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.)+0−04136 (syst.) and nb = 23.14 ± 0.10 (stat.)+0−03837 (syst.), from which we derived the differences between the total average charged multiplicities of c or b quark events and light quark events: ∆nc = 1.07 ± 0.47 (stat.)+0−03630 (syst.) and ∆nb = 2.93 ± 0.14 (stat.)+0−03029 (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.

Abe, K., Abe, K., Abt, I., Akagi, T., Allen, N., Ash, W., et al. (1996). Measurement of the charged multiplicities in B, C and light quark events from Z0 decays. PHYSICS LETTERS. SECTION B, 386(1-4), 475-485 [10.1016/0370-2693(96)01025-8].

Measurement of the charged multiplicities in B, C and light quark events from Z0 decays

CARPINELLI, Massimo;
1996

Abstract

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.)+0−04136 (syst.) and nb = 23.14 ± 0.10 (stat.)+0−03837 (syst.), from which we derived the differences between the total average charged multiplicities of c or b quark events and light quark events: ∆nc = 1.07 ± 0.47 (stat.)+0−03630 (syst.) and ∆nb = 2.93 ± 0.14 (stat.)+0−03029 (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.
Articolo in rivista - Articolo scientifico
Physics
English
475
485
11
Abe, K., Abe, K., Abt, I., Akagi, T., Allen, N., Ash, W., et al. (1996). Measurement of the charged multiplicities in B, C and light quark events from Z0 decays. PHYSICS LETTERS. SECTION B, 386(1-4), 475-485 [10.1016/0370-2693(96)01025-8].
Abe, K; Abe, K; Abt, I; Akagi, T; Allen, N; Ash, W; Aston, D; Baird, K; Baltay, C; Band, H; Barakat, M; Baranko, G; Bardon, O; Barklow, T; Bazarko, A; Bendavid, R; Benvenuti, A; Bilei, G; Bisello, D; Blaylock, G; Bogart, J; Bolen, B; Bolton, T; Bower, G; Brau, J; Breidenbach, M; Bugg, W; Burke, D; Burnett, T; Burrows, P; Busza, W; Calcaterra, A; Caldwell, D; Calloway, D; Camanzi, B; Carpinelli, M; Cassell, R; Castaldi, R; Castro, A; Cavallisforza, M; Chou, A; Church, E; Cohn, H; Coller, J; Cook, V; Cotton, R; Cowan, R; Coyne, D; Crawford, G; Doliveira, A; Damerell, C; Daoudi, M; Desangro, R; Dellorso, R; Dervan, P; Dima, M; Dong, D; Du, P; Dubois, R; Eisenstein, B; Elia, R; Etzion, E; Falciai, D; Fan, C; Fero, M; Frey, R; Furuno, K; Gillman, T; Gladding, G; Gonzalez, S; Hallewell, G; Hart, E; Harton, J; Hasan, A; Hasegawa, Y; Hasuko, K; Hedges, S; Hertzbach, S; Hildreth, M; Huber, J; Huffer, M; Hughes, E; Hwang, H; Iwasaki, Y; Jackson, D; Jacques, P; Jaros, J; Johnson, A; Johnson, J; Johnson, R; Junk, T; Kajikawa, R; Kalelkar, M; Kang, H; Karliner, I; Kawahara, H; Kendall, H; Kim, Y; King, M; King, R; Kofler, R; Krishna, N; Kroeger, R; Labs, J; Langston, M; Lath, A; Lauber, J; Leith, D; Lia, V; Liu, M; Liu, X; Loreti, M; Lu, A; Lynch, H; Ma, J; Mancinelli, G; Manly, S; Mantovani, G; Markiewicz, T; Maruyama, T; Masuda, H; Mazzucato, E; Mckemey, A; Meadows, B; Messner, R; Mockett, P; Moffeit, K; Moore, T; Muller, D; Nagamine, T; Narita, S; Nauenberg, U; Neal, H; Nussbaum, M; Ohnishi, Y; Osborne, L; Panvini, R; Park, H; Pavel, T; Peruzzi, I; Piccolo, M; Piemontese, L; Pieroni, E; Pitts, K; Plano, R; Prepost, R; Prescott, C; Punkar, G; Quigley, J; Ratcliff, B; Reeves, T; Reidy, J; Rensing, P; Rochester, L; Rowson, P; Russell, J; Saxton, O; Schalk, T; Schindler, R; Schumm, B; Sen, S; Serbo, V; Shaevitz, M; Shank, J; Shapiro, G; Sherden, D; Shmakov, K; Simopoulos, C; Sinev, N; Smith, S; Smy, M; Snyder, J; Stamer, P; Steiner, H; Steiner, R; Strauss, M; Su, D; Suekane, F; Sugiyama, A; Suzuki, S; Swartz, M; Szumilo, A; Takahashi, T; Taylor, F; Torrence, E; Trandafir, A; Turk, J; Usher, T; Vavra, J; Vannini, C; Vella, E; Venuti, J; Verdier, R; Verdini, P; Wagner, S; Waite, A; Watts, S; Weidemann, A; Weiss, E; Whitaker, J; White, S; Wickens, F; Williams, D; Williams, D; Williams, S; Willocq, S; Wilson, R; Wisniewski, W; Woods, M; Word, G; Wyss, J; Yamamoto, R; Yamartino, J; Yang, X; Yellin, S; Young, C; Yuta, H; Zapalac, G; Zdarko, R; Zeitlin, C; Zhou, J
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