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Search for heavy neutral leptons in e+e- annihilations at 29 GeV

Physics Letters B 149:6 (1984) 519-523

Authors:

D Errede, C Akerlof, J Chapman, N Harnew, P Kesten, S Kooijman, DI Meyer, D Nitz, D Rubin, AA Seidl, R Thun, T Trinko, M Willutzky, M Derrick, E Fernandez, R Fries, L Hyman, P Kooijman, JS Loos, B Musgrave, LE Price, J Schlereth, K Sugano, JM Weiss, DE Wood, S Ahlen, G Baranko, P Baringer, D Blockus, B Brabson, M Daigo, GE Forden, SW Gray, JP Guillaud, C Jung, H Neal, H Ogren, D Rust, M Valdata-Nappi, I Beltrami, R DeBonte, KK Gan, D Koltick, FJ Loeffler, U Mallik, RL McIlwain, DH Miller, CR Ng, PP Ong, LK Rangan, EI Shibata, R Stevens, RJ Wilson, B Cork, L Keller, J Va'Vra

Abstract:

A search was made in 29 GeV e+e- annihilations for heavy, neutral leptons decaying to e±X∓(ν), where X is a muon or charged meson. Six events with isolated e±X∓ pairs were found for an intergrated luminosity of 106 pb-1. The expected background is 5.5 ± 2.2 events. Limits on σ s ̇B depend on mass and range from 8 to 20 × 10-5 nb. © 1984.
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Charm quark production and fragmentation in e+e- annihilation at 29 GeV

Physics Letters B 146:3-4 (1984) 261-265

Authors:

M Derrick, E Fernandez, R Fries, L Hyman, P Kooijman, JS Loos, B Musgrave, LE Price, J Schlereth, K Sugano, JM Weiss, DE Wood, S Ahlen, G Baranko, P Baringer, D Blockus, B Brabson, M Daigo, GE Forden, SW Gray, JP Guillaud, C Jung, H Neal, H Ogren, DR Rust, M Valdata-Nappi, C Akerlof, J Chapman, D Errede, N Harnew, P Kesten, S Kooijman, DI Meyer, D Nitz, D Rubin, AA Seidl, R Thun, T Trinko, M Willutzky, I Beltrami, R De Bonte, KK Gan, D Koltick, FJ Loeffler, U Mallik, RL McIlwain, DH Miller, CR Ng, PP Ong, LK Rangan, EI Shibata, R Stevens, RJ Wilson, B Cork, L Keller, J Va'vra

Abstract:

The electroweak production asymmetry and the decay fragmentation function for e+e- → cc have been measured at s = 29 GeV using charged D* production over the full kinematic range. The data were taken at PEP using the High Resolution Spectrometer. The measured asymmetry is -0.12 ± 0.08. The total production cross section in units of the point cross section corrected for initial state radiation is RD* = 2.7 ± 0.9. © 1984.
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Measurement of jet fragmentation properties at the CERN pp Collider

Physics Letters B 144:3-4 (1984) 291-296

Authors:

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

Abstract:

Fragmentation properties of a sample of two-jet events measured by the UA2 detector at the CERN pp 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. © 1984.
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Measurement of jet production properties at the CERN pp Collider

Physics Letters B 144:3-4 (1984) 283-290

Authors:

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

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.
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A study of high transverse momentum electrons produced in {Mathematical expression} collisions at 540 GeV

Zeitschrift für Physik C Particles and Fields 24:1 (1984) 1-17

Authors:

P Bagnaia, M Banner, R Battiston, P Bloch, F Bonaudi, K Borer, M Borghini, J Burger, P Cenci, JC Chollet, AG Clark, C Conta, P Darriulat, L Di Lella, J Dines-Hansch, PA Dorsaz, R Engelmann, L Fayard, M Fraternali, D Froidevaux, G Fumagalli, JM Gaillard, O Gildemeister, VG Goggi, C Gössling, B Hahn, H Hänni, JR Hansen, P Hansen, N Harnew, T Himel, V Hungerbühler, P Jenni, O Kofoed-Hansen, E Lançon, M Livan, S Loucatos, B Madsen, P Mani, B Mansoulié, GC Mantovani, L Mapelli, B Merkel, R Möllerud, B Nilsson, C Onions, G Parrour, F Pastore, H Plothow-Besch, M Polverel, JP Repellin, A Rimoldi, A Rothenberg, A Roussarie, G Sauvage, J Schacher, JL Siegrist, G Stimpfl, F Stocker, M Swartz, J Teiger, S Tovey, V Vercesi, WR Weidberg, H Zaccone, JA Zakrzewski, W Zeller

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.
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