Author: "D. Dau" / Topic: particle physics - Searchworks@Jio Institute Digital Library Search Results

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48 results on '"D. Dau"'

1. Quark and diquark fragmentation into neutral strange particles as observed in muon-proton interactions at 280 GeV

Author: D. Blum, F. G. Oakham, Michele Arneodo, B. Pietrzyk, J. Carr, H. E. Stier, J.M. Thenard, Paolo Giubellino, J. Favier, Claus Gössling, P. Grafström, P. R. Norton, T. Schröder, H. Brück, M. Whalley, P. B. Renton, A. Edwards, H. M. Braun, C. Pascaud, E. Böhm, Stephen Wimpenny, J. Williamson, K.H. Becks, J. J. Aubert, M. Pötsch, Kr Long, F. Dengler, Jc Thompson, R. W. Clifft, Christopher Bee, J. Shiers, J. Foster, V. Korbel, J. Pettingale, P. Payre, S. Wheeler, M.I. Ferrero, A. Manz, J. S. Chima, A. Schlagböhmer, J. Nassalski, W. Stockhausen, T. Ernst, C. Benchouk, B. Pönsgen, K. Schultze, N. Geddes, W. D. Dau, G. Kellner, D. Lanske, J. Drees, A. de la Torre, E. Rondio, G. Jancso, M. Studt, C. Broll, H.E. Montgomery, Gy. Wolf, J.K. Davies, D. Callebaut, J.H. Cobb, G. Eszes, Geoffrey Taylor, J. Gayler, P. Zank, F. Janata, I. Derado, Ulrich Landgraf, W. Wittek, E. Nagy, Richard Mount, F. W. Brasse, A. Jacholkowska, T. Dreyer, W. Mohr, H. Wahlen, S. Dahlgren, R. Gamet, J. G. Loken, E. Hagberg, W. Wallucks, Jane Coughlan, G. D'Agostini, F. Grard, V. Eckardt, L. Urban, K. Rith, Jozsef Toth, J. Figiel, Jennifer S. Haas, L. Paul, J. Beaufays, X. De Bouard, F. Combley, M. Maire, J.J. Dumont, W. Flauger, Ph. Heusse, P.J. Hayman, E. Gabathuler, M. Jaffre, F. Montanet, M. Schneegans, J. Krüger, U. Dosselli, Hans Calén, I. G. Bird, G. Coignet, A.M. Osborne, S. Kullander, T. J. Sloan, Cristiana Peroni, Roland Windmolders, C. Hoppe, A. Arvidson, Michael Düren, H. Pessard, L. Gustafsson, E. M. Kabuss, A. S. Johnson, H. Preissner, S.C. Brown, F.J. Hasert, N. Schmitz, G.R. Court, M. Edwards, P. Ribarics, and W.S.C. Williams
Subjects: Physics, Quark, Nuclear and High Energy Physics, Particle physics, Muon, Scattering, Hadron, Nuclear physics, Diquark, symbols.namesake, Fragmentation (mass spectrometry), symbols, Feynman diagram, High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment
Abstract: The production of K 0 s, Λs and Λ s has been studied in a 280 GeV muon-proton scattering experiment with almost complete coverage of all kinematic regions. A study is made of the dependence of the multiplicities on the hadronic centre of mass energy, W , and of the Feynman x distributions. It is found that K 0 and Λ production is mostly central and increases strongly with W , whereas Λ production comes mainly from the remnant target system and is only weakly W dependent.
Published: 2016

2. 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

3. Measurement of $$b\bar b$$ correlations at the CERN $$p\bar p$$ collider

Author: D. J. Holthuizen, I. F. Fensome, C. Markou, M. Demoulin, Jean-Pierre Merlo, Steve McMahon, R. Schleichert, Anton Taurok, T. Moers, Sergio Cittolin, S. Otwinowski, C. Rubbia, Alain Givernaud, M. Rauschkolb, Christopher Seez, H. Teykal, B. Gonzalez, A. Bezaguet, W. von Schlippe, T.I. Meyer, Matthias Schröder, F. Szoncso, R. Prosi, M. Vargas, K. Eggert, A. van Dijk, D. Schinzel, S. Lammel, A. Gonidec, Dave Robinson, Carmen Albajar, H. Wagner, A. Placci, K. Ankoviak, M. Markytan, David B. Cline, Ritva Kinnunen, H. Castilla-Valdez, M. P. J. Landon, E. Eisenhandler, A. Moulin, J. D. Dowell, Nicolas Ellis, L. Fortson, P. Sphicas, Achim Geiser, Andreas Morsch, G. Jorat, C.H. Tan, K. Bos, B. Buschbeck, Hans Reithler, G. Maurin, W. van de Guchte, M. Pimiä, H. Dibon, E. F. Clayton, S. Bartha, L. Taylor, W. Jank, J. Garvey, K. Wacker, C.-E. Wulz, M. Mohammadi, E. Radermacher, S. Tether, Manfred Krammer, J. P. Porte, Konstanty Sumorok, A. Norton, C. D. Buchanan, V. Vuillemin, G. Pancheri, A. Böhrer, H. Faissner, P. I. P. Kalmus, J. A. Caughlan, J. P. Revol, G. Thompson, J. Dorenbosch, Peter Lipa, Veikko Karimäki, J. Gronberg, Pierluigi Zotto, D. Dau, M. Della Negra, Tejinder Virdee, D. Samyn, C. Daum, T.P. Shah, G. Walzel, S. Levegrün, Jorma Tuominiemi, E. Pietarinen, Daniel Denegri, H. Tuchscherer, I. R. Kenyon, Y. Lemoigne, R. Priem, H. Evans, and P. Cennini
Subjects: Physics, Quark, Quantum chromodynamics, Particle physics, Large Hadron Collider, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Order (ring theory), 01 natural sciences, law.invention, Nuclear physics, law, 0103 physical sciences, High Energy Physics::Experiment, Production (computer science), 010306 general physics, Collider, Engineering (miscellaneous), Bar (unit)
Abstract: We report on measurements of correlated$b\bar b$ production in$p\bar p$ collisions at$\sqrt s = 630GeV$, using dimuon data to tag both theb and$\bar b$ quarks. Starting from an inclusive dimuon sample we obtain improved cross-sections for single inclusive beauty production and confirm our earlier results on$B^0 - \bar B^0$ mixing. From a study of$b\bar b$ correlations we derive explicit cross-sections for semi-differential$b\bar b$ production. We compare the measured cross-sections and correlations to$\mathcal{O}\left( {\alpha _s^3 } \right)$ QCD predictions and find good quantitative agreement. From the measured angular distributions we establish a size-able contribution from higher order QCD processes with a significance of about seven standard deviations. A large nonperturbative contribution to these higher order corrections is excluded.
Published: 1994

4. 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

5. 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

6. 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

7. 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

8. 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

9. The H1 Forward Proton Spectrometer at HERA

Author: V. Spaskov, W. Bartel, F. Niebergall, A. Lebedev, H. Luedecke, V. Schroeder, D. Newton, C. Wittek, R. van Staa, U. Harder, P. van Esch, B. List, M. Kapichine, O. Karschnik, K. Hiller, A. Astvatsatourov, H. Mahlke-Krueger, F. W. Buesser, S. K. Kotelnikov, H. Riege, B. Hoffmann, R. Nahnhauer, D. Dau, J. Baehr, T. Wilksen, Sergey Rusakov, K. Geske, J. Schuett, and A. N. Morozov
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Interaction point, Proton, Spectrometer, Physics::Instrumentation and Detectors, Detector, Roman pot, FOS: Physical sciences, HERA, Physics::History of Physics, High Energy Physics - Experiment, law.invention, Nuclear physics, High Energy Physics - Experiment (hep-ex), law, Physics::Accelerator Physics, High Energy Physics::Experiment, Collider, Nuclear Experiment, Instrumentation, Beam (structure)
Abstract: The forward proton spectrometer is part of the H1 detector at the HERA collider. Protons with energies above 500 GeV and polar angles below 1 mrad can be detected by this spectrometer. The main detector components are scintillating fiber detectors read out by position-sensitive photo-multipliers. These detectors are housed in so-called Roman Pots which allow them to be moved close to the circulating proton beam. Four Roman Pot stations are located at distances between 60 m and 90 m from the interaction point., Comment: 20 pages, 10 figures, submitted to Nucl.Instr.and Methods
Published: 2000
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10. Multifractal analysis of minimum bias events in $\sqrt{s}$ = 630 GeV $\overline{p}$p collisions

