Measurement of Υ(5S) decays to B0 and B+ mesons

A. Drutskoy et al. (Belle Collaboration)
Phys. Rev. D 81, 112003 – Published 22 June 2010

Abstract

Decays of the Υ(5S) resonance to channels with B+ and B0 mesons are studied using a 23.6fb1 data sample collected with the Belle detector at the KEKB asymmetric-energy e+e collider. Fully reconstructed B+J/ψK+, B0J/ψK*0, B+D¯0π+, and B0Dπ+ decays are used to obtain the charged and neutral B production rates per bb¯ event, f(B+)=(72.13.8+3.9±5.0)% and f(B0)=(77.05.6+5.8±6.1)%. Assuming equal rates to B+ and B0 mesons in all channels produced at the Υ(5S) energy, we measure the fractions for transitions to two-body and three-body channels with B meson pairs, f(BB¯)=(5.50.9+1.0±0.4)%, f(BB¯*+B*B¯)=(13.7±1.3±1.1)%, f(B*B¯*)=(37.51.9+2.1±3.0)%, f(BB¯π)=(0.0±1.2±0.3)%, f(BB¯*π+B*B¯π)=(7.32.1+2.3±0.8)%, and f(B*B¯*π)=(1.01.3+1.4±0.4)%. The latter three fractions are obtained assuming isospin conservation.

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  • Received 6 April 2010

DOI:https://doi.org/10.1103/PhysRevD.81.112003

©2010 American Physical Society

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Vol. 81, Iss. 11 — 1 June 2010

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