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51. Experimental study of the emergence of two-jet dominance in p collisions at √s = 630 GeV

Author

Eric Lancon, R. Mollerud, T. Himel, Louis Fayard, E. E. Kluge, C. Onions, R. Engelmann, B. Hahn, D. Froidevaux, S. Loucatos, B. De Lotto, J. Schacher, M. Morganti, M. Borghini, H. Zaccone, H. Hänni, P. Cenci, Giancarlo Mantovani, K. Bernlöhr, Bruno Mansoulie, J. Dines-Hansen, K. Borer, O. Kofoed-Hansen, J.-C. Chollet, V. Ruhlmann, M. A. Parker, B. Madsen, M. Banner, Adele Rimoldi, L. Di Lella, M. Valdata-Nappi, F. Stocker, John H. L. Hansen, J.P. Repellin, Melody A. Swartz, P. Darriulat, A. R. Weidberg, Marco Fraternali, O. Gildemeister, Michele Livan, G. Carboni, A. F. Rothenberg, Peter Hansen, Lydia Iconomidou-Fayard, C. Conta, S.N. Tovey, J.-M. Gaillard, V. Cavasinni, A. Roussarie, B. Merkel, Kevin Einsweiler, R. Battiston, G. Parrour, Allan G Clark, T. del Prete, P. Mani, M. Pepe, V. G. Goggi, H. Plothow-Besch, M. Moniez, W.Y. Tsang, F. Pastore, M. Wunsch, Paolo Bagnaia, G. Sauvage, Valerio Vercesi, J. A. Appel, M. Polverel, K. Meier, N. Harnew, R. Moning, Peter Jenni, Claus Gössling, M. Schlötelburg, J. Teiger, and Livio Mapelli

Subjects
Physics, Rest (physics), Nuclear and High Energy Physics, SIMPLE (dark matter experiment), Particle physics, Jet (particle physics), law.invention, Nuclear physics, Transverse plane, Dominance (ethology), law, Collider, Event (particle physics), Energy (signal processing)
Abstract

A heuristic model is used to describe data collected by the UA2 experiment at √ s = 630 GeV . Distributions of the energy sharing between the leading clusters and the rest of the event are examined. The main features of these distributions can be described by a two-component model with soft, collective interactions dominating at low transverse energy and hard, constituent interactions dominating at high transverse energy. This model provides a simple picture of the emergence of two-jet dominance at SPS p p Collider energies.

Published
1985

52. 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

53. A study of high transverse momentum electrons produced in $$\bar pp$$ collisions at 540 GeV

Author

G. Stimpfl, Allan G Clark, P. Mani, M. Borghini, Roberto Battiston, R. Engelmann, Melody A. Swartz, F. Bonaudi, B. Merkel, Michele Livan, Marco Fraternali, J. Schacher, T. Himel, M. Polverel, H. Plothow-Besch, V. G. Goggi, J. A. Zakrzewski, P. A. Dorsaz, C. Onions, D. Froidevaux, W. Zeller, Peter Hansen, Valerio Vercesi, J. Dines-Hansch, Paolo Bagnaia, V. Hungerbühler, B. Madsen, J. P. Repellin, F. Stocker, Eric Lancon, A. F. Rothenberg, John H. L. Hansen, A. Roussarie, C. Conta, W. R. Weidberg, K. Borer, J. M. Gaillard, Peter Jenni, L. Di Lella, P. Darriulat, O. Kofoed-Hansen, F. Pastore, G. Fumagalli, B. Hahn, S. Loucatos, Ph. Bloch, Giancarlo Mantovani, O. Gildemeister, G. Sauvage, H. Hänni, Bruno Mansoulie, S.N. Tovey, H. Zaccone, Adele Rimoldi, B.S. Nilsson, G. Parrour, N. Harnew, J. L. Siegrist, Livio Mapelli, M. Banner, J. Bürger, J. C. Chollet, P. Cenci, J. Teiger, Claus Gössling, R. Mollerud, and Louis Fayard

Subjects
Physics, Particle physics, Large Hadron Collider, Physics and Astronomy (miscellaneous), Weinberg angle, Elementary particle, Electron, law.invention, Standard Model, Particle acceleration, Nuclear physics, law, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Collider, Engineering (miscellaneous), Particle Physics - Experiment
Abstract

The production of electrons with very high transverse momentum has been studied in the UA2 experiment at the CERN {Mathematical expression} collider ( {Mathematical expression}=540 GeV). From a sample of events containing an electron candidate with pT>15 GeV/c, we extract a clear signal resulting from the production of the charged intermediate vector boson W±, which subsequently decays into an electron and a neutrino. We study the W production and decay properties. Further-more, we refine our results on the production and decay of the neutral vector boson Z0. Finally, we compare the experimental results to the predictions of the standard model of the unified electro-weak theory. © 1984 Springer-Verlag.

Published
1984

54. 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

55. Measurement of the dependence of jet production at the CERN p collider

Author

Claus Gössling, M. Borghini, M. Morganti, Eric Lancon, H. Hänni, M. Wunsch, M. Polverel, N. Harnew, Livio Mapelli, A. Putzer, F. Stocker, P. Darriulat, Allan G Clark, P. Mani, R. Moning, A. F. Rothenberg, A. Roussarie, B. De Lotto, K. Borer, V. Ruhlmann, Roberto Battiston, Vincenzo Cavasinni, H. Zaccone, Michele Livan, Paolo Bagnaia, E. E. Kluge, J. Dines-Hansen, Melody A. Swartz, M. Schlötelburg, V. G. Goggi, Peter Jenni, J. Teiger, G. Sauvage, J.-M. Gaillard, B. Hahn, D. Froidevaux, Bruno Mansoulie, O. Kofoed-Hansen, J. A. Appel, W.Y. Tsang, C. Onions, H. Plothow-Besch, B. Merkel, K. Meier, Lydia Iconomidou-Fayard, L. Di Lella, G. Parrour, K. Tittel, A. Codino, John H. L. Hansen, P. Cenci, M. Valdata-Nappi, M. Moniez, C. Conta, Giovanni Carboni, S. Loucatos, J.P. Repellin, F. Pastore, J.-C. Chollet, L. Rasmussen, Marco Fraternali, Giancarlo Mantovani, Peter Hansen, Adele Rimoldi, R. Engelmann, J. Schacher, K. Bernlöhr, Valerio Vercesi, M. Banner, T. Himel, T. Del Prete, O. Gildemeister, M. Pepe, R. Mollerud, A. R. Weidberg, Louis Fayard, S.N. Tovey, Kevin Einsweiler, and B. Madsen

Subjects
Quark, Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Hadron, Jet (particle physics), law.invention, Nuclear physics, law, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, Collider, Scaling
Abstract

The production of very large transverse momentum ( p T ) hadron jets has been measured in the UA2 experiment at the CERN p p Collider for s =630 GeV . The inclusive jet production cross sections exhibit a p T -dependent increase with respect to the s =546 GeV data from previous Collider runs. This increase can be described both by QCD calculations and by approximate x T =2 p T /√ s scaling. No significant deviation of the data from QCD predictions is observed at very large p T , placing a lower limit on the characteristic scale Λ c of a hypothetical superstrong contact interaction responsible for the binding of preons in the quark ( Λ c >370 GeV at 95% CL).

Published
1985

56. Direct photon production at the CERN p̄p collider

Author

P. Cenci, Eric Lancon, Marco Fraternali, Peter Hansen, G. Sauvage, A. R. Weidberg, M. Banner, H. Zaccone, C. Onions, S.N. Tovey, J. A. Appel, N. Harnew, Livio Mapelli, R. Mollerud, K. Meier, Kevin Einsweiler, M. Borghini, E. E. Kluge, Louis Fayard, J. C. Chollet, John H. L. Hansen, C. Conta, T. Himel, B. Hahn, M. Morganti, Allan G Clark, P. Mani, G. Parrour, Claus Gössling, B. Merkel, Roberto Battiston, M. Pepe, M. Schlötelburg, J. Teiger, M. Wunsch, Lydia Iconomidou-Fayard, V. G. Goggi, Melody A. Swartz, S. Loucatos, Giovanni Carboni, M. Valdata-Nappi, W.Y. Tsang, B. De Lotto, M. Polverel, Giancarlo Mantovani, T. Del Prete, R. Moning, M. A. Parker, M. Moniez, L. DiLella, Vincenzo Cavasinni, Bruno Mansoulie, Paolo Bagnaia, P. Darriulat, O. Kofoedo. Kofoed-Hansen, F. Pastore, Michele Livan, H. Hänni, Valerio Vercesi, K. Jacobs, R. Engelmann, Peter Jenni, J. Schacher, F. Stocker, D. Froidevaux, K. Borer, V. Ruhlmann, A. F. Rothenberg, A. Roussarie, K. Bernlöhr, J. P. Repellin, B. Madsen, O. Gildemeister, J. M. Gaillard, H. Plothow-Besch, and J. Dines-Hansen

Subjects
Nuclear physics, Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Cross section (physics), Particle physics, Photon, Large Hadron Collider, law, High Energy Physics::Experiment, Nuclear Experiment, Collider, law.invention
Abstract

Using the UA2 apparatus, the inclusive cross section has been measured for production of high- p T direct photons in pp collisions at s =546 GeV and s =630 GeV . The results are in good agreement with QCD predictions.

