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First measurement of time-dependent CP violation in B0s→K+K− 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 measurement of time-dependent CP violation in B0s→K+K− decays. Journal of High Energy Physics, Volume 2013 (Number 10). Article number 183. doi:10.1007/JHEP10(2013)183
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WRAP_LHCb_art%3A10.1007%2FJHEP10%282013%29183.pdf - Published Version Available under License Creative Commons Attribution. Download (2828Kb) | Preview |
Official URL: http://dx.doi.org/10.1007/JHEP10(2013)183
Abstract
Direct and mixing-induced CP-violating asymmetries in B0s→K+K− decays are measured for the first time using a data sample of pp collisions, corresponding to an integrated luminosity of 1.0 fb−1, collected with the LHCb detector at a centre-of-mass energy of 7 TeV. The results are C KK = 0.14 ± 0.11 ± 0.03 and S KK = 0.30 ± 0.12 ± 0.04, where the first uncertainties are statistical and the second systematic. The corresponding quantities are also determined for B 0 → π + π − decays to be C ππ = −0.38 ± 0.15 ± 0.02 and S ππ = −0.71 ± 0.13 ± 0.02, in good agreement with existing measurements.
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