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Measurement of the branching fraction of Upsilon(4S)->(BB0)-B-0

Aubert, B; Barate, R; Boutigny, D; Couderc, F; Karyotakis, Y; Lees, JP; Poireau, V; ... Neal, H; + view all (2005) Measurement of the branching fraction of Upsilon(4S)->(BB0)-B-0. PHYS REV LETT , 95 (4) , Article 042001. 10.1103/PhysRevLett.95.042001. Green open access

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Abstract

We report the first measurement of the branching fraction f(00) for Upsilon(4S) -> B-0(B) over bar (0). The data sample consists of 81.7 fb(-1) collected at the Upsilon(4S) resonance with the BABAR detector at the SLAC PEP-II asymmetric-energy e(+)e(-) storage ring. Using partial reconstruction of the decay (B) over bar (0) -> D(*+)l(-)<(nu)over bar >(l) in which only the charged lepton and the soft pion from the decay D*+ -> D(0)pi(+) are reconstructed, we obtain f(00) = 0.487 +/- 0.010(stat) +/- 0.008(syst). Our result does not depend on the branching fractions of (B) over bar (0) -> D(*+)l(-)<(nu)over bar >(l) and D*+ -> D(0)pi(+) decays, on the ratio of the charged and neutral B meson lifetimes, nor on the assumption of isospin symmetry.

Type: Article
Title: Measurement of the branching fraction of Upsilon(4S)->(BB0)-B-0
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.95.042001
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.95.042001
Language: English
Additional information: © 2005 The American Physical Society
Keywords: NEUTRAL B-MESONS
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1303724
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