Published
1986

57. Measurements of hyperon semileptonic decays at the CERN Super Proton Synchrotron

Author

R. Strub, M. Bourquin, P. Igo-Kemenes, G. Sauvage, Vincent J Smith, B. Merkel, B. J. Saunders, H. Plothow, R. Morand, J. C. Chollet, J. J. Thresher, J. P. Repellin, C. N. P. Gee, P. W. Jeffreys, R.J. Ott, B. Schiby, Daniel Froidevaux, A. R. Fyfe, J. M. Gaillard, H. W. Siebert, W. M. Gibson, R.J. Gray, Y. Chatelus, R. M. Brown, K. P. Streit, and A. Degré

Subjects
Physics, Particle physics, Large Hadron Collider, Physics and Astronomy (miscellaneous), Proton, Physics::Instrumentation and Detectors, Nuclear Theory, Hyperon, Scintillator, Super Proton Synchrotron, Charged particle, Transition radiation, Physics::Accelerator Physics, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Engineering (miscellaneous)
Abstract

The charged hyperon beam at the CERN Super Proton Synchrotron (SPS) has been used to collect data on semileptonic decays of Σ−, Ξ−, andΛ. A magnetic channel selected 100 GeV/c negatively charged particles produced in the forward direction by interaction of a 210 GeV/c proton beam on a BeO target. The Σ− and Ξ− hyperons were concurrently identified in a DISC Cerenkov counter, and their decay products were analysed by a magnetic spectrometer. Electron-hadron discrimination was achieved by the combined use of lead glass and lead/scintillator counters, transition radiation detectors, and a Cerenkov counter.

Published
1983

58. Measurements of hyperon semileptonic decays at the CERN Super Proton Synchrotron

Author

M. Bourquin, R. M. Brown, Y. Chatelus, J. C. Chollet, A. Degré, D. Froidevaux, A. R. Fyfe, J. -M. Gaillard, C. N. P. Gee, W. M. Gibson, R. J. Gray, P. Igo-Kemenes, P. W. Jeffreys, B. Merkel, R. Morand, R. J. Ott, H. Plothow, J. -P. Repellin, B. J. Saunders, G. Sauvage, B. Schiby, H. W. Siebert, V. J. Smith, K. -P. Streit, R. Strub, and J. J. Thresher

Subjects
Physics and Astronomy (miscellaneous), Engineering (miscellaneous)
Published
1983

59. Measurement ofW ± andZ 0 properties at the CERN $$\bar pp$$ p collider

Author

M. Wunsch, John H. L. Hansen, P. Darriulat, M. Polverel, C. Conta, O. Gildemeister, G. Sauvage, Lydia Iconomidou-Fayard, R. Moning, M. Moniez, Roberto Battiston, P. Cenci, G. Parrour, M. Borghini, Claus Gössling, H. Hänni, H. Plothow-Besch, Melody A. Swartz, O. Kofoed-Hansen, K. Borer, M. Pepe, T. Himel, J. C. Chollet, R. Engelmann, J. Schacher, F. Stocker, K. Tittel, L. Di Lella, S. Loucatos, B. De Lotto, A. Roussarie, A. F. Rothenberg, K. Bernlöhr, A. Codino, Michele Livan, J. Dines-Hansen, R. Mollerud, Vincenzo Cavasinni, M. Valdata-Nappi, W. Y. Tsang, Paolo Bagnaia, Giancarlo Mantovani, Louis Fayard, V. G. Goggi, Giovanni Carboni, E. E. Kluge, Allan G Clark, M. Schlötelburg, P. Mani, J. Teiger, M. A. Parker, V. Ruhlmann, J. A. Appel, Peter Jenni, A. R. Weidberg, K. Meier, N. Harnew, Livio Mapelli, J. P. Repellin, F. Pastore, Valerio Vercesi, C. Onions, D. Froidevaux, Bruno Mansoulie, M. Banner, S.N. Tovey, H. Zaccone, Kevin Einsweiler, T. Del Prete, B. Hahn, B. Merkel, B. Madsen, J. M. Gaillard, M. Morganti, A. Putzer, Marco Fraternali, Peter Hansen, B.S. Nilsson, Eric Lancon, and K. Jakobs

Subjects
Physics, Quantum chromodynamics, Particle physics, Luminosity (scattering theory), Large Hadron Collider, Physics and Astronomy (miscellaneous), Electroweak interaction, Weinberg angle, Elementary particle, law.invention, Standard Model, Nuclear physics, law, High Energy Physics::Experiment, Nuclear Experiment, Collider, Engineering (miscellaneous)
Abstract

A study ofW± andZ0 properties has been performed using the UA2 detector at the\(\bar pp\) collider. The data correspond to a total integrated luminosity of 142 nb−1 at\(\sqrt s \)=546 GeV, and of 310 nb−1 at\(\sqrt s \)=630 GeV. The experimental results are compared with the predictions of the Standard Model of the unified electroweak theory.

Published
1986

60. Inclusive π0 production at the CERN p-p̄ collider

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Muon, Meson, Hadron, Elementary particle, Nuclear physics, Pion, High Energy Physics::Experiment, Nuclear Experiment, Lepton, Boson
Abstract

Inclusive π 0 production has been measured at the CERN pp collider, s =540 GeV , for 90° production angle and in a range of transverse momenta between 1.5 and 4.5 GeV/ c . The invariant production cross section is larger than that measured at s = 53 GeV for p-p collisions. The production of μ mesons aand of direct photons is also investigated.

Published
1982

61. Particle and antiparticle production by 200 GeV/c protons in the charged hyperon beam at the CERN SPS

Author

M. Croissiaux, R. M. Brown, R. Morand, M. Ferro-Luzzi, K. P. Streit, J. J. Thresher, M. Bourquin, P. Igo-Kemens, B.J. Saunders, A. Degré, P. W. Jeffreys, J. P. Repellin, B. Schiby, Vincent J Smith, W. M. Gibson, R. Strub, J.-M. Gaillard, R.J. Gray, Y. Chatelus, R.J. Ott, Daniel Froidevaux, C. N. P. Gee, H. W. Siebert, G. Sauvage, J. Trischuk, A. R. Fyfe, B. Merkel, J. C. Chollet, and H. Plothow

Subjects
Nuclear physics, Physics, Momentum, Nuclear and High Energy Physics, Antiparticle, Range (particle radiation), Large Hadron Collider, Proton, Hyperon, Particle, High Energy Physics::Experiment, Nuclear Experiment, Beam (structure)
Abstract

A charge hyperon beam has been brought into operation at the CERN SPS. Particles are identified by a DISC Cerenkov counter, and decay products are analysed by a magnetic spectrometer. Cross sections for the inclusive production of π + , K + , p , Σ + , Σ − , ζ − , d, and π − , K − , p , Σ + , Σ − , ζ − , ω − , d in the forward direction have been measured at laboratory momenta between 70 and 130 GeV/ c . This range of momenta corresponds to 0.35 ⩽ x ⩽ 0.66 for an incident proton momentum of 200 GeV/ c . Antihyperon ( Σ − , ζ − , Σ + ) and Σ + and ω − fluxes have been measured for the first time in a hyperon beam. Scaling behaviour is observed when the data are compared with the results from other experiments. The inclusive particle production cross sections have a (1 − x ) n dependence, where n is characteristics of the particle. A search has been made for new particles in the mass range 2–10 GeV/ c 2 . No evidence is found for such particles.

Published
1979

62. A study of three-jet events at the CERN $$\bar pp$$ collider

Author

M. Borghini, V. Ruhlmann, M. Pepe, Roberto Battiston, V. G. Goggi, L. Di Lella, M. Valdata-Nappi, Melody A. Swartz, Lydia Iconomidou-Fayard, Peter Jenni, M. Wunsch, John H. L. Hansen, M. Banner, J. C. Chollet, R. Engelmann, J. Schacher, Valerio Vercesi, H. Plothow-Besch, C. Conta, M. Polverel, R. Mollerud, K. Borer, B. De Lotto, W. Y. Tsang, K. Bernlöhr, Louis Fayard, J. Bürger, T. Himel, O. Gildemeister, R. Moning, P. Cenci, P. Darriulat, B. Merkel, F. Stocker, A. Codino, J. Dines-Hansen, A. F. Rothenberg, G. Sauvage, J. A. Appel, K. Jakobs, Eric Lancon, J. P. Repellin, O. Kofoed-Hansen, K. Meier, Giovanni Carboni, Marco Fraternali, Michele Livan, H. Zaccone, B. Hahn, C. Onions, D. Froidevaux, S. Loucatos, H. Hänni, G. Parrour, Peter Hansen, Claus Gössling, F. Pastore, Giancarlo Mantovani, M. A. Parker, Adele Rimoldi, B. Madsen, T. Del Prete, Vincenzo Cavasinni, M. Moniez, Paolo Bagnaia, Allan G Clark, A. R. Weidberg, P. Mani, S.N. Tovey, Kevin Einsweiler, A. Roussarie, N. Harnew, Livio Mapelli, E. E. Kluge, J. M. Gaillard, M. Morganti, Bruno Mansoulie, M. Schlötelburg, and J. Teiger

Subjects
Quantum chromodynamics, Physics, Particle physics, Large Hadron Collider, Physics and Astronomy (miscellaneous), Bar (music), Bremsstrahlung, Jet (particle physics), Measure (mathematics), law.invention, Gluon, Nuclear physics, law, High Energy Physics::Experiment, Collider, Engineering (miscellaneous)
Abstract

The UA2 experiment, running at the CERN SPS\(\bar pp\) Collider, has performed a study of events containing three hard jets in the final state. The angular distributions of the three jets show evidence for gluon bremsstrahlung, in good agreement with a QCD model to leading order in the strong coupling constant αs. The yield of three-jet events relative to that of two-jet events provides a measure of the strong coupling constant: ;3K3/K2=0.23±0.01±0.04, whereK2 andK3 represent the contributions arising from higher order corrections in α3 to the two- and three-jet exclusive cross-sections. A detailed discussion of the systematic and theoretical uncertainties is given.