Author: Vuillemin, Karimaki, Murrough Landon, N Neumeister, A. Ferrando, H. Tuchscherer, Hans Reithler, O. C. Allkofer, P. Cennini, E. F. Clayton, Peter Lipa, A. Placci, R. Priem, I. F. Fensome, E. Radermacher, J. P. Porte, G Thompson, H. Dibon, C. Markou, H. Faissner, D Robinson, Nicolas Ellis, Felicitas Pauss, J. P. Revol, L. Naumann, P I P Kalmus, M. Della Negra, M. Rauschkolb, C H Tan, R. J. Apsimon, L. Taylor, G. Pancheri, P. Sphicas, Andreas Morsch, H. Wagner, D Schinzel, C. Rubbia, A. Böhrer, A. Moulin, G. Jorat, G. Walzel, D. Dau, Achim Geiser, Alain Givernaud, Carmen Albajar, B. Buschbeck, D. Samyn, S. Levegrün, Steve McMahon, K. Wacker, W. Jank, Jorma Tuominiemi, W. von Schlippe, Anton Taurok, Manfred Krammer, Konstanty Sumorok, T. Moers, R. Schleichert, E F Eisenhandler, R. Prosi, Ritva Kinnunen, Tejinder Virdee, M. Pimiä, D Weselka, H. Teykal, J. Garvey, M. Markytan, J. D. Dowell, E. Pietarinen, S. Bartha, T.P. Shah, A. Norton, Stephan Lammel, T.I. Meyer, C.-E. Wulz, A Bezaguet, I. Josa-Mutuberria, M. Demoulin, G. Maurin, J. Salicio, Sergio Cittolin, F. Szoncso, John A Coughlan, Christopher Seez, S. Tether, K. Eggert, E Terrente-Lujan, I. R. Kenyon, and A. Gonidec
Subjects: Physics, Quark, Particle physics, Physics and Astronomy (miscellaneous), Monte Carlo method, Hadron, Observable, Multifractal system, Measure (mathematics), Bin, Exponent, High Energy Physics::Experiment, Statistical physics, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: A search for multifractal structures, in analogy with multifractal theories, is performed on UA1 minimum bias events. A downward concave multifractal spectral function,f(α) (where α is the Lipschitz-Holder exponent), indicates that there are self-similar cascading processes, governing the evolution from the quark to the hadron level, in the final states of hadronic interactions.f(α) is an accurate measure of the bin to bin fluctuations of any observable. It is shown that the most sensitive comparison between data and the Monte Carlo models, GENCL and PYTHIA 4.8 can be made usingf(α). It is found that these models do not fully reproduce the behaviour of the data.
Published: 1992

11. 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

12. 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

13. DUMAND II status report

Author: Yasuo Ohashi, C. E. Roos, A. Yamaguchi, R. J. Wilkes, J. J. Lord, R. Becker-Szendy, John G. Learned, J. Rathlev, D. O'Connor, S. Matsuno, Vincent Z. Peterson, T. Hayashino, H. Bradner, Stephen T. Dye, Tadaichi Kitamura, C. Ley, M. Jaworski, P. Minkowski, Peter K.F. Grieder, R. H. March, Makoto Sakuda, J. M. Clem, Michael S. Webster, P. E. Boynton, D. Dau, K. K. Young, P. Bosetti, V. Commichau, E. Hazen, T. Aoki, A. Roberts, Ugo Camerini, S. Tanaka, G. Wilkins, I. Yamamoto, P. Koske, K. Mitsui, V. J. Stenger, Shunsuke Uehara, K. Kobayakawa, D. Samm, and A. Okada
Subjects: Physics, Particle physics, Neutrino detector, Software deployment, DUMAND Project, Optical detector, Detector, Systems engineering, Junction box, Status report, Particle detector
Abstract: The scientific goals, design, capabilities, and status of the DUMAND II detector system are described. In June, 1989, the High Energy Physics Advisory Panel recommended support for construction of DUMAND II to the U.S. Department of Energy. Funding began in 1990, and prototype development for various detector subsystems is under way. Current plans include deployment of the shore cable, junction box and three strings of optical detector modules in 1992, and expansion to the full 9‐string configuration in 1993.
Published: 1991

14. 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

15. 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

16. 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

17. 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

18. 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

19. 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

20. 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

21. 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

22. 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

23. 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

24. 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

25. 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

26. Analysis of the fragmentation properties of quark and gluon jets at the CERN SPS pp̄ collider

Author: E. Buckley, Daniel Denegri, J. Garvey, J. Rich, Sergio Cittolin, J. D. Dowell, J. P. Lees, E. Pietarinen, R. K. Bock, B. Aubert, L. Dobrzynski, Jorma Tuominiemi, A. Diciaccio, J. Dorenbosch, A. Savoy-Navarro, P. Cennini, Asoke K. Nandi, F. Szoncso, Michael Levi, G. Jorat, I. Sheer, P. Verecchia, Felicitas Pauss, K. Sumorok, W. G. Scott, Filippo Ceradini, Josef Strauss, J. Timmer, J. P. Revol, W. R. Gibson, L. Naumann, D. DiBitonto, C. Bacci, A. Bezaguet, A. Gonidec, R. Frey, Francesco Lacava, C. Perault, B. Sadoulet, D. Kryn, G. Fontaine, T. Redelberger, M. Fincke Keeler, D. J. Holthuizen, G.H. Grayer, L.O. Hertzberger, K.L. Giboni, T. Hansl-Kozanecka, A. Norton, E. Eisenhandler, C. Rubbia, M. Debeer, W.J. Haynes, T. J. McMahon, J. P. Mendiburu, R. J. Homer, W. Guryn, R. Edgecock, J. Ransdell, T. Martin, K. Eggert, I. R. Kenyon, A. Lévêque, Bruce Denby, R. Leuchs, P. Catz, T. C. Meyer, P. Erhard, S. Centro, G. Bauer, R. J. Sobie, R. Frühwirth, Nicolas Ellis, M. Yvert, D. Pitman, B. Van Eijk, D. Linglin, V. Vuillemin, O. C. Allkofer, David B. Cline, M. Demoulin, M. Calvetti, H. D. Wahl, T.P. Shah, Veikko Karimäki, K. Morgan, C. Cochet, G. Salvini, G. Sajot, G. Ciapetti, P. I. P. Kalmus, Hans Reithler, J. Rohlf, Charling Tao, Alain Givernaud, D. Dau, M. Della Negra, S. Geer, A. Honma, H. Lehmann, A. Placci, O. Meyer, C.-E. Wulz, Elizabeth Locci, J. S. Wilson, E. Radermacher, J. P. Porte, Philippe Ghez, J. P. Laugier, S. Levegrün, Y. Giraud-Héraud, T. Wyatt, G. Thompson, Paul Kyberd, Thomas W. Markiewicz, M. Markytan, H. Hofmann, J. Colas, M. Stenzler, M. Corden, G.T.J. Arnison, R. K. Keeler, Dirk L. Hoffmann, J. R. Batley, P. Flynn, Ritva Kinnunen, G. Piano Mortari, M. Pimiä, P. M. Watkins, W. Kozanecki, B. Mours, H. Faissner, A. Astbury, J. Vrana, M. Mohammadi, I. Wingerter, L. Paoluzi, L. Zanello, J.P. Vialle, A. Kernan, C. Roberts, R. Wilke, E. Tscheslog, Paolo Rossi, M. G. Albrow, Michael Rijssenbeek, M. Moricca, Th. Müller, W. Jank, David J. Smith, J. Sass, M. Goodman, C. Ghesquiere, G. Maurin, M.-N. Minard, D. Dallman, D. Schinzel, and J. Streets
Subjects: Quark, Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Hadron, UA1 experiment, Photon structure function, Gluon, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment, Scaling, Particle Physics - Experiment
Abstract: A sample of two-jet events from the UA1 experiment at the CERN pp Collider has been used to study the fragmentation of high-energy quark and gluon jets into charged hadrons. Compared with lower-energy jets observed in e + e − and pp collisions, the fragmentation function measured in the present experiment is softer (i.e. peaked to smaller values of z ) and the mean internal transverse momentum is larger, mainly because of the effects of the QCD scaling violations. Using our knowledge of the quark and gluon structure functions in the proton, together with the QCD matrix elements, a statistical separation of quark and gluon jets is achieved within the present experiment. The fragmentation function for the gluon jets is found to be softer, and the angular spread of the fragmentation products larger, than is the case for quark jets.
Published: 1986

27. Observation of the muonic decay of the charged intermediate vector boson

Author: G. Arnison, A. Astbury, B. Aubert, C. Bacci, G. Bauer, A. Bézaguet, R.K. Bock, T.J.V. Bowcock, M. Calvetti, P. Catz, P. Cennini, S. Centro, F. Ceradini, S. Cittolin, D. Cline, C. Cochet, J. Colas, M. Corden, D. Dallman, D. Dau, M. DeBeer, M. Della Negra, M. Demoulin, D. Denegri, A. Di Ciaccio, D. DiBitonto, L. Dobrzynski, J.D. Dowell, K. Eggert, E. Eisenhandler, N. Ellis, P. Erhard, H. Faissner, M. Fincke, G. Fontaine, R. Frey, R. Frühwirth, J. Garvey, S. Geer, C. Ghesquière, P. Ghez, K.L. Giboni, W.R. Gibson, Y. Giraud-Héraud, A. Givernaud, A. Gonidec, G. Grayer, T. Hansl-Kozanecka, W.J. Haynes, L.O. Hertzberger, D. Hoffmann, H. Hoffmann, D.J. Holthuizen, R.J. Homer, A. Honma, W. Jank, G. Jorat, P.I.P. Kalmus, V. Karimäki, R. Keeler, I. Kenyon, A. Kernan, R. Kinnunen, W. Kozanecki, D. Kryn, F. Lacava, J.-P. Laugier, J.-P. Lees, H. Lehmann, R. Leuchs, A. Lévêque, D. Linglin, E. Locci, J.-J. Malosse, T. Markiewicz, G. Maurin, T. McMahon, J-P. Mendiburu, M.-N. Minard, M. Mohammadi, K. Morgan, M. Moricca, H. Muirhead, F. Muller, A.K. Nandi, L. Naumann, A. Norton, A. Orkin-Lecourtois, L. Paoluzi, F. Pauss, G. Piano Mortari, E. Pietarinen, M. Pimiä, A. Placci, J.P. Porte, E. Radermacher, J. Ransdell, H. Reithler, J.-P. Revol, J. Rich, M. Rijssenbeek, C. Roberts, J. Rohlf, P. Rossi, C. Rubbia, B. Sadoulet, G. Sajot, G. Salvi, G. Salvini, J. Sass, J. Saudraix, A. Savoy-Navarro, D. Schinzel, W. Scott, T.P. Shah, D. Smith, M. Spiro, J. Strauss, J. Streets, K. Sumorok, F. Szoncso, C. Tao, G. Thompson, J. Timmer, E. Tscheslog, J. Tuominiemi, B. Van Eijk, J.-P. Vialle, J. Vrana, V. Vuillemin, H.D. Wahl, P. Watkins, J. Wilson, C.-E. Wulz, Y.G. Xie, M. Yvert, and E. Zurfluh
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Muon, Physics::Instrumentation and Detectors, Branching fraction, Vector boson, Nuclear physics, Particle decay, High Energy Physics::Experiment, Invariant mass, Nuclear Experiment, Particle Physics - Experiment, Lepton, Boson
Abstract: Muons of high transverse momentum p μ T have been observed in the large drift chambers surrounding the UA1 detector at the CERN 540 GeV pp collider. For an integrated luminosity of 108 nb −1 , 14 isolated muons have been found with p T > 15 GeV/ c . They are correlated with a large imbalance in total transverse energy, and show a kinematic behaviour consistent with the muonic decay of the Intermediate Vector Boson W ± of weak interactions. The partial cross section is in agreement with previous measurements for electronic decays and with muon-electron universality. The W mass is determined to be m W = 81 +6 −7 GeV/ c 2 .
Published: 1984

