. Szoncso, M. Rauschkolb, A. Caner, Nicolas Ellis, Dave Robinson, A. Placci, J. Salicio, I. R. Kenyon, Paraskevas Sphicas, M. Botlo, Peter Lipa, Ludovico Pontecorvo, D. Dau, M. Della Negra, Tejinder Virdee, Francesco Lacava, R. Bonino, S. A. Robins, J. Vrana, A. Bhrer, L. Zanello, T. C. Meyer, James Rohlf, P. Cennini, T. P. Shah, D. Kryn, S. Levegrn, Claudia J. Stubenrauch, S. Lammel, A. Gonidec, D. Linglin, H. Tuchscherer, L. Naumann, and Y. Lemoigne
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Argus, Particle physics, Large Hadron Collider, law, High mass, Collider, computer, Mixing (physics), computer.programming_language, law.invention
Abstract: We report on a new measurement of B 0 − B 0 mixing at the CERN SppS collider. Mixing is measured in the non-isolated high mass dimoun sample using data from the 1988–1989 collider runs. The measured value of the mixing parameter, χ, is 0.145±0.035(stat.) ± 0.014(syst.). The average of this measurement and that from our 1984–1985 data is ξ= 0.14 ± 0.029 (stat.) ± 0.017 (syst.) assuming fully correlated errors. Using the measurement of ξd from ARGUS and CLEO , we obtain χ = 0.50 ± 0.20, which gives a limit of χs > 0.17 (0.12) at 90% (95%) CL. Including the measurements of χ from the ALEPH and L3 experiments gives χs = 0.53 ± 0.15, and a limit of χs > 0.27 (0.23) at 90% (95%) CL.
Published: 1991

2. Intermittency studies in p collisions at

Author: R. Martinelli, Marta Felcini, E. Pietarinen, Ritva Kinnunen, I. F. Fensome, M. Pimiä, D. J. Holthuizen, B. Mours, F. J. Diez Hedo, Filippo Ceradini, T. A. Fuess, M. I. Josa, T. P. Shah, V. Vuillemin, Aleandro Nisati, G. Busetto, C. D. Buchanan, C. Albajar, M. Krammer, S. A. Robins, C. Bacci, Ludwik Dobrzynski, A. Norton, A. Gonidec, K. Eggert, G. Pancheri, L. Naumann, A. Ferrando, G. Cox, R. Bonino, A. Diciaccio, L. Zanello, E. Radermacher, J. P. Porte, G. Jorat, D. Schinzel, J. P. Mendiburu, C. Markou, P. Zotto, F. Pauss, Jonathan M. Gregory, X. Wu, M. Schröder, J. Garvey, M. Rauschkolb, A. Moulin, Achim Geiser, S. Otwinowski, A. van Dijk, T. S. Virdee, K. Ankoviak, Stefano Veneziano, P. I. P. Kalmus, Murrough Landon, P. Casoli, David B. Cline, A. Bettini, Th Muller, M. A. Marquina, Y. Lemoigne, A. Placci, M. Nikitas, J. Vrana, Jorma Tuominiemi, B. Buschbeck, H. Faissner, P. Biddulph, B. Aubert, K. Wacker, H. Dibon, M. Della Negra, D. Kryn, J. Dorenbosch, K. Morgan, R. Munoz, G. Salvini, L. Fortson, Y. Zolnierowski, P. Sphicas, H. Castilla-Valdez, James Rohlf, Daniel Denegri, P. Cennini, S. Levegrün, J. Gronberg, H. Bohn, D. Linglin, E. Eisenhandler, A. Givernaud, Peter Lipa, A. Meneguzzo, M. Demoulin, J. Colas, G. Sajot, D. Drijard, Stephan Lammel, R. Conte, Francesco Lacava, B. Gonzales, A. Böhrer, Steve McMahon, W. von Schlippe, H. Tuchscherer, Ludovico Pontecorvo, J. M. Salicio, Anton Taurok, Andreas Morsch, I. Zacharov, S. Cittolin, S. Tether, A. Caner, T. Rodrigo, L. Taylor, C.-E. Wulz, T. Moers, W. Jank, O. C. Allkofer, F. Cavanna, D. Samyn, M. Passaseo, J.P. Vialle, Hans Reithler, C. Stubenrauch, Dave Robinson, G. Piano Mortari, A. Bezaguet, F. Szoncso, P. Nedelec, Emilio Petrolo, E. F. Clayton, R. J. Apsimon, C. Daum, R. Prosi, B. Andrieu, W. van de Guchte, T. Meyer, S. Bartha, M. Botlo, S. Centro, M. Markytan, M. G. Albrow, E. Torrente-Lujan, Veikko Karimäki, J. D. Dowell, D. Dau, John A Coughlan, Vivian O'Dell, K. Bos, G. Thompson, Jean-Pierre Merlo, Nicolas Ellis, G. Bauer, D. H. Stork, M. Vargas, J. P. Revol, M. Yvert, Christopher Seez, H. Evans, G. Ciapetti, D. Brockhausen, C. Rubbia, M. Mohammadi, Konstanty Sumorok, G. Maurin, and I. Kenyon
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Detector, Monte Carlo method, Charged particle, law.invention, Nuclear physics, Azimuth, law, Intermittency, Pseudorapidity, Rapidity, Multiplicity (chemistry), Nuclear Experiment
Abstract: A significant intermittency signal is observed in 630 GeV p p collisions measured in the UA1 central detector. It occurs with similar magnitude in different variables: pseudorapidity, rapidity and azimuthal angle. The signal increases with decreasing charged particle multiplicity in the event. Its strength in a sample of low p⊥ tracks and its multiplicity dependence are not reproduced by commonly used Monte Carlo models of high energy interactions.
Published: 1990

3. Experimental limit on the decay W±→π±γ at the cern proton-antiproton collider

Author: M. Vargas, J. Salicio, J. Dorenbosch, J. Gronberg, Carmen Albajar, Jean-Pierre Merlo, G. Bauer, R. Martinelli, C. Rubbia, D. H. Stork, D. Linglin, W. von Schlippe, E. Pietarinen, Daniel Denegri, C. Bacci, Tejinder Virdee, K. Bos, Anna Teresa Meneguzzo, T.I. Meyer, Ritva Kinnunen, A. Ferrando, H. Tuchscherer, A. Diciaccio, M. Yvert, Francesco Lacava, Sergio Cittolin, Alain Givernaud, P. Sphicas, D. Samyn, D. Schinzel, B. Mours, S. A. Robins, J. Vrana, Teresa Rodrigo, J. Colas, F. J. Diez Hedo, G. Busetto, X. Wu, R. J. Apsimon, P. I. P. Kalmus, Steve McMahon, B. Gonzales, Anton Taurok, Christopher Seez, A. Bezaguet, Michael Albrow, E. Torrente-Lujan, F. Szoncso, L. Zanello, T. Moers, S. Tether, J. P. Revol, M. Felcini, B. Andrieu, L. Dobrzynski, L. Naumann, F. Cavanna, C. Markou, K. Eggert, Alessandro Bettini, G. Thompson, Jorma Tuominiemi, V. O'Dell, A. Morsch, G.F. Cox, H. Castilla-Valdez, P. Biddulph, M. Passaseo, J.P. Vialle, G. Piano Mortari, H. Evans, D. Brockhausen, G. Ciapetti, P. Casoli, A. van Dijk, G. Jorat, Jonathan M. Gregory, M. Nikitas, D. Drijard, I. Zacharov, H. Dibon, Emilio Petrolo, S. Bartha, M. A. Marquina, Y. Lemoigne, H. Faissner, G. Sajot, I. F. Fensome, K. Ankoviak, P. Nedelec, Veikko Karimäki, P. Cennini, David B. Cline, G. Pancheri, J. P. Mendiburu, Aleandro Nisati, R. Munoz, R. Prosi, A. Böhrer, Pierluigi Zotto, A. Norton, E. Eisenhandler, M. P. J. Landon, Nicolas Ellis, M. Mohammadi, M. Markytan, L. Fortson, L. Taylor, C. Daum, A. Geiser, Peter Lipa, O. C. Allkofer, Matthias Schröder, Hans Reithler, H. Bohn, D. Kryn, Stefano Veneziano, A. Moulin, Y. Zolnierowski, Felicitas Pauss, Filippo Ceradini, M. Botlo, Claudia J. Stubenrauch, S. Lammel, C.-E. Wulz, T. A. Fuess, E. F. Clayton, R. Conte, G. Maurin, S. Otwinowski, A. Placci, W. van de Guchte, K. Wacker, B. Buschbeck, E. Radermacher, J. P. Porte, J. Garvey, James Rohlf, J. D. Dowell, Th. Müller, John A Coughlan, W. Jank, C. D. Buchanan, T. P. Shah, Manfred Krammer, Ludovico Pontecorvo, V. Vuillemin, Konstanty Sumorok, M. Pimiä, K. Morgan, D. Dau, M. Della Negra, Maria Isabel Josa, M. Rauschkolb, R. Bonino, B. Aubert, D. J. Holthuizen, S. Centro, M. Demoulin, S. Levegrün, I. R. Kenyon, A. Gonidec, Dave Robinson, and A. Caner
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), Large Hadron Collider, Proton, 010308 nuclear & particles physics, Detector, 01 natural sciences, law.invention, Nuclear physics, law, Antiproton, 0103 physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, Limit (mathematics), 010306 general physics, Collider
Abstract: We present a search for the decay W±→π±γ, using data taken at the CERN proton-antiproton Collider with the UA1 detector and corresponding to an integrated luminosity of 0.7 pb−1. We do not observe a signal for such a process: hence we obtain an upper limit on the π±γ decay width of 5.8×10−2Γ (W±→e±v) (95%CL).
Published: 1990

4. A study of the general characteristics of proton-antiproton collisions at √s=0.2 to 0.9 TeV

Author: H. G. Moser, G. Busetto, C. Bacci, A. Bezaguet, D. Linglin, H. Faissner, Christopher Seez, A. Astbury, E. Tscheslog, Daniel J. Smith, James Rohlf, G. Walzel, O. C. Allkofer, Teresa Rodrigo, Jean-Pierre Merlo, R. Bonino, A. Moulin, P. I. P. Kalmus, G. Maurin, J. Garvey, K. Bos, D. Samyn, S. Tether, C. Markou, C. Rubbia, W. van de Guchte, M. Pimiä, J. Dorenbosch, E. Eisenhandler, G. Bauer, P. Erhard, G. Sajot, M. Schröder, Sergio Cittolin, J.P. Vialle, I. F. Fensome, Paraskevas Sphicas, V. O'Dell, D. Schinzel, P. Biddulph, Stefano Veneziano, A. van Dijk, J. Sass, K. Eggert, R. J. Apsimon, X. Wu, I. Zacharov, F. Szoncso, W. von Schlippe, Alessandro Bettini, B. Buschbeck, J. P. Debrion, M. Botlo, A. Schwartz, G. Thompson, R. Leuchs, L. Naumann, Margret Fincke-Keeler, A. Caner, I. Siotis, L. Taylor, G.F. Cox, P. Casoli, W.J. Haynes, Tejinder Virdee, J. P. Revol, P. Cennini, M. Nikitas, A. Geiser, Steve McMahon, J. P. Mendiburu, Francesco Lacava, V. Vuillemin, Carmen Albajar, C. Zaccardelli, D. Joyce, Anton Taurok, H. Dibon, M. G. Albrow, S. Beingessner, W. G. Scott, John A Coughlan, T. Moers, M. Yvert, Veikko Karimäki, Murrough Landon, T. C. Bacon, E. Radermacher, G. Pancheri, Guido Ciapetti, N. Bains, Christian Ghiglino, I. ten Have, Hans Reithler, Jorma Tuominiemi, Anna Teresa Meneguzzo, Th. Müller, Dave Charlton, Claudia J. Stubenrauch, S. Lammel, A. Gonidec, D. Kryn, Aleandro Nisati, T. Redelberger, W. Jank, E. F. Clayton, Pierluigi Zotto, A. Ferrando, M. Jimack, G. Salvini, A. Böhrer, J. P. Porte, M. Preischl, E. Pietarinen, M. A. Marquina, Daniel Denegri, R. Prosi, A. Diciaccio, J. D. Dowell, T. Fuess, Ritva Kinnunen, B. Mours, M. Markytan, Felicitas Pauss, M. Ikeda, Filippo Ceradini, J. Vrana, T. P. Shah, J. Colas, I. Wingerter, J. Kroll, L. Zanello, W. Kienzle, A. Norton, F. Cavanna, G. Piano Mortari, K. Ankoviak, David B. Cline, L. Fortson, M. Degiorgi, H. Bohn, C.-E. Wulz, R. Conte, L. Dobrzynski, G. Jorat, Jonathan M. Gregory, Peter Lipa, M. Lindgren, Alain Givernaud, D. Dau, M. Della Negra, B. Andrieu, F. J. Diez Hedo, S. Geer, P. Nedelec, Akram Khan, P. Colas, Nicolas Ellis, T. C. Meyer, S. Levegrün, Y. Giraud-Héraud, A. Kernan, K. Morgan, E. Petrolo, Richard Keeler, K. Wacker, M. Mohammadi, Manfred Krammer, Konstanty Sumorok, D. J. Holthuizen, S. Centro, M. Demoulin, I. R. Kenyon, Dave Robinson, A. Placci, and B. Aubert
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Proton, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Detector, 7. Clean energy, 01 natural sciences, Charged particle, law.invention, Momentum, Nuclear physics, Transverse plane, law, Antiproton, 0103 physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Collider, Particle Physics - Experiment
Abstract: The general characteristics of inelastic proton-antiproton collisions at the CERN SPS Collider are studied with the UA1 detector using magnetic and calorimetric analysis. Results are presented on charged particle multiplicities and transverse and longitudinal momenta, and on total transverse energy distributions at centre of mass energies ranging from 0.2 to 0.9 TeV.
Published: 1990

