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31 results on '"UA1 experiment"'

2. Inclusive production of strange particles in collisions at with UA1

Author

H. Dibon, B. Buschbeck, C.H. Tan, J. P. Revol, Carmen Albajar, S. Tether, P. Sphicas, H.Q. Wang, M. Markytan, Peter Lipa, Veikko Karimäki, G. Bocquet, N. Neumeister, Ritva Kinnunen, A. Norton, Jorma Tuominiemi, Konstanty Sumorok, and M. Pimiä

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Minimum bias, High Energy Physics::Experiment, Rapidity, Multiplicity (chemistry), Nuclear Experiment, Lambda, Charged particle, UA1 experiment
Abstract

We have analysed a sample of 2.36 million minimum bias events produced in p p collisions at s =630 GeV in the UA1 experiment at the CERN Sp p S collider. We have studied the production of K S 0 , Λ and Λ particles with transverse momenta ( p t ) up to 7 GeV/c and K ± up to 2 GeV/c. The kaon data are compared with a recent QCD prediction and are found to be in good agreement. The p t > for K S 0 , Λ and Λ is seen to increase as a function of the charged particle multiplicity and is compared with charged particle production.

Published
1996
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3. Hunting for CDF Multi-Muon 'Ghost' Events at Collider and Fixed-Target Experiments

Author

Nicki Bornhauser and Manuel Drees

Subjects
Physics, SIMPLE (dark matter experiment), Particle physics, Muon, Large Hadron Collider, Physics and Astronomy (miscellaneous), FOS: Physical sciences, Resonance (particle physics), UA1 experiment, law.invention, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), law, Physics::Accelerator Physics, High Energy Physics::Experiment, Fermilab, Collider, Engineering (miscellaneous), Beam (structure)
Abstract

In 2008 the CDF collaboration discovered a large excess of events containing two or more muons, at least one of which seemed to have been produced outside the beam pipe. We investigate whether similar "ghost" events could (and should) have been seen in already completed experiments. The CDF di-muon data can be reproduced by a simple model where a relatively light X particle undergoes four-body decay. This model predicts a large number of ghost events in Fermilab fixed-target experiments E772, E789 and E866, applying the cuts optimized for analyses of Drell-Yan events. A correct description of events with more than two muons requires a more complicated model, where two X particles are produced from a very broad resonance Y. This model can be tested in fixed-target experiments only if the cut on the angles, or rapidities, of the muons can be relaxed. Either way, the UA1 experiment at the CERN ppbar collider should have observed O(100) ghost events., 15 pages, 9 figures

Published
2010

4. Shielding design of an underground experimental area at point 5 of the CERN Super Proton Synchrotron (SPS)

Author

Mario J. Mueller and Graham R. Stevenson

Subjects
Radiation, Radiation Dosage, Risk Assessment, Nuclear physics, Radiation Protection, Radiation Monitoring, Risk Factors, Shield, Radiology, Nuclear Medicine and imaging, Computer Simulation, Physics, Neutrons, Large Hadron Collider, Radiological and Ultrasound Technology, Research, Public Health, Environmental and Occupational Health, General Medicine, Equipment Design, Models, Theoretical, Super Proton Synchrotron, UA1 experiment, Equipment Failure Analysis, W and Z bosons, Facility Design and Construction, Electromagnetic shielding, Computer-Aided Design, Particle Accelerators, Protons, Beam (structure), Switzerland, Synchrotrons
Abstract

Increasing projected values of the circulating beam intensity in the Super Proton Synchrotron (SPS) and decreasing limits to radiation exposure, taken with the increasing non-acceptance of unjustified and unoptimised radiation exposures, have led to the need to re-assess the shielding between the ECX and ECA5 underground experimental areas of the SPS. Twenty years ago, these experimental areas at SPS-Point 5 housed the UA1 experiment, where Carlo Rubbia and his team verified the existence of W and Z bosons. The study reported here describes such a re-assessment based on simulations using the multi-purpose FLUKA radiation transport code. This study concludes that while the main shield which is made of concrete blocks and is 4.8 m thick satisfactorily meets the current design limits even at the highest intensities presently planned for the SPS, dose rates calculated for liaison areas on both sides of the main shield significantly exceed the design limits. Possible ways of improving the shielding situation are discussed.

