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Abstract |
The first search for the B-s(0\) -> K-pi(+gamma) decay in the range 796 < m(K-pi(+)) < 1800 MeV/c(2) is performed using data from proton-proton collisions collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb(-1). The photons are reconstructed through their conversion into an electron-positron pair, which significantly improves the mass resolution of the reconstructed decays with respect to decays with an unconverted photon. A signal excess with a significance of 3.5 standard deviations is measured, constituting the first experimental evidence for this decay. In the range 796 < m(K-pi(+)) < 996 MeV/c(2), the ratio R between the branching fractions of the signal decay and the favored (B) over bar (0) -> K-pi(+)gamma decay is measured to be R = (3.7 +/- 1.2 +/- 0.4) x 10(-2) where the first uncertainty is statistical and the second is systematic. This measurement is consistent with the value predicted in the Standard Model. In the range 996 < m(K-pi(+)) < 1800 MeV/c(2), the ratio R = (0.2 +/- 2.7 +/- 1.3) x 10(-2) is measured. |
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Address |
[Bonacci, R. B.; Dekkers, S.; Egede, U.; Hadavizadeh, T.; Harris, T. H.; Henderson, R. D. L.; Jelavic, A.; Lane, J. J.; Liu, F. L.; Lobo, I.; Monk, M.; Song, R.; Walton, E. J.] Monash Univ, Sch Phys & Astron, Melbourne, Vic, Australia |
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