5. Search for new heavy quarks in proton-antiproton collisions at $$\sqrt s = 0.63 TeV$$

Author: A. Caner, G. Maurin, S. Bartha, Nicolas Ellis, W. van de Guchte, M. Botlo, Peter Lipa, Aleandro Nisati, Christopher Seez, Anna Teresa Meneguzzo, Y. Zolnierowski, Felicitas Pauss, Filippo Ceradini, W. von Schlippe, T. A. Fuess, D. Denegri, V. Vuillemin, A. Ferrando, M. Yvert, T.I. Meyer, J. Dorenbosch, Alain Givernaud, P. Sphicas, L. Taylor, H. Tuchscherer, K. Eggert, D. Samyn, M. Rauschkolb, F. J. Diez Hedo, M. A. Marquina, D. Kryn, D. Brockhausen, Jorma Tuominiemi, G. Busetto, J. Garvey, J. D. Dowell, M. Lindgren, M. Jimack, E. Pietarinen, Carmen Albajar, I. R. Kenyon, Vivian O'Dell, J. Gronberg, C. Bacci, J. P. Vialle, A. Bezaguet, Ludovico Pontecorvo, B. Andrieu, Stefano Veneziano, J. Colas, M. Degiorgi, H. Bohn, G. Sajot, S. A. Robins, S. Tether, J. Salicio, L. Dobrzynski, P. Erhard, Marta Felcini, C. Daum, J. P. Merlo, David Robinson, D. Schinzel, M. Della Negra, John A Coughlan, Maria Isabel Josa, B. Aubert, P. Nedelec, H. Castilla-Valdez, Barbara Alvarez Gonzalez, A. van Dijk, R. Leuchs, L. Zanello, A. Moulin, A. Norton, T. P. Shah, E. Eisenhandler, C.-E. Wulz, E. Tscheslog, J. P. Revol, L. Naumann, A. Gonidec, Andreas Morsch, G. Ciapetti, M. Vargas, R. Conte, E. Rademacher, Claudia J. Stubenrauch, Hal Evans, C. D. Buchanan, Achim Geiser, R. Martinelli, S. Lammel, K. Morgan, F. Cavanna, P. Cennini, Manfred Krammer, Y. Lemoigne, Sergio Cittolin, Konstanty Sumorok, S. Otwinowski, G. Piano Mortari, Hans Reithler, M. P. J. Landon, D. J. Holthuizen, B. Buschbeck, E. F. Clayton, L. Fortson, Emilio Petrolo, Ritva Kinnunen, A. Placci, M. Pimiä, S. Beingessner, James Rohlf, S. Centro, J. Kroll, J. P. Porte, Th. Müller, M. Demoulin, P. I. P. Kalmus, W. Jank, M. Markytan, D. Cline, C. Rubbia, Tejinder Virdee, G. Bauer, Francesco Lacava, D. H. Stork, R. Munoz, F. Szoncso, E. Torrente-Lujan, P. Biddulph, G. Walzel, J. P. Mendiburu, J. Vrana, K. Ankoviak, Alessandro Bettini, G. Thompson, S. Levegrün, D. Linglin, G.F. Cox, P. Casoli, H. Dibon, Veikko Karimäki, K. Bos, G. Pancheri, D. Dau, A. Böhrer, I. F. Fensome, Pierluigi Zotto, H. Faissner, M. Mohammadi, M. Nikitas, D. Drijard, K. Wacker, R. J. Apsimon, T. Rodrigo, Michael Albrow, O. C. Allkofer, Matthias Schröder, Xin Wu, I. Zacharov, R. Bonino, M. Passaseo, R. Prosi, Steve McMahon, Anton Taurok, T. Moers, C. Markou, A. Diciaccio, G. Jorat, and Jonathan M. Gregory
Subjects: Physics, Quark, Particle physics, Large Hadron Collider, Muon, Physics and Astronomy (miscellaneous), Proton, High Energy Physics::Lattice, High Energy Physics::Phenomenology, law.invention, Standard Model, Nuclear physics, law, Antiproton, High Energy Physics::Experiment, Collider, Engineering (miscellaneous), Particle Physics - Experiment, Bar (unit)
Abstract: We report on a search for new heavy quarks decaying semileptonically into muons, using 4.7 pb−1 of data taken during the CERN$p\bar p$ collider runs in 1988 and 1989. The properties of isolated muons accompanied by jets are consistent with the predictions from the Standard Model but do not show a signal for a new heavy quark. Combining all the UA1 data (5.4 pb−1), lower mass limits are obtained at 60 GeV/c2 (95% CL) for thet-quark and 43 GeV/c2 (95% CL) for a fourth-generation charge-1/3 quark (b′-quark).
Published: 1990

6. First observation of the beauty baryon Λb in the decay channel Λb→J/ψΛ at the CERN proton-antiproton collider

Author: Veikko Karimäki, Emilio Petrolo, E. Pietarinen, Daniel Denegri, H. Teykal, Jean-Pierre Merlo, Felicitas Pauss, M. Rauschkolb, R. Prosi, Pierluigi Zotto, Filippo Ceradini, A. Diciaccio, C. Demoulin, T. A. Fuess, C. Rubbia, J. Dorenbosch, A. Caner, M. Markytan, A. Bezaguet, J M. Salicio, B. Gonzalez, L. Taylor, H. Faissner, J. Gronberg, S. Levegrün, D. H. Stork, X. Wu, D. J. Holthuizen, P. Cennini, S. Otwinowski, Tejinder Virdee, Stefano Veneziano, M. Yvert, R. Priem, W. von Schlippe, P. Nedelec, Francesco Lacava, H. Dibon, A. Moulin, C. Markou, R. Martinelli, G. Sajot, I. F. Fensome, H. Bohn, Sergio Cittolin, Peter Lipa, S. Tether, D. Schinzel, A. Ferrando, D. Schleichert, E. Torrente-Lujan, J. P. Revol, Carmen Albajar, Aleandro Nisati, M. Passaseo, S. Centro, Jorma Tuominiemi, Nicolas Ellis, Alessandro Bettini, F. Szoncso, M.I. Josa, K. Wacker, Christopher Seez, J.P. Vialle, D. Samyn, Ludovico Pontecorvo, C. Daum, G. Pancheri, M. Mohammadi, A. Böhrer, C.-E. Wulz, J. Colas, G. Thompson, A. Morsch, D. Kryn, V. O'Dell, K. Eggert, D. Dau, M. Della Negra, Manfred Krammer, O. C. Allkofer, H. Evans, G. Ciapetti, R. Conte, D. Brockhausen, A. van Dijk, Steve McMahon, P. Casoli, G. Busetto, Konstanty Sumorok, Anton Taurok, Alain Givernaud, E. Eisenhandler, J. Garvey, Paraskevas Sphicas, T. Moers, I. Zacharov, K. Morgan, M. Vargas, I. R. Kenyon, A. Norton, F. Cavanna, L. Naumann, M. Botlo, M. Nikitas, D. Drijard, F. J. Diez Hedo, G. Piano Mortari, G. Bauer, M. Felcini, Teresa Rodrigo, A. Geiser, P. I. P. Kalmus, G. Maurin, S. Bartha, W. van de Guchte, P. Biddulph, M. Pimiä, M. A. Marquina, C. Bacci, K. Bos, R. Bonino, Y. Lemoigne, Th. Müller, W. Jank, Matthias Schröder, K. Ankoviak, Ritva Kinnunen, A. Bushbeck, L. Dobrzynski, David B. Cline, D. Linglin, T. C. Meyer, M. P. J. Landon, John A Coughlan, H. Tuchscherer, L. Fortson, James Rohlf, E. Radermacher, G. Jorat, Claudia J. Stubenrauch, S. Lammel, A. Gonidec, Jonathan M. Gregory, C.H. Tan, R. Apsimon, R. Munoz, Michael Albrow, H. Wagner, Dave Robinson, A. Placci, J. Vrana, L. Zanello, B. Aubert, Hans Reithler, E. F. Clayton, J. P. Porte, Y. Zolnierowski, C. D. Buchanan, T. P. Shah, V. Vuillemin, H. Castilla-Valdez, J. D. Dowell, J. P. Mendiburu, and Anna Teresa Meneguzzo
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, Large Hadron Collider, Proton, 010308 nuclear & particles physics, Branching fraction, 01 natural sciences, law.invention, Baryon, Nuclear physics, law, Antiproton, 0103 physical sciences, 010306 general physics, Collider, Event (particle physics)
Abstract: We report on the first observation of the beauty baryon Λb in an exclusive decay channel at the CERN p p collider. Using 4.7 pb−1 of muon data collected in the 1988/89 collider runs we reconstruct 16±5 Λb's in the decay mode Λ b → J ψΛ above a background of 9±1 events, corresponding to a significance of about five standard deviations. We measure the Λb mass to be mΛb=5640±50±30 MeV/c2. Using the beauty cross-section measured by UA1 we deduce for the product of the production fraction and branching ratio f Λ b Br (Λ b → J ψΛ )=(1.8±1.0)×10 -10 . Our sample contains three-muon event in which the beauty particle opposite to the Λ b is tagged by the third muon. We also observe an indication of a signal in the decay channel B 0 → J ψ K 0∗ with a significance of three standard deviations.
Published: 1991

7. BEAUTY PRODUCTION AT THE CERN PP-BAR COLLIDER

Author: K. Morgan, Sergio Cittolin, S. Otwinowski, M. Nikitas, D. Drijard, P. Biddulph, S. Bartha, M. A. Marquina, F. Szoncso, Steve McMahon, P. Cennini, Anton Taurok, T. Moers, B. Gonzalez, Michael Albrow, Teresa Rodrigo, R. J. Apsimon, M. Felcini, H. Wagner, W. von Schlippe, P. I. P. Kalmus, J. Colas, J. M. Silicio, R. Priem, D. Kryn, C. Markou, E. Eisenhandler, A. Bezaguet, C. Dau, M. Rauschkolb, Murrough Landon, Anna Teresa Meneguzzo, J. Dorenbosch, K. Bos, H. Faissner, H. Dibon, H. Castilla-Valdez, R. Martinelli, A. Ferrando, A. Caner, J. Gronberg, L. Dobrzynski, Aleandro Nisati, D. Linglin, J. D. Dowell, R. Munoz, Tejinder Virdee, Jean-Pierre Merlo, Francesco Lacava, R. Bonino, A. Norton, G. Jorat, F. Cavanna, Jonathan M. Gregory, C.H. Tan, H. Tuchscherer, A. Böhrer, K. Ankoviak, David B. Cline, G. Piano Mortari, E. Torrente-Lujan, Carmen Albajar, C. Rubbia, X. Wu, G. Sajot, Emilio Petrolo, R. Schleichert, J. P. Revol, P. Nedelec, G. Pancheri, H. Teykal, D. Samyn, Felicitas Pauss, Filippo Ceradini, I. F. Fensome, L. Naumann, C. Daum, R. Prosi, T. A. Fuess, J. P. Mendiburu, Y. Zolnierowski, C. Bacci, T. Meyer, M. Markytan, D. H. Stork, I. R. Kenyon, L. Fortson, Paraskevas Sphicas, M. Botlo, S. A. Robins, G. Bauer, Y. Lemoigne, J. Vrana, Jorma Tuominiemi, Nicolas Ellis, K. Wacker, Claudia J. Stubenrauch, S. Lammel, A. Gonidec, C. D. Buchanan, Peter Lipa, M. Vargas, H. Bohn, Stefano Veneziano, M. Mohammadi, L. Zanello, T. P. Shah, V. Vuillemin, Manfred Krammer, Konstanty Sumorok, A. Moulin, J. Garvey, Pierluigi Zotto, Alain Givernaud, Ritva Kinnunen, Ludovico Pontecorvo, L. Taylor, E. Pietarinen, Daniel Denegri, C.-E. Wulz, B. Buschbeck, James Rohlf, Alessandro Bettini, G. Thompson, R. Conte, M. Della Negra, Hans Reithler, F. J. Diez Hedo, Maria Isabel Josa, Th. Müller, A. Diciaccio, A. Morsch, E. F. Clayton, W. Jank, P. Casoli, G. Busetto, M. Yvert, S. Levegrün, G. Maurin, W. van de Guchte, M. Pimiä, H. Evans, V. O'Dell, A. van Dijk, Dave Robinson, A. Placci, John A Coughlan, E. Radermacher, O. C. Allkofer, I. Zacharov, Christopher Seez, V. Karimäki, D. Schinzel, K. Eggert, D. Brockhausen, A. Geiser, S. Tether, M. Passaseo, J.P. Vialle, Matthias Schröder, G. Ciapetti, J. P. Porte, D. J. Holthuizen, B. Aubert, S. Centro, and M. Demoulin
Subjects: Quantum chromodynamics, Quark, Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Large Hadron Collider, Muon, 010308 nuclear & particles physics, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Hadron, 01 natural sciences, law.invention, Nuclear physics, law, 0103 physical sciences, High Energy Physics::Experiment, Rapidity, Nuclear Experiment, 010306 general physics, Collider
Abstract: We report measurements of b-quark and B-hadron production in pp collisions at √s=630 GeV. We use muon samples to extract beauty production cross-sections over a wide range of transverse momentum in the central rapidity range |y| < 1.5. We compare our results to an O(αs3) QCD prediction and find good agreement over the measured b-quark transverse momentum range 6 GeV/c to 54 GeV/c. Using the shape of the pT and y distribution predicted by QCD to extrapolate our data, we infer a total cross-section for b-quark production at √s=630 GeV of σ(pp→bb+X)=19.3±7(exp.)±9(th.μb.
Published: 1991