28. 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

29. 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

30. 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

31. Further evidence for charged intermediate vector bosons at the SPS collider

Author: G. Maurin, P. Ghez, D. DiBitonto, G. Sajot, A. Gonidec, A. Placci, Josef Strauss, J. P. Lees, W.R. Gibson, J. Saudraix, Veikko Karimäki, T. J. V. Bowcock, Michel Spiro, A. Di Ciaccio, D. Dau, P.I.P. Kalmus, M.-N. Minard, D. Dallman, L. Paoluzi, B. Sadoulet, D. Schinzel, J. Streets, D. Kryn, W. G. Scott, Charling Tao, W.J. Haynes, C. Bacci, A. Bezaguet, D. J. Holthuizen, G.H. Grayer, A. Lévêque, M. Della Negra, H. Muirhead, A. Honma, S. Centro, Nicolas Ellis, E. Zurfluh, M. Fincke, A. Orkin-Lecourtois, J. Colas, J. P. Revol, Y. Xie, M. Demoulin, C. Ghesquiere, C. Roberts, P. Cennini, M. Corden, G. Thompson, David J. Smith, A. Norton, E. Tscheslog, Thomas W. Markiewicz, T. Hansl-Kozanecka, Richard Wilson, Y. Giraud-Héraud, G. Piano Mortari, G.T.J. Arnison, Alain Givernaud, J. Vrana, J. P. Mendiburu, Ritva Kinnunen, M. Pimiä, P. M. Watkins, M. Calvetti, T.P. Shah, L. Dobrzynski, K. Eggert, R. Frühwirth, B. Van Eijk, Paolo Rossi, G. Jorat, J. Garvey, J. D. Dowell, E. Pietarinen, Michael Rijssenbeek, A. Savoy-Navarro, James Rohlf, R. K. Bock, W. Jank, J. Sass, J. Ransdell, Felicitas Pauss, Filippo Ceradini, Dirk L. Hoffmann, K. Morgan, G. Salvini, R. Leuchs, Richard Keeler, R. J. Homer, W. Kozanecki, H. Faissner, M. Mohammadi, B. Aubert, D. Linglin, M. Debeer, T. J. McMahon, H. D. Wahl, A. Kernan, J. S. Wilson, S. Geer, I. R. Kenyon, P. Erhard, G. Salvi, H. Lehmann, M. Moricca, C.-E. Wulz, Konstanty Sumorok, Elizabeth Locci, J. P. Laugier, R. Frey, Francesco Lacava, H. F. Hoffmann, L.O. Hertzberger, K.L. Giboni, David B. Cline, G. Fontaine, E. Eisenhandler, L. Naumann, F. Muller, Hans Reithler, J. Timmer, C. Rubbia, G. Bauer, P. Catz, E. Radermacher, J. P. Porte, M. Yvert, A. Astbury, V. Vuillemin, Jorma Tuominiemi, J.P. Vialle, Sergio Cittolin, Daniel Denegri, C. Cochet, J. Rich, Asoke K. Nandi, J. J. Malosse, F. Szoncso, and C. Hodges
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), Large Hadron Collider, Weinberg angle, Vector boson, Standard Model, law.invention, Nuclear physics, law, High Energy Physics::Experiment, Collider, Particle Physics - Experiment
Abstract: A sample of 52 Intermediate Vector Boson decays in the ( v e e) channel is described. They were produced at the CERN SPS Collider for an integrated luminosity of 0.136 pb −1 . Both production and decay properties fit well with expectations from the Standard Model of weak interactions. An improved value for the W mass is given and compared with the previously published value for the Z 0 mass.
Published: 1985

32. Experimental observation of lepton pairs of invariant mass around $95 GeV/c^{2}$ at the CERN SPS collider

Author: G. Arnison, A. Astbury, B. Aubert, C. Bacci, G. Bauer, A. Bézaguet, R. Böck, T.J.V. Bowcock, M. Calvetti, P. Catz, P. Cennini, S. Centro, F. Ceradini, S. Cittolin, D. Cline, C. Cochet, J. Colas, M. Corden, D. Dallman, D. Dau, M. DeBeer, M.Della Negra, M. Demoulin, D. Denegri, A. Di Ciaccio, D. Dibitonto, L. Dobrzynski, J.D. Dowell, K. Eggert, E. Eisenhandler, N. Ellis, P. Erhard, H. Faissner, M. Fincke, G. Fontaine, R. Frey, R. Frühwirth, J. Garvey, S. Geer, C. Ghesquière, P. Ghez, K. Giboni, W.R. Gibson, Y. Giraud-Héraud, A. Givernaud, A. Gonidec, G. Grayer, T. Hansl-Kozaȧecka, W.J. Haynes, L.O. Hertzberger, C. Hodges, D. Hoffmann, H. Hoffmann, D.J. Holthuizen, R.J. Homer, A. Honma, W. Jank, G. Jorat, P.I.P. Kalmus, V. Karimäki, R. Keeler, I. Kenyon, A. Kernan, R. Kinnunen, W. Kozanecki, D. Kryn, F. Lacava, J.-P. Laugier, J.-P. Lees, H. Lehmann, R. Leuchs, A. Lévêque, D. Linglin, E. Locci, J.-J. Malosse, T. Markiewicz, G. Maurin, T. McMahon, J.-P. Mendiburu, M.-N. Minard, M. Mohammadi, M. Moricca, K. Morgan, H. Muirhead, F. Muller, A.K. Nandi, L. Naumann, A. Norton, A. Orkin-Lecourtois, L. Paoluzi, F. Pauss, G.Piano Mortari, E. Pietarinen, M. Pimiä, A. Placci, J.P. Porte, E. Radermacher, J. Ransdell, H. Reithler, J.-P. Revol, J. Rich, M. Rijssenbeek, C. Roberts, J. Rohlf, P. Rossi, C. Rubbia, B. Sadoulet, G. Sajot, G. Salvi, G. Salvini, J. Sass, J. Saudraix, A. Savoy-Navarro, D. Schinzel, W. Scott, T.P. Shah, M. Spiro, J. Strauss, J. Streets, K. Sumorok, F. Szoncso, D. Smith, C. Tao, G. Thompson, J. Timmer, E. Tscheslog, J. Touminiemi, B. Van Eijk, J.-P. Vialle, J. Vrana, V. Vuillemin, H.D. Wahl, P. Watkins, J. Wilson, C. Wulz, G.Y. Xie, M. Yvert, and E. Zurfluh
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, Settore FIS/01 - Fisica Sperimentale, Electroweak interaction, Weinberg angle, Elementary particle, Vector boson, Nuclear physics, Pair production, High Energy Physics::Experiment, Invariant mass, Particle Physics - Experiment, Lepton
Abstract: We report the observation of four electron-positron pairs and one muon pair which have the signature of a two-body decay of a particle of mass ∼ 95 GeV/c2. These events fit well the hypothesis that they are produced by the process p + p → Z 0 + X ( with Z 0 → l + + l − ) , where Z0 is the Intermediate Vector Boson postulated by the electroweak theories as the mediator of weak neutral currents.
Published: 1985

33. Events with large missing transverse energy at the cern collider: I.W→τν decay and test of τμe universality at Q2=mw2