Published
2005

6. Optical data link for the U-TMP calorimeter of the UA1 experiment at CERN

Author

P. Cennini, E. Petrolo, and Z. Kulka

Subjects
Physics, Nuclear and High Energy Physics, 3D optical data storage, Optical fiber, Large Hadron Collider, Calorimeter (particle physics), Physics::Instrumentation and Detectors, business.industry, Digital data, UA1 experiment, law.invention, Optics, Transmission (telecommunications), law, High Energy Physics::Experiment, Nuclear Experiment, business, Instrumentation
Abstract

This article describes a system using optical fibers for the digital data transmission between the UA1 uranium-TMP calorimeter in the SPS tunnel at CERN and the control room located outside the experimental area at a distance exceeding 140 m.

Published
1989
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7. THE UA1 EXPERIMENT

Author

Charling Tao

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Bibliography, Astronomy and Astrophysics, Atomic and Molecular Physics, and Optics, UA1 experiment, Particle identification
Published
1986
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8. Central hadron calorimeter of UA1

Author

G.T.J. Arnison, K.C.T.O. Sumorok, I. R. Kenyon, T. J. V. Bowcock, M.J. Corden, R.J. Stanhope, Nicolas Ellis, M.D. Percival, T. McMahon, D.R. Moore, A.R. Cash, Peter Watkins, P.I.P. Kalmus, M Edwards, G.H. Grayer, G. Thompson, A. Bezaguet, W.J. Haynes, W. G. Scott, John Wilson, Derek L. G. Hill, J. D. Dowell, G. Salvi, J. Garvey, Asoke K. Nandi, G. Gallay, G Schanz, J.H.C. Roberts, T.W. Pritchard, R. J. Homer, D. White, E. Eisenhandler, W.R. Gibson, D. Grant, A. Honma, G. Barnes, T. P. Shah, A. Astbury, and R.K. Keller

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Calorimeter (particle physics), Physics::Instrumentation and Detectors, Instrumentation, Hadron, UA1 experiment, law.invention, Nuclear physics, law, Magnet, Calibration, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment, Collider
Abstract

An iron—scintillator sampling calorimeter is described, which measures hadronic energy in proton-antiproton interactions at the CERN 540 GeV SPS collider. Construction details are given of the instrumentation of the magnet pieces of the UA1 experiment and of the methods used to measure the calorimeter response and resolution. The system of lasers and quartz fibres, which allows long term monitoring of the calorimeter response, is also described.

Published
1985
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9. The UA1 calorimeter trigger

Author

Richard Keeler, W.J. Haynes, Nicolas Ellis, G. Salvi, G.H. Grayer, J. Garvey, A. Honma, G. Mcpherson, W.R. Gibson, D. Grant, E. Eisenhandler, R. J. Homer, T. Bowcock, R. Batley, A. Astbury, D.N. Wilson, T. McMahon, M. Cawthraw, Asoke K. Nandi, and R.L. English

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Calorimeter (particle physics), Physics::Instrumentation and Detectors, Electron, Scintillator, UA1 experiment, law.invention, Nuclear physics, Transverse plane, law, High Energy Physics::Experiment, Nuclear Experiment, Collider, Instrumentation, Energy (signal processing)
Abstract

We describe the design, construction and performance of the fast calorimeter trigger used in the UA1 experiment on the CERN p p collider. Calorimeter energy signals are digitized rapidly and used to trigger on possible electrons, hadronic jets, total transverse energy and missing transverse energy, with many possible options. We also describe the minimum-bias pretrigger, based on scintillator hodoscopes.

Published
1985
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11. Constraints on squark masses from CERN collider data

Author

Vernon Barger, Kaoru Hagiwara, and Wai-Yee Keung

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Stop squark, Gluino, Large Hadron Collider, UA1 experiment, Lower limit, law.invention, Nuclear physics, law, Limit (mathematics), Collider, Photino
Abstract

If the gluino is heavier than the squark and the photino mass is negligible, produced squark decay via q → γ q . Taking missing-pT events observed in the UA1 experiment as an upper limit due to this source, a squark mass bound of m q ≳40 GeV for m g = 2m q is placed. The possibility that the observed events could be of this origin is also addressed.

