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 CKK=0.14±0.11±0.03 and SKK=0.30±0.12±0.04, where the first uncertainties are statistical and the second systematic. The corresponding quantities are also determined for B0→π+π− decays to be Cππ=−0.38±0.15±0.02 and Sππ=−0.71±0.13±0.02, in good agreement with existing measurements.
First measurement of time-dependent CP violation in $ B_s^0\to {K^{+}}{K^{-}} $ decays
BALDINI, Wander;BOZZI, Concezio;FIORE, Marco;SAVRIE', Mauro;
2013
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 CKK=0.14±0.11±0.03 and SKK=0.30±0.12±0.04, where the first uncertainties are statistical and the second systematic. The corresponding quantities are also determined for B0→π+π− decays to be Cππ=−0.38±0.15±0.02 and Sππ=−0.71±0.13±0.02, in good agreement with existing measurements.File in questo prodotto:
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