Author: Jacqueline Batley, Nicolas Zaganidis, W. R. Gibson, J. P. Mendiburu, A. Schwartz, J. Colas, J. Sass, Dave Charlton, I. Siotis, A. Kernan, G. Sajot, E. Petrolo, W.J. Haynes, G.T.J. Arnison, J. P. Lees, Alessandro Bettini, G. Thompson, K. Sumorok, Carmen Albajar, Anton Taurok, M.-N. Minard, R. Leuchs, G.F. Cox, D. J. Holthuizen, G.H. Grayer, W. Kienzle, J. P. Merlo, K. Bos, D. Pitman, R. K. Keeler, D. Schinzel, G. Bunce, T.P. Shah, Veikko Karimäki, D. Robinson, S. Centro, A. Meneguzzo, M. Demoulin, H. G. Moser, G. Busetto, A. Geisser, Ritva Kinnunen, C. Bacci, Sergio Cittolin, J. Streets, Josef Strauss, A. Bezaguet, Claudia J. Stubenrauch, Pierluigi Zotto, P. M. Watkins, G. Salvini, Stephen Wimpenny, Philippe Ghez, S. Li, Asoke K. Nandi, F. Szoncso, Ehud Duchovni, B. Mours, M. Jimack, G. Piano Mortari, M.J. Corden, S. J. Haywood, J. Vrana, I. Wingerter, R. Frühwirth, Kenneth Long, D. Summers, P. Cennini, C. Ghesquiere, G. Maurin, D. Linglin, Tejinder Virdee, W. G. Scott, L. Villasenor, R. Frey, Francesco Lacava, C. Perault, Christopher Seez, B. Van Eijk, D. Clarke, L. Zanello, H. Grassmann, D. Pascoli, L. Dobrzynski, D. Kryn, C. Markou, J. D. Dowell, S. Levegrün, S. Beingessner, John A Coughlan, G. Jorat, P. Erhard, Paul Kyberd, I. Sheer, M. Markytan, J. Dorenbosch, A. Savoy-Navarro, Y. Giraud-Héraud, T. Wyatt, J. P. Debrion, Paolo Rossi, Michael Levi, H. Faissner, P. Petta, P. Nedelec, Th. Müller, W. Jank, Akram Khan, P. Colas, I. F. Fensome, P. Flynn, E. Tscheslog, Daniel J. Smith, Nicolas Ellis, M. Mohammadi, P. I. P. Kalmus, T. Markiewicz, Alain Givernaud, D. Samyn, Charling Tao, D. Dau, M. Della Negra, S. Geer, M. G. Albrow, A. Honma, H. D. Wahl, L. Naumann, J. N. Bellinger, D. Cline, Felicitas Pauss, Filippo Ceradini, J. Kroll, Paolo Giacomelli, C. Pigot, M. Pincke-Keeler, R. J. Homer, O. C. Allkofer, R. Edgecock, J. Garvey, J. Rohlf, T. Redelberger, E. Buckley, R. J. Sobie, K. Wacker, M. Debeer, H. F. Hoffmann, H. von der Schmitt, I. R. Kenyon, J. A. Wilson, Manfred Krammer, M. Pimiä, Hans Reithler, D. Gee, K. Morgan, M. Degiorgi, W. Ruhm, A. Placci, A. Gonidec, K. Eggert, W. von Schlippe, E. Radermacher, A. Astbury, T.I. Meyer, J. P. Porte, C. Zaccardelli, Bruce Denby, P. Catz, V. Vuillemin, S. Tether, C.-E. Wulz, Elizabeth Locci, M. Ikeda, J.P. Vialle, F. Ghio, C. Rubbia, J. P. Laugier, B. Aubert, G. Bauer, G. Fontaine, A. Norton, L. Gately, E. Eisenhandler, T. C. Bacon, I. ten Have, M. Yvert, P. Sphicas, A. Wildish, N. Bains, X. Wu, I. Zacharov, C. Cochet, Jorma Tuominiemi, G. Ciapetti, T. Axon, Jeffrey Richman, M. Moricca, J. P. Revol, E. Pietarinen, Daniel Denegri, and A. Diciaccio
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Transverse plane, Particle physics, Large Hadron Collider, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Nuclear Experiment, UA1 experiment, Universality (dynamical systems)
Abstract: We report results based on a sample of events with large missing transverse energy corresponding to 715 nb−n of data from the UA1 experiment at the CERN proton-antiproton collider. High transverse-momentum tau-leptons from W decays are observed for the first time through their semi-hadronic decay modes and associated missing transverse energy. The measured relative rates of W→eν, W→μν, and W→τν provide the first direct tests of the electron-muon-tau universality of the weak charged couplings at Q2=mw2. We determine g τ g e =1.01±0.09±0.05 and g μ g e =1.05±0.07±0.08 .
Published: 1987

34. Events with large missing transverse energy at the cern collider: II. search for the decays of W± into heavy leptons and of Z0 into non-interacting particles

Author: G. Busetto, C. Bacci, A. Taurok, A. Bezaguet, P. Nedelec, John Wilson, Jacqueline Batley, Paolo Rossi, L. Dobrzynski, B. Aubert, Akram Khan, P. Colas, R. Frühwirth, M. Degiorgi, S. Tether, Felicitas Pauss, Nicolas Ellis, Filippo Ceradini, K. Eggert, E. Petrolo, G. Sajot, E. Tscheslog, H. F. Hoffmann, Daniel J. Smith, V. Vuillemin, W. von Schlippe, Veikko Karimäki, O. C. Allkofer, J. P. Mendiburu, P. Petta, J. Rohlf, A. Wildish, Sergio Cittolin, W.R. Gibson, P. Kyberd, P. I. P. Kalmus, S. Levegrün, C.-E. Wulz, Elizabeth Locci, Th. Müller, D. Linglin, P. Ghez, J. Kroll, Paolo Giacomelli, W. Jank, C. Zaccardelli, Alain Givernaud, J. P. Laugier, D. Pitman, A. Astbury, Bruce Denby, P. Catz, L. Villasenor, G.T.J. Arnison, J. Dorenbosch, A. Savoy-Navarro, Pierluigi Zotto, Asoke K. Nandi, E. Radermacher, F. Szoncso, G. Maurin, T. Redelberger, E. Buckley, Y. Giraud-Héraud, Richard Keeler, T. Wyatt, Anna Teresa Meneguzzo, Dave Charlton, Michael Levi, W. Ruhm, Josef Strauss, Tejinder Virdee, J. P. Lees, R. J. Homer, K. Wacker, R. Frey, Francesco Lacava, David B. Cline, M. Pimiä, Alessandro Bettini, G. Thompson, R. Leuchs, C. Rubbia, C. Perault, J. Streets, Manfred Krammer, H. Faissner, D. Clarke, Ritva Kinnunen, G. Bauer, Claudia J. Stubenrauch, G. Bunce, Margret Fincke-Keeler, E. Pietarinen, Daniel Denegri, A. Gonidec, T. C. Meyer, J. P. Debrion, N. Zaganidis, A. Schwartz, I. Siotis, G. Salvini, S. Li, A. Placci, B. Mours, W.J. Haynes, K. Sumorok, Hans Reithler, D. Gee, H. D. Wahl, M. Debeer, M.J. Corden, S. J. Haywood, G. Cox, D. Pascoli, Carmen Albajar, I. Wingerter, M. Moricca, J. P. Revol, T. P. Shah, A. Kernan, F. Ghio, T. Markiewicz, J. P. Merlo, J. N. Bellinger, M.-N. Minard, R. Edgecock, D. Samyn, L. Naumann, Kenneth Long, Ehud Duchovni, J. Vrana, W. Kienzle, K. Bos, I. R. Kenyon, D. Schinzel, K. Morgan, M. Yvert, Charling Tao, Stephen Wimpenny, I. F. Fensome, P. Flynn, A. Diciaccio, John A Coughlan, P. Sphicas, M. Markytan, N. Bains, D. Dau, C. Pigot, L. Zanello, M. Jimack, M. Della Negra, J. Garvey, S. Geer, A. Honma, Christopher Seez, J. Colas, S. Beingessner, D. J. Holthuizen, G.H. Grayer, C. Cochet, G. Ciapetti, M. Ikeda, D. Summers, Randall Sobie, A. Norton, J.P. Vialle, X. Wu, Jorma Tuominiemi, G. Piano Mortari, J. P. Porte, D. Robinson, C. Ghesquiere, G. Fontaine, P. Erhard, S. Centro, B. Van Eijk, Peter Watkins, M. Demoulin, E. Eisenhandler, I. Zacharov, H. von der Schmitt, J. D. Dowell, T. Axon, Jeffrey Richman, A. Geiser, L. Gately, T. C. Bacon, I. ten Have, M. Mohammadi, Michael Albrow, W. G. Scott, G. Jorat, I. Sheer, C. Markou, P. Cennini, J. Sass, H. Grassmann, D. Kryn, and H. G. Moser
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, High Energy Physics::Phenomenology, UA1 experiment, law.invention, Standard Model, Nuclear physics, Transverse plane, law, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Collider, Event (particle physics), Lepton
Abstract: We report on further analysis of events with large missing transverse energy from 715 nb −1 of data from the UA1 experiment at the CERN proton-antiproton collider. Measured W and Z 0 rates and heavy flavour cross sections are used to predict rates of missing transverse energy event from all known standard model process. Limits are derived on two possible new sources, namely: (1) semi-hadronic decays of a fourth sequential charged heavy lepton coupling to the W boson, (2) Z 0 decays into additional pairs of non-interacting particles. After taking into additional pairs of non-interacting particles. After taking into account all known sources of missing transverse energy events, we find a mass limit on a fourth-generation charged lepton of m L >41 GeV / c 2 (90% CL) and a limit on the number of additional neutrino species of n ⩽7 (90% CL).
Published: 1987

