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15 results on '"J. P. Porte"'

1. Measurement of αs from b production at the cern p collider

Author

P. I. P. Kalmus, J. Dorenbosch, J. Gronberg, M. Vargas, Matthias Schröder, H. Faissner, B. Gonzalez, S. Lammel, E. Pietarinen, Daniel Denegri, H. Teykal, K. Ankoviak, R. Priem, David B. Cline, R. Prosi, Christopher Seez, D. Schinzel, M. P. J. Landon, G. Walzel, Carmen Albajar, H. Wagner, S. Tether, L. Fortson, Nicolas Ellis, A. Norton, E. Eisenhandler, K. Eggert, M. Markytan, H. Castilla-Valdez, S. Levegrün, J. P. Revol, W. von Schlippe, Ritva Kinnunen, Alain Givernaud, T.I. Meyer, L. Taylor, Jorma Tuominiemi, J. A. Caughlan, D. Samyn, S. Otwinowski, P. Sphicas, A. Moulin, I. R. Kenyon, Achim Geiser, Peter Lipa, P. Cennini, T.P. Shah, B. Buschbeck, G. Maurin, Andreas Morsch, W. van de Guchte, Y. Lemoigne, W. Jank, M. Della Negra, C.-E. Wulz, H. Evans, M. Rauschkolb, C. D. Buchanan, H. Tuchscherer, V. Vuillemin, Jean-Pierre Merlo, A. Bezaguet, Tejinder Virdee, S. Bartha, C. Rubbia, G. Bauer, D. H. Stork, C. Markou, Hans Reithler, J. Garvey, A. Gonidec, A. van Dijk, J. D. Dowell, I. F. Fensome, E. F. Clayton, K. Wacker, M. Mohammadi, G. Jorat, Sergio Cittolin, Manfred Krammer, C.H. Tan, Konstanty Sumorok, A. Placci, M. Pimiä, Dave Robinson, C. Daum, E. Radermacher, J. P. Porte, F. Szoncso, R. Schleichert, D. J. Holthuizen, K. Bos, M. Demoulin, Veikko Karimäki, D. Dau, Pierluigi Zotto, H. Dibon, G. Thompson, G. Pancheri, A. Böhrer, Steve McMahon, Anton Taurok, and T. Moers

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Hadron, law.invention, Renormalization, Factorization, law, Quantum mechanics, Strong coupling, Production (computer science), Collider
Abstract

The UA1 Collaboration has recently improved its measurement of the beauty production cross-section by including explicit measurements of b b correlations. Using these data we have determined the strong coupling constant α s . The comparison of the measured cross-section for 2-body final states with O ( α s 3 ) QCD predictions yields a measurement of α s (20 GeV) = 0.145 −0.010 exp −0.016 th +0.012 +0.013 , corresponding to α s ( M z ) = 0.113 −0.006 exp −0.009 th +0.007 +0.008 . This is the first theoretically well-defined measurement of α s from a purely hadronic production process. Evaluating α s from cross-sections at different Q 2 -values we find that the running of α s is needed for internal consistency of the UA1 data.

Published
1996

2. 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

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. Observation of muonic ZO-decay at the p̄p collider