8. Measurement of the ratio R≡σWBr(W→μν)/σzBr(Z→μμ) and ΓWtot at the CERN proton-antiproton collider

Author: Christopher Seez, K. Eggert, D. Brockhausen, H. Faissner, Carmen Albajar, R. Priem, P. Nedelec, G. Pancheri, Anna Teresa Meneguzzo, E. Pietarinen, Daniel Denegri, Jean-Pierre Merlo, A. Ferrando, A. Diciaccio, Nicolas Ellis, C. D. Buchanan, T. P. Shah, V. Vuillemin, C. Rubbia, R. Schleichert, L. Taylor, D. Daum, Tejinder Virdee, X. Wu, M. Felcini, R. Apsimon, R. Munoz, Francesco Lacava, I. R. Kenyon, D. Linglin, Claudia J. Stubenrauch, Jorma Tuominiemi, D. H. Stork, A. Gonidec, Aleandro Nisati, A. Moulin, V. O'Dell, Hans Reithler, E. F. Clayton, Alain Givernaud, A. van Dijk, K. Bos, C. Bacci, L. Dobrzynski, Veikko Karimäki, J. P. Mendiburu, G. Maurin, F. J. Diez Hedo, J. P. Porte, H. Tuchscherer, W. van de Guchte, M. Pimiä, Steve McMahon, Anton Taurok, T. Moers, A. Caner, G. Busetto, S. Bartha, Y. Zolnierowski, Felicitas Pauss, M. Vargas, Filippo Ceradini, G. Bauer, R. Martinelli, Teresa Rodrigo, P. I. P. Kalmus, G. Jorat, M. A. Marquina, A. Bezaguet, T. A. Fuess, H. Castilla-Valdez, Jonathan M. Gregory, C.H. Tan, Stephan Lammel, Ritva Kinnunen, J. D. Dowell, W. von Schlippe, J. Dorenbosch, Dave Robinson, John A Coughlan, E. Radermacher, A. Placci, M. Yvert, Pierluigi Zotto, B. Gonzalez, J. Garvey, D. Samyn, B. Aubert, J. Gronberg, J. Salicio, L. Naumann, D. J. Holthuizen, H. Evans, G. Ciapetti, Michael Albrow, Sergio Cittolin, D. Schinzel, H. Wagner, Alessandro Bettini, E. Eisenhandler, S. Otwinowski, G. Thompson, Y. Lemoigne, C. Markou, S. Centro, F. Szoncso, A. Morsch, M. Demoulin, P. Casoli, Paraskevas Sphicas, M. Botlo, E. Torrente-Lujan, J. P. Revol, S. Tether, M. Passaseo, J.P. Vialle, O. C. Allkofer, I. Zacharov, R. Bonino, James Rohlf, A. Geiser, T. C. Meyer, Matthias Schröder, Peter Lipa, Ludovico Pontecorvo, D. Dau, M. Della Negra, Maria Isabel Josa, S. Levegrün, H. Dibon, A. Böhrer, J. Colas, A. Norton, F. Cavanna, M. Nikitas, D. Drijard, G. Piano Mortari, K. Morgan, Stefano Veneziano, Emilio Petrolo, H. Teykal, R. Prosi, H. Bohn, M. Markytan, M. Rauschkolb, C.-E. Wulz, K. Wacker, M. Mohammadi, Manfred Krammer, Konstanty Sumorok, R. Conte, K. Ankoviak, David B. Cline, M. P. J. Landon, P. Biddulph, L. Fortson, P. Cennini, B. Buschbeck, Th. Müller, W. Jank, S. A. Robins, J. Vrana, L. Zanello, G. Sajot, and I. F. Fensome
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Muon, Proton, 010308 nuclear & particles physics, Electron, 01 natural sciences, law.invention, Standard Model, Nuclear physics, law, Antiproton, 0103 physical sciences, 010306 general physics, Collider
Abstract: An analysis of W and Z boson production at UA1, using 4.66 pb −1 of data from the 1988 and 1989 CERN p p Collider runs at s =0.63 TeV , yields R ≡ σ W Br(W→ μ v)/ σ z Br( Z → μμ )=10.4 −1.5 +1.8 stat.±0.8(syst.) We find R =9.5 −1.0 +1.1 (stat.+syst.) when combining all available UA1 data, in both the electron and muon channel, taken in the period 1983–1989. In the framework of the standard model, the value of R is used to infer the total width of the W boson, Γ W tot =2.18 −0.24 +0.26 (exp.)±0.04(theory) GeV/ c 2 .
Published: 1991

9. Limits On T-quark Decay Into Charged Higgs From A Direct Search At the Cern Ppbar Collider

Author: A. Ferrando, G. Maurin, S. Mcmahon, L. Pontecorvo, John A Coughlan, C. Seez, M. Della Negra, R. Conte, Hans Reithler, Daniel Denegri, H. Faissner, P. Lipa, K. Bos, F. Pauss, J. P. Porte, T A. Fuess, K M. Ankoviak, M. Nikitas, A. Caner, M. Pimia, V. Vuillemin, M W. Van de Guchte, Carmen Albajar, D. Linglin, D. Samyn, G. Busetto, R. Prosi, J. Salicio, D. Schinzel, M. Yvert, L. Dobrzynski, S. Lammel, E. Radermacher, Barbara Alvarez Gonzalez, I. Josa-Mutuberria, E. Pietarinen, Tejinder Virdee, K. Eggert, Francesco Lacava, A. Meneguzzo, G. Bauer, R. Bonino, M. Vargas, Y. Zolnierowski, Filippo Ceradini, D. Dau, T. Mller, F. Szoncso, P. Nedelec, J P. Merlo, J. Rohlf, P I P. Kalmus, R. Martinelli, H. Tuchscherer, A. Givernaud, M. Landon, I F. Fensome, Anton Taurok, K. Morgan, M. Mohammadi, S. Centro, P. Sphicas, G. Sajot, G. Pancheri, T. Moers, L. Naumann, I. Zacharov, W. Jank, H. Castilla-Valdez, G. Thompson, D. Cline, Ritva Kinnunen, D. Brockhausen, M. Demoulin, J D. Dowell, E. Eisenhandler, P. Biddulph, T. Meyer, C. Rubbia, C. D. Buchanan, A. Norton, H. Dibon, M. Schrder, T.P. Shah, Michael Albrow, M. Krammer, D J. Holthuizen, S. Levegrn, C E. Wulz, Claudia J. Stubenrauch, J. Dorenbosch, J P. Revol, H. Bohn, S. Cittolin, Marta Felcini, B. Buschbeck, J.P. Vialle, H F. Teykal, A. Di Ciaccio, F. Cavanna, J. Gronberg, M. Botlo, P. Cennini, R. Schleichert, I R. Kenyon, W. Von Schlippe, P. Casoli, A.A. van Dijk, Dave Robinson, A. Bhrer, G. Piano Mortari, S A. Robins, J. P. Mendiburu, Emilio Petrolo, V R. O'Dell, E. Torrente-Lujan, A. Placci, Pierluigi Zotto, B. Aubert, M. Markytan, Stefano Veneziano, C. Daum, Xin Wu, E. Clayton, K. Wacker, Y. Lemoigne, S. Bartha, R. Munoz, S. Tether, J. Colas, A. Bettini, R. Priem, G. Ciapetti, A. Bezaguet, A. Nisati, Nicolas Ellis, D. Kryn, A. Morsch, F. J. Diez Hedo, V. Karimaki, R J. Apsimon, M A. Marquina, K. Sumorok, T. Rodrigo, O. C. Allkofer, L. Fortson, A. Gonidec, M. Rauschkolb, D. Drijard, C. Bacci, D H. Stork, J. Garvey, L. Taylor, M. Passaseo, J. Tuominiemi, A. Geiser, C. Markou, G. Jorat, Jonathan M. Gregory, C.H. Tan, A. Moulin, S. Otwinowski, H. Wagner, J. Vrana, L. Zanello, and H. G. Evans
Subjects: Physics, Nuclear and High Energy Physics, Top quark, Particle physics, Large Hadron Collider, 010308 nuclear & particles physics, High Energy Physics::Lattice, High Energy Physics::Phenomenology, 01 natural sciences, UA1 experiment, Higgs sector, law.invention, Nuclear physics, law, 0103 physical sciences, Higgs boson, High Energy Physics::Experiment, Direct search, 010306 general physics, Collider, Boson
Abstract: A search for t-quark decay into charged Higgs, t→H + b, with the charged Higgs decaying via the H + → τ + v τ mode, has been done in proton-antiproton collisions at √2 = 0.63 TeV with the UA1 experiment. No evidence for this decay das been observed. Mass limits at 95% and 90% CL for the t-quark and the charged Higgs are presented. The results have also been interpreted in terms of the tan β parameter of a two-doublet Higgs sector.
Published: 1991

10. A SEARCH FOR RARE B-MESON DECAYS AT THE CERN SPPBARS COLLIDER

Author: J. Dorenbosch, W. von Schlippe, S. Bartha, M. A. Marquina, J. Garvey, J. Gronberg, M. Vargas, Michael Albrow, E. Eisenhandler, Tejinder Virdee, M. Felcini, Francesco Lacava, H. Wagner, H. Bohn, B. Aubert, O. C. Allkofer, I. Zacharov, D. Schinzel, M. Rauschkolb, G. Sajot, Alain Givernaud, A. Geiser, C.-E. Wulz, I. F. Fensome, R. Conte, F. J. Diez Hedo, C. Markou, James Rohlf, H. Faissner, D. Samyn, C. Daum, Steve McMahon, Anton Taurok, T. Moers, Carmen Albajar, Paraskevas Sphicas, M. Botlo, G. Pancheri, J. P. Mendiburu, E. Torrente-Lujan, J. P. Revol, D. Linglin, Murrough Landon, Anna Teresa Meneguzzo, Teresa Rodrigo, Christopher Seez, K. Ankoviak, H. Tuchscherer, David B. Cline, P. I. P. Kalmus, M. Schrder, S. Otwinowski, Aleandro Nisati, L. Fortson, K. Bos, K. Eggert, D. Brockhausen, A. Caner, S. Tether, Felicitas Pauss, Filippo Ceradini, M. Passaseo, J.P. Vialle, T. A. Fuess, Hans Reithler, E. F. Clayton, P. Nedelec, X. Wu, K. Wacker, M. Mohammadi, G. Maurin, J. P. Porte, Jorma Tuominiemi, Sergio Cittolin, M. Nikitas, D. Drijard, Manfred Krammer, M. Pimiä, Konstanty Sumorok, L. Naumann, K. Morgan, Y. Zolnierowski, E. Pietarinen, Daniel Denegri, Nicolas Ellis, C. D. Buchanan, T. P. Shah, I. R. Kenyon, V. Vuillemin, F. Szoncso, L. Dobrzynski, Y. Lemoigne, G. Jorat, Jonathan M. Gregory, C.H. Tan, John A Coughlan, R. Priem, E. Radermacher, H. Castilla-Valdez, J. D. Dowell, A. Bezaguet, J. Colas, R. Schleichert, H. Dibon, M. Yvert, R. Martinelli, A. Moulin, V. O'Dell, M W. Van de Guchte, Dave Robinson, A. Ferrando, A. Placci, J M. Salicio, A. van Dijk, I. Josa-Mutuberria, H. Evans, G. Ciapetti, Jean-Pierre Merlo, C. Bacci, C. Rubbia, D. H. Stork, A. Norton, F. Cavanna, T. Mller, B. Buschbeck, G. Piano Mortari, W. Jank, L. Taylor, G. Busetto, P. Cennini, G. Bauer, S. A. Robins, Ritva Kinnunen, B. Gonzalez, D. Kryn, J. Vrana, R. J. Apsimon, A. Bhrer, L. Zanello, P. Biddulph, Emilio Petrolo, Alessandro Bettini, S. Levegrn, Claudia J. Stubenrauch, S. Lammel, G. Thompson, H. Teykal, A. Gonidec, A. Morsch, P. Casoli, R. Prosi, M. Markytan, Veikko Karimäki, Pierluigi Zotto, A. Di Ciaccio, R. Munoz, R. Bonino, T. C. Meyer, D. J. Holthuizen, S. Centro, M. Demoulin, Peter Lipa, Ludovico Pontecorvo, D. Dau, M. Della Negra, and Stefano Veneziano
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, 010308 nuclear & particles physics, law, 0103 physical sciences, B meson, 010306 general physics, Collider, 01 natural sciences, law.invention
Abstract: We report on a search for the decays B 0 → μ + μ − , B → μ + μ − X and B d 0 → μ + μ − K 0∗ , which are expected to be rare if mediated by flavor changing neutral currents. Using data collected during the 1984–1989 CERN pp Collider runs, the UA1 search was carried out using μ+ μ− events with 3.9 B 0 d →μ + μ − K 0∗ of of 2.3 × 10−5. Implicatitions for upper limits on the t-quark mass are discussed.
Published: 1991