Published
1986

63. Inclusive particle production in the transverse momentum range between 0.25 and 40 GeV/c at the CERN Sp$\overline{p}$S collider

Author

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

Subjects
Physics, Particle physics, Large Hadron Collider, Physics and Astronomy (miscellaneous), Meson, Branching fraction, Hadron, Elementary particle, Charged particle, law.invention, Nuclear physics, Pion, law, High Energy Physics::Experiment, Nuclear Experiment, Collider, Engineering (miscellaneous), Particle Physics - Experiment
Abstract

Inclusive particle production cross-sections have been measured at the $$Sp\bar pS$$ collider using the UA2 detector in various ranges of transverse momentum (P T ) and pseudo-rapidity (η). Cross-section measurements are presented forπ 0 production (P T ≦15 GeV/c, |η|≦0.85 andP T ≦40 GeV/c, 1.0≦|η|≦1.8), for η meson production (3≦P T ≦6 GeV/c, |η|≦0.85) and for charged particle production (P T ≦10 GeV/c, 1.0≦|η|≦1.8). Results are compared with the predictions of QCD calculations.

Published
1985

64. SEARCH FOR DECAYS OF THE W+/-BOSONS AND Z-BOSONS INTO QUARK ANTIQUARK PAIRS

Author

Marco Fraternali, M. Moniez, Roberto Battiston, M. Morganti, H. Hänni, Eric Lancon, K. Borer, J. Dines-Hansen, V. Ruhlmann, Christophe Corona, Melody A. Swartz, Claus Gössling, N. Harnew, Livio Mapelli, R. Mollerud, P. Lariccia, C. N. Booth, D. Froidevaux, Louis Fayard, L. DiLella, J. Teiger, C. Onions, Peter Jenni, E. E. Kluge, E. Iacopini, B. Merkel, K. Jakobs, R. Moning, B. Hahn, Chariclia Petridou, E. Hugentobler, V. G. Goggi, H. Zaccone, Steinar Stapnes, M. Valdata-Nappi, P. Cenci, Allan G Clark, Vincenzo Cavasinni, J. P. Repellin, G. Sauvage, Paolo Bagnaia, J. M. Gaillard, Bruno Mansoulie, H. Plothow-Besch, P. H. Hansen, M. Wunsch, F. Costantini, M. Banner, W.Y. Tsang, G. Parrour, K. Hara, Giovanni Carboni, John H. L. Hansen, Lydia Iconomidou-Fayard, M. Polverel, C. Conta, M. Pepe, J. Schacher, K. Bernlöhr, S. Lami, Roberto Ferrari, O. Kofoed-Hansen, B. Madsen, F. Pastore, M. Borghini, S. Loucatos, O. Gildemeister, R. Ansari, J. C. Chollet, Giancarlo Mantovani, Michele Livan, B. De Lotto, M. A. Parker, Adele Rimoldi, F. Stocker, P. Darriulat, A. Roussarie, Valerio Vercesi, L. Rasmussen, T. Del Prete, A. R. Weidberg, Kevin Einsweiler, and K. Meier

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Hadron, Elementary particle, Nuclear physics, Particle decay, W and Z bosons, Mass spectrum, High Energy Physics::Experiment, Invariant mass, Particle Physics - Experiment, Boson
Abstract

The invariant mass distribution of jet pairs observed in the UA2 central calorimeter is examined in the search for an excess of events in the region of the W ± and Z bosons, which would reveal their decays into quark-antiquark pairs. We give a detailed account of the methods of analysis used to optimize the mass resolution achieving ≅±10%. A structure is observed at the level of ≅ 3 standard deviations in the mass region of W ± and Z with shape and position consistent with expectation from their qqdecays. It contains 632 ± 190 events, 1.4 standard deviations above the standard model prediction of 340 ± 80 events.

Published
1987

65. Charged baryon and antibaryon production in the fragmentation region by 240 GeV protons

Author

P. W. Jeffreys, B. J. Saunders, J. P. Repellin, Vincent J Smith, Daniel Froidevaux, P. Igo-Kemenes, R. Strub, K. P. Streit, M. Bourquin, W. M. Gibson, J. J. Thresher, R. M. Brown, Y. Chatelus, J. M. Gaillard, R. Morand, H. W. Siebert, H. Plothow, J. C. Chollet, B. Merkel, A. R. Fyfe, A. Degré, S. N. Tovey, G. Sauvage, C. N. P. Gee, B. Schiby, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Heyd, Yvette

Subjects
Physics, Baryon, Nuclear physics, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Particle physics, Physics and Astronomy (miscellaneous), Proton, Fragmentation (mass spectrometry), [PHYS.ASTR.CO] Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Yield ratio, Strangeness, Engineering (miscellaneous), Particle Physics - Experiment
Abstract

Measurements of the production inp-BeO collisions of charged baryons and antibaryons with strangeness between −3 and +3 at $$\sqrt s = 21.2GeV$$ x=0.48, andp T =600MeV/c are reported. The experimental results can be interpreted within the framework of a simple proton fragmentation-recombination model.

Published
1980

66. Measurement of the standard model parameters from a study of W and Z bosons

Author

Giovanni Carboni, P. Lariccia, B. Lisowski, John H. L. Hansen, Lydia Iconomidou-Fayard, C. Conta, F. Pastore, J. M. Gaillard, H. Plothow-Besch, Allan G Clark, A. Roussarie, V. G. Goggi, Valerio Vercesi, K. Borer, P. H. Hansen, W.Y. Tsang, V. Ruhlmann, M. Moniez, K. Hara, Marco Fraternali, C. Onions, F. Stocker, M. Morganti, P. Darriulat, J. Dines-Hansen, G. Sauvage, T. Del Prete, Roberto Battiston, H. Zaccone, E. Iacopini, B. Hahn, J. Teiger, Chariclia Petridou, B. Madsen, G. Parrour, T. Pal, Vincenzo Cavasinni, Paolo Bagnaia, Melody A. Swartz, N. Harnew, Livio Mapelli, D. Froidevaux, B. De Lotto, L. Rasmussen, Claus Gössling, F. Costantini, E. E. Kluge, L. Di Lella, Michele Livan, O. Gildemeister, R. Moning, H. Hänni, Bruno Mansoulie, B. Merkel, M. Banner, P. Cenci, O. Kofoed-Hansen, A. R. Weidberg, S. Loucatos, R. Mollerud, S.N. Tovey, Louis Fayard, Kevin Einsweiler, Peter Jenni, Giancarlo Mantovani, M. A. Parker, M. Pepe, Roberto Ferrari, J. C. Chollet, Eric Lancon, M. Wunsch, K. Jakobs, M. Polverel, J. A. Zakrzewski, C. N. Booth, J. P. Repellin, M. Borghini, R. Ansari, J. Schacher, K. Bernlöhr, E. Hugentobler, M. Valdata-Nappi, K. Meier, Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and UA2

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Luminosity (scattering theory), 010308 nuclear & particles physics, Electroweak interaction, Weinberg angle, 7. Clean energy, 01 natural sciences, law.invention, Standard Model, Nuclear physics, law, 0103 physical sciences, W′ and Z′ bosons, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Neutrino, Nuclear Experiment, 010306 general physics, Collider, Particle Physics - Experiment
Abstract

A study has been made of the decays W → ev and Z → e + e − , using the UA2 detector at the CERN pp Collider. The data correspond to an integrated luminosity of 142 nb −1 at a centre-of-mass collision energy √ s =546 GeV, and 768 nb −1 at √ s =630 GeV. Measurements of the standard model parameters from samples of 251 W decay and 39 Z decay candidates are compared with expectations of the standard electroweak model.

Published
1987

67. EVIDENCE FOR Z0-]E+E- AT THE CERN P-P COLLIDER

Author

H. Zaccone, F. Bonaudi, B.S. Nilsson, G. Sauvage, O. Kofoed-Hansen, B. Merkel, F. Stocker, A. F. Rothenberg, J. C. Chollet, B. Madsen, J. Dines-Hansen, A. R. Weidberg, G. Stimpfl, P. A. Dorsaz, J. M. Gaillard, H. Plothow-Besch, Valerio Vercesi, V. Hungerbühler, Michele Livan, Marco Fraternali, W. Zeller, T. Himel, G. Fumagalli, J. Schacher, B. Hahn, Allan G Clark, P. Mani, Livio Mapelli, S. Loucatos, H.M. Steiner, Ph. Bloch, Giancarlo Mantovani, Adele Rimoldi, O. Gildemeister, Peter Jenni, Eric Lancon, L. Di Lella, K. Borer, J. Teiger, P. Darriulat, G. Parrour, H. Hänni, Paolo Bagnaia, C. Onions, Bruno Mansoulie, M. Borghini, J. L. Siegrist, A. Roussarie, Roberto Battiston, H. Grote, M. Mermikides, M. Banner, M. Polverel, J. A. Zakrzewski, J. P. Repellin, R. Mollerud, Louis Fayard, Daniel Froidevaux, V. G. Goggi, John H. L. Hansen, C. Conta, P. H. Hansen, and F. Pastore

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Electron pair, Large Hadron Collider, Electroweak interaction, Weinberg angle, Electron, law.invention, Vector boson, Nuclear physics, law, High Energy Physics::Experiment, Collider, Boson
Abstract

From a search for electron pairs produced in p p collisions at s = 550 GeV we report the observation of eight events which we interpret as resulting from the process p +p→Z 0 + anything, followed by the decay Z0→e++e− or Z0→e++e−+γ, where Z0 is the neutral Intermediate Vector Boson postulated by the unified electroweak theory. We use four of these events to measure the Z0 mass M Z = 91.9 ± 1.3 ± 1.4 (systematic) GeV /c 2 .