Author

B. Sadoulet, J. P. Lees, A. Astbury, Nicolas Ellis, G. Maurin, J. Timmer, C.-E. Wulz, Elizabeth Locci, J. P. Laugier, T. P. Shah, I. Sheer, J.P. Vialle, W. R. Gibson, M. Yvert, P. I. P. Kalmus, P. Cennini, G. Sajot, Michel Spiro, Felicitas Pauss, Filippo Ceradini, J. Vrana, W. G. Scott, D. Linglin, C. Bacci, P. Catz, A. Bezaguet, D. Pitman, A. Savoy-Navarro, B. Van Eijk, Alain Givernaud, G.T.J. Arnison, J. Colas, D. J. Holthuizen, G.H. Grayer, David J. Smith, T. J. V. Bowcock, L. Dobrzynski, M. Loret, A. Diciaccio, M. Corden, T. Hansl-Kozanecka, A. Orkin-Lecourtois, O. C. Allkofer, Milene Calvetti, G. Fontaine, A. Norton, M.-N. Minard, D. Dallman, D. Schinzel, J. Streets, R. J. Homer, E. Eisenhandler, J. P. Mendiburu, C. Cochet, S. Centro, E. Strauss, G. Piano Mortari, Ritva Kinnunen, Veikko Karimäki, J. Sass, M. Pimiä, P. M. Watkins, M. Demoulin, R. Frühwirth, J. Rohlf, R. Frey, Francesco Lacava, J. Garvey, D. Dau, K. Eggert, C. Roberts, Paul Kyberd, L. Paoluzi, J. D. Dowell, H. F. Hoffmann, W. Jorat, L.O. Hertzberger, K.L. Giboni, R. K. Bock, Jorma Tuominiemi, Paolo Rossi, C. Ghesquiere, Sergio Cittolin, E. Tscheslog, Michael Rijssenbeek, G. Thompson, C. Rubbia, J. P. Revol, J. Ransdell, M. Fincke, G. Bauer, L. Naumann, F. Muller, Asoke K. Nandi, H. D. Wahl, V. Vuillemin, David B. Cline, J. S. Wilson, F. Szoncso, W. Jank, Daniel Denegri, Hans Reithler, H. Lehmann, Thomas W. Markiewicz, J. Rich, A. Placci, E. Radermacher, J. P. Porte, D. DiBitonto, A. Gonidec, Dirk L. Hoffmann, A. Kernan, M. Debeer, T. J. McMahon, P. Flynn, W. Kozanecki, H. Faissner, M. Mohammadi, I. R. Kenyon, P. Erhard, B. Aubert, D. Kryn, R. Leuchs, Richard Keeler, M. Moricca, Konstanty Sumorok, W.J. Haynes, A. Lévêque, K. Morgan, G. Salvini, E. Pietarinen, Philippe Ghez, Y. Giraud-Héraud, Charling Tao, M. Della Negra, S. Geer, and A. Honma

Subjects
Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Particle decay, Pair production, Muon, Branching fraction, Hadron, Elementary particle, Lepton
Abstract

We report the observation of five muonic Z 0 decays. The mass and cross section times branching ratio is consistent with the previous measurements of Z 0 →e + e − . Three of the muonic decays have unexpected features. One event is of the type Z 0 →μ + μ − γ. Two of the Z 0 →μ + μ − decays are accommpanied by several (>4) energetic ( E T > 10 GeV) jets which are difficult to explain within the framework of standard QCD corrections.

Published
1984

5. 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

6. 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

7. 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

8. 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

9. Inclusive φ production in K+p interactions at 70 GeV/c

Author

J. F. Baland, E. A. De Wolf, J. Beaufays, F. Fontanelli, C. Milstène, H. Drevermann, L. Gatignon, J. Hanton, Yves Goldschmidt-Clermont, M. Spyropoulou-Stassinaki, M. Barth, D. J. Schotanus, C. De Clercq, V. M. Ronjin, R. Monge, U. Trevisan, V. A. Uvarov, Fernand Grard, Jacques Lemonne, I. A. Gritsaenko, Y. L. Petrovikh, Daniel Johnson, A. Stergiou, J. J. Dumont, P. A. van der Poel, P. Theocharopoulos, R. Contri, R. T. Ross, Alexander Fenyuk, S. Squarcia, R. T. Van de Walle, C. Caso, J. P. Porte, V. I. Nikolaenko, P. V. Chiliapnikov, and O. V. Kasian

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Meson production, Valence (chemistry), High Energy Physics::Lattice, High Energy Physics::Phenomenology, Nuclear Theory, Nuclear physics, Fragmentation (mass spectrometry), High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment, Recombination
Abstract

We present results on inclusive φ meson production in K + p interactions at 70 GeV/ c in the kaon fragmentation x >0.2 region. Comparison with other data on φ meson production in K ± and p induced reactions provides evidence that the strange valence-quark fragmentation or recombination processes play the dominant role in the K ± → φ transitions. Arguments are presented that the kaon valence strange s -quark carries a much higher momentum fraction than the u-quark. Evidence for the previously observed narrow φπ + state at mass ∼2.1 GeV is discussed.

