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34 results on '"D. Dau"'

1. Bayesian Analysis of the Sudanese Immigrant Youth Crime Rates and the 'Likelihood' of Committing Violent Offence than an Australian-Born

Author

Atemthii D. Dau

Subjects
Cultural Studies, Prison population, Sociology and Political Science, media_common.quotation_subject, Immigration, Bayesian probability, Ethnic group, Criminology, Australian population, State (polity), Perception, Sociology, Law, Immigrant population, media_common
Abstract

This paper presents a mixed method of inquiry into most of the public notions, shaping the Sudanese immigrant community’s perception Australia wide. Firstly, a qualitative review regarding two remarks by Australian public figures will be considered and analyzed; and secondly, Bayesian analysis (BA) will be considered to analyze the randomness of the crimes: BA, is a highly predictive methodological tool used in a wide range of applications. For example, in predicting of crimes based on prior occurrences of an offence or groups of offences. Thus, the Bayesian analysis considers the hypothesized relationship between ‘Ethnicity and Criminality’; the emphasis is on the recorded Crime figures involving immigrant youth of the Sudanese-born residing in the state of Victoria. The figures are drawn mainly from the Australian statistical agencies and media sources; the Australian Bureau of Statistics (ABS), media reports, community’s prison population (CPP) and the overall Sudanese immigrant population in Australia (SIPA); comparative considerations with the overall Australian population (APP) and the Australian-born prison population (ABPP) from the years 2006 to 2007 will be looked into. The study concludes by suggesting the policy implication of this findings and future research directions.

Published
2015

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. 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

11. 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

12. 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

13. 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

14. 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

15. 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

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

Author

Hans Reithler, H. Bohn, P. Cennini, Christian Ghiglino, E. F. Clayton, W. G. Scott, M. Jimack, Alain Givernaud, C.-E. Wulz, M. Schröder, Sergio Cittolin, I. ten Have, G. Sajot, D. Kryn, I. F. Fensome, F. J. Diez Hedo, Steve McMahon, Anton Taurok, Emilio Petrolo, T. Moers, J. P. Porte, J. Vrana, R. Conte, M. Yvert, T. Bacon, G. Walzel, K. Morgan, H. Faissner, R. Leuchs, L. Zanello, R. Prosi, F. Szoncso, L. Taylor, D. Samyn, A. Astbury, E. Tscheslog, Daniel J. Smith, P. Nedelec, N. Bains, Teresa Rodrigo, Akram Khan, P. Colas, G. Maurin, M. Markytan, W. van de Guchte, M. Pimiä, J. D. Dowell, A. Moulin, K. Ankoviak, David B. Cline, Dave Robinson, L. Dobrzynksi, V. O'Dell, P. I. P. Kalmus, J. P. Mendiburu, A. Placci, A. van Dijk, Paraskevas Sphicas, H. G. Moser, S. Tether, Murrough Landon, Nicolas Ellis, P. Biddulph, Anna Teresa Meneguzzo, Dave Charlton, D. Schinzel, C. Bacci, S. Beingessner, M. Botlo, A. Schwartz, I. Siotis, G. Bauer, A. Bezaguet, A. Ferrando, G. Ciapetti, John A Coughlan, G. Cox, Stefano Veneziano, L. Fortson, B. Buschbeck, J.P. Vialle, M. Nikitas, W.J. Haynes, T. C. Meyer, D. J. Holthuizen, R. K. Keeler, K. Bos, J. Dorenbosch, E. Radermacher, B. Aubert, Alessandro Bettini, Michael Albrow, Ritva Kinnunen, D. Linglin, Carmen Albajar, A. Caner, J. P. Revol, O. C. Allkofer, Th. Müller, G. Thompson, H. Dibon, B. Mours, I. Zacharov, V. Vuillemin, W. Jank, G. Pancheri, P. Casoli, G. Busetto, J. Colas, K. Wacker, I. Wingerter, Peter Lipa, S. Centro, J. P. Debrion, M. Mohammadi, Christopher Seez, B. Andrieu, M. Demoulin, Manfred Krammer, A. Geiser, Konstanty Sumorok, K. Eggert, Jean-Pierre Merlo, Veikko Karimäki, M. Lindgren, A. Norton, T. Redelberger, C. Rubbia, F. Cavanna, D. Dau, M. Della Negra, S. Geer, G. Jorat, P. Erhard, A. Kernan, G. Piano Mortari, I. R. Kenyon, Jonathan M. Gregory, A. Böhrer, Pierluigi Zotto, S. Levegrün, R. Apsimon, Y. Giraud-Héraud, M. Preischl, E. Pietarinen, Daniel Denegri, A. Diciaccio, X. Wu, Jorma Tuominiemi, Claudia J. Stubenrauch, S. Lammel, A. Gonidec, G. Salvini, T. P. Shah, W. Kienzle, C. Markou, J. Sass, R. Bonino, T. Feuss, Margret Fincke-Keeler, Aleandro Nisati, J. Garvey, E. Eisenhandler, Felicitas Pauss, M. Ikeda, Filippo Ceradini, J. Kroll, M. A. Marquina, James Rohlf, W. von Schlippe, Tejinder Virdee, Francesco Lacava, C. Zaccardelli, D. Joyce, L. Naumann, and M. Degiorgi