35. 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

36. Search for massive eνγ and μνγ final states at the CERN super proton synchrotron collider

Author: G. Arnison, A. Astbury, B. Aubert, C. Bacci, G. Bauer, A. Bézaguet, R.K. Bock, T.J.V. Bowcock, M. Calvetti, P. Catz, P. Cennini, S. Centro, F. Ceradini, S. Cittolin, D. Cline, C. Cochet, J. Colas, M. Corden, D. Dallman, D. Dau, M. DeBeer, M. Della Negra, M. Demoulin, D. Denegri, A. Di Ciaccio, D. DiBitonto, L. Dobrzynski, J.D. Dowell, K. Eggert, E. Eisenhandler, N. Ellis, P. Erhard, H. Faissner, M. Fincke, G. Fontaine, R. Frey, R. Frühwirth, J. Garvey, S. Geer, C. Ghesquière, P. Ghez, K.L. Giboni, W.R. Gibson, Y. Giraud-Héraud, A. Givernaud, A. Gonidec, G. Grayer, T. Hansl-Kozanecka, W.J. Haynes, L.O. Hertzberger, C. Hodges, D. Hoffmann, H. Hoffmann, D.J. Holthuizen, R.J. Homer, A. Honma, W. Jank, G. Jorat, P.I.P. Kalmus, V. Karimäki, R. Keeler, I. Kenyon, A. Kernan, R. Kinnunen, W. Kozanecki, D. Kryn, F. Lacava, J.-P. Laugier, J.-P. Lees, H. Lehmann, R. Leuchs, A. Lévêque, D. Linglin, E. Locci, J.-J. Malosse, T. Markiewicz, G. Maurin, T. McMahon, J.-P. Mendiburu, M.-N. Minard, M. Mohammadi, M. Moricca, K. Morgan, H. Muirhead, F. Muller, A.K. Nandi, L. Naumann, A. Norton, A. Orkin-Lecourtois, L. Paoluzi, F. Pauss, G. Piano Mortari, E. Pietarinen, M. Pimiä, A. Placci, J.P. Porte, E. Radermacher, J. Ransdell, H. Reithler, J.-P. Revol, J. Rich, M. Rijssenbeek, C. Roberts, J. Rohlf, P. Rossi, C. Rubbia, B. Sadoulet, G. Sajot, G. Salvi, G. Salvini, J. Sass, J. Saudraix, A. Savoy-Navarro, D. Schinzel, W. Scott, T.P. Shah, D. Smith, M. Spiro, J. Strauss, J. Streets, K. Sumorok, F. Szoncso, C. Tao, G. Thompson, J. Timmer, E. Tscheslog, J. Tuominiemi, B. Van Eijk, J.-P. Vialle, J. Vrana, V. Vuillemin, H.D. Wahl, P. Watkins, J. Wilson, R. Wilson, C.-E. Wulz, Y.G. Xie, M. Yvert, and E. Zurfluh
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, Large Hadron Collider, Luminosity (scattering theory), Elementary particle, Super Proton Synchrotron, law.invention, Nuclear physics, law, Radiative transfer, Physics::Accelerator Physics, High Energy Physics::Experiment, Collider, Lepton
Abstract: The observation of an apparent excess of radiative Z 0 decays into e + e − γ and μ + μ − γ has prompted the search for massive eνγ and μνγ final states containing an energetic photon. No events were found other than those consistent with QED radiative effects in leptonic W decays. The data sample corresponds to an integrated luminosity of 0.136 pb −1 produced at the CERN super proton synchrotron (SPS) collider. An upper limit on the occurrence of such events is given.
Published: 1984

37. 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

38. Production of W's with large transverse momentum at the CERN proton-antiproton collider

Author: A. Astbury, L. Dobrzynski, H. von der Schmitt, David B. Cline, G. Jorat, D. J. Holthuizen, G.H. Grayer, I. Sheer, E. Tscheslog, Daniel J. Smith, T. Markiewicz, Richard Keeler, D. Robinson, Charling Tao, S. Centro, J.P. Vialle, M. Degiorgi, Christian Ghiglino, D. Dau, M. Della Negra, W. Ruhm, K. Wacker, Christopher Seez, Jacqueline Batley, S. Geer, A. Honma, Alessandro Bettini, G. Thompson, M. Yvert, M. Demoulin, C. Markou, P. Sphicas, N. Bains, Hans Reithler, Manfred Krammer, A. Savoy-Navarro, L. Gately, Elizabeth Locci, D. Gee, J. Dorenbosch, J. Colas, K. Morgan, J. P. Laugier, S. Levegrün, E. Pietarinen, Daniel Denegri, A. Placci, J. P. Mendiburu, C. Ghesquiere, P. Erhard, T. C. Bacon, M. Debeer, G. Sajot, I. ten Have, W.R. Gibson, J. P. Debrion, J. P. Porte, J. Sass, C. Cochet, R. Edgecock, A. Diciaccio, Y. Giraud-Héraud, T. Wyatt, P. Nedelec, G. Ciapetti, Felicitas Pauss, Akram Khan, K. Bos, P. Colas, M. Ikeda, I. R. Kenyon, Michael Albrow, P.I.P. Kalmus, Anna Teresa Meneguzzo, Dave Charlton, V. Vuillemin, Filippo Ceradini, A. Norton, K. Sumorok, K. Eggert, W. G. Scott, D. Linglin, E. Petrolo, S. Beingessner, L. Villasenor, C. Rubbia, J. Kroll, Nicolas Ellis, G. Piano Mortari, G. Bauer, T. C. Meyer, G. Maurin, G.T.J. Arnison, M. Pimiä, D. Clarke, N. Zaganidis, X. Wu, G. Cox, M.-N. Minard, A. Kernan, P. Cennini, B. Aubert, Kenneth Long, Alain Givernaud, D. Schinzel, M. Moricca, Jorma Tuominiemi, J. D. Dowell, H. Faissner, J. P. Revol, John A Coughlan, Ritva Kinnunen, S. Li, I. F. Fensome, P. Flynn, B. Mours, Randall Sobie, M. Markytan, A. Wildish, M.J. Corden, S. J. Haywood, R. J. Homer, I. Wingerter, M. Mohammadi, Margret Fincke-Keeler, I. Zacharov, Sergio Cittolin, B. Van Eijk, Peter Watkins, Asoke K. Nandi, F. Szoncso, T. Axon, Jeffrey Richman, H. D. Wahl, T. P. Shah, J. N. Bellinger, L. Naumann, A. Geiser, C. Pigot, P. Kyberd, W. Kienzle, J. Garvey, Tejinder Virdee, R. Frey, Francesco Lacava, C. Perault, D. Pascoli, D. Samyn, Ehud Duchovni, M. Jimack, J. Vrana, J. Streets, Claudia J. Stubenrauch, A. Gonidec, G. Salvini, Stephen Wimpenny, L. Zanello, Paolo Rossi, P. Petta, Th. Müller, W. Jank, Veikko Karimäki, Pierluigi Zotto, H. Grassmann, D. Kryn, A. Schwartz, I. Siotis, W.J. Haynes, A. Taurok, Carmen Albajar, S. Tether, J. P. Merlo, H. G. Moser, G. Busetto, C. Bacci, A. Bezaguet, John Wilson, Claudia-Elisabeth Wulz, P. Ghez, H. F. Hoffmann, J. P. Lees, E. Radermacher, Josef Strauss, R. Leuchs, O. C. Allkofer, G. Pancheri, J. Rohlf, G. Fontaine, D. Summers, T. Redelberger, E. Buckley, E. Eisenhandler, W. von Schlippe, C. Zaccardelli, Bruce Denby, and P. Catz
Subjects: Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Proton, Hadron, UA1 experiment, law.invention, Nuclear physics, Transverse plane, Antiproton, law, High Energy Physics::Experiment, Nuclear Experiment, Collider, Particle Physics - Experiment
Abstract: We have measured the W transverse momentum distribution (pTW) using a sample of 323 W → eν and W → μν events produced in proton-antiproton collisions at the CERN collider. In the present letter we extend the study of the distribution up to pTW ∼- m W and compare to leading and higher order QCD. This comparison is a precise test of QCD with hadron colliders and the inclusive spectrum gives good agreement over a large range of pTW. However we observed two events at very large pTW (∼- 100 GeV/c) in which the W candidate recoils against an energetic di-jet system. Both events have a very large missing transverse energy and a jet-jet mass compatible with the W mass. In a separate analysis, a topologically similar event has been observed in which a high-mass di-jet system is balanced by a large missing transverse energy which could be interpreted as Z0 → ν ν decay. We cannot easily explain these three events in terms of explicit second-order QCD calculations. However we cannot exclude at this stage the possibility that they are the result of non-gaussian fluctuations in the response of UA1 calorimetry or a statistical fluctuation in the data.
Published: 1987

