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First observation of B−0→J/ψK+K− and search for B−0→J/ψϕ decays
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LHCb Collaboration (Including: Back, J. J., Craik, Daniel, Dossett, D., Gershon, T. J., Kreps, Michal, Latham, Thomas, Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Wallace, Charlotte, Whitehead, M. (Mark) and Williams, M. P.). (2013) First observation of B−0→J/ψK+K− and search for B−0→J/ψϕ decays. Physical Review D, Volume 88 (Issue 7). Article number 072005. doi:10.1103/PhysRevD.88.072005
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WRAP_LHCb_PhysRevD.88.072005.pdf - Published Version Available under License Creative Commons Attribution. Download (1662Kb) | Preview |
Official URL: http://dx.doi.org/10.1103/PhysRevD.88.072005
Abstract
The first observation of the B−0→J/ψK+K− decay is presented with a data sample corresponding to an integrated luminosity of 1.0 fb−1 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−0→J/ψK+K−)=(2.53±0.31±0.19)×10−6, where the first uncertainty is statistical and the second is systematic. An amplitude analysis of the final state in the B−0→J/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−−0→J/ψa0(980), a0(980)→K+K−)=(4.70±3.31±0.72)×10−7, yielding an upper limit of B(B−0→J/ψa0(980), a0(980)→K+K−)<9.0×10−7 at 90 % confidence level. No evidence of the resonant decay B−0→J/ψϕ is found, and an upper limit on its branching fraction is set to be B(B−0→J/ψϕ)<1.9×10−7 at 90 % confidence level.
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