A search for charge-parity (CP) violation in Cabibbo-suppressed D_s^+→K_S^0π^+, D^+→K_S^0K^+, and D^+→ϕπ^+ decays is reported using proton-proton collision data, corresponding to an integrated luminosity of 3.8 fb^-1, collected at a center-of-mass energy of 13 TeV with the LHCb detector. High-yield samples of kinematically and topologically similar Cabibbo-favored D_(s)^+ decays are analyzed to subtract nuisance asymmetries due to production and detection effects, including those induced by CP violation in the neutral kaon system. The results areA_CP(D_s^+→K_S^0π^+)=(1.3±1.9±0.5)×10^-3,A_CP(D^+→K_S^0K^+)=(-0.09±0.65±0.48)×10^-3,A_CP(D^+→ϕπ^+)=(0.05±0.42±0.29)×10^-3,where the first uncertainties are statistical and the second systematic. They are the most precise measurements of these quantities to date, and are consistent with CP symmetry. A combination with previous LHCb measurements, based on data collected at 7 and 8 TeV, is also reported.
Search for CP Violation in D_s^+→K_S^0π^+, D^+→K_S^0K^+, and D^+→ϕπ^+ Decays
Veltri, M;
2019
Abstract
A search for charge-parity (CP) violation in Cabibbo-suppressed D_s^+→K_S^0π^+, D^+→K_S^0K^+, and D^+→ϕπ^+ decays is reported using proton-proton collision data, corresponding to an integrated luminosity of 3.8 fb^-1, collected at a center-of-mass energy of 13 TeV with the LHCb detector. High-yield samples of kinematically and topologically similar Cabibbo-favored D_(s)^+ decays are analyzed to subtract nuisance asymmetries due to production and detection effects, including those induced by CP violation in the neutral kaon system. The results areA_CP(D_s^+→K_S^0π^+)=(1.3±1.9±0.5)×10^-3,A_CP(D^+→K_S^0K^+)=(-0.09±0.65±0.48)×10^-3,A_CP(D^+→ϕπ^+)=(0.05±0.42±0.29)×10^-3,where the first uncertainties are statistical and the second systematic. They are the most precise measurements of these quantities to date, and are consistent with CP symmetry. A combination with previous LHCb measurements, based on data collected at 7 and 8 TeV, is also reported.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