Published
1982

10. Experimental observation of events with large missing transverse energy accompanied by a jet or a photon (S) in p collisions at

Author

A. Astbury, B. Aubert, C.-E. Wulz, Elizabeth Locci, P. Ghez, A. Orkin-Lecourtois, J. P. Laugier, David B. Cline, W. G. Scott, A. Savoy-Navarro, J. Ransdell, K. Eggert, G. Thompson, J.P. Vialle, David J. Smith, M. Debeer, T. J. McMahon, Josef Strauss, C. Bacci, H. D. Wahl, J. Colas, M.-N. Minard, P. Catz, A. Bezaguet, I. R. Kenyon, H. Lehmann, O. C. Allkofer, D. Dallman, D. Schinzel, J. Streets, P. Cennini, I. Sheer, P. Erhard, Y. Giraud-Héraud, Hans Reithler, G.T.J. Arnison, Daniel Denegri, M. Corden, M. Loret, Felicitas Pauss, Filippo Ceradini, Thomas W. Markiewicz, Ritva Kinnunen, J. Rich, E. Radermacher, A. Norton, Alain Givernaud, J. P. Revol, J. Rohlf, W.J. Haynes, M. Pimiä, J. P. Porte, P. M. Watkins, M. Yvert, L. Dobrzynski, D. DiBitonto, R. Frühwirth, A. Diciaccio, J. Timmer, G. Piano Mortari, Veikko Karimäki, A. Gonidec, G. Jorat, A. Lévêque, H. F. Hoffmann, D. Dau, R. J. Homer, L. Paoluzi, C. Cochet, B. Sadoulet, D. J. Holthuizen, Charling Tao, G.H. Grayer, G. Fontaine, J. Garvey, A. Placci, C. Ghesquiere, J. D. Dowell, E. Pietarinen, D. Pitman, E. Eisenhandler, C. Rubbia, Sergio Cittolin, G. Maurin, R. K. Bock, M. Della Negra, B. Van Eijk, S. Geer, Jorma Tuominiemi, A. Honma, G. Bauer, E. Tscheslog, Nicolas Ellis, R. Leuchs, Richard Keeler, J. P. Lees, S. Centro, A. Kernan, Asoke K. Nandi, Paul Kyberd, F. Szoncso, M. Demoulin, P. Flynn, T. J. V. Bowcock, M. Fincke, W. Kozanecki, M. Moricca, Konstanty Sumorok, V. Vuillemin, H. Faissner, M. Mohammadi, Dirk L. Hoffmann, T. Hansl-Kozanecka, J. P. Mendiburu, P.I.P. Kalmus, M. Calvetti, T.P. Shah, R. Frey, Francesco Lacava, L.O. Hertzberger, J. Vrana, D. Kryn, D. Linglin, Paolo Rossi, Michael Rijssenbeek, J. S. Wilson, W. Jank, K. Morgan, G. Salvini, C. Roberts, L. Naumann, F. Muller, J. Sass, G. Sajot, and W.R. Gibson

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Transverse plane, Jet (fluid), Particle physics, Photon, Hadron, High Energy Physics::Experiment, Nuclear Experiment, Energy (signal processing), Standard Model
Abstract

We report the observation of five events in which a missing transverse energy larger than 40 GeV is associated with a narrow hadronic jet and of two similar events with a neutral electromagnetic cluster (either one or more closely spaced photons). We cannot find an explanation for such events in terms of backgrounds or within the expectations of the Standard Model.

