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1. MEASUREMENT OF JET PRODUCTION PROPERTIES AT THE CERN PBARP COLLIDER

Author

P. Bagnaia, M. Banner, R. Battiston, Ph. Bloch, K. Borer, M. Borghini, J. Bürger, P. Cenci, J.-C. Chollet, A.G. Clark, C. Conta, P. Darriulat, L. Di Lella, J. Dines-Hansen, R. Engelmann, L. Fayard, M. Fraternali, D. Froidevaux, J.-M. Gaillard, O. Gildemeister, V.G. Goggi, C. Gössling, B. Hahn, H. Hänni, J.R. Hansen, P. Hansen, N. Harnew, T. Himel, P. Jenni, O. Kofoed-Hansen, E. Lançon, M. Livan, S. Loucatos, B. Madsen, P. Mani, B. Mansoulié, G.C. Mantovani, L. Mapelli, B. Merkel, R. Mollerud, C. Onions, G. Parrour, F. Pastore, H. Plothow-Besch, M. Polverel, J.-P. Repellin, A. Rothenberg, A. Roussarie, G. Sauvage, J. Schacher, J.L. Siegrist, G. Stimpfl, F. Stocker, M. Swartz, J. Teiger, S. Tovey, V. Vercesi, A.R. Weidberg, H. Zaccone, J.A. Zakrzewski, and W. Zeller

Subjects
Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Jet production properties at s = 540 GeV have been measured in the UA2 detector at the CERN pp Collider. Results on the total transverse momentum of the jet system, on the parton density in the nucleon (structure function) and on the two-jet angular distributions are reported. The data are compared with QCD predictions and extrapolations from lower energy experiments. © 1984.

Published
2016
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2. A search for relativistic particles with fractional electric charge at the Cern collider

Author

M. Banner, Ph. Bloch, F. Bonaudi, K. Borer, M. Borghini, J.-C. Chollet, A.G. Clark, C. Conta, P. Darriulat, L. Di Lella, L. Dines-Hansen, P.-A. Dorsaz, L. Fayard, M. Fraternali, D. Froidevaux, J.-M. Gaillard, O. Gildemeister, V.G. Goggi, H. Grote, B. Hahn, H. Hänni, J.R. Hansen, P. Hansen, T. Himel, V. Hungerbühler, P. Jenni, O. Kofoed-Hansen, M. Livan, S. Loucatos, B. Madsen, P. Mani, B. Mansoulié, G.C. Mantovani, L. Mapelli, B. Merkel, M. Mermikides, R. Møllerud, C. Onions, G. Parrour, F. Pastore, H. Plothow-Besch, J.-P. Repellin, J. Ringel, A. Rothenberg, A. Roussarie, G. Sauvage, J. Schacher, J.L. Siegrist, F. Stocker, J. Teiger, V. Vercesi, H.H. Williams, H. Zaccone, and W. Zeller

Subjects
Nuclear and High Energy Physics
Published
1983
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3. A new search for relativistic particles with fractional electric charge at the CERN collider

Author

P. A. Dorsaz, Peter Jenni, H. Hänni, Valerio Vercesi, J. M. Gaillard, Daniel Froidevaux, G. Parrour, J. P. Repellin, H. Plothow-Besch, F. Stocker, G. Sauvage, T. Himel, Allan G Clark, P. Mani, J. C. Chollet, Fr. Pastore, A. F. Rothenberg, S. Loucatos, M. Borghini, M. Banner, O. Gildemeister, Marco Fraternali, Michele Livan, R. Mollerud, V.G. Goggi, W. Zeller, B. Madsen, Louis Fayard, C. Onions, John H. L. Hansen, H. Zaccone, C. Conta, K. Borer, B. Hahn, P. H. Hansen, P. Darriulat, J. Teiger, L. Di Lella, Livio Mapelli, J. Schacher, J. Dines-Hansen, A. Roussarie, J. L. Siegrist, B. Merkel, O. Kofoed-Hansen, Ph. Bloch, Giancarlo Mantovani, and B. Mansoulié

Subjects
Physics, Quark, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Charge (physics), Electric charge, Charged particle, law.invention, Relativistic particle, Nuclear physics, law, Ionization, Collider
Abstract

We report on a search for relativistic particles with fractional electric charge at the CERN p p colider, using a telescope of scintillation counters to detect particles with anomalously low ionization. Since no event survives the selection criteria, upper limits on quark production are deduced from this experiment. At 90% confidence level and in the limit of very light quarks with charge ± 1 2 and ± 2 3 they are 2.8×10 −6 and 5.6×10 −5 , respectively, per single charged particle. These limits increase rapidly with increasing quark mass and are nearly two and one order of magnitude better than previously measured by UA2.

