Study of the structure ofe+e−→bb¯gevents and first limits on the anomalous chromomagnetic coupling of thebquark
Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields1999Vol. 60(9)
Kenji Abe, Koya Abe, K. Abe, И. Адам, H. Akimoto, T. Akagi, N. J. Allen, W. W. Ash, D. Aston, K. Baird, C. Baltay, H. R. Band, M. Barakat, O. Bardon, T. L. Barklow, G. L. Bashindzhagyan, J. M. Bauer, G. Bellodi, R. Ben-David, A. C. Benvenuti, Gian Mario Bilei, D. Bisello, G. Blaylock, J. R. Bogart, G. R. Bower, J. Brau, M. Breidenbach, W. Bugg, D. L. Burke, T. H. Burnett, P.N. Burrows, A. Calcattera, D. Calloway, B. Camanzi, M. Carpinelli, R. Cassell, R. Castaldi, Abigail Rodrigues Castro, F. Šforza, A. Chou, E. Church, H.O. Cohn, J. A. Coller, M. R. Convery, V. Cook, R. Cotton, R. F. Cowan, D. G. Coyne, G. Crawford, C. Damerell, M.N. Danielson, M. Daoudi, N. De Groot, R. Dell’Orso, P. Dervan, R. de Sangro, Marco Dima, A. D’Oliveira, D. Dong, M. Doser, R. Dubois, B. I. Eisenstein, V. Eschenburg, E. Etzion, S. Fahey, D. Falciai, C. Fan, J. P. Fernandez, M. J. Fero, K. T. Flood, R. Frey, J. Gifford, T. Gillman, G. Gladding, S. González, E.R. Goodman, E. L. Hart, J. L. Harton, A. Hasan, K. Hasuko, S. Hedges, S. S. Hertzbach, M. D. Hildreth, Jürgen Huber, M.E. Huffer, E. W. Hughes, X. Huynh, H. Hwang, M. Iwasaki, D. J. Jackson, P. Jacques, J. A. Jaros, Zihao Jiang, A. S. Johnson, J. R. Johnson, R. A. Johnson, T. R. Junk, R. Kajikawa, M. Kalelkar, Yu. Kamyshkov, H. J. Kang, I. Karliner, H. Kawahara, Y. D. Kim, M. King, R. S. B. King, R. Kofler, N. M. Krishna, R. Kroeger, M. Langston, A. Lath, D. W. G. S. Leith, V. Lia, C. Lin, M. X. Liu, X. Liu, M. Loreti, A. Lu, H. L. Lynch, Jun Ma, G. Mancinelli, S. Manly, G. Mantovani, T. W. Markiewicz, T. Maruyama, H. Masuda, E. Mazzucato, A. K. McKemey, B. T. Meadows, G. Menegatti, R. Messner, P. Mockett, K. C. Moffeit, T. B. Moore, M. Morii, D. Murray, V. Murzin, T. Nagamine, S. Narita, U. Nauenberg, H. A. Neal, M. Nussbaum, N. Oishi, D. Onoprienko, L. S. Osborne, R. S. Panvini, C. H. Park, T. J. Pavel, I. Peruzzi, M. Piccolo, L. Piemontese, K. Pitts, R. J. Plano, R. Prepost, C. Y. Prescott, G. D. Punkar, J. Quigley, B. N. Ratcliff, T. W. Reeves, J. Reidy, P. L. Reinertsen, P. Rensing, L.S. Rochester, P.C. Rowson, J. J. Russell, O. H. Saxton, T. Schalk, R. H. Schindler, B. A. Schumm, J. Schwiening, Sanjib 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, H. Staengle, A. Stahl, P. Stamer, H. Steiner, R. Steiner, M. G. Strauss, D. Su, F. Suekane, A. Sugiyama, S. Suzuki, M. Swartz, A. Szumilo, Tohru Takahashi, F. Taylor, J. Thom, E. Torrence, Nicolaos Toumbas, T. Usher, C. Vannini, J. Va’vra, E. Vella, J. P. Venuti, R. Verdier, P. G. Verdini, D.L. Wagner, S. R. Wagner, A. P. Waite, S. Walston, J. Wang, G. Watts, A. W. Weidemann, E. R. Weiss, J. S. Whitaker, S. L. White, F. J. Wickens, B. Williams, D. C. Williams, Sean James Williams, S. Willocq, R. J. Wilson, W. J. Wisniewski, J. L. Wittlin, M. Woods, G. B. Word, T. Wright, J. Wyss, R. K. Yamamoto, J.M. Yamartino, Ximeng Yang, J. Yashima, S. Yellin, C. C. Young, H. Yuta, G. Zapalac, R. W. Zdarko, Jianfeng Zhou
Abstract
The structure of ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}b\overline{b}g$ events was studied using ${Z}^{0}$ decays recorded in the SLC Large Detector experiment at SLAC. Three-jet final states were selected and the charge-coupled device-based vertex detector was used to identify two of the jets as b or $\overline{b}.$ Distributions of the gluon energy and polar angle were measured over the full kinematic range for the first time, and compared with perturbative QCD predictions. The energy distribution is potentially sensitive to an anomalous b chromomagnetic moment \ensuremath{\kappa}. We measured \ensuremath{\kappa} to be consistent with zero and set the first limits on its value: $\ensuremath{-}0.17<\ensuremath{\kappa}<0.11$ at 95% C.L.
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