Published
1984

11. Direct photon production at the CERN proton-antiproton collider

Author

C. Albajar, M.G. Albrow, O.C. Allkofer, A. Astbury, B. Aubert, T. Axon, C. Bacci, T. Bacon, N. Bains, J.R. Batley, G. Bauer, S. Beingessner, A. Bettini, A. Bezaguet, R. Bonino, K. Bos, E. Buckley, G. Busetto, P. Catz, P. Cennini, S. Centro, F. Ceradini, D.G. Charlton, G. Ciapetti, S. Cittolin, D. Clarke, D. Cline, C. Cochet, J. Colas, P. Colas, M. Corden, J.A. Coughlan, G. Cox, D. Dau, J.P. Debrion, M. Degiorgi, M.Della Negra, M. Demoulin, D. Denegri, A. Diciaccio, F.J. Diez Hedo, L. Dobrzynski, J. Dorenbosch, J.D. Dowell, E. Duchovni, K. Eggert, E. Eisenhandler, N. Ellis, P. Erhard, H. Faissner, I.F. Fensome, A. Ferrando, M. Fincke-Keeler, P. Flynn, G. Fontaine, J. Garvey, D. Gee, S. Geer, A. Geiser, C. Ghesquiere, P. Ghez, C. Ghiglino, Y. Giraud-Heraud, A. Givernaud, A. Gonidec, H. Grassmann, J.M. Gregory, W. Haynes, S.J. Haywood, D.J. Holthuizen, M. Ikeda, W. Jank, M. Jimack, G. Jorat, D. Joyce, P.I.P. Kalmus, V. Karimaki, R. Keeler, I. Kenyon, A. Kernan, A. Khan, W. Kienzle, R. Kinnunen, M. Krammer, J. Kroll, D. Kryn, F. Lacava, M. Landon, J.P. Lees, R. Leuchs, S. Levegrün, S. Li, M. Lindgren, D. Linglin, P. Lipa, E. Locci, T. Markiewicz, C. Markou, M. Markytan, M.A. Marquina, G. Maurin, J.-P. Mendiburu, A. Meneguzzo, J.P. Merlo, T. Meyer, M.-N. Minard, M. Mohammadi, K. Morgan, H.-G. Moser, A. Nisati, B. Mours, Th. Muller, L. Naumann, P. Nedelec, A. Norton, F. Pauss, C. Perault, E. Petrolo, G. Piano Mortari, E. Pietarinen, C. Pigot, M. Pimiä, A. Placci, J.-P. Porte, M. Preischl, A. Radermacher, T. Redelberger, H. Reithler, J.-P. Revol, D. Robinson, T. Rodrigo, J. Rohlf, C. Rubbia, G. Sajot, G. Salvini, J. Sass, D. Samyn, D. Schinzel, M. Schröder, A. Schwartz, W. Scott, C. Seez, T.P. Shah, I. Sheer, I. Siotis, D. Smith, R. Sobie, P. Sphicas, J. Strauss, J. Streets, C. Stubenrauch, D. Summers, K. Sumorok, F. Szoncso, C. Tao, A. Taurok, I. Ten Have, S. Tether, G. Thompson, E. Tscheslog, J. Tuominiemi, W. Van De Guchte, A. Van Eijk, B. Van Eijk, J.P. Vialle, L. Villasenor, T.S. Virdee, W. Von Schlippe, J. Vrana, V. Vuillemin, K. Wacker, G. Walzel, A. Wildish, I. Wingerter, S.J. Wimpenny, X. Wu, C.-E. Wulz, T. Wyatt, M. Yvert, C. Zaccardelli, I. Zacharov, N. Zaganidis, L. Zanello, and P. Zotto

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Photon, Large Hadron Collider, Proton, Scattering process, UA1 experiment, law.invention, Nuclear physics, law, Antiproton, High Energy Physics::Experiment, Nuclear Experiment, Collider, Particle Physics - Experiment
Abstract

Isolated photons, produced directly by a scattering process, have been observed in the UA1 experiment at the CERN p p collider at centre-of-mass energies √=546 GeV and √=630 GeV . Single and double photon differential cross sections have been determined and found to be consistent with the expectations of QCD.