11. J/ψ and ψ′ production at the CERN p̄p collider

Author: J D. Dowell, G. Maurin, W. van de Guchte, M. Pimiä, Aleandro Nisati, Jean-Pierre Merlo, P. Prosi, James Rohlf, G. Bauer, Felicitas Pauss, Filippo Ceradini, J. Dorenbosch, T. A. Fuess, D. Samyn, J. Gronberg, H. Dibon, D. Schinzel, Paraskevas Sphicas, M. Rauschkolb, M. Botlo, H. Bohn, Christopher Seez, John A Coughlan, J. Colas, Steve McMahon, R. Martinelli, W. von Schlippe, Veikko Karimäki, E. Radermacher, Anton Taurok, K. Eggert, L. Taylor, Tejinder Virdee, Francesco Lacava, D. Brockhausen, C. Rubbia, Ritva Kinnunen, T. Moers, K. Bos, P. Nedelec, Murrough Landon, A. Caner, Anna Teresa Meneguzzo, Teresa Rodrigo, H. Castilla-Valdez, A. Böhrer, P. I. P. Kalmus, I.F. Fensome, D. J. Holthuizen, D. H. Stork, A. Norton, F. Cavanna, P. Cennini, A. Bezaguet, Pierluigi Zotto, Claudia J. Stubenrauch, S. Lammel, A. Gonidec, C. Markou, O. C. Allkofer, K. Morgan, G. Sajot, A. Ferrando, Alain Givernaud, J. Salicio, S. Levegrün, G. Piano Mortari, R. Schleichert, S. Centro, I. Zacharov, F. J. Diez Hedo, J.M. Gregory, E. Eisenhandler, Emilio Petrolo, Alessandro Bettini, G. Thompson, Sergio Cittolin, B. Aubert, H. Teykal, M. Demoulin, M. Vargas, C.-E. Wulz, V. O'Dell, A. van Dijk, A. Morsch, C. Bacci, P. Casoli, G. Busetto, L. Dobrzynzki, D. Daum, R. Bonino, F. Szoncso, J. Vrana, A. Gonzales, R. Conte, S. Bartha, D. Kryn, M. A. Marquina, M. Markytan, T. C. Meyer, S. Otwinowski, G. Jorat, C.H. Tan, Hans Reithler, E. F. Clayton, Stefano Veneziano, D. Drijard, J. Garvey, M. Yvert, I. Kenyon, Peter Lipa, A. Geiser, E. Torrente-Lujan, J. P. Revol, Ludovico Pontecorvo, D. Dau, M. Della Negra, Maria Isabel Josa, J. P. Porte, P. Biddulph, H. Evans, G. Ciapetti, Y. Zolnierowski, L. Forston, K. Wacker, S. Tether, M. Mohammadi, Manfred Krammer, C. D. Buchanan, T. P. Shah, Konstanty Sumorok, K. Ankoviak, David B. Cline, M. Passaseo, V. Vuillemin, J.P. Vialle, N. Ellis, Matthias Schröder, X. Wu, M. Nikitas, J.-P. Mendiburu, Jorma Tuominiemi, Dave Robinson, A. Placci, E. Pietarinen, Daniel Denegri, A. Diciaccio, R. Priem, Michael Albrow, H. Wagner, H. Faissner, L. Naumann, Y. Lemoigne, D. Linglin, H. Tuchscherer, S. A. Robins, L. Zanello, R. Apsimon, R. Munoz, A. Moulin, B. Buschbeck, Th. Müller, W. Jank, M. Felcini, Carmen Albajar, and G. Pancheri
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Luminosity (scattering theory), 010308 nuclear & particles physics, Branching fraction, Hadron, 01 natural sciences, law.invention, Nuclear physics, Direct production, law, 0103 physical sciences, Radiative transfer, Production (computer science), 010306 general physics, Collider
Abstract: We have measured the production cross-section times branching ratio for J/ψ→μ+μ− in pp interactions at √s = 630 GeV in the kinematic range |y| and p T >5 GeV /c, BR ( J /ψ→μ + μ − )σ( p p → J /ψ)=6.18±0.24±0.81 nb . The data sample collected in 1988 and 1989 for an integrated luminosity of 4.7 pb−1 represents a fivefold improvement over the statistics in our earlier study of the J/ψ production process, and the pT distribution which is measured extends to 28 GeV/c. Using event topology we show that the rate for the direct production of J/ψ, via radiative decays of χ states, is larger than that for production via B-hadrons. Production of ψ′ is also studied using the decay modes
Published: 1991

12. Performance of a uranium/tetramethylpentane electromagnetic and hadronic calorimeter

Author: J. Apsimon, R., Bacci, C., Bauer, G., Bézaguet, A., Bloess, D., M. Bodenes, J., Bonino, R., D. Buchanan, C., Busetto, G., Caner, A., Casoli, L., Castilla-Valdez, H., Cavanna, F., Cennini, P., Centro, S., Ceradini, F., Conte, R., Dellanegra, M., Di Ciaccio, Anna, M. De, Giorgi, F. J. Diez, Hedo, Drijard, Daniel, Dumps, L., Evans, H., Ferrando, A., Fuess, T.A., Givernaud, Alain, Gonidec, A., B. Gronberg, J., Josa-Mutuberria, I., Kienzle, W., Krammer, Manfred, Lacava, F., Lindgren, M., Marchand, D., Martinelli, R., Maurin, Guy, T. Meneguzzo, A., Mohammadi, M., Morgan, K., C. Muñoz, R., Naumann, L., Nédélec, P., Otwinowski, Stanislas, Petrolo, E., G. Piano, Mortari, Placci, Alfredo, Pontecorvo, L., Radermacher, Ernst, Pierre Charles Revol, Jean, Robinson, D., Rodrigo, T., Rubbia, Carlo, Schinzel, D., F. Schmidt, W., Seez, C., Seidl, W., H. Stork, D., J. Stubenrauch, Claudia, Sumorok, K., H. Tan, Q., Tether, S., F. Teykal, H., Torrente-Lujan, E., Ullaland, O., Guchte M. W. Van, De, Veneziano, Stefano, S. Virdee, Tejinder, Vuillemin, V., Walzel, G., Wingerter-Seez, I., Wu, X., L. Zotto, P., 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), and UA1
Subjects: Physics::Instrumentation and Detectors, High Energy Physics::Experiment, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Detectors and Experimental Techniques, Nuclear Experiment
Abstract: We present results from the barrel depleted uranium/TMP calorimeter modules constructed by the UA1 Collaboration. Electromagnetic and hadronic energy resolutions have been measured using electron and pion beams with momenta in the range 7 to 70 GeV/c. Results on the energy linearity and the spatial uniformity of response are reported. The electromagnetic shower position resolution has been measured as a function of energy using a fine grained position detector placed at a depth of − 3.5small chi, Greek0. The noise arising both from the electronics chain and from the uranium radioactivity is compared with 70 GeV/c muon signals. The ratio of the electron to pion response has been measured both as a function of the energy and of the electric field. The high lateral and longitudinal granularity of the calorimeter and the presence of a position detector have been used to determine the electron pion separation as a function of energy.
Published: 1990

13. A study of the D∗ content of jets at the CERN p collider

Author: I. F. Fensome, Carmen Albajar, S. Levegrün, G. Bauer, G. Pancheri, E. Eisenhandler, C. D. Buchanan, K. Morgan, R. Martinelli, T. P. Shah, V. Vuillemin, W. von Schlippe, K. Bos, P. Cennini, S. Tether, Christopher Seez, D. Joyce, A. Moulin, G. Busetto, Steve McMahon, Anton Taurok, A. Bezaguet, M. Passaseo, J.P. Vialle, K. Eggert, Ritva Kinnunen, M. Felcini, D. Brockhausen, B. Buschbeck, Claudia J. Stubenrauch, S. Lammel, A. Gonidec, D. J. Holthuizen, T. Moers, J. P. Mendiburu, H. Faissner, Th. Müller, W. Jank, M. Nikitas, D. Drijard, Stephen Wimpenny, Sergio Cittolin, E. Pietarinen, Daniel Denegri, O. C. Allkofer, P. Nedelec, S. Bartha, S. Centro, M. Rauschkolb, A. Kernan, S. A. Robins, M. A. Marquina, Alessandro Bettini, G. Thompson, C. Markou, B. Andrieu, A. Morsch, D. Kryn, I. Zacharov, L. Dobrzynski, G.F. Cox, H. Castilla-Valdez, J. Vrana, M. Demoulin, Stefano Veneziano, Daniel J. Smith, P. Casoli, A. Geiser, G. Jorat, F. Szoncso, L. Zanello, Jonathan M. Gregory, Matthias Schröder, J. D. Dowell, A. Diciaccio, K. Ankoviak, Teresa Rodrigo, David B. Cline, L. Taylor, D. Schinzel, A. Caner, Nicolas Ellis, P. Biddulph, M. P. J. Landon, P. I. P. Kalmus, Veikko Karimäki, R. Apsimon, R. Munoz, V. O'Dell, Emilio Petrolo, L. Fortson, C. Bacci, K. Wacker, Hans Reithler, M. Mohammadi, James Rohlf, H. Bohn, A. van Dijk, Manfred Krammer, Konstanty Sumorok, Pierluigi Zotto, J. Salicio, E. F. Clayton, D. Samyn, R. Prosi, C. Daum, C.-E. Wulz, J. Dorenbosch, R. Conte, G. Maurin, B. Gonzales, M. Markytan, J. P. Porte, E. Torrente-Lujan, J. P. Revol, S. Otwinowski, X. Wu, Paraskevas Sphicas, W. van de Guchte, M. Pimiä, J. Colas, M. Botlo, J. Gronberg, Tejinder Virdee, Francesco Lacava, A. Norton, F. Cavanna, Jorma Tuominiemi, Alain Givernaud, G. Piano Mortari, John A Coughlan, F. J. Diez Hedo, E. Radermacher, Michael Albrow, Anna Teresa Meneguzzo, A. Ferrando, Peter Lipa, M. Lindgren, Ludovico Pontecorvo, D. Dau, M. Della Negra, Maria Isabel Josa, R. Bonino, T. C. Meyer, L. Naumann, Y. Lemoigne, D. Linglin, H. Tuchscherer, Aleandro Nisati, M. Yvert, H. Evans, G. Ciapetti, Jean-Pierre Merlo, C. Rubbia, D. H. Stork, J. Garvey, M. Vargas, Y. Zolnierowski, Felicitas Pauss, M. Ikeda, Filippo Ceradini, T. A. Fuess, B. Aubert, Dave Robinson, A. Placci, I. R. Kenyon, H. Dibon, A. Böhrer, and G. Sajot
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Meson production, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, 01 natural sciences, 7. Clean energy, Nuclear physics, Transverse plane, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract: We have measured the rate of D∗± meson production inside the jets produced in p p collisions at √s = 630 GeV. For jets in the transverse energy range 15
Published: 1990

14. Studies of intermediate vector boson production and decay in UA1 at the CERN proton-antiproton collider

Author: W. G. Scott, Hans Reithler, Tejinder Virdee, R. Frey, Francesco Lacava, J. R. Batley, I. F. Fensome, P. Flynn, K. Morgan, D. Kryn, C. Perault, M. Yvert, A. Placci, D. J. Holthuizen, G.H. Grayer, N. Bains, E. Radermacher, J. P. Porte, S. Centro, C. Bacci, Veikko Karimäki, Ehud Duchovni, H. Faissner, M. Botlo, I. Siotis, D. G. Charlton, W.J. Haynes, Carmen Albajar, M. Mohammadi, L. Naumann, D. Dau, W. Kienzle, J. P. Merlo, C. Cochet, T. P. Shah, H. G. Moser, M. Demoulin, Pierluigi Zotto, Alessandro Bettini, G. Thompson, G.F. Cox, T. Bacon, J. Colas, G. Busetto, Anton Taurok, A. van Dijk, L. Dobrzynski, E. Tscheslog, A. Diciaccio, G.T.J. Arnison, M.-N. Minard, G. Jorat, Jonathan M. Gregory, D. Schinzel, J. Streets, Sergio Cittolin, I. Sheer, Ritva Kinnunen, M. Pimiä, P. M. Watkins, B. Mours, M. Corden, I. Wingerter, J. Kroll, Asoke K. Nandi, F. Szoncso, F. Cavanna, G. Walzel, J. P. Lees, E. Buckley, A. Schwartz, Margret Fincke-Keeler, Shu Li, G. Ciapetti, Philippe Ghez, W. R. Gibson, G. Piano Mortari, Matthias Schröder, J. Dorenbosch, A. Savoy-Navarro, D. Linglin, L. Villasenor, G. Maurin, W. van de Guchte, D. Clarke, W. von Schlippe, H. D. Wahl, Aleandro Nisati, L. Taylor, Alain Givernaud, P. Sphicas, D. Samyn, F. J. Diez Hedo, G. Bauer, J. Vrana, D. Joyce, Bruce Denby, Michael Albrow, M. A. Marquina, J. N. Bellinger, J. P. Debrion, P. Catz, S. Beingessner, S. Levegrün, I. ten Have, A. Bezaguet, Emilio Petrolo, L. Zanello, John A Coughlan, K. Bos, A. Moulin, P. Kyberd, D. Cline, James Rohlf, B. Aubert, P. Nedelec, Akram Khan, P. Colas, Y. Giraud-Héraud, G. Fontaine, T. Redelberger, Xin Wu, Kenneth Long, Peter Lipa, Achim Geiser, Thomas W. Markiewicz, G. Sajot, A. Norton, J. P. Revol, E. Eisenhandler, Christian Ghiglino, J. Garvey, Nicolas Ellis, C. Markou, Daniel J. Smith, Teresa Rodrigo, M. Lindgren, Charling Tao, J. D. Dowell, E. Pietarinen, A. Astbury, Th. Müller, Vivian O'Dell, P. I. P. Kalmus, C. Pigot, T. Meyer, M. Della Negra, S. Geer, A. Honma, Felicitas Pauss, M. Ikeda, M. Markytan, Filippo Ceradini, C. Rubbia, C. Ghesquire, V. Vuillemin, R. J. Homer, M. Jimack, W. Jank, H. Grassmann, R. Bonino, S. Tether, Christopher Seez, K. Eggert, J.P. Vialle, B. Van Eijk, Stephen Haywood, I. Zacharov, A. Wildish, T. Axon, J. Sass, M. Debeer, R. Sobie, Nicolas Zaganidis, I. R. Kenyon, P. Erhard, Jorma Tuominiemi, J. P. Mendiburu, M. Preischl, Daniel Denegri, A. Gonidec, Murrough Landon, Anna Teresa Meneguzzo, Dave Robinson, J. D. Richman, A. Ferrando, G. Pancheri, O. C. Allkofer, H. F. Hoffmann, K. Wacker, R. Edgecock, M. Degiorgi, J. Randsdell, C.-E. Wulz, Elizabeth Locci, J. P. Laugier, Stephen Wimpenny, Claudia J. Stubenrauch, Josef Strauss, G. Salvini, A. Kernan, Terry Richard Wyatt, D. J. Summers, R. Leuchs, Richard Keeler, M. Moricca, Manfred Krammer, Konstanty Sumorok, P. Cennini, 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), UA1, and BOMBAR, Claudine
Subjects: Particle physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics and Astronomy (miscellaneous), Elementary particle, 7. Clean energy, 01 natural sciences, law.invention, Vector boson, Standard Model, Nuclear physics, law, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, Collider, Engineering (miscellaneous), Physics, Muon, Large Hadron Collider, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Weinberg angle, Antiproton, Physics::Accelerator Physics, High Energy Physics::Experiment, Particle Physics - Experiment
Abstract: An extensive study of production and decay properties of charged and neutral Intermediate Vector Bosons (IVB) at the CERN proton-antiproton collider is presented. Intermediate Vector Bosons were detected in the electron, muon, and tau decay modes at centre-of-mass energies of 0.546 and 0.630 TeV. This paper is a summary, based on all the available data from the UA1 experiment from the running periods 1982–1985. Results are presented and compared with expectations of the Standard Eletroweak Model and QCD-improved Drell-Yan annihilation processes. The general conclusion is that there is an excellent agreement between the predictions of the Standard Model and our measurements.
Published: 1989

