1999
article
Study of the structure of e{sup +}e{sup {minus}}{r_arrow}b{bar b}g events and first limits on the anomalous chromomagnetic coupling of the {ital b} quark
R. Steiner, H. Yuta, A. C. Benvenuti, N. De Groot, N. J. Allen, Ronald James Cotton, P. Dervan, Abdulqader Ali Hasan, A. K. McKemey, Gordon Watts, J. A. Coller, Samuel Hedges, J. T. Shank, J. S. Whitaker, A. D’Oliveira, ROBERT ALAN JOHNSON, James Vincent Mead, M. Nussbaum, M.N. Danielson, S. Fahey, C. Fan, E.R. Goodman, N. Murali Krishna, U. Nauenberg, D.L. Wagner, Bianca C. Williams, Peter C Rowson, M.H. Shaevitz, Marco Dima, J. L. Harton, M. B. SMY, H. Staengle, R. J. Wilson, B. Camanzi, Edoardo Mazzucato, Giuliana Menegatti, L. Piemontese, A. Calcattera, Riccardo de Sangro, D. Falciai, I. Peruzzi, Marcello Piccolo, Bob I. Eisenstein, Gary E. Gladding, I. Karliner, Morris L. Swartz, G. Shapiro, H. Steiner, M. Barakat, K. Baird, G. Blaylock, K. T. Flood, S. S. Hertzbach, R. R. Kofler, C.-J. Lin, Michael G. Strauss, S. Willocq, J. L. Wittlin, J. M. Bauer, V. Eschenburg, Richard Kroeger
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Le résumé fourni par la source
The structure of e{sup +}e{sup {minus}}{r_arrow}b{bar b}g events was studied using Z{sup 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 {ital b} or {bar 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 {ital b} chromomagnetic moment {kappa}. We measured {kappa} to be consistent with zero and set the first limits on its value: {minus}0.17{lt}{kappa}{lt}0.11 at 95{percent} C.L. {copyright} {ital 1999} {ital The American Physical Society}
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Les sujets associés
Particle physics theoretical and experimental studiesQuantum Chromodynamics and Particle InteractionsHigh-Energy Particle Collisions Research