Published
1988

12. Comparison of three-jet and two-jet cross sections in pp̄ collisions at the CERN SPS pp̄ collider

Author

M. Loret, J. Colas, Philippe Ghez, J. Dorenbosch, A. Savoy-Navarro, D. Kryn, T. J. V. Bowcock, P. Erhard, P. Cennini, H. Faissner, Josef Strauss, A. Di Ciaccio, L. Dobrzynski, D. Linglin, Y. Giraud-Héraud, W.J. Haynes, B. Aubert, A. Lévêque, T. Wyatt, G. Bauer, P. Flynn, W. G. Scott, E. Radermacher, Hans Reithler, G.T.J. Arnison, T. Markiewicz, G. Jorat, G. Fontaine, I. Sheer, A. Norton, A. Orkin-Lecourtois, Charling Tao, G. Thompson, Milene Calvetti, E. Eisenhandler, D. J. Holthuizen, G.H. Grayer, J. Sass, R. Frey, Francesco Lacava, L. Paoluzi, G. Sajot, L.O. Hertzberger, E. Tscheslog, K.L. Giboni, M. Moricca, C. Bacci, M. Della Negra, Daniel J. Smith, A. Bezaguet, K. Morgan, Ritva Kinnunen, P. M. Watkins, C. Roberts, D. Pitman, S. Geer, A. Honma, M. Mohammadi, P. I. P. Kalmus, S. Centro, Sergio Cittolin, Veikko Karimäki, W. Kozanecki, M. Yvert, A. Placci, Paolo Rossi, M.J. Corden, D. Dau, M. Demoulin, R. Sobie, Michael Rijssenbeek, J. Streets, D. Hoffmann, M.-N. Minard, G. Maurin, J. Garvey, Alain Givernaud, T. Redelberger, G. Salvini, E. Buckley, P. Catz, D. Dallman, T. Hansl-Kozanecka, Asoke K. Nandi, J. P. Revol, R. Frühwirth, F. Szoncso, J. P. Porte, D. Schinzel, Jorma Tuominiemi, W. Jank, C. Cochet, L. Naumann, W. R. Gibson, W. Guryn, G. Ciapetti, A. Kernan, B. Sadoulet, J. D. Dowell, C. Rubbia, J. Vrana, J. P. Lees, L. Zanello, R. K. Bock, R. Leuchs, J. Timmer, J. P. Mendiburu, O. C. Allkofer, Nicolas Ellis, T.P. Shah, J. Rohlf, C. Ghesquiere, H. F. Hoffmann, E. Pietarinen, Daniel Denegri, J. Rich, H. D. Wahl, H. Lehmann, V. Vuillemin, Felicitas Pauss, Filippo Ceradini, R. J. Homer, David B. Cline, A. Astbury, D. DiBitonto, A. Gonidec, M. Debeer, T. J. McMahon, I. R. Kenyon, J. A. Wilson, J.P. Vialle, Richard Keeler, R. Edgecock, J. Ransdell, R. Batley, Konstanty Sumorok, M. Pimiä, C.-E. Wulz, Elizabeth Locci, J. P. Laugier, K. Eggert, G. Piano Mortari, Paul Kyberd, R. Raja, M. Fincke, and B. Van Eijk

Subjects
Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Astrophysics::High Energy Astrophysical Phenomena, Strong interaction, Bremsstrahlung, Dalitz plot, Jet (particle physics), Super Proton Synchrotron, law.invention, Nuclear physics, law, High Energy Physics::Experiment, Collider
Abstract

Results are presented on two-jet and three-jet cross sections, measured in the UA1 experiment at the CERN Super Proton Synchrotron (SPS) pp Collider, at the highest available subprocess cms energies ( s >150 GeV ). Precise measurements of the two-jet angular distribution are consistent with previous results but show significant scale-breaking effects. The three-jet Dalitz plot and the three-jet angular distributions show evidence for final- and initial-state bremsstrahlung processes, in agreement with the leading-order QCD predictions. A comparison of the yield of wide-angle three-jet events with the yield of two-jet events at smaller scattering angles gives for the strong interaction coupling constant: α s ( K 3J K 2J )=0.16±0.02±0.03 at Q2≈4000 GeV2, where the factor K 3J K 2J may plausibly be assumed to be close to unity.