Published
1985
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4. Measurement of W and Z Production Properties at the CERN anti-p p Collider

Author

R. Ansari, P. Bagnaia, M. Banner, R. Battiston, K. Bernlöhr, C. Booth, K. Borer, M. Borghini, G. Carboni, V. Cavasinni, P. Cenci, J.-C. Chollet, A.G. Clark, C. Conta, F. Costantini, P. Darriulat, B. de Lotto, T. del Prete, L. Dilella, J. Dines-Hansen, K. Einsweiler, L. Fayard, R. Ferrari, M. Fraternali, D. Froidevaux, J.-M. Gaillard, O. Gildemeister, V.G. Goggi, C. Gössling, B. Hahn, H. Hänni, J.R. Hansen, P. Hansen, K. Hara, N. Harnew, E. Hugentobler, E. Iacopini, L. Iconomidou-Fayard, K. Jakobs, P. Jenni, E.E. Kluge, O. Kofoed-Hansen, E. Lançon, P. Lariccia, M. Livan, S. Loucatos, B. Madsen, B. Mansoulié, G.C. Mantovani, L. Mapelli, K. Meier, B. Merkel, R. Möllerud, M. Moniez, R. Moning, M. Morganti, C. Onions, T. Pal, M.A. Parker, G. Parrour, F. Pastore, M. Pepe, Ch. Petridou, H. Plothow-Besch, M. Polverel, L. Rasmussen, J.-P. Repellin, A. Roussarie, V. Ruhlmann, G. Sauvage, J. Schacher, F. Stocker, M. Swartz, J. Teiger, K. Tittel, S.N. Tovey, W.Y. Tsang, M. Valdata-Nappi, V. Vercesi, A.R. Weidberg, M. Wunsch, and H. Zaccone

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Luminosity (scattering theory), Parton, Jet (particle physics), law.invention, Momentum, Nuclear physics, law, W and Z bosons, High Energy Physics::Experiment, Collider
Abstract

A study has been made of the production characteristics of W and Z bosons produced at the CERN p p Collider. The event sample consists of 251 W→ev decays, and 39 Z→e + e − decays, identified by the UA2 detector, and corresponds to an integrated luminosity of 142 nb −1 at √ s = 546 GeV, and 768 nb −1 at √ s = 630 GeV. Measurements of W and Z production cross sections, of longitudinal and transverse momentum distributions, and of associated jet production, are presented. These measurements are compared with theoretical expectations, which include higher order QCD effects.

Published
1987

5. The system of forward-backward drift chambers in the UA2 detector

Author

B. Madsen, O. Kofoed-Hansen, F. Pastore, Michele Livan, Peter Hansen, B. Rossini, A. Vicini, Adele Rimoldi, G.C. Mantovani, V.G. Goggi, J.D. Hansen, F. Impellizzeri, Marco Fraternali, G. Iuvino, R. Möllerud, G. Fumagalli, O. Gildemeister, L. Mapelli, and C. Conta

Subjects
Physics, Wire chamber, Toroid, Spectrometer, Physics::Instrumentation and Detectors, Detector, General Engineering, Particle detector, law.invention, Nuclear physics, law, Measuring instrument, Electronics, Detectors and Experimental Techniques, Nuclear Experiment, Collider
Abstract

The system of multiplane drift chambers for the forward-backward toroidal spectrometers of the UA2 experiment at the SPS pp collider is described. Details about mechanical design and construction techniques are given. Results on the performance of the chambers are reported.

Published
1983

6. Electron-pion discrimination with a scintillating fiber calorimeter

Author

Richard Wigmans, P. Sonderegger, Z.D. Thome, A. Simon, Livio Mapelli, A. Henriques, M. Sivertz, L. Linssen, R. DeSalvo, C.V. Scheel, M. Caria, B. Ong, Yaping Wang, R.M. Mondardini, Luiz Caloba, Chong-Yu Xu, Michele Livan, F.G. Hartjes, F. Pastore, Antonio Ereditato, Roberto Ferrari, Luc Poggioli, M.N. Souza, Salvatore Buontempo, K.H. Meier, Th.H. Henkes, A. Maio, H. P. Paar, M. Fraternali, V.G. Goggi, D. Acosta, G. Polesello, W. Hao, G. Fumagalli, Joao Seixas, M. Pereira, and Valerio Vercesi

Subjects
Physics, Nuclear and High Energy Physics, integumentary system, Calorimeter (particle physics), Backscatter, Scintillating fiber, Physics::Instrumentation and Detectors, business.industry, Detector, Electron, Nuclear physics, Optics, Pion, High Energy Physics::Experiment, Time structure, Detectors and Experimental Techniques, business, human activities, Instrumentation
Abstract

We report on an experimental study of a variety of techniques for discriminating between (isolated) electrons and pions in a lead and scintillating fiber calorimeter without longitudinal segmentation. Using information from the lateral shower development, from a pre-shower detector, from the time structure of the signals, or from a combination of these we measure pion rejection factors of up to several thousand while maintaining electron efficiencies of 95% or higher.

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