Measurement of indirect CP asymmetries in D 0 → K − K + and D 0 → π − π + decays using semileptonic B decays
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Journal of High Energy Physics（2015）
Cited 37|Views113
Abstract
Time-dependent CP asymmetries in the decay rates of the singly Cabibbo-suppressed decays D 0 → K − K + and D 0 → π − π + are measured in pp collision data corresponding to an integrated luminosity of 3.0 fb −1 collected by the LHCb experiment. The D 0 mesons are produced in semileptonic b -hadron decays, where the charge of the accompanying muon is used to determine the initial state as D 0 or D^0 . The asymmetries in effective lifetimes between D 0 and D^0 decays, which are sensitive to indirect CP violation, are determined to be [ A_(K^-K^+)=(-0.134± 0.077_-0.034^-0.026)%,; A_(π^-π^+) = (-0.092± 0.145_-0.033^-0.025)%, ] where the first uncertainties are statistical and the second systematic. This result is in agreement with previous measurements and with the hypothesis of no indirect CP violation in D 0 decays.
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Key words
CP violation,Charm physics,Lifetime,Hadron-Hadron Scattering
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