Published
1985

13. Intermediate-mass dimuon events at the CERN p collider at √s = 540 GeV

Author

H. D. Wahl, E. Tscheslog, Daniel J. Smith, D. Kryn, J. P. Mendiburu, J. P. Revol, W. Kozanecki, L. Naumann, F. Muller, P. Cennini, P. I. P. Kalmus, H. Lehmann, B. Sadoulet, Richard Keeler, D. J. Holthuizen, M. Loret, G.H. Grayer, T. J. McMahon, W. G. Scott, C. Ghesquiere, A. Savoy-Navarro, Josef Strauss, G. Fontaine, D. Linglin, Nicolas Ellis, E. Radermacher, S. Centro, G. Maurin, Philippe Ghez, Konstanty Sumorok, Paul Kyberd, A. Norton, E. Eisenhandler, J. Garvey, W. R. Gibson, M. Demoulin, J. D. Dowell, M. Pimiä, E. Pietarinen, I. R. Kenyon, J. A. Wilson, Daniel Denegri, J. P. Lees, Y. Giraud-Héraud, R. Edgecock, J. Ransdell, Alain Givernaud, J. Sass, R. K. Bock, R. Frey, Francesco Lacava, J. Rich, T. J. V. Bowcock, R. Leuchs, T. Markiewicz, L.O. Hertzberger, K.L. Giboni, R. Frühwirth, Sergio Cittolin, G. Bauer, G.T.J. Arnison, A. Orkin-Lecourtois, Charling Tao, K. Eggert, David B. Cline, Asoke K. Nandi, P. Catz, M. Moricca, M.-N. Minard, D. Dallman, J. Streets, M. Della Negra, D. Schinzel, S. Geer, A. Honma, A. Astbury, R. Raja, F. Szoncso, Ritva Kinnunen, L. Dobrzynski, Felicitas Pauss, Filippo Ceradini, G. Salvini, M. Fincke, A. Bezaguet, P. M. Watkins, W.J. Haynes, A. Kernan, V. Vuillemin, P. Erhard, J.P. Vialle, M. Calvetti, L. Paoluzi, T.P. Shah, Veikko Karimäki, M.J. Corden, T. Hansl-Kozanecka, G. Sajot, M. Yvert, J. Timmer, R. J. Homer, C.-E. Wulz, Elizabeth Locci, Hans Reithler, H. Faissner, D. Hoffmann, D. Dau, A. Lévêque, K. Morgan, D. Pitman, A. Di Ciaccio, B. Aubert, P. Flynn, J. P. Laugier, A. Placci, M. Debber, M. Mohammadi, G. Jorat, J. P. Porte, G. Thompson, B. Van Eijk, W. Guryn, C. Cochet, G. Ciapetti, Jorma Tuominiemi, J. Colas, I. Sheer, G. Piano Mortari, D. DiBitonto, A. Gonidec, C. Bacci, O. C. Allkofer, J. Rohlf, H. F. Hoffmann, T. Redelberger, Paolo Rossi, Michael Rijssenbeek, W. Jank, C. Rubbia, J. Vrana, L. Zanello, and C. Roberts

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Muon, Large Hadron Collider, Physics::Instrumentation and Detectors, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment
Abstract

We report the observation of 21 dimuon events at the CERN p p Collider with the UA1 detector. The events range in invariant dimuon mass from 2 to 22 GeV / c 2 . The properties of these events are given. The bulk of the events are consistent with heavy-flavour production (mainly b b ) with a few candidates for Drell-Yan production. There remain a few events which are difficult to interpret in terms of these processes, in particular two events with isolated, like-sign muons.