39. Measurement of the inclusive jet cross section at the CERN p collider

Author: G. Arnison, M.G. Albrow, O.C. Allkofer, A. Astbury, B. Aubert, C. Bacci, J.R. Batley, G. Bauer, A. Bettini, A. Bézaguet, R.K. Bock, K. Bos, E. Buckley, J. Bunn, G. Busetto, P. Catz, P. Cennini, S. Centro, F. Ceradini, G. Ciapetti, S. Cittolin, D. Clarke, D. Cline, C. Cochet, J. Colas, P. Colas, M. Corden, G. Cox, D. Dallman, D. Dau, M. Debeer, J.P. Debrion, M. Degiorgi, M. Della Negra, M. Demoulin, B. Denby, D. Denegri, A. Diciaccio, L. Dobrzynski, J. Dorenbosch, J.D. Dowell, E. Duchovni, R. Edgecock, K. Eggert, E. Eisenhandler, N. Ellis, P. Erhard, H. Faissner, M. Fince Keeler, P. Flynn, G. Fontaine, R. Frey, R. Frühwirth, J. Garvey, D. Gee, S. Geer, C. Ghesquière, P. Ghez, F. Ghio, P. Giacomelli, W.R. Gibson, Y. Giraud-Héraud, A. Givernaud, A. Gonidec, M. Goodman, H. Grassmann, G. Grayer, W. Guryn, T. Hansl-Kozanecka, W. Haynes, S.J. Haywood, H. Hoffmann, D.J. Holthuizen, R.J. Homer, A. Honma, W. Jank, M. Jimack, G. Jorat, P.I.P. Kalmus, V. Karimäri, R. Keeler, I. Kenyon, A. Kernan, W. Kienzle, R. Kinnunen, W. Kozanecki, J. Kroll, D. Kryn, P. Kyberd, F. Lacava, J.P. Laugier, J.P. Lees, R. Leuchs, S. Levegrun, A. Lévêque, M. Levi, D. Linglin, E. Locci, K. Long, T. Markiewicz, M. Markytan, T. Martin, F. Maurin, T. McMahon, J.-P. Mendiburu, A. Meneguzzo, O. Meyer, T. Meyer, M.-N. Minard, M. Mohammadi, K. Morgan, M. Moricca, H. Moser, B. Mours, Th. Muller, A. Nandi, L. Naumann, A. Norton, L. Paoluzi, D. Pascoli, F. Pauss, C. Perault, G. Piano Mortari, E. Pietarinen, C. Pigot, M. Pimiä, D. Pitman, A. Placci, J.-P. Porte, E. Radermacher, J. Ransdell, T. Redelberger, H. Reithler, J.P. Revol, J. Richman, M. Rijssenbeek, J. Rohlf, P. Rossi, C. Roberts, W. Ruhm, C. Rubbia, G. Sajot, G. Salvini, J. Sass, B. Sadoulet, D. Samyn, A. Savoy-Navarro, D. Schinzel, A. Schwartz, W. Scott, T.P. Shah, I. Sheer, I. Siotis, D. Smith, R. Sobie, P. Sphicas, J. Strauss, J. Streets, C. Stubenrauch, D. Summers, K. Sumorok, F. Szonczo, C. Tao, I. Ten Have, G. Thompson, E. Tscheslog, J. Tuominiemi, B. Van Eijk, P. Verecchia, J.P. Vialle, T.S. Virdee, H. Von Der Schmitt, W. Von Schlippe, J. Vrana, V. Vuillemin, H.D. Wahl, P. Watkins, R. Wilke, J. Wilson, I. Wingerter, S.J. Wimpenny, C.-E. Wulz, T. Wyatt, M. Yvert, I. Zacharov, N. Zaganidis, L. Zanello, and P. Zotto
Subjects: Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, 010308 nuclear & particles physics, Jet (particle physics), 7. Clean energy, 01 natural sciences, UA1 experiment, law.invention, Nuclear physics, Cross section (physics), law, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Collider, Scaling
Abstract: The inclusive jet cross section has been measured in the UA1 experiment at the CERN p p Collider at centre-of-mass energies √s = 546 GeV and √s = 630 eV. The cross sections are found to be consistent with QCD predictions, The observed change in the cross section with the centre-of-mass energy √s is accounted for in terms of xT scaling.
Published: 1986

40. 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

41. BEAUTY PRODUCTION AT THE CERN PROTON-ANTIPROTON COLLIDER

Author: W.R. Gibson, Tejinder Virdee, R. Frey, Francesco Lacava, C. Perault, F. Ghio, T. Markiewicz, Margret Fincke-Keeler, L. Dobrzynski, D. Pitman, W. Ruhm, J. P. Revol, A. Placci, V. Vuillemin, D. Pascoli, Charling Tao, L. Naumann, H. D. Wahl, G. Jorat, R. Edgecock, D. Dau, M. Della Negra, S. Geer, C. Pigot, A. Honma, I. Sheer, E. Buckley, N. Zaganidis, G. Bauer, M. Markytan, K. Sumorok, J. N. Bellinger, B. Aubert, A. Wildish, M. Debeer, J. Colas, I. R. Kenyon, Paolo Rossi, Sergio Cittolin, P. Ghez, A. Kernan, T. P. Shah, D. J. Holthuizen, G.H. Grayer, H. Faissner, P. Kyberd, J. R. Batley, I. F. Fensome, P. Flynn, P.I.P. Kalmus, Anna Teresa Meneguzzo, Dave Charlton, E. Radermacher, Alain Givernaud, P. Cennini, Josef Strauss, Alessandro Bettini, G. Thompson, T. Bacon, G. Cox, D. Robinson, D. Samyn, S. Beingessner, H. von der Schmitt, J. P. Lees, Randall Sobie, Ehud Duchovni, A. Norton, J. Dorenbosch, T. C. Meyer, Asoke K. Nandi, W. Kienzle, P. Petta, C. Bacci, S. Centro, A. Savoy-Navarro, F. Szoncso, H. Grassmann, Th. Müller, M. Jimack, David B. Cline, G.T.J. Arnison, C. Markou, W. Jank, Kenneth Long, M. Mohammadi, G. Piano Mortari, M. Demoulin, D. Kryn, E. Pietarinen, Daniel Denegri, R. Leuchs, D. Linglin, L. Gately, Hans Reithler, A. Schwartz, Christopher Seez, I. Siotis, L. Villasenor, M. Degiorgi, J. Garvey, Ritva Kinnunen, D. Gee, Michael Albrow, S. Levegrün, J. P. Debrion, K. Morgan, C. Ghesquiere, W.J. Haynes, Veikko Karimäki, Carmen Albajar, Richard Keeler, S. Li, I. ten Have, B. Mours, G. Bunce, A. Diciaccio, J. Streets, B. Van Eijk, Y. Giraud-Héraud, M.-N. Minard, A. Taurok, Claudia J. Stubenrauch, A. Gonidec, David Smith, J. P. Merlo, Pierluigi Zotto, D. Schinzel, M.J. Corden, S. J. Haywood, I. Wingerter, J. Sass, T. Wyatt, Peter Watkins, G. Salvini, H. G. Moser, G. Busetto, J. P. Mendiburu, J. Rohlf, J. Vrana, K. Bos, K. Wacker, P. Erhard, Stephen Wimpenny, P. Nedelec, Felicitas Pauss, M. Ikeda, Filippo Ceradini, J. P. Porte, L. Zanello, A. Astbury, Manfred Krammer, A. Bezaguet, C.-E. Wulz, Elizabeth Locci, J. Kroll, Paolo Giacomelli, G. Maurin, E. Tscheslog, Akram Khan, P. Colas, R. Frühwirth, X. Wu, J. P. Laugier, S. Tether, M. Pimiä, D. Clarke, John Wilson, W. G. Scott, R. J. Homer, J.P. Vialle, K. Eggert, E. Petrolo, Jorma Tuominiemi, J. D. Dowell, G. Fontaine, John A Coughlan, Nicolas Ellis, O. C. Allkofer, I. Zacharov, D. Summers, T. Redelberger, T. Axon, Jeffrey Richman, A. Geiser, E. Eisenhandler, H. F. Hoffmann, W. von Schlippe, C. Zaccardelli, Bruce Denby, P. Catz, M. Moricca, M. Yvert, P. Sphicas, N. Bains, C. Cochet, G. Ciapetti, C. Rubbia, and G. Sajot
Subjects: Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Muon, media_common.quotation_subject, UA1 experiment, Nuclear physics, Angular distribution, Antiproton, Beauty, High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment, media_common
Abstract: We report evidence for beauty particle production through the observation of dimuon events from proton-antiproton collisions at energies of √s=546 GeV and √s=630 GeV at the CERN collider. Our data indicate that semi-leptonic decays of beauty particles are the dominant source of pairs of high-pT muons. The beauty flavour creation (gg or q¯q→b¯b) cross-section needed to explain the dimuon rate is σ{p¯p→b¯b+X, pbT5 GeV/c, |η
Published: 1987

42. Associated production of an isolated, large-transverse-momentum lepton (electron or muon), and two jets at the CERN $p\overline{p}$ collider