Published
1983

68. MEASUREMENT OF VERY LARGE TRANSVERSE-MOMENTUM JET PRODUCTION AT THE CERN P-BAR-P COLLIDER

Author

F. Stocker, L. Di Lella, A. Roussarie, A. F. Rothenberg, O. Kofoed-Hansen, G. Stimpfl, Claus Gössling, Eric Lancon, M. Borghini, Livio Mapelli, S. Loucatos, Michele Livan, H. Plothow-Besch, Marco Fraternali, C. Onions, D. Froidevaux, G. Sauvage, B. Hahn, W. Zeller, Peter Hansen, R. Engelmann, Ph. Bloch, A. R. Weidberg, Giancarlo Mantovani, J. A. Zakrzewski, Bruno Mansoulie, B. Madsen, J. Teiger, H. Zaccone, J. C. Chollet, J. Dines-Hansen, Allan G Clark, P. Mani, O. Gildemeister, M. J. Shochet, Adele Rimoldi, M. Banner, John H. L. Hansen, G. Parrour, J. L. Siegrist, J. Schcher, Roberto Battiston, J. P. Repellin, C. Conta, H. Hänni, Melody A. Swartz, M. Polverel, R. Mollerud, K. Borer, B. Merkel, F. Pastore, P. Darriulat, Louis Fayard, Valerio Vercesi, V. G. Goggi, J. Bürger, J. M. Gaillard, Peter Jenni, Paolo Bagnaia, and T. Himel

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Large Hadron Collider, Calorimeter (particle physics), Astrophysics::High Energy Astrophysical Phenomena, Hadron, Jet (particle physics), law.invention, Nuclear physics, law, High Energy Physics::Experiment, Invariant mass, Nuclear Experiment, Collider
Abstract

The production of very large transverse momentum hadron jets has been measured in the UA2 experiment at the CERN p p Collider for s = 540 GeV using a highly segmented calorimeter. The range of previously available cross sections for inclusive jet production is extended to pT = 150 GeV and the two-jet invariant mass distribution to mjj = 280 GeV with the largely increased data sample collected during the 1983 running period. The results are compared with the predictions of QCD models.

Published
1984

69. SEARCH FOR EXOTIC PROCESSES AT THE CERN PPBAR COLLIDER

Author

G. Sauvage, Roberto Ferrari, Marco Fraternali, J. C. Chollet, B. Hahn, Chariclia Petridou, M. Morganti, G. Parrour, P. Lariccia, Allan G Clark, Steinar Stapnes, B. De Lotto, B. Madsen, Peter Jenni, P. Bagnala, J. M. Gaillard, H. Plothow-Besch, B. Merkel, O. Gildemeister, V. G. Goggi, R. Moning, M. Wunsch, E. Iacopini, Bruno Mansoulie, M. Banner, M. Moniez, P. Darriulat, E. Hugentobler, Vincenzo Cavasinni, P. Cenci, O. Kofoed-Hansen, W.Y. Tsang, Roberto Battiston, Michele Livan, M. Valdata-Nappi, K. Hara, S. Loucatos, H. Hänni, M. Polverel, Melody A. Swartz, F. Stocker, John H. L. Hansen, N. Harnew, C. Conta, Livio Mapelli, Lydia Iconomidou-Fayard, Giancarlo Mantovani, J. Schacher, H. Zaccone, J. Dines-Hansen, K. Borer, V. Ruhlmann, D. Froidevaux, Valerio Vercesi, M. A. Parker, A. Roussarie, Eric Lancon, M. Borghini, E. E. Kluge, K. Bernlöhr, F. Costantini, M. Pepe, L. Di Lella, R. Ansari, R. Mollerud, K. Jacobs, C. N. Booth, Claus Gössling, J. P. Repellin, J. Teiger, K. Meier, T. Pal, Giovanni Carboni, Louis Fayard, T. Del Prete, F. Pastore, P. H. Hansen, C. Onions, A. R. Weidberg, Kevin Einsweiler, and L. Rasmussen

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Luminosity (scattering theory), law, Excited state, High Energy Physics::Experiment, Neutral vector, Collider, law.invention, Boson
Abstract

The total UA2 data sample at the CERN pp Collider corresponds to an integrated luminosity of 910 nb −1 . Limits on various hypothetical processes, such as production of excited electrons, additional charged or neutral vector bosons, or supersymmetric particles, are presented from the analysis of this sample.

Published
1987

70. Design and rejection studies for a cylindrical transition radiation detector for the UA2 upgrade

Author

B. Merkel, G. Parrour, M. Moniez, B. De Lotto, Lydia Iconomidou-Fayard, J. P. Repellin, Louis Fayard, Daniel Froidevaux, J. C. Chollet, R. Ansari, Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Starita, Sabine

Subjects
Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, business.industry, Hadron, chemistry.chemical_element, Electron, 7. Clean energy, 01 natural sciences, Transition radiation detector, Optics, Upgrade, chemistry, [PHYS.PHYS.PHYS-INS-DET] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 0103 physical sciences, Cluster (physics), Lithium, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Detectors and Experimental Techniques, 010306 general physics, business, Instrumentation
Abstract

A study of a compact and cylindrical transition radiation detector is described. A prototype has been built and tested with 40 GeV electrons and hadrons. The measurement have been done using 100 MHz FADC. We have compared different radiators and chamber geometries using various algorithms. The cluster counting and the total integrated charge methods give comparable results. A comparison between radiators of lithium and polypropylene is made.

Published
1986

71. 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

72. JET MEASURES AND HADRONIC EVENT SHAPES AT THE CERN anti-p p COLLIDER

Author

Steinar Stapnes, V. G. Goggi, H. Plothow-Besch, V. Ruhlmann, G. Sauvage, M. Moniez, L. DiLella, A. Roussarie, R. Mollerud, K. Meier, Louis Fayard, H. Hänni, Peter Jenni, N. Harnew, Livio Mapelli, G. Parrour, O. Kofoed-Hansen, K. Borer, O. Gildemeister, P. H. Hansen, Lydia Iconomidou-Fayard, Roberto Ferrari, J. C. Chollet, Eric Lancon, S. Loucatos, T. Del Prete, J. Dines-Hansen, Giovanni Carboni, Allan G Clark, M. Pepe, P. Lariccia, E. E. Kluge, B. Madsen, Chariclia Petridou, Giancarlo Mantovani, F. Pastore, J. Schacher, R. Moning, F. Costantini, M. A. Parker, Bruno Mansoulie, F. Stocker, Michele Livan, Adele Rimoldi, M. Banner, K. Bernlöhr, C. Onions, D. Froidevaux, B. Hahn, E. Iacopini, K. Jakobs, Claus Gössling, Vincenzo Cavasinni, Paolo Bagnaia, M. Morganti, L. Rasmussen, B. De Lotto, P. Darriulat, H. Zaccone, J. Teiger, B. Merkel, P. Cenci, Valerio Vercesi, A. R. Weidberg, Kevin Einsweiler, C. N. Booth, J. P. Repellin, Marco Fraternali, M. Borghini, R. Ansari, M. Wunsch, M. Polverel, Roberto Battiston, Melody A. Swartz, J. M. Gaillard, E. Hugentobler, M. Valdata-Nappi, W.Y. Tsang, K. Hara, John H. L. Hansen, and C. Conta

Subjects
Physics, Range (particle radiation), Particle physics, Large Hadron Collider, Physics and Astronomy (miscellaneous), Calorimeter (particle physics), Hadron, Parton, law.invention, Nuclear physics, Transverse plane, law, Phase space, High Energy Physics::Experiment, Nuclear Experiment, Collider, Engineering (miscellaneous), Particle Physics - Experiment
Abstract

We analyze the energy density distribution in harronic final states as a function of their total transverse energy measured in the segmented central calorimeter of the UA2 detector. The energy dependence of collective shape variables is investigated. The data, collected at the CERN $$\bar p$$ p Collider at $$\sqrt s = 630$$ GeV, exhibit strong variations in all these variables over the transverse energy range between 15 and 210 GeV, corresponding to substantial modifications in the structure of multihadronic final states. The evolution of the energy density distribution and of the collective shape variables shows a clear transition between two extreme dynamical regimes, respectively dominated byp T -limited phase space and by collimated two-jet configurations. A study of the relative populations of two-and three-jet systems reveals two different sources of configurations having three distinct lobes in the pattern of the energy-flow. A first component, steeply falling with energy, receives substantial contributions from soft parton collisions at lower transverse energies. Above 60 GeV a new hard component emerges, characterized by an approximately constant rate with respect to the dominant two-jet structures.

