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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. MEASUREMENT OF JET FRAGMENTATION PROPERTIES AT THE CERN PBARP COLLIDER

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Detector, Hadron, Elementary particle, Charged particle, Nuclear physics, Fragmentation (mass spectrometry), Energy flow, High Energy Physics::Experiment, Multiplicity (chemistry)
Abstract

Fragmentation properties of a sample of two-jet events measured by the UA2 detector at the CERN p p Collider are described. The energy flow is compared with different model predictions. The charged particle multiplicity in jets is found to exceed extrapolations from lower energy e+e− jet data.

Published
2016
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3. Direct photon production in $$\bar pp$$ in collisions at $$\sqrt s = 630$$ GeV

Author

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

Subjects
Quantum chromodynamics, Physics, Particle physics, Photon, Physics and Astronomy (miscellaneous), Elementary particle, Transverse momentum, High Energy Physics::Experiment, Production (computer science), Field theory (psychology), Quantum field theory, Nuclear Experiment, Engineering (miscellaneous), Bar (unit)
Abstract

A measurement of the direct production of photons with high transverse momentum from\(\bar pp\) collisions at\(\sqrt s = 630\) GeV is presented. The structure of events containing a high transverse momentum photon is studied. The results support predictions from QCD theory.

Published
1988
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4. Study of electron pairs below the Z0 mass produced in collisions at √s = 540 GeV

Author

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

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Transverse plane, Range (particle radiation), Electron pair, Particle physics, Luminosity (scattering theory), High Energy Physics::Phenomenology, High Energy Physics::Experiment, Electron, Nuclear Experiment, Event (particle physics)
Abstract

From an integrated luminosity of ∫ L d t = 116 nb -1 , 10events are found which contain an electron pair of mass in the range 12 ee GeV c 2 and electron transverse momenta p T e > 5 GeV c . THe sample are described, as well as some featruyres of the The production characteristics of this sample are described, as well as some features of the estimated to be 2.2±0.6 events. The production characteristics of this sample are described, as well as some features of the associated event topology. Comparisons are made with the expectations for such electron pair production from the Drell-Yan mechanism and from the semi-leptonic decay of heavy flavours.

Published
1985
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5. Observation of electrons produced in association with hard jets and large missing transverse momentum in p collisions at

Author

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

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Antiparticle, Particle physics, Luminosity (scattering theory), Astrophysics::High Energy Astrophysical Phenomena, Massless particle, Nuclear physics, Particle decay, Antimatter, High Energy Physics::Experiment, Neutrino, Lepton
Abstract

Using a sample of events collected by UA2 and corresponding to an integrated luminosity of 116 nb −1 . we have searched for electron-“neutrino” pairs in which the transverse momenta of the electron and of the “neutrino” exceed 15 GeV/c and 25 GeV/c respectively. A total of 35 events are observed in low background conditions. Most events can be interpreted in terms of W ± production from QCD processes. Events in which the observation of hard jets makes this interpretation unlikely are described in detail. Possible sources of background contamination are considered.

Published
1984
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6. Observation of very large transverse momentum jets at the CERN p collider

Author

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

Subjects
Azimuth, Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Transverse plane, Large Hadron Collider, Astrophysics::High Energy Astrophysical Phenomena, Pseudorapidity, Transverse momentum, Hadron, High Energy Physics::Experiment, Nuclear Experiment
Abstract

The distribution of total tranverse energy ΣET over the pseudorapidity interval −1 < η < 1 and an azimuthal range Δφ=300° has been measured in the UA2 experiment at the CERN pp collider (s = 540 GeV) using a highly segmented total absorption caloriter. In the events with very large ΣET (ΣET⪆60 GeV) most of the transverse energy is found to be contained in small angular regions as expected for high transverse momentum hadron jets. We discuss the properties of a sample of two-jet events with invariant two-jet masses up to 140 GeVc2 and we measure the cross section for inclusive jet production in the range of jet transverse momenta between 15 and 60 GeVc.

Published
1982
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7. Inclusive charged particle production at the CERN p collider

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Physics::Instrumentation and Detectors, Nuclear Theory, Detector, Charged particle, law.invention, Momentum, Nuclear physics, Transverse plane, Pion, law, Transverse momentum, High Energy Physics::Experiment, Nuclear Experiment, Collider
Abstract

Transverse momentum distributions of pions, kaons and protons have been measured around 90° in the UA2 detector at the SPS p p collider, at a CM energy of 540 GeV. All the cross sections have increased by more than a factor of 2 over those measured at ISR energies and exhibit a flatter behaviour with respect to transverse momentum.

Published
1983
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8. 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
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9. 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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10. 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
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11. 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
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12. 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
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13. 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
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14. 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

15. 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

16. 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

17. 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

18. 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

19. 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

20. 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

21. 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

22. 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

23. 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

24. 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

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