Published
1984
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12. Linearity and stability tests of photomultipliers with two-stage amplifiers for the electromagnetic calorimeter of the UA1-experiment

Author

Ch. Gottfried, G. Kulik, M. Pernicka, and M. Regler

Subjects
Physics, Photomultiplier, Large Hadron Collider, Physics::Instrumentation and Detectors, business.industry, Amplifier, General Engineering, Linearity, Electron, Stability (probability), UA1 experiment, law.invention, Optics, law, Physics::Accelerator Physics, Collider, business
Abstract

For the central electron and photon detector of the UA1-experiment at the CERN proton-antiproton collider the behaviour of 850 photomultipliers together with high gain amplifiers had to be tested. For this purpose three CAMAC-controlled test boxes have been built: one to test the long term behaviour at constant and different illuminations, another one to test the amplifiers and a third one to check the linearity of the assembled system and the variation of gain after different illuminations.

Published
1982
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13. Jet fragmentation into charged particles at the CERN proton-antiproton collider

Author

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

Subjects
Physics, Quark, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Super Proton Synchrotron, Charged particle, UA1 experiment, Hadronization, Gluon, Nuclear physics, Antiproton, High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment
Abstract

Inclusive fragmentation of jets into charged particles has been studied in the UA1 experiment at the CERN Super Proton Synchrotron (SPS) pp Collider at s = 540 GeV for jets having a transverse energy above 30 GeV. The observed fragmentation function is very similar to that seen in e+e−jets and is therefore indicative of similar hadronization processes for gluons and quarks. Scaling with the energy of the jet is valid to a good approximation, although slight deviations are suggested by the data. The average transverse momentum with respect to the jet axis for jets with ET > 30 GeV is 600 MeV/c for particles having z > 0.1 and increases slowly with the jet energy.

Published
1983
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14. Use of a data base in the on-line environment of a large-scale high-energy physics experiment

Author

A. Savoy-Navarro

Subjects
Large Hadron Collider, Scale (ratio), Hardware and Architecture, Computer science, law, Line (geometry), Electronic engineering, General Physics and Astronomy, Detectors and Experimental Techniques, Collider, Base (topology), UA1 experiment, law.invention
Abstract

Here we report our experience in building a data base (DB) inserted in the on-line system of the UA1 experiment at the CERN p p Collider. The main requirements that such a DB must fulfil as well as its main possible uses are described, and we explain how this has been handled. The problems encountered, and which should be avoided, are discussed, and some solutions for the future experiments around the next-generation accelerators are proposed.

Published
1984
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15. Evidence for the t-quark in collider data?

Author

Alan D. Martin, Vernon Barger, and R.J.N. Phillips

Subjects
Physics, Nuclear and High Energy Physics, Top quark, Particle physics, SIMPLE (dark matter experiment), Muon, Large Hadron Collider, Electron, UA1 experiment, law.invention, Nuclear physics, law, Transverse mass, High Energy Physics::Experiment, Nuclear Experiment, Collider
Abstract

We propose a simple method to identify semileptonic weak decays t→eνb of any heavy particle t and to determine its mass independent of the t-production mechanism, using p p collider events that contain a single electron (or muon) and missing transverse momentum. Events with transverse mass M T (e ν ) > 3 GeV originate either from t-decays of mass m t > M T (e ν ) + m b or from W→eν decays; the latter is a distinctive background that can be subtracted. The M T (e ν ) distribution of electron events with jets recently observed in the UA1 experiment at CERN may be interpreted as being due to a t-quark with mass 25 to 40 GeV.

Published
1983
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16. Analysis of the fragmentation properties of quark and gluon jets at the CERN SPS pp̄ collider

Author

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

Subjects
Quark, Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Hadron, UA1 experiment, Photon structure function, Gluon, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment, Scaling, Particle Physics - Experiment
Abstract

A sample of two-jet events from the UA1 experiment at the CERN pp Collider has been used to study the fragmentation of high-energy quark and gluon jets into charged hadrons. Compared with lower-energy jets observed in e + e − and pp collisions, the fragmentation function measured in the present experiment is softer (i.e. peaked to smaller values of z ) and the mean internal transverse momentum is larger, mainly because of the effects of the QCD scaling violations. Using our knowledge of the quark and gluon structure functions in the proton, together with the QCD matrix elements, a statistical separation of quark and gluon jets is achieved within the present experiment. The fragmentation function for the gluon jets is found to be softer, and the angular spread of the fragmentation products larger, than is the case for quark jets.