Published
1987

73. Measurement of production and properties of jets at the CERN $\overline{p}$p collider

Author

O. Kofoed-Hansen, M. Borghini, J. Teiger, S. Loucatos, Eric Lancon, H.M. Steiner, G. Fumagalli, B. Hahn, Ph. Bloch, Giancarlo Mantovani, Bruno Mansoulie, F. Bonaudi, H. Hänni, K. Borer, Adele Rimoldi, Michele Livan, Marco Fraternali, J. L. Siegrist, M. Polverel, W. Zeller, Peter Hansen, G. Parrour, B. Madsen, Allan G Clark, P. Mani, O. Gildemeister, F. Stocker, Livio Mapelli, Daniel Froidevaux, A. F. Rothenberg, F. Psstore, M. Banner, G. Sauvage, J. P. Repellin, L. Di Lella, C. Onions, H. Zaccone, A. R. Weidberg, Peter Jenni, R. Mollerud, B. Merkel, G. Stimpfl, Louis Fayard, P. Darriulat, J. M. Gaillard, Paolo Bagnaia, J. Schacher, V. G. Goggi, V. Hungerbühler, John H. L. Hansen, C. Conta, J. C. Chollet, A. Roussarie, Roberto Battiston, T. Himel, P. A. Dorsaz, Valerio Vercesi, J. Dines-Hansen, and H. Plothow-Besch

Subjects
Physics, Particle physics, Large Hadron Collider, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Hadron, 01 natural sciences, 7. Clean energy, Nuclear physics, Angular distribution, 0103 physical sciences, Transverse momentum, High Energy Physics::Experiment, Invariant mass, Rapidity, Nuclear Experiment, 010306 general physics, Engineering (miscellaneous), Particle Physics - Experiment
Abstract

The production and properties of high transverse momentum hadron jets have been measured in the UA2 experiment at the CERN $$\bar pp$$ Collider $$(\sqrt s = 540 GEV)$$ using a highly segmented total absorption calorimeter. The characteristics of a sample of two-jet events with invariant mass up to 200 GeV/c2 are discussed, including measurements of their fragmentation properties, angular and rapidity distributions, and the properties of the additional energy clusters accompanying the two-jet system. Cross sections for inclusive jet production in the jet transverse momentum range between 30 and 100 GeV/c and for the two-jet invariant mass distribution in the mass range from 60–200 GeV/c2 are reported.

Published
1983

74. Electron/hadron discrimination in the hyperon semileptonic decay experiments performed at the CERN SPS

Author

J. J. Thresher, B. Merkel, G. Sauvage, H. Plothow, J. M. Gaillard, R. Morand, J. C. Chollet, P. Igo-Kemenes, H. W. Siebert, J. Trischuk, R. Strub, R.J. Gray, M. Bourquin, K. P. Streit, B. Schiby, B.J. Saunders, W.M. Gibson, A. R. Fyfe, Y. Chatelus, Robert M Brown, J. P. Repellin, P. W. Jeffreys, C.N.P. Gee, R.J. Ott, Daniel Froidevaux, A. Degré, Vincent J Smith, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Heyd, Yvette

Subjects
Semileptonic decay, Physics, Particle physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics::Instrumentation and Detectors, Hadron, General Engineering, Hyperon, Electron, Charged particle, Nuclear physics, Pion, Transition radiation, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Cherenkov radiation
Abstract

We describe an experimental arrangement which was used to discriminate between pions and electrons over the momentum range from 2 to 35 GeV/c in a series of semileptonic decay experiments performed in the CERN SPS charged hyperon beam. The set-up comprised two transition radiation detectors, a lead glass array, a threshold gas Cherenkov counter and a set of lead-scintillator shower counters. For the decays with one charged particle in the final state, the combined pion rejection provided by the transition radiation detectors and the lead glass array was 45000: 1 (Σ−→nπ−) with an electron efficiency of 76% ( Σ − → ne − υ ). In the decays producing three charged particles the rejection was 40000: 1 (σ−→Λπ−, Λ→pπ−) and the efficiency 70% (σ→Λ e − υ , Λ→ p π − and σ − →Λπ − , Λ→ pe − υ ) .

Published
1983

75. Observation of single isolated electrons of high transverse momentum in events with missing transverse energy at the CERN $\overline{p}$p collider

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Electroweak interaction, Electron, law.invention, Nuclear physics, Azimuth, Transverse plane, law, Transverse momentum, Nuclear Experiment, Collider, Energy (signal processing), Particle Physics - Experiment
Abstract

We report the results of a search for single isolated electrons of high transverse momentum at the CERN p p collider. Above 15 GeV/c, four events are found having large missing transverse energy along a direction opposite in azimuth to that of the high-pT electron. Both the configuration of the events and their number are consistent with the expectations from the process p + p → W ± + anything , with W→e+ν, where W± is the charged Intermediate Vector Boso postulated by the unified electroweak theory.

Published
1983

76. MEASUREMENT OF THE STRONG COUPLING CONSTANT-ALPHA-S FROM A STUDY OF W BOSONS PRODUCED IN ASSOCIATION WITH JETS

Author

S. Loucatos, Giancarlo Mantovani, Lydia Iconomidou-Fayard, M. A. Parker, Adele Rimoldi, Marco Fraternali, M. Pepe, C. N. Booth, K. Borer, V. Ruhlmann, G. Sauvage, K. Jacobs, Giovanni Carboni, P. Lariccia, B. Merkel, P. Cenci, H. Zaccone, Valerio Vercesi, Roberto Battiston, J. P. Repellin, M. Banner, A. R. Weidberg, F. Pastore, R. Mollerud, Melody A. Swartz, Steinar Stapnes, J. Schacher, Louis Fayard, P. Darriulat, Allan G Clark, Eric Lancon, T. Pal, B. Hahn, C. Onions, K. Bernlöhr, Kevin Einsweiler, Roberto Ferrari, J. C. Chollet, F. Stocker, Chariclia Petridou, J. M. Gaillard, R. Ansari, Claus Gössling, B. De Lotto, John H. L. Hansen, L. Rasmussen, H. Plothow-Besch, M. Wunsch, D. Froidevaux, A. Roussarie, E. Iacopini, C. Conta, M. Polverel, J. Teiger, Peter Jenni, Vincenzo Cavasinni, P. H. Hansen, T. Del Prete, Paolo Bagnaia, N. Harnew, S. N. Tovey, Livio Mapelli, K. Meier, E. Hugentobler, M. Valdata-Nappi, W.Y. Tsang, L. Di Lella, K. Hara, J. Dines-Hansen, S. Lami, V. G. Goggi, R. Moning, M. Moniez, G. Parrour, Christophe Corona, Michele Livan, M. Morganti, Bruno Mansoulie, K. M. Borghini, E. E. Kluge, B. Madsen, O. Gildemeister, H. Hänni, F. Costantini, and O. Kofoed-Hansen

Subjects
Coupling constant, Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Jet (fluid), Hadron, Elementary particle, law.invention, Nuclear physics, Particle decay, law, High Energy Physics::Experiment, Collider, Particle Physics - Experiment, Boson
Abstract

The UA2 experiment at the CERN p p Collider has identified a total sample of 251 W→eν events. Among this sample 221 events are found without jets and 29 with one jet. The yield of one-jet events relative to that of zero-jet events provides a measurement of the strong coupling constant: αs(Mw2)=0.13±0.03(stat)±0.03±(syst1)±0.02(syst2), where syst1 represents the experimental systematic error and syst2 is an estimate of the theoretical uncertainty.