Author: G. Arnison, O.C. Allkofer, A. Astbury, B. Aubert, C. Bacci, G. Bauer, A. Bézaguet, R.K. Bock, T.J.V. Bowcock, M. Calvetti, P. Catz, P. Cennini, S. Centro, F. Ceradini, S. Cittolin, D. Cline, C. Cochet, J. Colas, M. Corden, D. Dallman, D. Dau, M. DeBeer, M.Della Negra, M. Demoulin, D. Denegri, D. DiBitonto, A. Di Ciaccio, L. Dobrzynski, J.D. Dowell, K. Eggert, E. Eisenhandler, N. Ellis, P. Erhard, H. Faissner, M. Fincke, P. Flynn, G. Fontaine, R. Frey, R. Frühwirth, J. Garvey, S. Geer, C. Ghesquière, P. Ghez, W.R. Gibson, Y. Giraud-Héraud, A. Givernaud, A. Gonidec, G. Grayer, W. Guryn, T. Hansl-Kozanecka, W.J. Haynes, L.O. Hertzberger, D. Hoffmann, H. Hoffmann, D.J. Holthuizen, R.J. Homer, A. Honma, W. Jank, G. Jorat, P.I.P. Kalmus, V. Karimäki, R. Keeler, I. Kenyon, A. Kernan, R. Kinnunen, W. Kozanecki, D. Kryn, P. Kyberd, F. Lacava, J.-P. Laugier, J.-P. Lees, H. Lehmann, R. Leuchs, A. Lévêque, D. Linglin, E. Locci, M. Loret, T. Markiewicz, G. Maurin, T. McMahon, J.-P. Mendiburu, M.-N. Minard, M. Mohammadi, M. Moricca, K. Morgan, F. Muller, A.K. Nandi, L. Naumann, A. Norton, A. Orkin-Lecourtois, L. Paoluzi, F. Paus, G.Piano Mortari, E. Pietarinen, M. Pimiä, D. Pitman, A. Placci, J.-P. Porte, E. Radermacher, J. Ransdell, H. Reithler, J.-P. Revol, J. Rich, M. Rijssenbeek, C. Roberts, J. Rohlf, P. Rossi, C. Rubbia, B. Sadoulet, G. Sajot, G. Salvini, J. Sass, A. Savoy-Navarro, D. Schinzel, W. Scott, T.P. Shah, I. Sheer, D. Smith, J. Strauss, J. Streets, K. Sumorok, F. Szoncso, C. Tao, G. Thompson, J. Timmer, E. Tscheslog, J. Tuominiemi, B. van Eijk, J.-P. Vialle, J. Vrana, V. Vuillemin, H.D. Wahl, P. Watkins, J. Wilson, I. Wingerter, C.-E. Wulz, and M. Yvert
Subjects: Quark, Physics, Semileptonic decay, Nuclear and High Energy Physics, Particle physics, Top quark, Muon, High Energy Physics::Phenomenology, Bottom quark, Nuclear physics, Particle decay, High Energy Physics::Experiment, Invariant mass, Particle Physics - Experiment, Lepton
Abstract: A clear signal is observed for the production of an isolated large-transverse-momentum lepton in association with two or three centrally produced jets. The two-jet events cluster around the W± mass, indicating a novel decay of the Intermediate Vector Boson. The rate and features of these events are not consistent with expectations of known quark decays (charm, bottom). They are, however, in agreement with the process W → t b followed by t → blv, where t is the sixth quark (top) of the weak Cabibbo current. If this is indeed so, the bounds on the mass of the top quark are 30 GeV/c2
Published: 1984

43. Angular distributions for high-mass jet pairs and a limit on the energy scale of compositeness for quarks from the CERN pp̄ collider

Author: J. Vrana, T. C. Bacon, Felicitas Pauss, M. Ikeda, I. ten Have, L. Zanello, Filippo Ceradini, G.T.J. Arnison, J. Kroll, Paolo Giacomelli, M. Yvert, P. Sphicas, R. K. Keeler, J. Garvey, M. Goodman, R. K. Bock, R. J. Homer, Ritva Kinnunen, P. M. Watkins, E. Buckley, B. Mours, H. D. Wahl, D. J. Holthuizen, G.H. Grayer, Hans Reithler, J. N. Bellinger, D. Gee, C. Cochet, M.J. Corden, S. J. Haywood, I. Wingerter, P. Erhard, G. Ciapetti, G. Sajot, R. Wilke, Paolo Rossi, G. Bauer, D. Robinson, G. Maurin, A. Astbury, R. Frühwirth, A. Schwartz, S. Centro, D. Linglin, D. Pitman, O. Meyer, D. Clarke, G. Fontaine, L. Villasenor, I. Siotis, Sergio Cittolin, F. Ghio, C. Rubbia, A. Norton, M. Demoulin, P. Cennini, K. Morgan, J. D. Dowell, W. G. Scott, E. Eisenhandler, Michael Rijssenbeek, A. Kernan, Michael Albrow, John A Coughlan, Anton Taurok, H. Grassmann, M. Moricca, W. von Schlippe, D. Kryn, J. P. Revol, A. Placci, W.J. Haynes, T.I. Meyer, M.-N. Minard, Th. Müller, W. Jank, C. Zaccardelli, C. Ghesquiere, W. Kienzle, Bruce Denby, Kenneth Long, D. Schinzel, Philippe Ghez, P. Catz, K. Sumorok, L. Naumann, J. P. Porte, M. Debeer, C. Pigot, Stephen Wimpenny, S. Tether, B. Sadoulet, Asoke K. Nandi, T. Martin, F. Szoncso, Nicolas Zaganidis, P. Verecchia, Veikko Karimäki, Tejinder Virdee, T. J. McMahon, H. G. Moser, G. Busetto, Carmen Albajar, R. Frey, Francesco Lacava, C. Perault, H. Faissner, J.P. Vialle, H. von der Schmitt, T. P. Shah, A. Lévêque, J. R. Batley, P. Flynn, P. Colas, D. Pascoli, Pierluigi Zotto, A. Bezaguet, Ehud Duchovni, L. Dobrzynski, M. Jimack, K. Bos, W. R. Gibson, S. Levegrün, D. Summers, J. Streets, Claudia J. Stubenrauch, J. P. Mendiburu, W. Guryn, G. Salvini, V. Vuillemin, G. Jorat, I. Sheer, W. Kozanecki, M. Fincke Keeler, Anna Teresa Meneguzzo, E. Petrolo, I. Zacharov, Alessandro Bettini, G. Thompson, G.F. Cox, Nicolas Ellis, T. Hansl-Kozanecka, Y. Giraud-Héraud, T. Wyatt, C. Bacci, T. Axon, Jeffrey Richman, E. Radermacher, T. Markiewicz, Charling Tao, D. Dau, M. Della Negra, S. Geer, A. Honma, Alain Givernaud, D. Samyn, I. R. Kenyon, J. A. Wilson, Josef Strauss, J. Sass, Michael Levi, J. P. Lees, W. Ruhm, R. Leuchs, A. Gonidec, E. Pietarinen, Daniel Denegri, A. Diciaccio, B. Aubert, O. C. Allkofer, A. Wildish, Jorma Tuominiemi, J. Rohlf, R. J. Sobie, Manfred Krammer, H. F. Hoffmann, M. Pimiä, K. Eggert, T. Redelberger, E. Tscheslog, Daniel J. Smith, P. I. P. Kalmus, R. Edgecock, J. Ransdell, J. Dorenbosch, A. Savoy-Navarro, J. P. Debrion, M. Degiorgi, C.-E. Wulz, Elizabeth Locci, J. P. Laugier, David B. Cline, J. Colas, G. Piano Mortari, Paul Kyberd, M. Markytan, M. Mohammad, and B. Van Eijk
Subjects: Quark, Physics, Nuclear and High Energy Physics, Jet (fluid), Range (particle radiation), Particle physics, Large Hadron Collider, Scale (ratio), Astrophysics::High Energy Astrophysical Phenomena, Quark model, law.invention, Nuclear physics, Distribution (mathematics), law, High Energy Physics::Experiment, Collider, Particle Physics - Experiment
Abstract: Angular distributions of high-mass jet pairs (180 ( s =630 GeV ) . We show that angular distributions are independent of the subprocess centre-of-mass (CM) energy over this range, and use the data to put constraints on the definition of the Q2 scale. The distribution for the very high mass jet pairs (240 415 GeV at 95% confidence level.
Published: 1986

