Measurements of the branching fractions and CP asymmetries of B±→J/ψπ± and B±→ψ(2S)π± decays
LHCb Collaboration (Including: Back, J. J., Dossett, D., Gershon, T. J., Harrison, P. F., Kreps, Michal, Latham, Thomas, Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Whitehead, M. (Mark) and Williams, M. P.). (2012) Measurements of the branching fractions and CP asymmetries of B±→J/ψπ± and B±→ψ(2S)π± decays. Physical Review D (Particles, Fields, Gravitation and Cosmology), Volume 85 (Number 9). Article Number 091105(R). ISSN 1550-7998
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Official URL: http://dx.doi.org/10.1103/PhysRevD.85.091105
A study of B ±→J/ψπ ± and B ±→ψ(2S)π ± decays is performed with data corresponding to 0.37fb -1 of proton-proton collisions at √s=7TeV. Their branching fractions are found to be B(B ±→J/ψπ ±)=(3.88±0. 11±0.15)×10 -5andB(B ±→ψ(2S) π ±)=(2.52±0.26±0.15)×10 -5,where the first uncertainty is related to the statistical size of the sample and the second quantifies systematic effects. The measured CP asymmetries in these modes are ACPJ/ψπ=0.005±0.027±0. 011 and ACPψ(2S)π=0.048±0.090±0.011 with no evidence of direct CP violation seen.
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