Published
1988

77. A Search For New Intermediate Vector Bosons and Excited Quarks Decaying To 2-jets At the Cern (p)over-bar-p Collider

Author

ALITTI, J, AMBROSINI, G, ANSARI, R, AUTIERO, D, BAREYRE, P, BERTRAM, I, BLAYLOCK, G, BONAMY, P, BORER, K, BOURLIAUD, M, BUSKULIC, D, CARBONI, G, CAVALLI, D, CAVASINNI, V, CENCI, P, CHOLLET, J, CONTA, C, COSTA, G, COSTANTINI, F, COZZI, L, CRAVERO, A, CURATOLO, M, DELLACQUA, A, DELPRETE, T, DEWOLF, R, DILELLA, L, DUCROS, Y, EGAN, G, EINSWEILER, K, ESPOSITO, B, FAYARD, L, FEDERSPIEL, A, FERRARI, R, FRATERNALI, M, FROIDEVAUX, D, FUMAGALLI, G, GAILLARD, J, GIANOTTI, F, GILDEMEISTER, O, GOSSLING, C, GOGGI, V, GRUNENDAHL, S, HARA, K, HELLMAN, S, HRIVNAC, J, HUFNAGEL, H, HUGENTOBLER, E, HULTQVIST, K, IACOPINI, E, INCANDELA, J, JAKOBS, K, JENNI, P, KLUGE, E, KURZ, N, LAMI, S, LARICCIA, P, LEFEBVRE, M, LINSSEN, L, LIVAN, M, LUBRANO, P, MAGNEVILLE, C, MALGERI, L, MANDELLI, L, MAPELLI, L, MAZZANTI, M, MEIER, K, MERKEL, B, MEYER, J, MONIEZ, M, MONING, R, MORGANTI, M, MULLER, L, MUNDAY, D, NESSI, M, NESSITEDALDI, F, ONIONS, C, PAL, T, PARKER, M, PARROUR, G, PASTORE, F, PENNACCHIO, E, PENTNEY, J, PEPE, M, PERINI, L, PETRIDOU, C, PETROFF, P, PLOTHOWBESCH, H, POLESELLO, G, POPPLETON, A, PRETZL, K, PRIMAVERA, M, PUNTURO, M, REPELLIN, J, RIMOLDI, A, SACCHI, M, SCAMPOLI, P, SCHACHER, J, SCHMIDT, B, SIMAK, V, SINGH, S, SONDERMANN, V, SPIWOKS, R, STAPNES, S, TALAMONTI, C, TONDINI, F, TOVEY, S, TSESMELIS, E, UNAL, G, VALDATANAPPI, M, VERCESI, V, WEIDBERG, A, WELLS, P, WHITE, T, WOOD, D, WOTTON, S, ZACCONE, H, ZYLBERSTEJN, A, J., Alitti, G., Ambrosini, R., Ansari, D., Autiero, P., Bareyre, I. A., Bertram, G., Blaylock, P., Bonamy, K., Borer, M., Bourliaud, D., Buskulic, G., Carboni, D., Cavalli, V., Cavasinni, P., Cenci, J. C., Chollet, C., Conta, G., Costa, F., Costantini, L., Cozzi, A., Cravero, M., Curatolo, A., Dellacqua, T., Delprete, R. S., Dewolf, L., Dilella, Y., Ducro, G. F., Egan, K. F., Einsweiler, B., Esposito, L., Fayard, A., Federspiel, R., Ferrari, M., Fraternali, D., Froidevaux, G., Fumagalli, J. M., Gaillard, F., Gianotti, O., Gildemeister, C., Gossling, V. G., Goggi, S., Grunendahl, K., Hara, S., Hellman, J., Hrivnac, H., Hufnagel, E., Hugentobler, K., Hultqvist, E., Iacopini, J., Incandela, K., Jakob, P., Jenni, E. E., Kluge, N., Kurz, S., Lami, P., Lariccia, M., Lefebvre, L., Linssen, M., Livan, P., Lubrano, C., Magneville, L., Malgeri, L., Mandelli, L., Mapelli, M., Mazzanti, K., Meier, B., Merkel, J. P., Meyer, M., Moniez, R., Moning, M., Morganti, L., Muller, D. J., Munday, M., Nessi, F., Nessitedaldi, C., Onion, T., Pal, M. A., Parker, G., Parrour, F., Pastore, E., Pennacchio, J. M., Pentney, M., Pepe, L., Perini, C., Petridou, P., Petroff, H., Plothowbesch, G., Polesello, A., Poppleton, K., Pretzl, M., Primavera, M., Punturo, J. P., Repellin, A., Rimoldi, M., Sacchi, Scampoli, Paola, J., Schacher, B., Schmidt, V., Simak, S. L., Singh, V., Sondermann, R., Spiwok, S., Stapne, C., Talamonti, F., Tondini, S. N., Tovey, E., Tsesmeli, G., Unal, M., Valdatanappi, V., Vercesi, A. R., Weidberg, P. S., Well, T. O., White, D. R., Wood, S. A., Wotton, H., Zaccone, and A., Zylberstejn

Subjects
Condensed Matter::Quantum Gases, LUND MONTE-CARLO, High Energy Physics::Phenomenology, HADRONIC PROCESSES, JETS, High Energy Physics::Experiment
Abstract

The two-jet invariant mass spectrum as measured in the UA2 experiment is used to search for additional heavy vector bosons decaying to two-jets. The mass of an additional W boson that couples to fermions with a V + A form is constrained to be greater than 261 GeV to the 90% confidence level. A limit on the production cross section of additional W and Z bosons is given as a function of the boson mass. A limit on the production of excited quarks is also given as a function of the excited quark mass.

Published
1993

78. Measurement of the Gluon Structure-function From Direct Photon Data At the Cern (p)over-bar-p Collider

Author

Alitti, J., Ambrosini, G., Ansari, R., Autiero, D., Bareyre, P., Bertram, Ia, Blaylock, G., Bonamy, P., Borer, K., Bourliaud, M., Buskulic, D., Carboni, G., Cavalli, D., Cavasinni, V., Cenci, P., Chollet, Jc, Conta, C., Costa, G., Costantini, F., Cozzi, L., Cravero, A., Curatolo, M., Dellacqua, A., Delprete, T., Dewolf, Rs, Dilella, L., Ducros, Y., Egan, Gf, Einsweiler, Kf, Esposito, B., Fayard, L., Federspiel, A., Ferrari, R., Fraternali, M., Froidevaux, D., Fumagalli, G., Gaillard, Jm, Gianotti, F., Gildemeister, O., Gossling, C., Goggi, Vg, Grunendahl, S., Hara, K., Hellman, S., Hrivnac, J., Hufnagel, H., Hugentobler, E., Hultqvist, K., Enrico Iacopini, Incandela, J., Jacobs, K., Jenni, P., Kluge, Ee, Kurz, N., Lami, S., Lariccia, P., Lefebvre, M., Linssen, L., Livan, M., Lubrano, P., Magneville, C., Malgeri, L., Mandelli, L., Mapelli, L., Mazzanti, M., Meier, K., Merkel, B., Meyer, Jp, Moniez, M., Moning, R., Morganti, M., Muller, L., Munday, Dj, Nessi, M., Nessitedaldi, F., Onions, C., Pal, T., Parker, Ma, Parrour, G., Pastore, F., Pennacchio, E., Pentney, Jm, Pepe, M., Perini, L., Petridou, C., Petroff, P., Plothowbesch, H., Polesello, G., Poppleton, A., Pretzl, K., Primavera, M., Punturo, M., Repellin, Jp, Rimoldi, A., Sacchi, M., Scampoli, P., Schacher, J., Schmidt, B., Simak, V., Singh, Sl, Sondermann, V., Spiwoks, R., Stapnes, S., Cinzia Talamonti, Tondini, F., Tovey, Sn, Tsesmelis, E., Unal, G., Valdatanappi, M., Vercesi, V., Weidberg, Ar, Wells, Ps, White, To, Wood, Dr, Wotton, Sa, Zaccone, H., Zylberstejn, A., J., Alitti, G., Ambrosini, R., Ansari, D., Autiero, P., Bareyre, I. A., Bertram, G., Blaylock, P., Bonamy, K., Borer, M., Bourliaud, D., Buskulic, G., Carboni, D., Cavalli, V., Cavasinni, P., Cenci, J. C., Chollet, C., Conta, G., Costa, F., Costantini, L., Cozzi, A., Cravero, M., Curatolo, A., Dellacqua, T., Delprete, R. S., Dewolf, L., Dilella, Y., Ducro, G. F., Egan, K. F., Einsweiler, B., Esposito, L., Fayard, A., Federspiel, R., Ferrari, M., Fraternali, D., Froidevaux, G., Fumagalli, J. M., Gaillard, F., Gianotti, O., Gildemeister, C., Gossling, V. G., Goggi, S., Grunendahl, K., Hara, S., Hellman, J., Hrivnac, H., Hufnagel, E., Hugentobler, K., Hultqvist, E., Iacopini, J., Incandela, K., Jacob, P., Jenni, E. E., Kluge, N., Kurz, S., Lami, P., Lariccia, M., Lefebvre, L., Linssen, M., Livan, P., Lubrano, C., Magneville, L., Malgeri, L., Mandelli, L., Mapelli, M., Mazzanti, K., Meier, B., Merkel, J. P., Meyer, M., Moniez, R., Moning, M., Morganti, L., Muller, D. J., Munday, M., Nessi, F., Nessitedaldi, C., Onion, T., Pal, M. A., Parker, G., Parrour, F., Pastore, E., Pennacchio, J. M., Pentney, M., Pepe, L., Perini, C., Petridou, P., Petroff, H., Plothowbesch, G., Polesello, A., Poppleton, K., Pretzl, M., Primavera, M., Punturo, J. P., Repellin, A., Rimoldi, M., Sacchi, Scampoli, Paola, J., Schacher, B., Schmidt, V., Simak, S. L., Singh, V., Sondermann, R., Spiwok, S., Stapne, C., Talamonti, F., Tondini, S. N., Tovey, E., Tsesmeli, G., Unal, M., Valdatanappi, V., Vercesi, A. R., Weidberg, P. S., Well, T. O., White, D. R., Wood, S. A., Wotton, H., Zaccone, and A., Zylberstejn

Subjects
SCINTILLATING FIBER DETECTOR, STRUCTURE-FUNCTION F2(X
Abstract

A measurement of the gluon structure fusion using direct photon events observed with the UA2 detector in ppBAR collisions at square-root s = 630 GeV is presented. The x-range covered by this analysis is between 0.049 and 0.207 and the Q2 range is between 280 GeV2 and 3670 GeV2. The data sample corresponds to an integrated luminosity of 7.14 pb-1. The results are found to be in good agreement with the gluon distributions measured in deep inelastic scattering experiments extrapolated to the UA2 Q2 values.

