• Open Access

First observation of B¯0J/ψK+K and search for B¯0J/ψϕ decays

R. Aaij et al. (LHCb Collaboration)
Phys. Rev. D 88, 072005 – Published 14 October 2013

Abstract

The first observation of the B¯0J/ψK+K decay is presented with a data sample corresponding to an integrated luminosity of 1.0fb1 of pp collisions at a center-of-mass energy of 7 TeV collected with the LHCb detector. The branching fraction is measured to be B(B¯0J/ψK+K)=(2.53±0.31±0.19)×106, where the first uncertainty is statistical and the second is systematic. An amplitude analysis of the final state in the B¯0J/ψK+K decay is performed to separate resonant and nonresonant contributions in the K+K spectrum. Evidence of the a0(980) resonance is reported with statistical significance of 3.9 standard deviations. The corresponding product branching fraction is measured to be B(B¯0J/ψa0(980),a0(980)K+K)=(4.70±3.31±0.72)×107, yielding an upper limit of B(B¯0J/ψa0(980),a0(980)K+K)<9.0×107 at 90% confidence level. No evidence of the resonant decay B¯0J/ψϕ is found, and an upper limit on its branching fraction is set to be B(B¯0J/ψϕ)<1.9×107 at 90% confidence level.

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  • Received 27 August 2013

DOI:https://doi.org/10.1103/PhysRevD.88.072005

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

© 2013 CERN, for the LHCb collaboration

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Vol. 88, Iss. 7 — 1 October 2013

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