44. W production properties at the CERN SPS Collider

Author: O. Meyer, F. Ghio, E. Frühwirth, Veikko Karimäki, G. Jorat, P. Verecchia, M. Debeer, D. Dau, Guido Ciapetti, M. Stenzler, I. Siotis, P. Erhard, A. Bezaguet, K. Eggert, G. Fontaine, Hans Reithler, Pierluigi Zotto, B. Sadoulet, G. Busetto, Joe Kroll, M. Pimiä, T. Mc Mahon, Randall Sobie, W. E. Gibson, R. Leuchs, P. I. P. Kalmus, Richard Keeler, J.P. Vialle, Claudia-Elisabeth Wulz, D. Summers, G. Bauer, P. Ghez, D. Cline, John Wilson, H. G. Moser, M. Fincke Keeler, Thomas W. Markiewicz, D. J. Holthuizen, H. Faissner, Alessandro Bettini, Josef Strauss, A. Meneguzzo, G. Arnison, A. Di Ciaccio, B. Aubert, Nicolas Ellis, A. Kernan, S. Centro, H. F. Hoffmann, M. De Giorgi, J. Eansdell, J. P. Lees, Michael Levi, Konstanty Sumorok, J. P. Porte, M. Demoulin, G. Grayer, C. Roberts, Ludwik Dobrzynski, T. C. Meyer, E. Tscheslog, G. Cox, J. Dorenbosch, D. Pascoli, T. P. Shah, A. Honma, A. Lévêque, I. Sheer, Sergio Cittolin, Daniel Denegri, Tim Martin, W. Haynes, E. K. Bock, C. Rubbia, H. von der Schmitt, P. Colas, P. Cennini, P. Catz, R. J. Homer, C. Bacci, D. Dallman, D. Schinzel, J. Streets, C. Ghesquière, J. R. Batley, P. Flynn, R. Eaja, B. Mours, G. Thompson, Alain Givernaud, A. Placci, J. Vrana, W. G. Scott, Y. Giraud-Heraud, I. Wlngerter, J. P. Revol, E. Buckley, N. Zaganidis, G. Maurin, Michael Albrow, M. Yvert, V. Vuillemin, M. Mohammadi, G. Salvini, T. Redelberger, W. Guryn, Charling Tao, A. Nandi, F. Szoncso, E. Frey, A. Savoy-Navarro, J. D. Dowell, M. Della Negra, E. Edgecock, M. Corden, M. Goodman, Jorma Tuominiemi, B. Denby, H. D. Wahl, D. Pitman, B. Van Eijk, C. Cochet, J. Colas, Peter Watkins, S. Levegrün, J. Garvey, J. P. Laugier, A. Schwartz, Ian Richard Kenyon, T. Wyatt, Felicitas Pauss, Filippo Ceradini, A. Norton, G. Piano Mortari, Claudia J. Stubenrauch, A. Gonidec, K. Morgan, Paul Kyberd, W. von Schlippe, D. Kryn, M. Markytan, E. Pietarinen, E. Eisenhandler, A. Astbury, M. N. Minard, D. Linglin, H. Grassmann, L. Naumann, E. Eadermacher, D.H. Smith, G. Sajot, Ehud Duchovni, J. Sass, O. C. Allkofer, L. Zanello, L. Paoluzi, Paolo Rossi, E. Kinnunen, S. Winpenny, M. Moricca, Th. Müller, W. Jank, Tejinder Virdee, Francesco Lacava, C. Perault, J. P. Mendiburu, S. Geer, James Rohlf, and R. Wilke
Subjects: Physics, Particle physics, Large Hadron Collider, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, General Physics and Astronomy, Low Energy Ion Ring, Jet (particle physics), Super Proton Synchrotron, law.invention, Nuclear physics, law, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment, Collider, Particle Physics - Experiment
Abstract: The production properties of a sample of 172 charged intermediate vector bosons produced at the CERN Super Proton Synchrotron Collider are described. The production cross-section, the longitudinal- and transverse-momentum distributions and the properties of hadronic jet activity produced in association with the weak bosons are in agreement with the expectations of the QCD-improved Drell-Yan mechanism.
Published: 1985

45. Low mass dimuon 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. Karimäki, R. Keeler, I. Kenyon, A. Kernan, A. Khan, W. Kienzle, R. Kinnunen, M. Krammer, J. Kroll, D. Kryn, F. Lacava, S. Lammel, 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. Moulin, B. Mours, Th. Muller, L. Naumann, P. Nedelec, A. Nisati, A. Norton, F. Pauss, C. Perault, E. Petrolo, G. Piano Mortari, E. Pietarinen, C. Pigot, M. Pimiä, A. Placci, J.-P. Porte, M. Preischl, E. Radermacher, T. Redelberger, H. Reitheler, 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, 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. Wulz, 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, Meson, Branching fraction, Nuclear Theory, High Energy Physics::Phenomenology, law.invention, Nuclear physics, Antiproton, law, High Energy Physics::Experiment, Nuclear Experiment, Collider, Particle Physics - Experiment
Abstract: We present a study of low mass dimuon events [m(μμ) < 6 GeV/c2] from the UA1 experiment at the CERN pp collider. Contributions from semileptonic decays of heavy flavour particles, Drell-Yan type processes, J/ψ decays and leptonic decays of light mesons are extracted, and cross sections for high pT beauty and Drell-Yan production are derived. A limit for the branching fraction for the exotic decay B0→μ+μ− is also obtained. The cross section for section for low mass, high pT Drell-Yan prod uction is compared to the measured direct photon cross section using QED and QCD derived relationship. This relationship is used to infer a measurement of the single photon cross section at lower values of transverse momentum, where photons cannot be unambigously identified.
Published: 1988

46. 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

47. Observation of wrong-sign tri-muon events in 250 GeV muon-nucleon interactions

Author: M. Whalley, W. Stockhausen, H. Minssieux, P. Dalpiaz, M. Villers, P.F. Dalpiaz, Jennifer S. Haas, L. Urban, P. Payre, E. Böhm, J. J. Aubert, M. Leenen, Joshua Thompson, Cristiana Peroni, Claus Gössling, X. De Bouard, M. Schneegans, J. H. Cobb, J. M. Crespo, W. Mohr, E. Gabathuler, Klaus Hamacher, M.I. Ferrero, F.W. Brasse, R. W. Clifft, M. Henckes, V. Gerhardt, L. Massonnet, W.S.C. Williams, D. Williams, C. Broll, F. Combley, J.G. Williamson, A.M. Osborne, V. Korbel, W. Flauger, T. J. Sloan, J. Drees, Ulrich Landgraf, Richard Mount, J. Carr, S. C. Brown, G. Bassompierre, H. Pessard, P.J. Hayman, Y. Declais, R.W. Dobinson, G. Coignet, K.H. Becks, J. McNicholas, M. C. Edwards, R. Gamet, W. D. Dau, Stephen Wimpenny, K. Rith, U. Dosselli, G. D'Agostini, H. E. Stier, P. Gregory, H. Wahlen, J. K. Davies, C. Best, H.E. Montgomery, J. Gayler, J. Favier, K. Moser, Uwe Pietrzyk, A. W. Edwards, J.M. Thenard, P. Ghez, P. R. Norton, and M. Maire
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Pair production, Muon, Hadron, Charm (quantum number), Nucleon, Event (particle physics), Mixing (physics), Particle Physics - Experiment, Sign (mathematics)
Abstract: Two trimuon events of the type μ+N→μ+μ+μ+X and one μ+N→μ+μ−μ−X have been observed in 250 GeV μ+ -iron interactions. The expected rate from the decay of hadrons (charm, π, K) is about one event. Other processes that may contribute are both beauty production and charm production with D0−D0 mixing. The data give upper limits of 12×10−36 cm2 for the cross section of beauty pair production by muons, and 20% for D0 ↔ D0 transitions due to mixing, both at 90% confidence level.
Published: 1981

48. Quark charge retention in final state hadrons from deep inelastic muon scattering

Author: H. E. Stier, Claus Goessling, C. Broll, Ph. Heusse, F. W. Brasse, M. Jaffre, F. Dengler, Cristiana Peroni, Roland Windmolders, C. Hoppe, H.E. Montgomery, J. Shiers, Hans Calén, A. Arvidson, F. G. Oakham, J.J. Dumont, J. Gayler, N. Schmitz, K. Schultze, I. G. Bird, G. Kellner, Stephen Wimpenny, G. Coignet, D. Lanske, A. S. Johnson, W.S.C. Williams, P. Payre, Jozsef Toth, M. Edwards, F. Janata, P. Zank, E. Nagy, J. Foster, M. Poetsch, Jennifer S. Haas, H. Preissner, S. Dahlgren, L. Urban, H. Pessard, L. Gustafsson, K. Rith, A. Jacholkowska, S.C. Brown, N. Geddes, Ulrich Landgraf, R. W. Clifft, Richard Mount, V. Korbel, E. Rondio, J. G. Loken, Paolo Giubellino, E. M. Kabuss, Christopher Bee, I. Derado, J. Favier, F. Combley, M. Maire, J. Pettingale, J.K. Davies, P. B. Renton, W. Flauger, C. Benchouk, F. Montanet, D. Blum, Jane Coughlan, J. S. Chima, M.I. Ferrero, C. Pascaud, W. Mohr, K.H. Becks, M. Dueren, W. Stockhausen, Michele Arneodo, H. Wahlen, H. Brueck, Jc Thompson, F.J. Hasert, J.M. Thenard, M. Schneegans, A.M. Osborne, S. Kullander, B. Poensgen, V. Eckardt, T. J. Sloan, P. Ribarics, T. Schroeder, P. R. Norton, W. Wallucks, Kr Long, J.P. Albanese, G. Jancso, J. Carr, T. Ernst, F. Grard, E. Hagberg, J. Krueger, J. Drees, J.H. Cobb, H. M. Braun, M. Whalley, J. J. Aubert, Gy. Wolf, A. Schlagboehmer, G.R. Court, A. Manz, U. Dosseli, X. De Bouard, E. Gabathuler, Geoffrey Taylor, T. Dreyer, L. Paul, J. Figiel, G. Eszes, S. Wheeler, J. Nassalski, R.W. Dobinson, A. Edwards, P.J. Hayman, D. Callebaut, E. Boehm, W. D. Dau, A. de la Torre, M. Studt, R. Gamet, P. Grafstroem, and G. D'Agostini
Subjects: Physics, Quark, Nuclear and High Energy Physics, Particle physics, Muon, Valence (chemistry), Scattering, Hadron, High Energy Physics::Phenomenology, Nuclear Theory, Parton, Nuclear physics, Rapidity, High Energy Physics::Experiment, Nuclear Experiment, Charge retention, Particle Physics - Experiment
Abstract: The net charge of final state hadrons in both the current and target fragmentation regions has been measured in 280 GeV/ c muon-proton scattering experiment. A clean kinematic separation of the two regions in the centre-of-mass rapidity is demonstrated. The dependence on x Bj of the mean net charges is found to be consistent with a large contribution of sea quarks at small x Bj and with the dominance of valence quarks at large x Bj thus giving clear confirmation of the quarck- parton model. It is also shown that the lending forward hadron has a high probability of containing the struck quark.
Published: 1984

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