First measurement of the double-inclusive B/B̄ hadron energy distribution in e+e- annihilations, and of angle-dependent moments of the B and B̄ energies

First measurement of the double-inclusive B/B̄ hadron energy distribution in e+e- annihilations, and of angle-dependent moments of the B and B̄ energies

We have made the first measurement of the double-inclusive B/B̄ 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 t...

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Bibliographic Details
Main Authors: Koya, A, Kenji, A, Abe, T, Adam, I, Akimoto, H, Aston, D, Baird, K, Baltay, C, Band, H, Barklow, T, Bauer, J, Bellodi, G, Berger, R, Blaylock, G, Bogart, JR, Bower, G, Brau, J, Breidenbach, M, Bugg, WM, Burke, D, Burnett, T, Burrows, P, Calcaterra, A, Cassell, R, Chou, A
Format: Journal article
Language:English
Published: 2004
Description
Summary:We have made the first measurement of the double-inclusive B/B̄ 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/B̄-decay vertices with high efficiency and purity, and to provide precise measurements of the kinematic quantities used to calculate the B energies in this novel technique. We measured the B/B̄ energies with good efficiency and resolution over the full kinematic range. We measured moments of the scaled energies of the B and B̄ 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. © 2003 Elsevier B.V. All rights reserved.

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