Published
1985

14. D∗ production in jets at the CERN SPS collider

Author

A. Orkin-Lecourtois, A. Kernan, Daniel Denegri, W. J. Haynes, G.T.J. Arnison, D. DiBitonto, J. Rich, A. Gonidec, R. Frey, Francesco Lacava, David J. Smith, L.O. Hertzberger, A. Savoy-Navarro, Ritva Kinnunen, David B. Cline, A. Placci, M. Pimiä, P. M. Watkins, I. Sheer, J. Sass, K. Reithler, C. Ghesquière, A. Astbury, Alain Givernaud, Veikko Karimäki, Charling Tao, D. Dau, J. P. Revol, L. Dobrzynski, M. Loret, M. Della Negra, D. J. Holthuizen, G.H. Grayer, B. Aubert, H. F. Hoffmann, Jorma Tuominiemi, A. Diciaccio, Dirk L. Hoffmann, G. Thompson, S. Geer, A. Honma, L. Paoluzi, G. Jorat, C. Bacci, B. Sadoulet, S. Centro, P. Flynn, J.P. Vialle, A. Bezaguet, G. Maurin, J. S. Wilson, E. Radermacher, J. P. Porte, W. G. Scott, C.-E. Wulz, W. Kozanecki, M. Demoulin, M. Yvert, Elizabeth Locci, Nicolas Ellis, M. Debeer, T. J. McMahon, H. Faissner, M. Mohammadi, J. P. Laugier, E. Tscheslog, J. Garvey, V. Vuillemin, I. R. Kenyon, Sergio Cittolin, P. Erhard, T. Hansl-Kozanecka, Michel Spiro, O. C. Allkofer, D. Linglin, J. Ransdell, P. Cennini, J. D. Dowell, E. Pietarinen, M. Calvetti, M.-N. Minard, J. P. Mendiburu, D. Dallman, J. P. Lees, R. K. Bock, Asoke K. Nandi, F. Szoncso, D. Schinzel, J. Streets, Y. Giraud-Héraud, T. J. V. Bowcock, C. Cochet, P. Kyberd, R. Frühwirth, J. Rohlf, K. Morgan, P.I.P. Kalmus, G. Salvini, P. Ghez, Josef Strauss, C. Rubbia, G. Bauer, Felicitas Pauss, A. Lévêque, T. P. Shah, R. Leuchs, Richard Keeler, Filippo Ceradini, D. Kryn, M. Moricca, Konstanty Sumorok, R. J. Homer, H. D. Wahl, H. Lehmann, L. Naumann, F. Muller, G. Fontaine, E. Eisenhandler, J. Timmer, P. Catz, J. Colas, M. Corden, A. Norton, G. Piano Mortari, Paolo Rossi, Michael Rijssenbeek, W. Jank, M. Fincke, Thomas W. Markiewicz, D. Pitman, B. Van Eijk, C. Roberts, K. Eggert, J. Vrana, G. Sajot, and W.R. Gibson

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Meson, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, Charged particle, Gluon, law.invention, Nuclear physics, Particle decay, Pion, law, High Energy Physics::Experiment, Nuclear Experiment, Collider
Abstract

We report evidence for the production of the charged D∗ mesons in pp collisions at s = 540 GeV . The search was confined to the charged particle fragments of hadronic jets, which are expected to be predominantly gluon jets in this experiment. The fragmentation function and production rate for D∗ in jets of average transverse momentum of 28 GeV/c are given.

