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) Measurement of the ratio of branching fractions β(Bº → K*ºγ)/β(Bºs → φγ) and the direct CP asymmetry in Bº → K*ºγ. Nuclear Physics B, 867 (1). pp. 1-18. doi:10.1016/j.nuclphysb.2012.09.013 ISSN 0550-3213.
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Abstract
The ratio of branching fractions of the radiative B decays Bº → K*ºγ and Bºs → φγ has been measured using an integrated luminosity of 1.0 fb(-1) of pp collision data collected by the LHCb experiment at a centre-of-mass energy of √s = 7 TeV. The value obtained is
β(Bº → K*ºγ)/β(Bºs → φγ) = 1.23 ± 0.06 (stat.) ± 0.04 (syst.) ± 0.10 (fs/fd),
where the first uncertainty is statistical, the second is the experimental systematic uncertainty and the third is associated with the ratio of fragmentation fractions fs/fd. Using the world average value for β(Bº → K*ºγ), the branching fraction β(Bºs → φγ) is measured to be (3.5 ± 0.4) x 10(-5). The direct CP asymmetry in Bº → K*ºγ decays has also been measured with the same data and found to be
ACP(Bº → K*ºγ) = (0.8 ± 1.7 (stat.) ± 0.9 (syst.))%.
Both measurements are the most precise to date and are in agreement with the previous experimental results and theoretical expectations.
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