Published
1993

79. Direct Measurement of the W-gamma Coupling At the Cern Pbarp Collider

Author

ALITTI, J, AMBROSINI, G, ANSARI, R, AUTIERO, D, BAREYRE, P, BERTRAM, I, BLAYLOCK, G, BONAMY, P, BORER, K, BOURLIAUD, M, BUSKULIC, D, CARBONI, G, CAVALLI, D, CAVASINNI, V, CENCI, P, CHOLLET, J, CONTA, C, COSTA, G, COSTANTINI, F, COZZI, L, CRAVERO, A, CURATOLO, M, DELLACQUA, A, DELPRETE, T, DEWOLF, R, DILELLA, L, DUCROS, Y, EGAN, G, EINSWEILER, K, ESPOSITO, B, FAYARD, L, FEDERSPIEL, A, FERRARI, R, FRATERNALI, M, FROIDEVAUX, D, FUMAGALLI, G, GAILLARD, J, GIANOTTI, F, GILDEMEISTER, O, GOSSLING, C, GOGGI, V, GRUNENDAHL, S, HARA, K, HELLMAN, S, HRIVNAC, J, HUFNAGEL, H, HUGENTOBLER, E, HULTQVIST, K, IACOPINI, E, INCANDELA, J, JAKOBS, K, JENNI, P, KLUGE, E, KURZ, N, LAMI, S, LARICCIA, P, LEFEBVRE, M, LINSSEN, L, LIVAN, M, LUBRANO, P, MAGNEVILLE, C, MANDELLI, L, MAPELLI, L, MAZZANTI, M, MEIER, K, MERKEL, B, MEYER, J, MONIEZ, M, MONING, R, MORGANTI, M, MULLER, L, MUNDAY, D, NESSI, M, NESSITEDALDI, F, ONIONS, C, PAL, T, PARKER, M, PARROUR, G, PASTORE, F, PENNACCHIO, E, PENTNEY, J, PEPE, M, PERINI, L, PETRIDOU, C, PETROFF, P, PLOTHOWBESCH, H, POLESELLO, G, POPPLETON, A, PRETZL, K, PRIMAVERA, M, PUNTURO, M, REPELLIN, J, RIMOLDI, A, SACCHI, M, SCAMPOLI, P, SCHACHER, J, SCHMIDT, B, SIMAK, V, SINGH, S, SONDERMANN, V, SPIWOKS, R, STAPNES, S, TALAMONTI, C, TONDINI, F, TOVEY, S, TSESMELIS, E, UNAL, G, VALDATANAPPI, M, VERCESI, V, WEIDBERG, A, WELLS, P, WHITE, T, WOOD, D, WOTTON, S, ZACCONE, H, ZYLBERSTEJN, A, J., Alitti, G., Ambrosini, R., Ansari, D., Autiero, P., Bareyre, I. A., Bertram, G., Blaylock, P., Bonamy, K., Borer, M., Bourliaud, D., Buskulic, G., Carboni, D., Cavalli, V., Cavasinni, P., Cenci, J. C., Chollet, C., Conta, G., Costa, F., Costantini, L., Cozzi, A., Cravero, M., Curatolo, A., Dellacqua, T., Delprete, R. S., Dewolf, L., Dilella, Y., Ducro, G. F., Egan, K. F., Einsweiler, B., Esposito, L., Fayard, A., Federspiel, R., Ferrari, M., Fraternali, D., Froidevaux, G., Fumagalli, J. M., Gaillard, F., Gianotti, O., Gildemeister, C., Gossling, V. G., Goggi, S., Grunendahl, K., Hara, S., Hellman, J., Hrivnac, H., Hufnagel, E., Hugentobler, K., Hultqvist, E., Iacopini, J., Incandela, K., Jakob, P., Jenni, E. E., Kluge, N., Kurz, S., Lami, P., Lariccia, M., Lefebvre, L., Linssen, M., Livan, P., Lubrano, C., Magneville, L., Mandelli, L., Mapelli, M., Mazzanti, K., Meier, B., Merkel, J. P., Meyer, M., Moniez, R., Moning, M., Morganti, L., Muller, D. J., Munday, M., Nessi, F., Nessitedaldi, C., Onion, T., Pal, M. A., Parker, G., Parrour, F., Pastore, E., Pennacchio, J. M., Pentney, M., Pepe, L., Perini, C., Petridou, P., Petroff, H., Plothowbesch, G., Polesello, A., Poppleton, K., Pretzl, M., Primavera, M., Punturo, J. P., Repellin, A., Rimoldi, M., Sacchi, Scampoli, Paola, J., Schacher, B., Schmidt, V., Simak, S. L., Singh, V., Sondermann, R., Spiwok, S., Stapne, C., Talamonti, F., Tondini, S. N., Tovey, E., Tsesmeli, G., Unal, M., Valdatanappi, V., Vercesi, A. R., Weidberg, P. S., Well, T. O., White, D. R., Wood, S. A., Wotton, H., Zaccone, and A., Zylberstejn

Subjects
CHARGED WEAK BOSON, UA2 EXPERIMENT, ANOMALOUS MAGNETIC-MOMENT, SCINTILLATING FIBER DETECTOR
Abstract

The process ppBAR --> e-nu-gamma + X is studied as square-root s = 630 GeV. The observed signal is used to extract a direct measurement of the parameters-kappa and lambda which define the magnetic dipole and electric quadrupole moments of the W boson and therefore the WW-gamma coupling. We find kappa = 1(-2.2)+2.6 and lambda = 0(-1.8)+1.7 and their 95% confidence limits -3.5 < kappa < 5.9 and -3.6 < lambda < 3.5. The results are model independent and in good agreement with the standard model values, kappa = 1 and lambda = 0.

Published
1992

80. A Search For Scalar Leptoquarks At the Cern Pbarp Collider

Author

Alitti, J, Ambrosini, G, Ansari, R, Autiero, D, Bareyre, P, Bertram, Ia, Blaylock, G, Bonamy, P, Borer, K, Bourliaud, M, Buskulic, D, Carboni, G, Cavalli, D, Cavasinni, Vincenzo, Cenci, P, Chollet, Jc, Conta, C, Costa, G, Costantini, Flavio, Cozzi, L, Cravero, A, Curatolo, M, Dellacqua, A, Delprete, T, Dewolf, Rs, Dilella, L, Ducros, Y, Egan, Gf, Einsweiler, Kf, Esposito, B, Fayard, L, Federspiel, A, Ferrari, R, Fraternali, M, Froidevaux, D, Fumagalli, G, Gaillard, Jm, Gianotti, F, Gildemeister, O, Gossling, C, Goggi, Vg, Grunendahl, S, Hara, K, Hellman, S, Hrivnac, J, Hufnagel, H, Hugentobler, E, Hultqvist, K, Iacopini, E, Incandela, J, Jakobs, K, Jenni, P, Kluge, Ee, Kurz, N, Lami, S, Lariccia, P, Lefebvre, M, Linssen, L, Livan, M, Lubrano, P, Magneville, C, Mandelli, L, Mapelli, L, Mazzanti, M, Meier, K, Merkel, B, Meyer, Jp, Moniez, M, Moning, R, Morganti, M, Muller, L, Munday, Dj, Nessi, M, Nessitedaldi, F, Onions, C, Pal, T, Parker, Ma, Parrour, G, Pastore, F, Pennacchio, E, Pentney, Jm, Pepe, M, Perini, L, Petridou, C, Petroff, P, Plothowbesch, H, Polesello, G, Poppleton, A, Pretzl, K, Primavera, M, Punturo, M, Repellin, Jp, Rimoldi, A, Sacchi, M, Scampoli, P, Schacher, J, Schmidt, B, Simak, V, Singh, Sl, Sondermann, V, Spiwoks, R, Stapnes, S, Talamonti, C, Tondini, F, Tovey, Sn, Tsesmelis, E, Unal, G, Valdatanappi, M, Vercesi, V, Weidberg, Ar, Wells, Ps, White, To, Wood, Dr, Wotton, Sa, Zaccone, H, Zylberstejn, A., J., Alitti, G., Ambrosini, R., Ansari, D., Autiero, P., Bareyre, I. A., Bertram, G., Blaylock, P., Bonamy, K., Borer, M., Bourliaud, D., Buskulic, G., Carboni, D., Cavalli, V., Cavasinni, P., Cenci, J. C., Chollet, C., Conta, G., Costa, F., Costantini, L., Cozzi, A., Cravero, M., Curatolo, A., Dellacqua, T., Delprete, R. S., Dewolf, L., Dilella, Y., Ducro, G. F., Egan, K. F., Einsweiler, B., Esposito, L., Fayard, A., Federspiel, R., Ferrari, M., Fraternali, D., Froidevaux, G., Fumagalli, J. M., Gaillard, F., Gianotti, O., Gildemeister, C., Gossling, V. G., Goggi, S., Grunendahl, K., Hara, S., Hellman, J., Hrivnac, H., Hufnagel, E., Hugentobler, K., Hultqvist, E., Iacopini, J., Incandela, K., Jakob, P., Jenni, E. E., Kluge, N., Kurz, S., Lami, P., Lariccia, M., Lefebvre, L., Linssen, M., Livan, P., Lubrano, C., Magneville, L., Mandelli, L., Mapelli, M., Mazzanti, K., Meier, B., Merkel, J. P., Meyer, M., Moniez, R., Moning, M., Morganti, L., Muller, D. J., Munday, M., Nessi, F., Nessitedaldi, C., Onion, T., Pal, M. A., Parker, G., Parrour, F., Pastore, E., Pennacchio, J. M., Pentney, M., Pepe, L., Perini, C., Petridou, P., Petroff, H., Plothowbesch, G., Polesello, A., Poppleton, K., Pretzl, M., Primavera, M., Punturo, J. P., Repellin, A., Rimoldi, M., Sacchi, Scampoli, Paola, J., Schacher, B., Schmidt, V., Simak, S. L., Singh, V., Sondermann, R., Spiwok, S., Stapne, C., Talamonti, F., Tondini, S. N., Tovey, E., Tsesmeli, G., Unal, M., Valdatanappi, V., Vercesi, A. R., Weidberg, P. S., Well, T. O., White, D. R., Wood, S. A., Wotton, H., Zaccone, and A., Zylberstejn

Subjects
W-BOSONS, Physics::Instrumentation and Detectors, LUND MONTE-CARLO, High Energy Physics::Phenomenology, UA2 EXPERIMENT, JETS, High Energy Physics::Experiment
Abstract

A search has been made for scalar leptoquark pair production with the upgraded UA2 detector at the CERN ppBAR Coolider at square-root s = 630 GeV, investigating decays of the leptoquark into a quark and either an electron or an electron neutrino. From an event sample corresponding to an integrated luminosity of 13 pb-1 a lower limit has been determined for the mass of first generation leptoquarks, yielding 67 GeV (95% CL) for a scalar leptoquark decaying with a 50% branching ratio into a quark and an electron.

