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Measurement of the charged multiplicities in b, c and light quark events from Z0 decays

1996; Elsevier BV; Volume: 386; Issue: 1-4 Linguagem: Inglês

10.1016/0370-2693(96)01025-8

1873-2445

K. Abe, K. Abe, I. Abt, T. Akagi, N. J. Allen, W. W. Ash, D. Aston, K. Baird, C. Baltay, Hr Band, M.B. Barakat, G. Baranko, O. Bardon, T. Barklow, A. O. Bazarko, R. Ben-David, A.C. Benvenuti, G. M. Bilei, D. Bisello, G. Blaylock, J. R. Bogart, B. Bolen, T. Bolton, G.R. Bower, J.E. Brau, M. Breidenbach, W. Bugg, D. Burke, T. H. Burnett, Philip Burrows, W. Busza, A. Calcaterra, D. O. Caldwell, D. Calloway, B. Camanzi, M. Carpinelli, R. Cassell, R. Castaldi, A. Castro, Matteo Cavalli-Sforza, A. Chou, E. Church, H.O. Cohn, J. A. Coller, V. Cook, R. Cotton, R. Cowan, D. G. Coyne, G. Crwaford, A. D’Oliveira, C. Damerell, M. Daoudi, R. de Sangro, R. Dell’Orso, P. Dervan, M. Dima, D. Dong, P. Y. C. Du, R. Dubois, B. I. Eisenstein, R. Elia, E. Etzion, D. Falciai, C. Fan, M.J. Fero, R. Frey, K. Furuno, T. Gillman, G. E. Gladding, S. González de la Hoz, GD Hallewell, E. L. Hart, J.L. Harton, A. Hasan, Y. Hasegawa, K. Hasuko, S. Hedges, S. S. Hertzbach, M. D. Hildreth, Jürgen Huber, M.E. Huffer, E. W. Hughes, H. Hwang, Y. Iwasaki, D.J. Jackson, P. Jacques, J. A. Jaros, Andrew Johnson, J.R. Johnson, R. A. Johnson, T. R. Junk, R. Kajikawa, M. Kalelkar, HJ Kang, I. Karliner, H. Kawahara, Henry W. Kendall, Y.D. Kim, M. King, R. S. B. King, R. Kofler, N. M. Krishna, R. Kroeger, J. Labs, M. Langston, A. Lath, J. Lauber, D. W. G. S. Leith, V. Lia, M. X. Liu, X. Liu, M. Loreti, A. Lu, H.L. Lynch, Jiangang Ma, G. Mancinelli, S. Manly, G. Mantovan, Thomas W. Markiewicz, T. Maruyama, H. Masuda, E. Mazzucato, A.K. McKemey, B. T. Meadows, R. Messner, P. Mockett, KC Moffeit, T. B. Moore, D. Murray, T. Nagamine, S. Narita, U. Nauenberg, H. Neal, M. Nussbaum, Y. Ohnishi, L. S. Osborne, R.S. Panvini, H. Park, T.J. Pavel, I. Peruzzi, M. Piccolo, L. Piemontese, E. Pieroni, K.T. Pitts, R.J. Plano, R. Prepost, C.Y. Prescott, G. D. Punkar, J. Quigley, B. N. Ratcliff, T. W. Reeves, J. Reidy, P. Rensing, L.S. Rochester, P.C. Rowson, J. J. Russell, O. H. Saxton, T. Schalk, R.H. Schindler, B. A. Schumm, S. Sen, V.V. Serbo, M. H. Shaevitz, J. T. Shank, G. Shapiro, D. J. Sherden, K. Shmakov, C. Simopoulos, N.B. Sinev, S.R. Smith, M. Smy, J. A. Snyder, P. Stamer, H. Steiner, R. Steiner, Mg Strauss, D. Su, F. Suekane, A. Sugiyama, S. Suzuki, M. Swartz, A. Szumilo, T. Takahashi, F.E. Taylor, E. Torrence, A. I. Trandafir, J. D. Turk, T. Usher, J. Va’vra, C. Vannini, E. Vella, J. P. Venuti, R Verdier, Piero Giorgio Verdini, S. R. Wagner, AP Waite, G. Watts, A.W. Weidemann, Eric R. Weiss, J. S. Whitaker, S. L. White, F.J. Wickens, D. A. Williams, D.C. Williams, S.H. Williams, S. Willocq, R. J. Wilson, W. J. Wisniewski, M. Woods, G.B. Word, J. Wyss, R. K. Yamamoto, J.M. Yamartino, X. Yang, S. Yellin, C. C. Young, H. Yuta, G. Zapalac, R. W. Zdarko, C. Zeitlin, Jianfeng Zhou,

High-Energy Particle Collisions Research

Average charged multiplicities have been measured separately in b, c and light quark (u, d, s) events from Z0 decays measured in the SLD experiment. Impact parameters of charged tracks were used to select enriched samples of b and light quark events, and reconstructed charmed mesons were used to select c quark events. We measured the charged multiplicities: nuds= 20.21 ± 0.10(stat.) ± 0.22(syst.), nc= 21.28 ± 0.46(stat.)−0.36+0.41syst.) and nb= 23.14 ± 0.10(stat.)−0.37+0.38(syst.), from which we derived the differences between the total average charged multiplicities of c or b quark events and light quark events: Δnc= 1.07 ± 0.47(stat.)−0.30+0.36(syst.) and Δnb= 2.93 ± 0.14(stat.)−0.29+0.30(syst.). We compared these measurements with those at lower center-of-mass energies and with perturbative QCD predictions. These combined results are in agreement with the QCD expectations and disfavor the hypothesis of flavor-independent fragmentation.