15. Bose-Einstein correlations in pp interactions at √s=0.2 to 0.9 TeV

Author: Hans Reithler, H. Bohn, P. Cennini, Christian Ghiglino, E. F. Clayton, W. G. Scott, M. Jimack, Alain Givernaud, C.-E. Wulz, M. Schröder, Sergio Cittolin, I. ten Have, G. Sajot, D. Kryn, I. F. Fensome, F. J. Diez Hedo, Steve McMahon, Anton Taurok, Emilio Petrolo, T. Moers, J. P. Porte, J. Vrana, R. Conte, M. Yvert, T. Bacon, G. Walzel, K. Morgan, H. Faissner, R. Leuchs, L. Zanello, R. Prosi, F. Szoncso, L. Taylor, D. Samyn, A. Astbury, E. Tscheslog, Daniel J. Smith, P. Nedelec, N. Bains, Teresa Rodrigo, Akram Khan, P. Colas, G. Maurin, M. Markytan, W. van de Guchte, M. Pimiä, J. D. Dowell, A. Moulin, K. Ankoviak, David B. Cline, Dave Robinson, L. Dobrzynksi, V. O'Dell, P. I. P. Kalmus, J. P. Mendiburu, A. Placci, A. van Dijk, Paraskevas Sphicas, H. G. Moser, S. Tether, Murrough Landon, Nicolas Ellis, P. Biddulph, Anna Teresa Meneguzzo, Dave Charlton, D. Schinzel, C. Bacci, S. Beingessner, M. Botlo, A. Schwartz, I. Siotis, G. Bauer, A. Bezaguet, A. Ferrando, G. Ciapetti, John A Coughlan, G. Cox, Stefano Veneziano, L. Fortson, B. Buschbeck, J.P. Vialle, M. Nikitas, W.J. Haynes, T. C. Meyer, D. J. Holthuizen, R. K. Keeler, K. Bos, J. Dorenbosch, E. Radermacher, B. Aubert, Alessandro Bettini, Michael Albrow, Ritva Kinnunen, D. Linglin, Carmen Albajar, A. Caner, J. P. Revol, O. C. Allkofer, Th. Müller, G. Thompson, H. Dibon, B. Mours, I. Zacharov, V. Vuillemin, W. Jank, G. Pancheri, P. Casoli, G. Busetto, J. Colas, K. Wacker, I. Wingerter, Peter Lipa, S. Centro, J. P. Debrion, M. Mohammadi, Christopher Seez, B. Andrieu, M. Demoulin, Manfred Krammer, A. Geiser, Konstanty Sumorok, K. Eggert, Jean-Pierre Merlo, Veikko Karimäki, M. Lindgren, A. Norton, T. Redelberger, C. Rubbia, F. Cavanna, D. Dau, M. Della Negra, S. Geer, G. Jorat, P. Erhard, A. Kernan, G. Piano Mortari, I. R. Kenyon, Jonathan M. Gregory, A. Böhrer, Pierluigi Zotto, S. Levegrün, R. Apsimon, Y. Giraud-Héraud, M. Preischl, E. Pietarinen, Daniel Denegri, A. Diciaccio, X. Wu, Jorma Tuominiemi, Claudia J. Stubenrauch, S. Lammel, A. Gonidec, G. Salvini, T. P. Shah, W. Kienzle, C. Markou, J. Sass, R. Bonino, T. Feuss, Margret Fincke-Keeler, Aleandro Nisati, J. Garvey, E. Eisenhandler, Felicitas Pauss, M. Ikeda, Filippo Ceradini, J. Kroll, M. A. Marquina, James Rohlf, W. von Schlippe, Tejinder Virdee, Francesco Lacava, C. Zaccardelli, D. Joyce, L. Naumann, and M. Degiorgi
Subjects: Physics, Nuclear and High Energy Physics, Interaction model, Bose–Einstein correlations, Charged particle, law.invention, Nuclear physics, law, Pseudorapidity, Particle, High Energy Physics::Experiment, Angular dependence, Collider, Constant (mathematics)
Abstract: Bose-Einstein correlations have been measured at the SPS collider at centre-of-mass energies from √ s =0.2 to 0.9 TeV. The size and the incoherence parameter of the particle emitting region have been determined as a function of charged particle density in pseudorapidity Δ n /Δη, centre-of-mass energy and the direction of emission of the charged particles. For fixed values of Δ n /Δη the size of the interaction region and the incoherence parameter remain constant with rising √ s . At fixed √ s , the size of the interaction region increases with rising charged particle density while the incoherence parameter decreases.
Published: 1989

16. Two-jet mass distributions at the CERN proton-antiproton collider

Author: P. Nedelec, D. Samyn, D. J. Holthuizen, A. Schwartz, Akram Khan, P. Colas, I. Siotis, W.J. Haynes, Ehud Duchovni, M. Jimack, D. Robinson, Carmen Albajar, Nicolas Ellis, J. P. Revol, S. Centro, Christopher Seez, J. P. Merlo, D. Summers, B. Aubert, A. Wildish, A. Placci, X. Wu, M. Demoulin, L. Dobrzynski, R. K. Keeler, D. Linglin, P. Ghez, Ritva Kinnunen, L. Villasenor, Jorma Tuominiemi, T. P. Shah, C. Ghesquiere, Felicitas Pauss, M. Ikeda, P. Cennini, P. Erhard, J. D. Dowell, G. Sajot, G. Maurin, Filippo Ceradini, S. Li, M. A. Marquina, M. Schröder, Sergio Cittolin, I. R. Kenyon, B. Mours, Jacqueline Batley, W. van de Guchte, M. Pimiä, Josef Strauss, D. Clarke, E. Tscheslog, Emilio Petrolo, A. Diciaccio, J. P. Lees, M.J. Corden, S. J. Haywood, Daniel J. Smith, Nicolas Zaganidis, C. Markou, I. Wingerter, W. Kienzle, R. Leuchs, C. Rubbia, J. Kroll, G. Jorat, G. Bauer, W. G. Scott, Teresa Rodrigo, T. Redelberger, E. Buckley, Jonathan M. Gregory, I. Sheer, M. Preischl, E. Pietarinen, Daniel Denegri, G. Walzel, F. Szoncso, Alain Givernaud, J. Vrana, V. Vuillemin, F. J. Diez Hedo, J. Sass, L. Zanello, O. C. Allkofer, A. Moulin, Tejinder Virdee, H. G. Moser, G. Busetto, K. Sumorok, C. Bacci, H. Grassmann, M. Markytan, J. Colas, Francesco Lacava, C. Perault, P. I. P. Kalmus, M. Yvert, P. Sphicas, H. Faissner, A. Bezaguet, A. van Dijk, J. Rohlf, N. Bains, Hans Reithler, D. Gee, J. P. Mendiburu, D. Kryn, I. F. Fensome, P. Flynn, John A Coughlan, Randall Sobie, S. Beingessner, G. Cox, Margret Fincke-Keeler, K. Morgan, Th. Müller, E. Radermacher, W. Jank, J. Dorenbosch, Murrough Landon, Anna Teresa Meneguzzo, J. P. Porte, L. Naumann, M. Mohammadi, A. Norton, Dave Charlton, A. Taurok, J. Streets, C. Pigot, Claudia J. Stubenrauch, A. Gonidec, Aleandro Nisati, A. Ferrando, G. Salvini, C. Cochet, G. Piano Mortari, G. Ciapetti, Stephen Wimpenny, M.-N. Minard, Michael Albrow, J. Garvey, D. Schinzel, K. Bos, C. Chiglino, J. P. Debrion, M. Degiorgi, A. Kernan, C.-E. Wulz, Elizabeth Locci, David B. Cline, A. Astbury, R. Bonino, S. Tether, J.P. Vialle, K. Wacker, I. Zacharov, Manfred Krammer, T. Axon, A. Geiser, Alessandro Bettini, G. Thompson, Veikko Karimäki, T. C. Meyer, T. C. Bacon, I. ten Have, Pierluigi Zotto, S. Levegrün, Y. Giraud-Héraud, T. Wyatt, Peter Lipa, T. Markiewicz, M. Lindgren, Charling Tao, D. Dau, M. Della Negra, S. Geer, K. Eggert, W. von Schlippe, C. Zaccardelli, D. Joyce, P. Catz, G. Fontaine, and E. Eisenhandler
Subjects: Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Gauge boson, Particle physics, Large Hadron Collider, Proton, Jet (particle physics), law.invention, Nuclear physics, Cross section (physics), law, Antiproton, High Energy Physics::Experiment, Nuclear Experiment, Collider, Particle Physics - Experiment
Abstract: Two-jet mass distributions have been measured as a function of centre-of-mass scattering angle for high-mass jet pairs produced in proton-antiproton collisions at the CERN collider operating at a centre-of-mass energy of 630 GeV. The agreement between QCD expectations and the experimental measurements has been used to place limits on the production cross section of an object X decaying into two jets. In particular we consider the existence of a massive colour octet of vector gauge bosons (axigluons). We exclude axigluons with a width ΛA
Published: 1988

17. Measurement of the bottom quark production cross section in proton-antiproton collisions at √s = 0.63 TeV

Author: C. Markou, L. Dobrzynski, T. Redelberger, Hans Reithler, G. Bauer, A. Diciaccio, E. Tscheslog, Daniel J. Smith, Teresa Rodrigo, Alessandro Bettini, G. Jorat, G. Thompson, K. Morgan, G. Sajot, Jonathan M. Gregory, P. I. P. Kalmus, J. Sass, I. Sheer, S. Tether, J. Rohlf, R. Bonino, J. P. Porte, T. C. Meyer, G. Maurin, J. Dorenbosch, T. Bacon, D. Linglin, A. Moulin, K. Eggert, L. Villasenor, P. Ghez, G. Walzel, W. van de Guchte, M. Pimiä, M. Yvert, D. Clarke, D. J. Holthuizen, D. Samyn, Ehud Duchovni, P. Sphicas, H. G. Moser, J. P. Debrion, M. Jimack, M. A. Marquina, V. Vuillemin, N. Bains, G. Busetto, Felicitas Pauss, M. Ikeda, Veikko Karimäki, D. Robinson, S. Centro, Michael Albrow, D. Summers, A. Bezaguet, P. Cennini, Filippo Ceradini, A. Kernan, S. Levegrün, C. Bacci, P. Cavanna, Christopher Seez, M. Degiorgi, John A Coughlan, M. Demoulin, E. Radermacher, V. O'Dell, Tejinder Virdee, X. Wu, Christian Ghiglino, M.-N. Minard, J. Kroll, Francesco Lacava, C. Perault, Pierluigi Zotto, A. van Dijk, Alain Givernaud, Y. Giraud-Héraud, Th. Müller, Claudia J. Stubenrauch, C. Cochet, D. Schinzel, A. Gonidec, J. D. Dowell, S. Beingessner, G. Salvini, W. Jank, G. Ciapetti, C.-E. Wulz, I. ten Have, Peter Lipa, Elizabeth Locci, A. Placci, F. J. Diez Hedo, C. Ghesquiere, P. Erhard, T. Markiewicz, K. Wacker, J. P. Lees, J. P. Revol, R. K. Keeler, Jorma Tuominiemi, T. P. Shah, R. Leuchs, Ritva Kinnunen, M. Lindgren, Charling Tao, Manfred Krammer, L. Naumann, W. Kienzle, David B. Cline, M. Botlo, A. Schwartz, G. Cox, K. Sumorok, B. Van Eijk, D. Dau, A. Astbury, J. Garvey, P. Nedelec, I. Siotis, S. Li, C. Pigot, B. Mours, Stephen Wimpenny, M. Della Negra, W.J. Haynes, S. Geer, I. R. Kenyon, M.J. Corden, S. J. Haywood, J. Colas, Akram Khan, P. Colas, Carmen Albajar, I. Wingerter, C. Rubbia, Margret Fincke-Keeler, M. Preischl, E. Pietarinen, Daniel Denegri, J. P. Merlo, A. Norton, G. Piano Mortari, Aleandro Nisati, J.P. Vialle, Nicolas Ellis, Emilio Petrolo, O. C. Allkofer, M. Markytan, I. Zacharov, B. Aubert, T. Axon, J. Vrana, A. Geiser, L. Zanello, H. Faissner, J. R. Batley, I. F. Fensome, P. Flynn, A. Wildish, Randall Sobie, M. Mohammadi, Nicolas Zaganidis, J. P. Mendiburu, Murrough Landon, Anna Teresa Meneguzzo, Dave Charlton, A. Ferrando, M. Schröder, Sergio Cittolin, F. Szoncso, E. Buckley, K. Bos, W. von Schlippe, C. Zaccardelli, D. Joyce, W. G. Scott, H. Grassmann, D. Kryn, G. Fontaine, A. Taurok, and E. Eisenhandler
Subjects: Physics, Quantum chromodynamics, Quark, Nuclear and High Energy Physics, Particle physics, Muon, Proton, Hadron, Bottom quark, Nuclear physics, Antiproton, High Energy Physics::Experiment, Rapidity, Nuclear Experiment, Particle Physics - Experiment
Abstract: We summarize the results obtained in the UA1 experiment on the production of bottom quarks in proton-antiproton collisions at √ s =0.63 TeV. Independent muon data samples are used to determine the bottom quark production cross section in different transverse momentum ranges from 6 to 30 GeV. A recent theoretical calculation to O(α s 3 ) of the inclusive bottom quark transverse momentum spectrum in hadronic collisions shows reasonable agreement with the data. We extrapolate the integral P T distribution to P T =0 and in rapidity to estimate the total cross section forthe production of bottom quark pairs. Assuming the shape in P T and rapidity given by the O(α s 3 ) calcultaion, we obtain σ( p p→b b +X) = 10.2 ±3.3 μb .
Published: 1988