Published
1992

81. Experimental Limit On the Decay W+--]pi+-gamma At the Cern Pbarp Collider

Author

Alitti, J, Ambrosini, G, Ansari, R, Autiero, D, Bareyre, P, Bertram, Ia, Blaylock, G, Bonamy, P, Borer, K, Bourliaud, M, Buskulic, D, Carboni, G, Cavalli, D, Cavasinni, Vincenzo, Cenci, P, Chollet, Jc, Conta, C, Costa, G, Costantini, Flavio, Cozzi, L, Cravero, A, Curatolo, M, Dellacqua, A, Delprete, T, Dewolf, Rs, Dilella, L, Ducros, Y, Egan, Gf, Einsweiler, Kf, Esposito, B, Fayard, L, Federspiel, A, Ferrari, R, Fraternali, M, Froidevaux, D, Fumagalli, G, Gaillard, Jm, Gianotti, F, Gildemeister, O, Gossling, C, Goggi, Vg, Grunendahl, S, Hara, K, Hellman, S, Hrivnac, J, Hufnagel, H, Hugentobler, E, Hultqvist, K, Iacopini, E, Incandela, J, Jakobs, K, Jenni, P, Kluge, Ee, Kurz, N, Lami, S, Lariccia, P, Lefebvre, M, Linssen, L, Livan, M, Lubrano, P, Magneville, C, Mandelli, L, Mapelli, L, Mazzanti, M, Meier, K, Merkel, B, Meyer, Jp, Moniez, M, Moning, R, Morganti, M, Muller, L, Munday, Dj, Nessi, M, Nessitedaldi, F, Onions, C, Pal, T, Parker, Ma, Parrour, G, Pastore, F, Pennacchio, E, Pentney, Jm, Pepe, M, Perini, L, Petridou, C, Petroff, P, Plothowbesch, H, Polesello, G, Poppleton, A, Pretzl, K, Primavera, M, Punturo, M, Repellin, Jp, Rimoldi, A, Sacchi, M, Scampoli, P, Schacher, J, Schmidt, B, Simak, V, Singh, Sl, Sondermann, V, Spiwoks, R, Stapnes, S, Talamonti, C, Tondini, F, Tovey, Sn, Tsesmelis, E, Unal, G, Valdatanappi, M, Vercesi, V, Weidberg, Ar, Wells, Ps, White, To, Wood, Dr, Wotton, Sa, Zaccone, H, Zylberstejn, A., J., Alitti, G., Ambrosini, R., Ansari, D., Autiero, P., Bareyre, I. A., Bertram, G., Blaylock, P., Bonamy, K., Borer, M., Bourliaud, D., Buskulic, G., Carboni, D., Cavalli, V., Cavasinni, P., Cenci, J. C., Chollet, C., Conta, G., Costa, F., Costantini, L., Cozzi, A., Cravero, M., Curatolo, A., Dellacqua, T., Delprete, R. S., Dewolf, L., Dilella, Y., Ducro, G. F., Egan, K. F., Einsweiler, B., Esposito, L., Fayard, A., Federspiel, R., Ferrari, M., Fraternali, D., Froidevaux, G., Fumagalli, J. M., Gaillard, F., Gianotti, O., Gildemeister, C., Gossling, V. G., Goggi, S., Grunendahl, K., Hara, S., Hellman, J., Hrivnac, H., Hufnagel, E., Hugentobler, K., Hultqvist, E., Iacopini, J., Incandela, K., Jakob, P., Jenni, E. E., Kluge, N., Kurz, S., Lami, P., Lariccia, M., Lefebvre, L., Linssen, M., Livan, P., Lubrano, C., Magneville, L., Mandelli, L., Mapelli, M., Mazzanti, K., Meier, B., Merkel, J. P., Meyer, M., Moniez, R., Moning, M., Morganti, L., Muller, D. J., Munday, M., Nessi, F., Nessitedaldi, C., Onion, T., Pal, M. A., Parker, G., Parrour, F., Pastore, E., Pennacchio, J. M., Pentney, M., Pepe, L., Perini, C., Petridou, P., Petroff, H., Plothowbesch, G., Polesello, A., Poppleton, K., Pretzl, M., Primavera, M., Punturo, J. P., Repellin, A., Rimoldi, M., Sacchi, Scampoli, Paola, J., Schacher, B., Schmidt, V., Simak, S. L., Singh, V., Sondermann, R., Spiwok, S., Stapne, C., Talamonti, F., Tondini, S. N., Tovey, E., Tsesmeli, G., Unal, M., Valdatanappi, V., Vercesi, A. R., Weidberg, P. S., Well, T. O., White, D. R., Wood, S. A., Wotton, H., Zaccone, and A., Zylberstejn

Subjects
UA2 EXPERIMENT, SCINTILLATING FIBER DETECTOR
Abstract

Results are given on a search for the decay W+/- --> pi+/--gamma with the UA2 detector in ppBAR collisions at square-root s = 630 GeV. No signal for such a process is observed and upper limits on the ratio R = GAMMA(W+/- --> pi+/--gamma)/GAMMA(W+/- --> e+/--nu) < 4.9 x 10(-3) and on the branching ratio BR(W+/- --> pi+/--gamma) < 5.4 x 10(-4) are derived at 95% confidence level.

Published
1992

82. Measurement of W-production and Z-production Cross-sections At the Cern Pbarp Collider

Author

Alitti, J, Ansari, R, Ansorge, Re, Bagnaia, P, Bareyre, P, Blaylock, G, Bonamy, P, Bonesini, M, Booth, Cn, Borer, K, Buskulic, D, Carboni, G, Cavalli, D, Cavasinni, Vincenzo, Cenci, P, Chollet, Jc, Conta, C, Costa, G, Costantini, Flavio, Crittenden, J, Dellacqua, A, Delotto, B, Delprete, T, Dewolf, Rs, Dilella, L, Egan, Gf, Einsweiler, Kf, Fayard, L, Federspiel, A, Ferrari, R, Fraternali, M, Froidevaux, D, Fumagalli, G, Gaillard, Jm, Gianotti, F, Gildemeister, O, Gossling, C, Goggi, Vg, Grunendahl, S, Hara, K, Hellman, S, Hugentobler, E, Hultqvist, K, Iacopini, E, Incandela, J, Jakobs, K, Jenni, P, Kluge, Ee, Kurz, N, Lami, S, Lariccia, P, Lefebvre, M, Linssen, L, Lisowski, B, Livan, M, Lubrano, P, Magneville, C, Mandelli, L, Mapelli, L, Mazzanti, M, Meier, K, Merkel, B, Meyer, Jp, Moniez, M, Moning, R, Morganti, M, Muller, L, Munday, Dj, Onions, C, Pal, T, Parker, Ma, Parrour, G, Pastore, F, Pennacchio, E, Pentney, Jm, Pepe, M, Perini, L, Petridou, C, Petroff, P, Plothowbesch, H, Polesello, G, Poppleton, A, Punturo, M, Rasmussen, L, Repellin, Jp, Rimoldi, A, Rushbrooke, Jg, Scampoli, P, Schacher, J, Singh, Sl, Stapnes, S, Stirling, Av, Tondini, F, Tovey, Sn, Tsesmelis, E, Valdatanappi, M, Vercesi, V, Weidberg, Ar, Wells, Ps, White, To, Wood, Dr, Wotton, Sa, Zaccone, H., J., Alitti, R., Ansari, R. E., Ansorge, P., Bagnaia, P., Bareyre, G., Blaylock, P., Bonamy, M., Bonesini, C. N., Booth, K., Borer, D., Buskulic, G., Carboni, D., Cavalli, V., Cavasinni, P., Cenci, J. C., Chollet, C., Conta, G., Costa, F., Costantini, J., Crittenden, A., Dellacqua, B., Delotto, T., Delprete, R. S., Dewolf, L., Dilella, G. F., Egan, K. F., Einsweiler, L., Fayard, A., Federspiel, R., Ferrari, M., Fraternali, D., Froidevaux, G., Fumagalli, J. M., Gaillard, F., Gianotti, O., Gildemeister, C., Gossling, V. G., Goggi, S., Grunendahl, K., Hara, S., Hellman, E., Hugentobler, K., Hultqvist, E., Iacopini, J., Incandela, K., Jakob, P., Jenni, E. E., Kluge, N., Kurz, S., Lami, P., Lariccia, M., Lefebvre, L., Linssen, B., Lisowski, M., Livan, P., Lubrano, C., Magneville, L., Mandelli, L., Mapelli, M., Mazzanti, K., Meier, B., Merkel, J. P., Meyer, M., Moniez, R., Moning, M., Morganti, L., Muller, D. J., Munday, C., Onion, T., Pal, M. A., Parker, G., Parrour, F., Pastore, E., Pennacchio, J. M., Pentney, M., Pepe, L., Perini, C., Petridou, P., Petroff, H., Plothowbesch, G., Polesello, A., Poppleton, M., Punturo, L., Rasmussen, J. P., Repellin, A., Rimoldi, J. G., Rushbrooke, Scampoli, Paola, J., Schacher, S. L., Singh, S., Stapne, A. V., Stirling, F., Tondini, S. N., Tovey, E., Tsesmeli, M., Valdatanappi, V., Vercesi, A. R., Weidberg, P. S., Well, T. O., White, D. R., Wood, S. A., Wotton, and H., Zaccone

Published
1990

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