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- W2949202511 abstract "The LHCb experiment recorded data corresponding to an integrated luminosity of 3.0 $fb^{-1}$ during its first run of data taking. These data yield the largest samples of charmed hadrons in the world and are used to search for CP violation in the $D^0$ system. Among the many measurements performed at LHCb, a measurement of the direct CP asymmetry in $D^0 rightarrow K_S^0 K_S^0$ decays is presented and is found to be $A_{CP}(D^0 rightarrow K_S^0 K_S^0) = (-2.9 pm 5.2 pm 2.2), %, $ where the first uncertainty is statistical and the second systematic. This represents a significant improvement in precision over the previous measurement of this parameter. Measurements of the parameter $A^Gamma$, defined as the CP asymmetry of the $D^0$ effective lifetime when decaying to a CP eigenstate, are also presented. Using semi-leptonic b-hadron decays to tag the flavour of the $D^0$ meson at production with the $K^+K^-$ and $pi^+pi^-$ final states yields $A^Gamma(K^+K^-) = (-0.134 pm 0.077^{+0.026}_{-0.034}), %,$ $A^Gamma(pi^+pi^-) = (-0.092 pm 0.145^{+0.025}_{-0.033}), %. $ Thus no evidence of direct or indirect CP violation in the $D^0$ system is found, though it is tightly constrained." @default.
- W2949202511 created "2019-06-27" @default.
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- W2949202511 date "2015-11-11" @default.
- W2949202511 modified "2023-09-27" @default.
- W2949202511 title "Searches for CP violation in two-body charm decays" @default.
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