1. First measurement of the double-inclusive B/B hadron energy distribution in e+e− annihilations, and of angle-dependent moments of the B and B energies
- Author
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J. L. Wittlin, I. Adam, K. T. Flood, S. Walston, K. G. Baird, J. Va'vra, H. Akimoto, L.S. Rochester, H. Yuta, J. M. Bauer, O. H. Saxton, A. W. Weidemann, T. L. Usher, J.J. Reidy, J. Schwiening, F. E. Taylor, C. H. Park, Bruce Schumm, H. R. Band, J. P. Fernandez, R. R. Kofler, M.E. Huffer, J. R. Bogart, V. Lia, D. L. Burke, M. R. Convery, I. Erofeeva, S. Manly, R. Berger, W. M. Bugg, N. B. Sinev, A. P. Waite, M. Morii, J. A. Jaros, G. Bellodi, G. Nesom, A. Suzuki, G. R. Bower, S. Willocq, R. Dubois, N. De Groot, G. Blaylock, H. M. Steiner, Gilbert Shapiro, H. Staengle, S. S. Hertzbach, T. Schalk, R. Messner, T. Maruyama, R. Verdier, P. N. Burrows, C. Y. Prescott, E. L. Hart, C.S. Lin, M. Kalelkar, K. Hasuko, E. R. Weiss, V. Eschenburg, D. Su, G. Mancinelli, P. C. Rowson, G. Crawford, I. M. Peruzzi, H. J. Kang, D. Aston, V.V. Serbo, D. J. Jackson, R. E. Cassell, E. Etzion, W. J. Wisniewski, M. Piccolo, S. Narita, F. Suekane, X. Huynh, T. H. Burnett, S. J. Yellin, J. J. Russell, Achim Stahl, D.L. Wagner, Dominik Müller, R. Cowan, R. Frey, L.S. Osborne, Kenji Abe, U. Nauenberg, Giancarlo Mantovani, S. Fahey, J. S. Whitaker, N. Oishi, T. Abe, M. Doser, E. Torrence, J. R. Johnson, R. Kajikawa, M. Iwasaki, C. Baltay, D. N. Dong, C.J.S. Damerell, R. J. Wilson, P.L. Reinertsen, J. A. Snyder, D. Onoprienko, R. Prepost, Martin Breidenbach, P.F. Jacques, Zihao Jiang, M. Daoudi, A. Sugiyama, V. Murzin, A. Chou, M. Woods, A. K. McKemey, K.C. Moffeit, D. W. G. S. Leith, L. Piemontese, H. O. Cohn, R.J. Plano, T. B. Moore, Thomas W. Markiewicz, B. N. Ratcliff, P. E. Stamer, C. C. Young, Koya Abe, J. Yashima, R. Kroeger, J. E. Brau, M. Langston, S. H. Williams, Timothy Barklow, A. Calcaterra, A. S. Johnson, T. R. Wright, H. A. Neal, R. K. Yamamoto, R. S. Panvini, D. Falciai, J. Thom, J. A. Coller, Melody A. Swartz, V. Cook, and R. de Sangro
- Subjects
Quantum chromodynamics ,Physics ,Nuclear and High Energy Physics ,Particle physics ,Physics::Instrumentation and Detectors ,Electron–positron annihilation ,High Energy Physics::Phenomenology ,Hadron ,FOS: Physical sciences ,Order (ring theory) ,Perturbative QCD ,High Energy Physics - Experiment ,Nuclear physics ,High Energy Physics - Experiment (hep-ex) ,Production (computer science) ,High Energy Physics::Experiment ,Ansatz ,Bar (unit) - Abstract
We have made the first measurement of the double-inclusive B/Bbar energy distribution in e+e- annihilations, using a sample of 400,000 hadronic Z0 decay events recorded in the SLD experiment at SLAC between 1996 and 1998. The small and stable SLC beam spot and the CCD-based vertex detector were used to reconstruct B/Bbar decay vertices with high efficiency and purity, and to provide measurements of the kinematic quantities used to calculate the B energies in this novel technique. We measured the B/Bbar energies with good efficiency and resolution over the full kinematic range. We measured moments of the scaled energies of the B and Bbar hadrons vs. the opening angle between them. By comparing these results with perturbative QCD predictions we tested the ansatz of factorisation in heavy-quark production. A recent next-to-leading order calculation reproduces the data., Comment: 17 pages, 6 figures; submitted to Physics Letters B
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