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Measurements of cross section and asymmetry fore+e−→bb¯and heavy quark fragmentation at KEK TRISTAN

Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields1994Vol. 49(9), pp. 4339–4347

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

Abstract

Using 773 muons found in hadronic events from 142 ${\mathrm{pb}}^{\ensuremath{-}1}$ of data at a c.m. energy of 57.8 GeV, we extract the cross section and forward-backward charge asymmetry for the ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}b\overline{b}$ process, and the heavy quark fragmentation function parameters for the Peterson model. For the analysis of the ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}b\overline{b}$ process, we use a method in which the behavior of the $c$ quark and lighter quarks is assumed, with only that of the $b$ quark left indeterminate. The cross section and asymmetry for ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}b\overline{b}$ are found to be ${R}_{b} = 0.57 \ifmmode\pm\else\textpm\fi{} 0.06(\mathrm{stat}) \ifmmode\pm\else\textpm\fi{} 0.08(\mathrm{syst})$ and ${A}_{b} = \ensuremath{-}0.59 \ifmmode\pm\else\textpm\fi{} 0.09 \ifmmode\pm\else\textpm\fi{} 0.09$, respectively. They are consistent with the standard model predictions. For the study of the fragmentation function we use the variable $〈{x}_{E}〉$, the fraction of the beam energy carried by the heavy hadrons. We obtain ${〈{x}_{E}〉}_{c}={0.56}_{\ensuremath{-}0.05\ensuremath{-}0.03}^{+0.04+0.03}$ and ${〈{x}_{E}〉}_{b}={0.65}_{\ensuremath{-}0.04\ensuremath{-}0.06}^{+0.06+0.05}$, respectively. These are in good agreement with previously measured values.

Abstract

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