18. Events with large missing transverse energy at the CERN collider: III. Mass limits on supersymmetric particles

Author: Stephen Wimpenny, T. Bacon, G. Maurin, M. Pimiä, D. Clarke, Anna Teresa Meneguzzo, Dave Charlton, W. G. Scott, K. Sumorok, J. P. Lees, Michael Levi, J. D. Dowell, John A Coughlan, A. Ferrando, G. Walzel, R. Leuchs, Christian Ghiglino, Margret Fincke-Keeler, M. Degiorgi, D. Samyn, Ehud Duchovni, M. Jimack, D. J. Holthuizen, G.H. Grayer, D. Robinson, S. Centro, M. Demoulin, Aleandro Nisati, Alessandro Bettini, G. Thompson, M.-N. Minard, J. N. Bellinger, D. Summers, J. Vrana, C. Ghesquiere, D. Schinzel, G. Cox, C.-E. Wulz, H. Faissner, T. P. Shah, N. Zaganidis, Kenneth Long, G. Busetto, Elizabeth Locci, J. P. Laugier, J. R. Batley, I. F. Fensome, P. Flynn, Randall Sobie, W. Kienzle, A. Kernan, W. von Schlippe, L. Zanello, M. Mohammadi, B. Aubert, R. Frey, Alain Givernaud, F. J. Diez Hedo, A. Taurok, C. Zaccardelli, H. G. Moser, Bruce Denby, A. Bezaguet, P. Catz, J. Dorenbosch, A. Savoy-Navarro, P. Nedelec, Akram Khan, P. Colas, A. Wildish, Michael Albrow, Christopher Seez, S. Tether, Hans Reithler, Felicitas Pauss, M. Ikeda, Filippo Ceradini, J. P. Debrion, D. Gee, G. Fontaine, Nicolas Ellis, W. Ruhm, J. P. Mendiburu, T. Redelberger, A. Schwartz, M. Preischl, E. Pietarinen, Daniel Denegri, J. Kroll, L. Naumann, K. Morgan, E. Eisenhandler, I. Siotis, W.J. Haynes, T. Markiewicz, Veikko Karimäki, P. Erhard, G. Sajot, K. Eggert, C. Pigot, T. Meyer, A. Diciaccio, A. Placci, Carmen Albajar, S. Beingessner, J. Garvey, Charling Tao, G. Bauer, E. Tscheslog, David B. Cline, E. Petrolo, Daniel J. Smith, D. Dau, M. Della Negra, Pierluigi Zotto, S. Geer, J. P. Merlo, A. Honma, Teresa Rodrigo, J. P. Porte, I. ten Have, P. I. P. Kalmus, X. Wu, Ritva Kinnunen, S. Levegrün, E. Buckley, A. Astbury, S. Li, B. Mours, M.J. Corden, S. J. Haywood, M. Debeer, R. Edgecock, R. Bonino, Jorma Tuominiemi, Richard Keeler, M. Schröder, Sergio Cittolin, I. Wingerter, Y. Giraud-Héraud, T. Wyatt, J.P. Vialle, J. Rohlf, I. R. Kenyon, K. Wacker, O. C. Allkofer, I. Zacharov, Manfred Krammer, T. Axon, Jeffrey Richman, A. Geiser, P. Ghez, E. Radermacher, Josef Strauss, D. Linglin, L. Villasenor, Asoke K. Nandi, F. Szoncso, C. Markou, J. Sass, J. Streets, Paolo Rossi, M. A. Marquina, Claudia J. Stubenrauch, A. Gonidec, G. Salvini, M. Yvert, P. Sphicas, Tejinder Virdee, Francesco Lacava, N. Bains, C. Perault, V. Vuillemin, K. Bos, C. Cochet, G. Ciapetti, H. von der Schmitt, C. Rubbia, M. Moricca, J. P. Revol, Th. Müller, W. Jank, L. Dobrzynski, G. Jorat, I. Sheer, H. Grassmann, D. Kryn, P. Cennini, C. Bacci, M. Markytan, B. Van Eijk, Peter Watkins, J. Colas, A. Norton, and G. Piano Mortari
Subjects: Physics, Nuclear and High Energy Physics, Stop squark, Gluino, Particle physics, Large Hadron Collider, High Energy Physics::Phenomenology, Lightest Supersymmetric Particle, law.invention, Nuclear physics, Massless particle, law, High Energy Physics::Experiment, Limit (mathematics), Nuclear Experiment, Collider, Photino
Abstract: A sample of events with large missing transverse energy from 715 nb −1 of data from the UA1 experiment at the CERN proton-antiproton collider is used to search for evidence of supersymmetric particle production. Assuming that the photino is the lightest supersymmetric particle and that it is massless, we find a limit on the squark mass of m q >45 GeV /c 2 at 90% CL, independently of the gluino mass. Similarly, we find a limit on the gluino mass of m g >53 GeV /c 2 (at 90% CL) independently of the squark mass, provided that the gluino is not long-lived (i.e. provided that the squark is not too heavy, m q ⪅1 TeV /c 2 ). For equal squark and gluino masses we find a limit m q =m g >75 GeV /c 2 at 90% CL. The effect of a non-zero photino mass on these limits is studied.
Published: 1987

19. Test of a quark-diquark fragmentation mechanism in proton-proton interactions at 360 GeV/c

Author: G. Pinter, Teresa Rodrigo, G. Zholobov, J. L. Bailly, J-C. Marin, K. Sudhakar, T. Tsurugai, Josef Hrubec, U. Trevisan, F. Fontanelli, P. Girtler, B. Buschbeck, H. Dibon, Y. Chiba, P. Porth, Tachishige Hirose, L. Mohtanet, Y. Iga, Albert Ferrando, A. Batunin, Tsuneo Emura, S. Squarcia, G. Neuhofer, M. Markytan, V. Yarba, E. P. Kistenev, I. V. Gorelov, L. A. Tikhonova, P. K. Malhotra, R. Hamatsu, A. Gurtu, T. Gemesy, C. Caso, F. J. Diez-Hedo, Tetsuro Kobayashi, S. Krasznovszky, J. B. Singh, I. S. Mittra, J. M. Kohli, Ph. Herquet, and B. Epp
Subjects: Quark, Physics, Particle physics, Physics and Astronomy (miscellaneous), High Energy Physics::Lattice, Nuclear Theory, High Energy Physics::Phenomenology, Elementary particle, Hadronization, Diquark, Nuclear physics, Fragmentation (mass spectrometry), High Energy Physics::Experiment, Quantum field theory, Nuclear Experiment, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: Feynmanx distributions for the inclusive reactionsP+P→hadron+anything at 360 GeV/c are analyzed in terms of a quark-diquark fragmentation model. The proton is assumed to be composed either of a quark and a diquark or of three independent quarks. The model tested includes a hadronization part for which we use the Field-Feynman and LUND fragmentation functions. The model with diquarks gives a better description of our experimental data; in particular forP+P→Λ0+anything, the model without diquarks fails to reproduce the data.
Published: 1986

20. Analysis of transverse momentum distributions for $pp$ interactions at 360 GeV/c in the framework of a quark-diquark fragmentation model

Author: L. Montanet, S. Krasznovszky, V. G. Gavrjusev, G. Zholobov, N. Khalatyan, L. A. Tikhonova, P. K. Malhotra, J. M. Kohli, Yu. Ivanyshevkov, P. Girtler, B. Buschbeck, C. Caso, U. Trevisan, Y. Iga, Tachishige Hirose, Josef Hrubec, B. Epp, J.N. Macnaughton, F. Fontanelli, Teresa Rodrigo, P. Herquet, P. Porth, R. Hamatsu, E. P. Kistenev, K. Sudhakar, H. Dibon, V. M. Kubik, S. Squarcia, S. A. Zotkin, J. Salicio, S. N. Ganguli, Y. Chiba, Albert Ferrando, G. Neuhofer, F. J. Diez-Hedo, F. Bruyant, Tetsuro Kobayashi, J. L. Bailly, T. Tsurugai, J. B. Singh, L. Jenik, and K. Takahashi
Subjects: Quark, Physics, Particle physics, Physics and Astronomy (miscellaneous), High Energy Physics::Lattice, High Energy Physics::Phenomenology, Nuclear Theory, Hadron, Elementary particle, Nuclear physics, Diquark, Distribution function, Fragmentation (mass spectrometry), Transverse momentum, High Energy Physics::Experiment, Quantum field theory, Nuclear Experiment, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: Using a quark-diquark fragmentation model, in which either the Field-Feynman or the Lund model is coupled with a quark-diquark distribution function, we study transverse momentum distributions,p T, for the inclusive reactionspp→hadron +anything at 360 GeV/c. We find that a primordial mean transverse momentum 〈k T〉≃0.4 GeV/c can well reproduce thep T 2 distributions of charged hadrons, π0,K s 0 , Λ0,K * and Σ* and the Feynmanx−p T correlations. We confirm that a diquark in a proton plays an important role in reproducing thex−p T correlation of Λ0.
Published: 1987

21. Inclusive pion production in 360 GeV/cpp interactions

Author: B. Buschbeck, Y. Iga, U. Trevisan, S. Kitamura, V. Stopchenko, J. L. Bailly, T. Tsurugai, P. Porth, S. Squarcia, J.N. Macnaughton, S. A. Zotkin, R. Raghavan, Ph. Herquet, G. Zholobov, N. Khalatyan, F. J. Diez-Hedo, S. Matsumoto, H. Dibon, Josef Hrubec, P. K. Malhotra, J. B. Singh, F. Fontanelli, I. S. Mittra, Albert Ferrando, J. M. Kohli, W. Bartl, G. Neuhofer, E. P. Kistenev, C. Caso, D. Kuhn, I. V. Gorelov, T. Yamagata, N. Oshima, R. Hamatsu, A. Gurtu, J. Salicio, B. Epp, Teresa Rodrigo, L. Montanet, S. N. Ganguli, and K. Takahashi
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Nuclear Theory, Hadron, Charge (physics), Elementary particle, Nuclear physics, Particle acceleration, Pion, Phenomenological model, Production (computer science), Quantum field theory, Nuclear Experiment, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: In a study of proton-proton interactions at$\sqrt s = 26GeV$, inclusive distributions of single pions and systems of pions of various charge combinations are presented, as well as the production ratio obtained in association with various trigger particles. The results are compared to current phenomenological models in an attempt to understand multiparticle productions in hadron collisions.
Published: 1987

