Measurements of cross section and asymmetry for [ital e][sup +][ital e][sup [minus]][r arrow][ital b[bar b]] and heavy quark fragmentation at KEK TRISTAN

Journal Article · Sun May 01 00:00:00 EDT 1994 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.49.4339· OSTI ID:5074064

Liu, F; Chinitz, L M; Abe, K; Breedon, R E; Fujii, Y; Kurihara, Y; Maki, A; Nozaki, T; Omori, T; Sagawa, H; Sakai, Y; Sasaki, T; Sugimoto, Y; Takaiwa, Y; Terada, S; Kirk, P; Cheng, C P; Gao, W X; Yan, W G; Ye, M H ; Abashian, A; Gotow, K; Mattson, M E; Piilonen, L; Sterner, K L; Lusin, S; Rosenfeld, C; Wilson, S; Zheng, L Y; Fry, C A; Tanaka, R; Ko, W; Lander, R L; Rowe, J; Smith, J R; Stuart, D; Kanda, S; Olsen, S L; Ueno, K; Kajino, F; Poling, R; Thomas, T; Aso, T; Miyano, K; Miyata, H; Okubo, K; Oyoshi, M; Shirai, M; Yamashita, Y; Lee, M H; Sannes, F; Schnetzer, S; Stone, R; Vinson, J; Bodek, A; Kim, B J; Kumita, T; Li, Y K; Velisarris, C; Walker, R C; Kobayashi, S; Murakami, A; Sahu, S K; Zomorrodian, M E; Chung, Y S; Cho, D K; Kang, J S; Kim, D Y; Lee, K B; Park, K W; Kim, S K; Myung, S S; Choi, S K; Son, D; Ebara, S; Matsumoto, S; Takashimizu, N; Ishizuka, T ^[1]

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1. KEK, National Laboratory for High Energy Phys

Using 773 muons found in hadronic events from 142 pb[sup [minus]1] of data at a c.m. energy of 57.8 GeV, we extract the cross section and forward-backward charge asymmetry for the [ital e][sup +][ital e][sup [minus]][r arrow][ital b[bar b]] process, and the heavy quark fragmentation function parameters for the Peterson model. For the analysis of the [ital e][sup +][ital e][sup [minus]][r arrow][ital b[bar b]] process, we use a method in which the behavior of the [ital c] quark and lighter quarks is assumed, with only that the [ital b] quark left indeterminate. The cross section and asymmetry for [ital e][sup +][ital e][sup [minus]][r arrow][ital b[bar b]] are found to be [ital R][sub [ital b]]=0.57[plus minus]0.06(stat)[plus minus]0.08(syst) and [ital A][sub [ital b]]=[minus]0.59[plus minus]0.09[plus minus]0.09, respectively. They are consistent with the standard model predictions. For the study of the fragmentation function we use the variable [l angle][ital x][sub [ital E]][r angle], the fraction of the beam energy carried by the heavy hadrons. We obtain [l angle][ital x][sub [ital E]][r angle][sub [ital c]]= 0.56[sub [minus]0.05[minus]0.03][sup +0.04+0.03] and [l angle][ital x][sub [ital E]][r angle][sub [ital b]]= 0.65[sub [minus]0.04[minus]0.06][sup +0.06+0.05], respectively. These are in good agreement with previously measured values.

• OSTI ID: 5074064
• Journal Information: Physical Review, D (Particles Fields); (United States), Vol. 49:9; ISSN 0556-2821
• Country of Publication: United States
• Language: English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
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ASYMMETRY
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FRAGMENTATION
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ELEMENTARY PARTICLES
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