Published
1984

15. Search for oscillations at the CERN proton-antiproton collider

Author

J. Colas, D. Linglin, L. Villasenor, T. Bacon, H. Faissner, J. Vrana, Veikko Karimäki, W. Ruhm, G.T.J. Arnison, J. R. Batley, I. F. Fensome, P. Flynn, Randall Sobie, M. Yvert, P. Sphicas, L. Zanello, A. Norton, N. Bains, Stephen Wimpenny, Pierluigi Zotto, A. Astbury, G. Bauer, J. Dorenbosch, A. Savoy-Navarro, M.-N. Minard, D. Schinzel, M. Mohammadi, E. Pietarinen, Daniel Denegri, G. Piano Mortari, C. Ghesquiere, Ritva Kinnunen, G. Sajot, W.R. Gibson, W. G. Scott, S. Li, B. Mours, D. Pitman, C. Cochet, G. Maurin, J. P. Debrion, H. G. Moser, A. Placci, M.J. Corden, S. J. Haywood, I. Wingerter, Paul Kyberd, Hans Reithler, G. Ciapetti, D. Gee, M. Pimiä, D. Clarke, J. D. Dowell, John A Coughlan, E. Radermacher, R. Edgecock, L. Dobrzynski, Tejinder Virdee, R. Frey, Francesco Lacava, M. Ikeda, J.P. Vialle, A. Schwartz, A. Bezaguet, L. Naumann, C. Perault, Paolo Rossi, M. Debeer, O. C. Allkofer, Felicitas Pauss, A. Diciaccio, M. Markytan, K. Morgan, I. Siotis, C. Pigot, E. Tscheslog, Daniel J. Smith, E. Petrolo, M. Moricca, J. P. Revol, M. Degiorgi, I. Zacharov, D. Pascoli, Filippo Ceradini, John Wilson, T. Meyer, S. Tether, C. Markou, P. I. P. Kalmus, G. Jorat, I. Sheer, W.J. Haynes, T. Axon, Jeffrey Richman, A. Geiser, Christopher Seez, J. Kroll, Alessandro Bettini, Paolo Giacomelli, I. R. Kenyon, G. Thompson, D. Samyn, T. Redelberger, J. Streets, Ehud Duchovni, Michael Albrow, Richard Keeler, G. Fontaine, J. P. Porte, C.-E. Wulz, A. Taurok, Elizabeth Locci, S. Levegrün, M. Jimack, S. Beingessner, Claudia J. Stubenrauch, J. Sass, J. P. Mendiburu, A. Gonidec, J. P. Laugier, G. Salvini, B. Van Eijk, Peter Watkins, G. Busetto, K. Sumorok, Carmen Albajar, L. Gately, E. Eisenhandler, D. Summers, K. Wacker, P. Petta, R. J. Homer, P. Erhard, Th. Müller, David B. Cline, W. Jank, Margret Fincke-Keeler, V. Vuillemin, C. Rubbia, Y. Giraud-Héraud, H. F. Hoffmann, B. Aubert, D. J. Holthuizen, G.H. Grayer, I. ten Have, J. P. Merlo, Manfred Krammer, Anna Teresa Meneguzzo, Dave Charlton, T. Wyatt, T. P. Shah, X. Wu, J. P. Lees, H. D. Wahl, G. Cox, F. Ghio, W. Kienzle, Kenneth Long, D. Robinson, S. Centro, A. Wildish, J. N. Bellinger, T. Markiewicz, N. Zaganidis, Jorma Tuominiemi, M. Demoulin, H. von der Schmitt, Charling Tao, J. Garvey, D. Dau, M. Della Negra, R. Leuchs, J. Rohlf, S. Geer, A. Honma, P. Ghez, P. Cennini, C. Bacci, Josef Strauss, K. Eggert, R. Frühwirth, G. Bunce, P. Nedelec, Akram Khan, P. Colas, Nicolas Ellis, H. Grassmann, D. Kryn, Alain Givernaud, A. Kernan, K. Bos, E. Buckley, Sergio Cittolin, Asoke K. Nandi, F. Szoncso, W. von Schlippe, C. Zaccardelli, Bruce Denby, and P. Catz

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Large Hadron Collider, Proton, Electric charge, law.invention, Nuclear physics, law, Antiproton, Charm (quantum number), Collider, Mixing (physics)
Abstract

We report on a search for B0↔B¯0 oscillations (mixing) using events with two identified muons from data collected at the CERN p¯p collider. In the absence of B0↔B¯0 oscillations, dimuons coming directly from decays of beauty-antibeauty paris must have opposite signs. Like-sign dimuons are expected from events where one muon arises from beauty decay and the other from the charm decay of the associated beauty-charm cascade. Taking these processes into account, together with the contribution from charm production, the predicted ratio of like-sign to unlike-sign muon pairs is 0.26±0.03. Experimentally we measure 0.42±0.07±0.03. A natural explanation for the excess of like-sign events is the existence of a significant amount of B0↔B¯0 transitions. The fraction of beauty particles that produce first-generation decay muons with the opposite electric charge from that expected without mixing is deduced to be: χ = 0.121±0.047. Combined with the null result from searches for B0↔B¯0 oscillations at e+e− colliders, our results are consistent with transitions inthe B0s system, as favoured theoretically.

Published
1987

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