22. Search For New Heavy Quarks At the Cern Proton-antiproton Collider

Author: D. J. Holthuizen, G.H. Grayer, J. Dorenbosch, A. Savoy-Navarro, G. Cox, Murrough Landon, Anna Teresa Meneguzzo, D. Robinson, Dave Charlton, J. Garvey, S. Centro, Kenneth Long, G. Sajot, K. Eggert, P. Cennini, M. Demoulin, A. Ferrando, W. G. Scott, Hans Reithler, D. Gee, J. P. Debrion, W. von Schlippe, Michael Albrow, J. P. Revol, G. Maurin, M. Pimiä, D. Clarke, T. Bacon, Christopher Seez, M. Preischl, E. Pietarinen, Daniel Denegri, K. Morgan, P. Erhard, E. Buckley, Alain Givernaud, L. Naumann, C. Zaccardelli, H. Grassmann, Bruce Denby, C. Pigot, P. Sphicas, Alessandro Bettini, G. Thompson, P. Catz, G. Walzel, D. Kryn, Felicitas Pauss, M. Ikeda, Filippo Ceradini, H. G. Moser, F. J. Diez Hedo, J. Kroll, Emilio Petrolo, T. Markiewicz, M. Schröder, Sergio Cittolin, P. Rossi, G. Busetto, R. Kunnunen, J. D. Dowell, J. P. Porte, Nicolas Zaganidis, C. Bacci, A. Bezaguet, David B. Cline, K. Sumorok, J. Vrana, A. Kernan, T. Redelberger, John A Coughlan, D. Linglin, Margret Fincke-Keeler, E. Tscheslog, A. Taurok, M. Yvert, L. Villasenor, G. Fontaine, M. A. Marquina, M. Markytan, H. Faissner, J. R. Batley, I. F. Fensome, P. Flynn, Randall Sobie, L. Zanello, Aleandro Nisati, E. Eisenhandler, A. van Dijk, T. P. Shah, Veikko Karimäki, P. Nedelec, I. Zacharov, D. Dau, J. Colas, Teresa Rodrigo, P. I. P. Kalmus, J. P. Mendiburu, Akram Khan, P. Colas, J. N. Bellinger, M. Degiorgi, G. Bauer, E. Radermacher, W. Kienzle, Pierluigi Zotto, P. Ghez, N. Bains, H. von der Schmitt, Charling Tao, T. Axon, A. Norton, S. Beingessner, Asoke K. Nandi, F. Szoncso, M. Mohammadi, W. Ruhm, Stephen Wimpenny, M. Della Negra, Nicolas Ellis, Jeffrey Richman, A. Geiser, R. Leuchs, S. Geer, C.-E. Wulz, G. Piano Mortari, A. Honma, Elizabeth Locci, Jorma Tuominiemi, C. Ghesquiere, M.-N. Minard, J. P. Laugier, A. Astbury, L. Dobrzynski, K. Wacker, D. Schinzel, J. P. Lees, M. Moricca, C. Cochet, David Smith, Manfred Krammer, A. Diciaccio, C. Ghighno, G. Ciapetti, G. Jorat, R. Edgecock, J. Ransdell, I. Sheer, Tejinder Virdee, Francesco Lacava, O. C. Allkofer, Josef Strauss, S. Levegrün, C. Perault, R. K. Keeler, R. Bonino, Y. Giraud-Héraud, T. Wyatt, A. Placci, J. Streets, S. Tether, K. Bos, J. Rohlf, Claudia J. Stubenrauch, A. Gonidec, V. Vuillemin, G. Salvini, Th. Müller, C. Rubbia, M. Debeer, D. Samyn, Ehud Duchovni, M. Jimack, T. C. Meyer, A. Schwartz, W. Jank, P. M. Watkins, I. Siotis, I. R. Kenyon, J.P. Vialle, D. Summers, W.J. Haynes, Carmen Albajar, S. Li, J. P. Merlo, B. Mours, B. Aubert, M.J. Corden, S. J. Haywood, A. Wildish, I. ten Have, I. Wingerter, Xin Wu, C. Markou, and J. Sass
Subjects: Quark, Physics, Quantum chromodynamics, Particle physics, Top quark, Muon, Physics and Astronomy (miscellaneous), Proton, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Strong interaction, 01 natural sciences, 7. Clean energy, Nuclear physics, Antiproton, 0103 physical sciences, High Energy Physics::Experiment, Production (computer science), 010306 general physics, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: We report on a search for new heavy quarks using data collected by the UA1 experiment during 1983, 1984 and 1985 at the CERN proton-antiproton collider, corresponding to an integrated luminosity of approximately 700 nb−1. Studying events with a muon or an isolated electron, accompanied by one or more jets, we find good agreement between our data and Monte Carlo predictions for the production of charm and beauty, without the need for a new quark. A top quark model, involving the decayW→t $$\bar b$$ and directt $$\bar t$$ production via the strong interaction, is used to determine our detection efficiency for top. This allows us to place an upper limit on the cross section for producing top quarks as a function of the top quark mass. Our analysis is not sensitive to theW→t $$\bar b$$ process alone. By comparing our limit with a calculation of thet $$\bar t$$ cross section, added to theW→t $$\bar b$$ cross section derived from our own measurements ofW →lv, we are able to place a lower limit on the mass of the top quark. From the lowest order (α 2 ) calculation, using the choice of structure functions andQ 2 scale that give the lowest cross section, we find: $$m_{top} > 44GeV/c^2 \left( {95\% c.l.} \right).$$ Including an estimate of the next higher order (α 2 ) and calculating the cross section with the EUROJET QCD Monte Carlo program using a less extreme choice for the structure functions andQ 2 scale gives: $$m_{top} > 56GeV/c^2 \left( {95\% c.l.} \right).$$ A search has also been made for a fourth generation, charge 1/3 quark (b'). Assuming that theb' mass is smaller than that of the top quark and that it can-not be produced inW decays, the mass limits, using the above procedures, are respectivelym b' >32 GeV/c2 andm b' >44 GeV/c2, both at 95% confidence level.
Published: 1988

23. Intermediate vector boson cross sections at the CERN super proton synchrotron collider and the number of neutrino types

Author: Anna Teresa Meneguzzo, Dave Charlton, A. Ferrando, G. Cox, P. Nedelec, Akram Khan, P. Colas, W. G. Scott, P. Ghez, Kenneth Long, K. Bos, J. Colas, Christian Ghiglino, G. Sajot, Josef Strauss, S. Beingessner, H. Grassmann, D. Kryn, M. Debeer, H. Faissner, Hans Reithler, D. Gee, I. ten Have, Tejinder Virdee, E. Buckley, J. R. Batley, I. F. Fensome, P. Flynn, C. Markou, Alain Givernaud, M. Schröder, Sergio Cittolin, A. Norton, K. Morgan, T. Bacon, R. Frey, Francesco Lacava, C. Perault, J. P. Mendiburu, A. Schwartz, Randall Sobie, S. Tether, I. Sacharov, G. Piano Mortari, L. Dobrzynski, F. J. Diez Hedo, Asoke K. Nandi, K. Sumorok, G. Walzel, A. Taurok, I. Siotis, W.J. Haynes, A. Astbury, X. Wu, W. Ruhm, C. Ghesquiere, J. P. Porte, Ritva Kinnunen, S. Li, A. Placci, M. Mohammadi, F. Szoncso, J. Sass, D. J. Holthuizen, G.H. Grayer, B. Aubert, B. Mours, M.J. Corden, S. J. Haywood, Christopher Seez, R. Bonino, Carmen Albajar, D. Samyn, V. Vuillemin, G. Jorat, D. Robinson, S. Centro, G. Fontaine, J. P. Merlo, I. Sheer, I. Wingerter, M.-N. Minard, D. Schinzel, Ehud Duchovni, M. Demoulin, M. Jimack, E. Tscheslog, Daniel J. Smith, Jorma Tuominiemi, G. Maurin, M. Pimiä, E. Eisenhandler, D. Clarke, E. Petrolo, J.P. Vialle, M. Markytan, Teresa Rodrigo, T. C. Meyer, J. Vrana, A. Wildish, H. von der Schmitt, J. D. Dowell, P. Erhard, D. Summers, P. I. P. Kalmus, Felicitas Pauss, M. Ikeda, John A Coughlan, E. Radermacher, O. C. Allkofer, Filippo Ceradini, L. Zanello, G. Bauer, P. Cennini, C. Bacci, B. Van Eijk, Paolo Rossi, Peter Watkins, J. Dorenbosch, A. Savoy-Navarro, T. Axon, Michael Albrow, Veikko Karimäki, Jeffrey Richman, A. Geiser, J. Kroll, W. von Schlippe, T. Markiewicz, C. Zaccardelli, Bruce Denby, Pierluigi Zotto, Charling Tao, J. P. Debrion, P. Catz, Th. Müller, M. Preischl, E. Pietarinen, Daniel Denegri, W. Jank, D. Dau, M. Moricca, J. P. Revol, M. Della Negra, Alessandro Bettini, G. Thompson, S. Geer, A. Honma, A. Diciaccio, D. Linglin, L. Villasenor, M. Yvert, P. Sphicas, I. Kenyon, N. Bains, J. Garvey, M. A. Marquina, S. Levegrün, Y. Giraud-Héraud, T. Wyatt, Margret Fincke-Keeler, C. Cochet, Aleandro Nisati, G. Ciapetti, J. N. Bellinger, N. Ells, J. P. Lees, R. Leuchs, L. Naumann, H. G. Moser, G. Busetto, C. Pigot, A. Bezaguet, C. Rubbia, K. Eggert, J. Rohlf, Richard Keeler, M. Degiorgi, K. Wacker, T. Redelberger, Manfred Krammer, N. Zaganidis, A. Kernan, C.-E. Wulz, Elizabeth Locci, J. P. Laugier, David B. Cline, J. Streets, Claudia J. Stubenrauch, R. Edgecock, A. Gonidec, G. Salvini, T. P. Shah, W. Kienzle, and Stephen Wimpenny
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Top quark, Particle physics, Muon, Large Hadron Collider, Electron, Neutrino, Super Proton Synchrotron, UA1 experiment, Particle Physics - Experiment, Vector boson
Abstract: We present updated results from the UA1 experiment on cross sections times leptonic branching ratios for intermediate vector bosons produced in proton-antiproton collisions at a centre-of-mass energy of 0.630 TeV. We find that σ·B( W → l βn)=0.63±0.04±0.10 nb and σ·B( Z 0 → l + l − =0.071±0.011 nb where l denotes an average of electron and muon channels. An average over all data (electron and muon channels at 0.546 and 0.630 TeV) gives a ratio of R≡σ·( W → l ν)/σ·B( Z 0 → l + l − ) = 9.1 +1.7 −1.2 . Using current theoretical predictions for this quantity, limits are extracted on the number of light neutrino types. Combining UA1 and UA2 data and imposing the bound N ν ⩾3 we find that N ν ⩽5.9 at 90% CL. Constraints on the mass of the top quark are also discussed.
Published: 1987

24. Strangeness and diquark suppression factors in 360 GeV/c pp interactions

Author: P. Herquet, E. P. Kistenev, B. Epp, T. Yamagata, J. L. Bailly, Josef Hrubec, J. B. Singh, I. S. Mittra, Teresa Rodrigo, T. Tsurugai, F. Fontanelli, S. Banerjee, P. Girtler, J. M. Kohl, Yu. M. Ivanyushenkov, U. Trevisan, J. Salicio, G. Zholobov, F. Bruyant, B. Buschbeck, L. Montanet, N. Khalatyan, S. Kitamura, S. N. Ganguli, J-C. Marin, P. Porth, S. Squarcia, S. A. Zotkin, A. Gurtu, V. M. Kubik, Albert Ferrando, G. Neuhofer, R. Raghavan, F. J. Diez-Hedo, H. Dibon, L. A. Tikhonova, S. Matsumoto, W. Bartl, K. Takahashi, I. V. Gorelov, and C. Caso
Subjects: Physics, Nuclear physics, Diquark, Nuclear and High Energy Physics, symbols.namesake, Particle physics, symbols, Feynman diagram, Strangeness, Particle Physics - Experiment
Abstract: From the measurements of the inclusive production ratios between π - , K - and p at Feynman x = 0 in 360 GeV/ c pp interactions and using the predictions of the Lund fragmentation model, we determine the strangeness and diquark suppression factors and find γ s , l = 0.28 ± 0.03 and γ D , l = 0.063 ± 0.011 .
Published: 1987

25. High transverse momentum J/ψ production at the CERN proton-antiproton collider

Author: Felicitas Pauss, M. Ikeda, Filippo Ceradini, J. Kroll, G. Maurin, T. P. Shah, V. Vuillemin, David B. Cline, M. Pimiä, D. Clarke, J. Colas, G. Walzel, A. Norton, G. Piano Mortari, B. Van Eijk, W. Kienzle, W. Ruhm, Emilio Petrolo, P. Nedelec, A. Schwartz, I. Siotis, J. D. Dowell, M. Markytan, E. Tscheslog, Daniel J. Smith, O. C. Allkofer, Tejinder Virdee, W.J. Haynes, I. Zacharov, Hans Reithler, D. Gee, K. Morgan, S. Tether, R. K. Keeler, Jacqueline Batley, Nicolas Zaganidis, Francesco Lacava, Akram Khan, P. Colas, Carmen Albajar, M. Yvert, P. Sphicas, N. Bains, J. Rohlf, T. C. Meyer, C. Markou, A. Placci, C. Perault, K. Eggert, John A Coughlan, E. Radermacher, J. P. Porte, G. Cox, J. P. Merlo, Teresa Rodrigo, P. I. P. Kalmus, T. Axon, Jeffrey Richman, A. Geiser, Kenneth Long, Nicolas Ellis, T. Markiewicz, M.-N. Minard, J. P. Lees, Ritva Kinnunen, P. M. Watkins, Veikko Karimäki, G. Fontaine, B. Aubert, D. Schinzel, X. Wu, K. Sumorok, S. Li, G. Sajot, J. Sass, Charling Tao, R. Leuchs, C. Cochet, D. Samyn, B. Mours, A. Astbury, D. Dau, J. Dorenbosch, A. Savoy-Navarro, M. Della Negra, Ehud Duchovni, J. P. Mendiburu, P. Ghez, Aleandro Nisati, Pierluigi Zotto, M.J. Corden, S. J. Haywood, S. Geer, A. Honma, Jorma Tuominiemi, M. Jimack, E. Eisenhandler, A. Wildish, D. Linglin, G. Ciapetti, J. N. Bellinger, I. Wingerter, Alain Givernaud, D. J. Holthuizen, G.H. Grayer, L. Villasenor, T. Redelberger, E. Buckley, Murrough Landon, W. von Schlippe, H. G. Moser, M. A. Marquina, K. Bos, Anna Teresa Meneguzzo, Dave Charlton, Josef Strauss, D. Robinson, H. von der Schmitt, R. Bonino, F. J. Diez Hedo, G. Busetto, M. Debeer, S. Levegrün, D. Summers, C. Bacci, M. Moricca, J. P. Revol, Alessandro Bettini, J. P. Debrion, Michael Albrow, A. Bezaguet, A. Ferrando, J. Garvey, C. Zaccardelli, Christopher Seez, S. Centro, Bruce Denby, M. Preischl, E. Pietarinen, Daniel Denegri, G. Thompson, J.P. Vialle, P. Catz, Y. Giraud-Héraud, T. Wyatt, L. Naumann, A. van Dijk, M. Demoulin, Christian Ghiglino, I. R. Kenyon, J. A. Wilson, M. Fincke-Keller, C. Pigot, S. Beingessner, L. Dobrzynski, A. Diciaccio, H. Faissner, T. C. Bacon, G. Jorat, P. Erhard, I. F. Fensome, P. Flynn, Randall Sobie, I. Sheer, I. ten Have, C. Rubbia, M. Schröder, Sergio Cittolin, M. Mohammadi, Asoke K. Nandi, G. Bauer, F. Szoncso, P. Cennini, A. Taurok, W. G. Scott, H. Grassmann, D. Kryn, M. Degiorgi, C.-E. Wulz, Elizabeth Locci, J. P. Laugier, R. Edgecock, J. Vrana, L. Zanello, Paolo Rossi, Th. Müller, W. Jank, J. Streets, Claudia J. Stubenrauch, A. Gonidec, G. Salvini, Stephen Wimpenny, K. Wacker, Manfred Krammer, C. Ghesouiere, and A. Kernan
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Proton, Branching fraction, Hadron, law.invention, Nuclear physics, law, Antiproton, Bound state, High Energy Physics::Experiment, Collider, Event (particle physics), Particle Physics - Experiment
Abstract: We have studied high transverse momentum J/ψ production in pp interactions at s=630 GeV. The measured cross section times branching fraction for J/ψ→μ+μ− production with pT⩾5 GeV/c and |y
Published: 1988