Subjects
Physics, Nuclear and High Energy Physics, Interaction model, Bose–Einstein correlations, Charged particle, law.invention, Nuclear physics, law, Pseudorapidity, Particle, High Energy Physics::Experiment, Angular dependence, Collider, Constant (mathematics)
Abstract

Bose-Einstein correlations have been measured at the SPS collider at centre-of-mass energies from √ s =0.2 to 0.9 TeV. The size and the incoherence parameter of the particle emitting region have been determined as a function of charged particle density in pseudorapidity Δ n /Δη, centre-of-mass energy and the direction of emission of the charged particles. For fixed values of Δ n /Δη the size of the interaction region and the incoherence parameter remain constant with rising √ s . At fixed √ s , the size of the interaction region increases with rising charged particle density while the incoherence parameter decreases.

Published
1989

17. 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

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

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Stop squark, Gluino, Particle physics, Large Hadron Collider, High Energy Physics::Phenomenology, Lightest Supersymmetric Particle, law.invention, Nuclear physics, Massless particle, law, High Energy Physics::Experiment, Limit (mathematics), Nuclear Experiment, Collider, Photino
Abstract

A sample of events with large missing transverse energy from 715 nb −1 of data from the UA1 experiment at the CERN proton-antiproton collider is used to search for evidence of supersymmetric particle production. Assuming that the photino is the lightest supersymmetric particle and that it is massless, we find a limit on the squark mass of m q >45 GeV /c 2 at 90% CL, independently of the gluino mass. Similarly, we find a limit on the gluino mass of m g >53 GeV /c 2 (at 90% CL) independently of the squark mass, provided that the gluino is not long-lived (i.e. provided that the squark is not too heavy, m q ⪅1 TeV /c 2 ). For equal squark and gluino masses we find a limit m q =m g >75 GeV /c 2 at 90% CL. The effect of a non-zero photino mass on these limits is studied.

Published
1987

19. 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

20. 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

21. 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

22. 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

23. The kiel cosmic ray muon spectograph

Author

O.C. Allkofer, M. Weinert, E. Kraft, W. Heinrich, W. D. Dau, and K. Carstensen

Subjects
Physics, Muon, Spectrometer, Astrophysics::High Energy Astrophysical Phenomena, Solid angle, Cosmic ray, General Medicine, Astrophysics, Spectral line, law.invention, Magnetic field, Telescope, Nuclear physics, law, Scintillation counter
Abstract

A cosmic ray magnetic spectograph for measurements of muon spectra and charge ratio at sea level in the high energy region has been constructed. This spectograph can be turned in a continuous way from a vertical to a horizontal position. The solid angle of the spectograph is defined by a telescope of four scintillation counters, the deflection of the muons takes place in a solid iron magnet, and the tracks are indicated by six double gap spark chambers which are photographed. The acceptance of the apparatus amounts to 15.8 cm 2 sr. The geometrical acceptance half-angle is 5.2° in the deflection plane as well as in the perpendicular plane. The lowest momentum that can be measured with the apparatus is 7 GeV/ c and the maximum detectable momentum is about 1 TeV/ c .

Published
1970

24. 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

25. 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

26. 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

27. Transcutaneous Oxygen Pressure Measurements with an Electrode Core Temperature of 37 °C

Author

A. Creutzig, K. Alexander, and D. Dau

Subjects
Pressure measurement, Materials science, integumentary system, law, Electrode, Analytical chemistry, Occlusive disease, Blood flow, Transcutaneous oxygen, Core temperature, Oxygen pressure, Reactive hyperemia, law.invention
Abstract

The oxygen pressure of the healthy skin fluctuates between 0 and 4 mm Hg [5]. The application of hyperemizating ointment or heat causes skin oxygen pressure to rise; maximum hyperemia results at temperatures above 40 °C, while the blood flow remains constant [8]. A further increase in blood flow, such as one induced by drugs, cannot be expected, just as a reactive hyperemia cannot be measured. In earlier investigations, a uniform decline in tcPO2 was observed when an electrode was used at 44 °C in patients with arterial occlusive disease under an intra-arterial infusion of various drugs. This we interpreted as a steal phenomenon [2]. If, however, electrode core temperatures between 37 °C and 39 °C are selected, changes in the cutaneous blood flow can be detected [6]. In the following, the results of tcPO2 investigations using an electrode core temperature of 37 °C are reported.

Published
1987

28. 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

29. 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

30. 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

31. 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

32. 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

33. 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

34. 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

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