Published
1986
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18. Forward calorimetry in the upgraded UA1 experiment

Author

F.J. Alvarez-Taviel, V. Vuillemin, C. Bacci, P. Doncel, A. Ferrando, Alain Givernaud, C. Rubbia, A. Tusi, F. Diez-Hedo, E. Petrolo, M. A. Marquina, and T. Rodrigo

Subjects
Physics, Nuclear and High Energy Physics, Nuclear magnetic resonance, Missing energy, Optics, Luminosity (scattering theory), business.industry, Ionization, Calorimetry, Detectors and Experimental Techniques, business, Instrumentation, UA1 experiment
Abstract

The major improvement in the upgraded UA1 calorimetry at the SppS is the general use of ionization chambers filled with tetramethylpentane (TMP) as a detection medium interspersed with uranium plates as absorber. To achieve overall uniformity of detection down to very small angles, an identical solution is proposed for the forward calorimetry. Forward calorimetry is essential for good total and missing energy measurement at high luminosity in view of the increasing rate of multiple collisions. Both designs for forward and very forward calorimeters are presented along with expected resolutions.

Published
1988

19. First Results of the UA1 Experiment

Author

M. Pimiä

Subjects
Physics, Particle physics, Large Hadron Collider, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, 7. Clean energy, UA1 experiment, law.invention, Luminosity, Minimum bias, law, 0103 physical sciences, Transverse momentum, 010306 general physics, 0210 nano-technology, Collider, Multiplicity distribution
Abstract

The CERN SPS proton-antiproton collider had several short machine development and physics runs during autumn 1981. Figure 1 shows the luminosity achieved during the runs in December 1981. The peak luminosity was 5*1027 cm−2 s−1, still far from the design value of 1030 cm−2 s−1. For the November and December runs the integrated luminosity amounted to $$ \int{L}=1.8*{{10}^{32}}c{{m}^{-2}} $$ (1) .

Published
1983
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20. Events with large missing transverse energy at the cern collider: I.W→τν decay and test of τμe universality at Q2=mw2

Author

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

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Transverse plane, Particle physics, Large Hadron Collider, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Nuclear Experiment, UA1 experiment, Universality (dynamical systems)
Abstract

We report results based on a sample of events with large missing transverse energy corresponding to 715 nb−n of data from the UA1 experiment at the CERN proton-antiproton collider. High transverse-momentum tau-leptons from W decays are observed for the first time through their semi-hadronic decay modes and associated missing transverse energy. The measured relative rates of W→eν, W→μν, and W→τν provide the first direct tests of the electron-muon-tau universality of the weak charged couplings at Q2=mw2. We determine g τ g e =1.01±0.09±0.05 and g μ g e =1.05±0.07±0.08 .

Published
1987

21. 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

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

Author

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

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Top quark, Particle physics, Muon, Large Hadron Collider, Electron, Neutrino, Super Proton Synchrotron, UA1 experiment, Particle Physics - Experiment, Vector boson
Abstract

We present updated results from the UA1 experiment on cross sections times leptonic branching ratios for intermediate vector bosons produced in proton-antiproton collisions at a centre-of-mass energy of 0.630 TeV. We find that σ·B( W → l βn)=0.63±0.04±0.10 nb and σ·B( Z 0 → l + l − =0.071±0.011 nb where l denotes an average of electron and muon channels. An average over all data (electron and muon channels at 0.546 and 0.630 TeV) gives a ratio of R≡σ·( W → l ν)/σ·B( Z 0 → l + l − ) = 9.1 +1.7 −1.2 . Using current theoretical predictions for this quantity, limits are extracted on the number of light neutrino types. Combining UA1 and UA2 data and imposing the bound N ν ⩾3 we find that N ν ⩽5.9 at 90% CL. Constraints on the mass of the top quark are also discussed.

Published
1987

23. 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

24. 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

25. Proposal to the Department of Energy for participation in the UA1 experiment

Author

J.W. Rohlf

Subjects
Physics, Large Hadron Collider, Physics::Instrumentation and Detectors, business.industry, Detector, UA1 experiment, law.invention, Nuclear physics, Upgrade, law, Antiproton, Position detector, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment, Collider, Telecommunications, business
Abstract

This proposal is to the Department of Energy for 501.6K dollars (349.6K operations and 152K equipment) for continued participation in the UA1 experiment on proton-antiproton collisions. The UA1 experiment is the study of high-energy proton-antiproton collisions in the Super-Proton-synchrotron (SPS) Collider at CERN. A major upgrade of the UA1 detector is in progress for operation with the upgraded antiproton source (ACOL). The US groups have played an increasingly prominent role in UA1 during the past few years. This paper discusses the data analysis that has been done by the group of the position detector and it's hardware.