26. An impact parameter analysis of proton-proton elastic and inelastic interactions at 360 GeV/c

Author: J. M. Kohli, P. Porth, H. Dibon, L. A. Tikhonova, B. B. Levchenko, F. Bruyant, S. Squarcia, E. P. Kistenev, J. L. Bailly, T. Tsurugai, J.N. Macnaughton, P. Herquet, R. Raghavan, Albert Ferrando, N. S. Khalatyan, U. Trevisan, Josef Hrubec, G. Neuhofer, Yu. Ivanyushenkov, F. Fontanelli, B. Buschbeck, C. Caso, G. Zholobov, Y. Iga, F. J. Diez-Hedo, J. Salicio, A. Ohta, D. Kuhn, K. Rasner, R. Hamatsu, V. M. Kubik, S. Banerjee, J. B. Singh, Yu. A. Golubkov, L. Montanet, G. Pinter, Teresa Rodrigo, S. Kitamura, M. Yu. Bogoljubski, and K. Takahashi
Subjects: Physics, Elastic scattering, Physics and Astronomy (miscellaneous), Proton, Nuclear Theory, Hadron, Inelastic collision, Elementary particle, Inelastic scattering, Baryon, Nuclear physics, Nuclear cross section, Atomic physics, Nuclear Experiment, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: 360 GeV/c proton-proton elastic scattering data obtained at the European Hybrid Spectrometer (EHS) are presented. The differential cross sections of elastic and inelasticpp-interactions are studied as a function of the impact parameter. The results are compared to those obtained at other energies. They are interpreted in the framework of a simple geometrical Monte-Carlo model of inelastic collisions considering protons as composite particles having a definite effective radius with valence quarks inside. The model calculations indicate an increase of the effective radii both of protons and of valence quarks and an increase of the proton opacity with increasing energy. Using this model a description of the overlap function for the total cross section is obtained. A mechanism involving interactions of coloured quarks is proposed leading to a splitting of the overlap function for the total cross section into elastic, inelastic and inelastic diffraction components.
Published: 1987

27. InclusiveK 's and∑ 's production in 360 GeV/cpp interactions using the European hybrid spectrometer

Author: W. Bartl, B. Buschbeck, P. Porth, S. A. Zotkin, V. Khalatyan, Josef Hrubec, F. Fontanelli, J. L. Bailly, V. Stopchenko, S. Squarcia, F. J. Diez-Hedo, H. Dibon, A. Gurtu, T. Tsurugai, J-C. Marin, B. Epp, J. M. Kohli, S. Matsumoto, P. Herquet, P. K. Malhotra, J.N. Macnaughton, Tariq Aziz, E. P. Kistenev, U. Trevisan, Albert Ferrando, J. B. Singh, Teresa Rodrigo, I. S. Mittra, J. Salicio, G. Neuhofer, S. Kitamura, D. Kuhn, L. Montanet, T. Yamagata, F. Bruyant, S. N. Ganguli, S. Banerjee, G. Zholobov, K. Takahashi, I. V. Gorelov, and C. Caso
Subjects: Nuclear physics, Physics, Baryon, Particle acceleration, Particle physics, Physics and Astronomy (miscellaneous), Meson, Spectrometer, Transverse momentum, Elementary particle, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: We have studied the inclusive production of strange meson and baryon resonances in 360 GeV/cpp interactions. Cross sections forK*+(892) andK*−(892) are estimated to be 4.42±0.62 mb and 2.54±0.47 mb respectively and those for∑+(1385) and∑−(1385) are 0.67±0.11 mb and 0.26±0.07 mb respectively. Longitudinal and transverse momentum distributions forK*(892) and Σ(1385) are presented, as well as for their decay productsK0 and Λ. An estimation is given on theK*(1430) and∑*(1915) productions.
Published: 1986

28. Study of heavy flavour production in events with a muon accompanied by jet(s) at the CERN proton-antiproton collider

Author: Alessandro Bettini, T. Bacon, D. Samyn, T. Redelberger, R. K. Keeler, G. Thompson, G. Cox, G. Walzel, Ehud Duchovni, W. Ruhm, Emilio Petrolo, O. C. Allkofer, A. Schwartz, Ritva Kinnunen, M. Jimack, J. Rohlf, Kenneth Long, I. Siotis, Hans Reithler, D. Gee, David B. Cline, G. Busetto, A. Taurok, Nicolas Zaganidis, W.J. Haynes, M. Yvert, P. Sphicas, S. Li, B. Mours, M.J. Corden, S. J. Haywood, N. Bains, A. Placci, K. Eggert, J. P. Lees, P. Nedelec, Akram Khan, P. Colas, K. Morgan, E. Tscheslog, I. Wingerter, S. Tether, C. Markou, D. J. Holthuizen, G. Sajot, G.H. Grayer, I. ten Have, Margret Fincke-Keeler, C. Bacci, M. Markytan, Carmen Albajar, D. Summers, D. Linglin, L. Villasenor, Daniel J. Smith, Teresa Rodrigo, J. P. Merlo, J. P. Mendiburu, M.-N. Minard, P. I. P. Kalmus, J. P. Porte, C. Cochet, P. Cennini, Aleandro Nisati, A. Kernan, B. Aubert, M. A. Marquina, D. Schinzel, D. Robinson, G. Ciapetti, J. P. de Brion, P. Watkims, J. Sass, Nicolas Ellis, J. N. Bellinger, J. Dorenbosch, Murrough Landon, X. Wu, H. G. Moser, W. G. Scott, J. P. Revol, S. Centro, H. Faissner, A. Savoy-Navarro, Tejinder Virdee, A. Wildish, R. Leuchs, S. Levegrün, B. Van Eijk, A. van Dijk, Christopher Seez, Anna Teresa Meneguzzo, M. Debeer, J. R. Batley, I. F. Fensome, P. Flynn, Francesco Lacava, C. Perault, Dave Charlton, S. Beingessner, Felicitas Pauss, M. Ikeda, H. Grassmann, D. Kryn, M. Demoulin, Filippo Ceradini, K. Wacker, P. Ghez, V. Vuillemin, A. Bezaguet, M. Moricca, Manfred Krammer, J. Colas, Veikko Karimäki, J. Kroll, P. Rossi, Randall Sobie, I. R. Kenyon, Christian Ghiglino, C. Rubbia, A. Ferrando, Josef Strauss, Alain Givernaud, I. Zacharov, D. Dau, P. Erhard, Jorma Tuominiemi, G. Bauer, A. Norton, R. Edgecock, J. Ransdell, M. Mohammadi, Y. Giraud-Héraud, F. J. Diez Hedo, Pierluigi Zotto, G. Piano Mortari, M. Degiorgi, T. Wyatt, J. Garvey, L. Dobrzynski, J. Vrana, H. von der Schmitt, Michael Albrow, L. Naumann, A. Diciaccio, C. Pigot, G. Jorat, M. Preischl, E. Pietarinen, Daniel Denegri, K. Sumorok, L. Zanello, I. Sheer, C. Ghesquiere, C.-E. Wulz, Elizabeth Locci, T. C. Meyer, G. Maurin, T. Axon, M. Pimiä, Jeffrey Richman, D. Clarke, J. P. Laugier, E. Buckley, J. D. Dowell, A. Geiser, T. Markiewicz, M. Schröder, Sergio Cittolin, John A Coughlan, Th. Müller, E. Radermacher, W. Jank, Charling Tao, A. Astbury, M. Della Negra, Asoke K. Nandi, S. Geer, F. Szoncso, A. Honma, R. Bonino, J.P. Vialle, W. von Schlippe, C. Zaccardelli, Bruce Denby, P. Catz, K. Bos, G. Fontaine, E. Eisenhandler, Stephen Wimpenny, J. Streets, Claudia J. Stubenrauch, A. Gonidec, G. Salvini, T. P. Shah, and W. Kienzle
Subjects: Quantum chromodynamics, Physics, Quark, Particle physics, Muon, Large Hadron Collider, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Jet (particle physics), 01 natural sciences, law.invention, Nuclear physics, law, Antiproton, 0103 physical sciences, High Energy Physics::Experiment, Charm (quantum number), Nuclear Experiment, 010306 general physics, Collider, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: We present a study of heavy flavour (charm and beauty) production using data collected with the UA1 detector at the CERN Proton-Antiproton collider at a centre-of-mass energy of 630 GeV for an integrated luminosity of 556 nb−1. This follows our earlier study ofb $$\bar b$$ andc $$\bar c$$ production in dimuon events and the evidence for mixing betweenB 0 and $$\bar B^0 $$ states. Properties of an inclusive sample of events containing a muon withp T >6 GeV/c are compared with QCD predictions for heavy flavour production, using the ISAJET Monte Carlo program. The predicted largep T muon yield from heavy flavour production and decay agrees with the data to within 30%. For events with a muon ofp T >10 GeV/c and at least one jet withE T >10 GeV, we measure the ratio charm/(charm+beauty) to be (24±8±9)%. We also show that the correlations observed between the two heavy quark jets expected by flavour conservation are consistent with the mixture of lowest and higher order QCD processes. We study in detail the topological and kinematic properties of a subsample of events containing a highp T muon and one or more jets. The good agreement of the theoretical predictions with our data in a region dominated by the production of charm and beauty shows that one of the main background sources to a new heavy quark signature is well understood.
Published: 1988

29. Influence of the electric field on compensation in a uranium/tetramethylpentane hadronic calorimeter

Author: G. Maurin, C. Rubbia, Christopher Seez, A. Tusi, Maria Isabel Josa, Claudia J. Stubenrauch, A. Gonidec, K. Morgan, J.M Salicio, A. DiCiaccio, Stefano Veneziano, A. Caner, M. Lindgren, F. J. Diez-Hedo, E. Torrente-Lujan, Manfred Krammer, E. Radermacher, O. Ullaland, D. Drijard, Emilio Petrolo, L. Dumps, L. Naumann, Tejinder Virdee, Francesco Lacava, A. Bezaguet, D. Schinzel, F. Cavanna, H. Evans, R. Munoz, C. Bacci, V. Vuillemin, D. Bloess, Teresa Rodrigo, L. Pontecorvo, A. Fernando, Dave Robinson, A. Placci, Alain Givernaud, and C. Markou
Subjects: Physics, Nuclear and High Energy Physics, Range (particle radiation), Calorimeter (particle physics), Hadron, Charge (physics), Electron, Momentum, Nuclear physics, Pion, Electric field, High Energy Physics::Experiment, Detectors and Experimental Techniques, Nuclear Experiment, Instrumentation
Abstract: A uranium tetramethylpentane hadronic calorimeter has been tested using electrons and pions of 7 GeV/ c momentum with electric fields varying from 0.8 to 16.0 kV/cm; the e/π charge collection ratio has been measured as a function of the electric field within this range. It is observed that the e/π ratio can be tuned acting on the electric field without spoiling the energy resolution for electrons. At the same time the energy resolution for pions is improved. The effect was cross-checked using a second module and 40 GeV/ c electron and pion beams.

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29 results on '"F. J. Diez Hedo"'

1. Measurement of B0−0 mixing at the CERN Spp̄S collider

2. Intermittency studies in p collisions at

3. Experimental limit on the decay W±→π±γ at the cern proton-antiproton collider

4. A study of the general characteristics of proton-antiproton collisions at √s=0.2 to 0.9 TeV

5. Search for new heavy quarks in proton-antiproton collisions at $$\sqrt s = 0.63 TeV$$

6. First observation of the beauty baryon Λb in the decay channel Λb→J/ψΛ at the CERN proton-antiproton collider

7. BEAUTY PRODUCTION AT THE CERN PP-BAR COLLIDER

8. Measurement of the ratio R≡σWBr(W→μν)/σzBr(Z→μμ) and ΓWtot at the CERN proton-antiproton collider

9. Limits On T-quark Decay Into Charged Higgs From A Direct Search At the Cern Ppbar Collider

10. A SEARCH FOR RARE B-MESON DECAYS AT THE CERN SPPBARS COLLIDER

11. J/ψ and ψ′ production at the CERN p̄p collider

12. Performance of a uranium/tetramethylpentane electromagnetic and hadronic calorimeter

13. A study of the D∗ content of jets at the CERN p collider

14. Studies of intermediate vector boson production and decay in UA1 at the CERN proton-antiproton collider

15. Bose-Einstein correlations in pp interactions at √s=0.2 to 0.9 TeV

16. Two-jet mass distributions at the CERN proton-antiproton collider

17. Measurement of the bottom quark production cross section in proton-antiproton collisions at √s = 0.63 TeV

18. Events with large missing transverse energy at the CERN collider: III. Mass limits on supersymmetric particles

19. Test of a quark-diquark fragmentation mechanism in proton-proton interactions at 360 GeV/c

20. Analysis of transverse momentum distributions for $pp$ interactions at 360 GeV/c in the framework of a quark-diquark fragmentation model

21. Inclusive pion production in 360 GeV/cpp interactions

22. Search For New Heavy Quarks At the Cern Proton-antiproton Collider

23. Intermediate vector boson cross sections at the CERN super proton synchrotron collider and the number of neutrino types

24. Strangeness and diquark suppression factors in 360 GeV/c pp interactions

25. High transverse momentum J/ψ production at the CERN proton-antiproton collider

26. An impact parameter analysis of proton-proton elastic and inelastic interactions at 360 GeV/c

27. InclusiveK 's and∑ 's production in 360 GeV/cpp interactions using the European hybrid spectrometer

28. Study of heavy flavour production in events with a muon accompanied by jet(s) at the CERN proton-antiproton collider

29. Influence of the electric field on compensation in a uranium/tetramethylpentane hadronic calorimeter

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29 results on '"F. J. Diez Hedo"'

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