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Measurement of asymmetry in decays
We report the measurements of the -violating parameters in decays observed in collisions, using a data set corresponding to an integrated luminosity of recorded with the LHCb detector. We measure , , , , , where the uncertainties are statistical and systematic, respectively. These parameters are used together with the world-average value of the mixing phase, , to obtain a measurement of the CKM angle from decays, yielding \gamma = (128\,_{-22}^{+17})^\circ modulo , where the uncertainty contains both statistical and systematic contributions. This corresponds to evidence for violation in the interference between decay and decay after mixing.We report the measurements of the CP -violating parameters in B âââD K decays observed in pp collisions, using a data set corresponding to an integrated luminosity of 3.0 fb recorded with the LHCb detector. We measure C = 0.73 ± 0.14 ± 0.05, A â=â0.39â±â0.28â±â0.15, , S = â0.52 ± 0.20 ± 0.07, , where the uncertainties are statistical and systematic, respectively. These parameters are used together with the world-average value of the B mixing phase, â2ÎČ , to obtain a measurement of the CKM angle Îł from B âââD K decays, yielding Îłâ=â(128 )° modulo 180°, where the uncertainty contains both statistical and systematic contributions. This corresponds to 3.8 Ï evidence for CP violation in the interference between decay and decay after mixing