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Study of Bº→D*-π+π-π+ and Bº→D*-K+π-π+ decays
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LHCb Collaboration (Including: Back, J. J., Craik, Daniel, 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.). (2013) Study of Bº→D*-π+π-π+ and Bº→D*-K+π-π+ decays. Physical Review D (Particles, Fields, Gravitation and Cosmology), 87 (9). 092001 . doi:10.1103/PhysRevD.87.092001 ISSN 1550-7998.
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WRAP_LCHb_PhysRevD.87.092001.pdf - Published Version Available under License Creative Commons Attribution. Download (482Kb) | Preview |
Official URL: http://dx.doi.org/10.1103/PhysRevD.87.092001
Abstract
Using proton-proton collision data collected by the LHCb experiment at √s=7 TeV, corresponding to an integrated luminosity of 1.0 fb-1, the ratio of branching fractions of the Bº→D*-π+π-π+ decay relative to the Bº→D*-π+ decay is measured to be B(Bº→D*-π+π-π+)/B(Bº→D*-π+)=2.64±0.04(stat)±0.13(syst). The Cabibbo-suppressed decay Bº→D*-K+π-π+ is observed for the first time, and the measured ratio of branching fractions is B(Bº→D*-K+π-π+)/B(Bº→D*-π+π-π+)=(6.47±0.37(stat)±0.35(syst))×10-2. A search for orbital excitations of charm mesons contributing to the Bº→D*-π+π-π+ final state is also performed, and the first observation of the Bº→D- 1(2420)0π+π- decay is reported with the ratio of branching fractions B(B0→(D- 1(2420)0→D*-π+)π-π+)/B(B0→D*-π+π-π+)=(2.04±0.42(stat)±0.22(syst))×10-2, where the numerator represents a product of the branching fractions B(B0→D- 1(2420)0π-π+) and B(D- 1(2420)0→D*-π+).
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