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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.
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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.
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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 0.1
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Comparison of light quark and charm quark fragmentation

Physics Letters B 161:4-6 (1985) 412-416

Authors:

P Kesten, C Akerlof, G Bonvicini, J Chapman, D Errede, N Harnew, DI Meyer, D Nitz, AA Seidl, R Thun, T Trinko, M Willutzky, M Derrick, P Kooijman, JS Loos, B Musgrave, LE Price, JS 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, S Abachi, I Beltrami, BG Bylsma, R DeBonte, KK Gan, FJ Loeffler, EH Low, RL McIlwain, DH Miller, CR Ng, LK Rangan, EI Shibata, B Cork

Abstract:

Separate samples of charm quark and light quark (u, d, s) jets have been isolated in an experiment studying e+e- annihilations at s = 29 GeV. The results come from data corresponding to an integrated luminosity of 111 pb-1 collected by the High Resolution Spectrometer. Differences were observed in charged multiplicities, momentum distributions, and rapidity of the size expected from the different fragmentation functions and leading particle decay properties of the two samples. © 1985.
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Measurement of the s dependence of jet production at the CERN pp collider

Physics Letters B 160:4-5 (1985) 349-356

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, A Codino, 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, G Parrour, F Pastore, M Pepe, H Plothow-Besch, M Polverel, A Putzer, LO Rasmussen, JP Repellin, A Rimoldi, AF Rothenberg, A Roussarie, V Ruhlmann, G Sauvage, J Schacher, M Schlötelburg, F Stocker, M Swartz, J Teiger, K Tittel, SN Tovey, WY Tsang, M Valdata-Nappi, V Vercesi, AR Weidberg, M Wunsch, H Zaccone

Abstract:

The production of very large transverse momentum (pT) hadron jets has been measured in the UA2 experiment at the CERN pp Collider for s=630 GeV. The inclusive jet production cross sections exhibit a pT-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 xT=2pT/√s scaling. No significant deviation of the data from QCD predictions is observed at very large pT, placing a lower limit on the characteristic scale Λc of a hypothetical superstrong contact interaction responsible for the binding of preons in the quark (Λc>370 GeV at 95% CL). © 1985.
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