Published
1988
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26. BEAUTY PRODUCTION AT THE CERN PROTON-ANTIPROTON COLLIDER

Author

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

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Muon, media_common.quotation_subject, UA1 experiment, Nuclear physics, Angular distribution, Antiproton, Beauty, High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment, media_common
Abstract

We report evidence for beauty particle production through the observation of dimuon events from proton-antiproton collisions at energies of √s=546 GeV and √s=630 GeV at the CERN collider. Our data indicate that semi-leptonic decays of beauty particles are the dominant source of pairs of high-pT muons. The beauty flavour creation (gg or q¯q→b¯b) cross-section needed to explain the dimuon rate is σ{p¯p→b¯b+X, pbT5 GeV/c, |η

Published
1987

27. Harvard participation in the UA1 experiment

Author

J.W. Rohlf

Subjects
Nuclear physics, Physics, Particle physics, Particle decay, Missing energy, Measuring instrument, Physics::Accelerator Physics, High Energy Physics::Experiment, Elementary particle, Nuclear Experiment, UA1 experiment, Particle detector, Boson
Abstract

This report is a renewal proposal to continue Harvard`s participation in the UA1 experiment on proton-antiproton collisions. The proposed activity emphasizes events with large missing energy and W and Z neutral decays. (LSP)

Published
1985
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28. Cross-sections of W’s, W pairs and the Higgs boson for the UA1 experiment at CERN

Author

R. Kinnunen

Subjects
Physics, Particle physics, Large Hadron Collider, Physics::Instrumentation and Detectors, High Energy Physics::Phenomenology, Elementary particle, UA1 experiment, law.invention, Nuclear physics, Particle decay, Pair production, law, Higgs boson, Physics::Accelerator Physics, High Energy Physics::Experiment, Collider, Boson
Abstract

The leptonic decay rates of W± and Z0 are calculated for the UA1 experiment at CERN. The production characteristics of W± and A0 are studied. Pair production of W’s and the production of the Higgs boson at the energy of the CERN pp collider are also briefly discussed.

Published
1982
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29. First operation of the CERN UA1 central detector

Author

Calvetti, M., Cennini, P., Centro, S., Cittolin, S., Dibitonto, D., Dumps, L., Haynes, W., Jank, W., Jorat, G., Karimaki, V., Kowalski, H., Lacava, Francesco, Markiewicz, T., Maurin, G., Norton, A., Piano Mortari, G., Pimia, M., Placci, A., Revol, J. P., Rijssenbeek, M., Rubbia, C., Sadoulet, B., Schinzel, D., Savoy Navarro, A., Sumorok, K., Timmer, J., Vuillemin, V., and Zurfluh, E.

Subjects
Physics, Nuclear and High Energy Physics, Large Hadron Collider, Physics::Instrumentation and Detectors, business.industry, Detector, Electrical engineering, Particle accelerator, UA1 experiment, Particle detector, law.invention, Nuclear Energy and Engineering, law, Measuring instrument, High Energy Physics::Experiment, Electronics, Electrical and Electronic Engineering, Detectors and Experimental Techniques, Collider, business
Abstract

The Central Detector of the UA1 experiment at the CERN proton-antiproton Collider underwent a first physics run at the end of 1981. The detector consists of a large drift chamber assembly (25 m3, ~ 6000 sense wires). An electronics readout with multi-hit capability simultaneously digitizes the time and the analog information used for charge division and energy measurement. The initial performance of the readout and control system will also be presented. The detector was tested in two cosmic-ray runs, and is now fully operational for the second physics run; this started at the beginning of October 1982.

Published
1982

30. Recent Results from the UA1 Experiment

Author

J. D. Dowell

Subjects
Quark, Physics, Coupling constant, Particle physics, Large Hadron Collider, UA1 experiment, law.invention, Nuclear physics, Upgrade, law, Antiproton Collector, Physics::Accelerator Physics, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Collider
Abstract

A number of results, obtained in the UA1 experiment before the upgrade of the proton-antiproton collider at CERN, are discussed. In most cases they are the final statements that can be made from the data, based on integrated luminosities of ~ 130 nb-1 at √s = 546 GeV recorded in 1983 and ~ 570 nb-1 at √s = 630 GeV in 1984 and 1985. Where appropriate, an indication of the improvement in precision to be expected with ACOL, the new antiproton collector, is given.

Published
1989
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