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A STUDY OF 3-JET EVENTS AT THE CERN PP COLLIDER

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS 30:3 (1986) 341-353

Authors:

JA APPEL, P BAGNAIA, M BANNER, R BATTISTON, K BERNLOHR, K BORER, M BORGHINI, J BURGER, G CARBONI, V CAVASINNI, P CENCI, JC CHOLLET, AG CLARK, A CODINO, C CONTA, P DARRIULAT, B DELOTTO, T DELPRETE, L DILELLA, J DINESHANSEN, K EINSWEILER, R ENGELMANN, L FAYARD, M FRATERNALI, D FROIDEVAUX, JM GAILLARD, O GILDEMEISTER, VG GOGGI, C GOSSLING, B HAHN, H HANNI, JR HANSEN, P HANSEN, N HARNEW, T HIMEL, L ICONOMIDOUFAYARD, K JAKOBS, P JENNI, EE KLUGE, O KOFOEDHANSEN, E LANCON, M LIVAN, S LOUCATOS, B MADSEN, P MANI, B MANSOULIE, GC MANTOVANI, L MAPELLI, K MEIER, B MERKEL, R MOLLERUD, M MONIEZ, R MONING, M MORGANTI, C ONIONS, MA PARKER, G PARROUR, F PASTORE, M PEPE, H PLOTHOWBESCH, M POLVEREL, JP REPELLIN, A RIMOLDI, AF ROTHENBERG, A ROUSSARIE, V RUHLMANN, G SAUVAGE, J SCHACHER, M SCHLOTELBURG, F STOCKER, M SWARTZ, J TEIGER, SN TOVEY, WY TSANG, M VALDATANAPPI, V VERCESI, AR WEIDBERG, M WUNSCH, H ZACCONE

MEASUREMENT OF W+/- AND Z0 PROPERTIES AT THE CERN PBARP COLLIDER

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS 30:1 (1986) 1-22

Authors:

JA APPEL, P BAGNAIA, M BANNER, R BATTISTON, K BERNLOHR, K BORER, M BORGHINI, G CARBONI, V CAVASINNI, P CENCI, JC CHOLLET, AG CLARK, A CODINO, C CONTA, P DARRIULAT, B DELOTTO, T DELPRETE, L DILELLA, J DINESHANSEN, K EINSWEILER, R ENGELMANN, L FAYARD, M FRATERNALI, D FROIDEVAUX, JM GAILLARD, O GILDEMEISTER, VG GOGGI, C GOSSLING, B HAHN, H HANNI, JR HANSEN, P HANSEN, N HARNEW, T HIMEL, L ICONOMIDOUFAYARD, K JAKOBS, P JENNI, EE KLUGE, O KOFOEDHANSEN, E LANCON, M LIVAN, S LOUCATOS, B MADSEN, P MANI, B MANSOULIE, GC MANTOVANI, L MAPELLI, K MEIER, B MERKEL, R MOLLERUD, M MONIEZ, R MONING, M MORGANTI, B NILSSON, C ONIONS, MA PARKER, G PARROUR, F PASTORE, M PEPE, H PLOTHOWBESCH, M POLVEREL, A PUTZER, JP REPELLIN, AF ROTHENBERG, A ROUSSARIE, V RUHLMANN, G SAUVAGE, J SCHACHER, M SCHLOTELBURG, F STOCKER, M SWARTZ, J TEIGER, K TITTEL, SN TOVEY, WY TSANG, M VALDATANAPPI, V VERCESI, AR WEIDBERG, M WUNSCH, H ZACCONE

Comparison of charged particle multiplicities in quark and gluon jets produced in e+e- annihilation at 29 GeV

Physics Letters B 165:4-6 (1985) 449-453

Authors:

M Derrick, KK Gan, P Kooijman, JS Loos, B Musgrave, LE Price, J Schlereth, K Sugano, JM Weiss, DE Wood, D Blockus, B Brabson, SW Gray, C Jung, H Neal, H Ogren, DR Rust, M Valdata-Nappi, C Akerlof, G Bonvicini, J Chapman, D Errede, N Harnew, P Kesten, DI Meyer, D Nitz, AA Seidl, R Thun, T Trinko, M Willutzky, S Abachi, P Baringer, I Beltrami, BG Bylsma, R Debonte, D Koltick, FJ Loeffler, EH Low, RL McIlwain, DH Miller, CR Ng, LK Rangan, EI Shibata, B Cork

Abstract:

The charged particle multiplicities of the quark and gluon jets in the three-fold symmetric e+e- → qqg events at √s = 29 GeV have been studied using the high resolution spectrometer at PEP. A value of 〈n〉g = 6.7-2.1+1.1±1.0 for gluon jet s with an energy of 9.7-2.0+1.5 GeV is measured. The ratio, 〈n〉g/〈n〉q, is 1.29-0.41+0.21±0.20, which i s significantly lower than the value of 9 4 naively expected from the ration of the gluon-to-quark color charges. © 1985.

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

Physics Letters B 165:4-6 (1985) 441-448

Authors:

JA Appel, P Bagnaia, M Banner, R Battiston, K Bernlöhr, K Borer, M Borghini, G Carboni, V Cavasinni, P Cenci, JC Chollet, AG Clark, C Conta, P Darriulat, B De Lotto, T Del Prete, L Di Lella, J Dines-Hansen, K Einsweiler, 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, L Iconomidou-Fayard, P Jenni, EE Kluge, O Kofoed-Hansen, E Lançon, M Livan, S Loucatos, B Madsen, P Mani, B Mansoulié, GC Mantovani, L Mapelli, K Meier, B Merkel, R Mollerud, M Moniez, R Moning, M Morganti, C Onions, MA Parker, G Parrour, F Pastore, M Pepe, H Plothow-Besch, M Polverel, JP Repellin, A Rimoldi, AF Rothenberg, A Roussarie, V Ruhlmann, G Sauvage, J Schacher, M Schlötelburg, F Stocker, M Swartz, J Teiger, SN Tovey, WY Tsang, M Valdata-Nappi, V Vercesi, AR Weidberg, M Wunsch, H Zaccone

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 pp Collider energies. © 1985.

Inclusive charged particle production near the kinematic limit in e+e- annihilation at 29 GeV

Physics Letters B 164:1-3 (1985) 199-202

Authors:

M Derrick, P Kooijman, JS Loos, B Musgrave, LE Price, J Schlereth, K Sugano, JM Weiss, DE Wood, P Baringer, D Blockus, B Brabson, SW Gray, C Jung, H Neal, H Ogren, DR Rust, M Valdata-Nappi, C Akerlof, G Bonvicini, J Chapman, D Errede, N Harnew, P Kesten, DI Meyer, D Nitz, AA Seidl, R Thun, T Trinko, M Willutzky, S Abachi, I Beltrami, BG Bylsma, R Debonte, KK Gan, D Koltick, FJ Loeffler, EH Low, RL McIlwain, DH Miller, CR Ng, LK Rangan, EI Shibata, B Cork

Abstract:

Inclusive production of charged particles has been studied in e+e- annihilation at ss=29 GeV using the high resolution spectrometer at PEP. Differential cross sections are presented in the range of scaled energy 0.12 behavior predicted by the dimensional counting rules. Comparisons are made with predictions of the Lund string model and the Webber cluster model. © 1985.