We present a measurement of D0-Dbar0 mixing and CP violation using the ratio of lifetimes simultaneously extracted from a sample of D0 mesons produced through the flavor-tagged process D*+→D0π+, where D0 decays to K∓π±, K−K+, or π−π+, along with the untagged decays D0→K∓π± and D0→K−K+. The lifetimes of the CP-even, Cabibbo-suppressed modes K−K+ and π−π+ are compared to that of the CP-mixed mode K∓π± in order to measure yCP and ΔY. We obtain yCP=[0.72±0.18(stat)±0.12(syst)]% and ΔY=[0.09±0.26(stat)±0.06(syst)]%, where ΔY constrains possible CP violation. The yCP result excludes the null mixing hypothesis at 3.3σ significance. This analysis is based on an integrated luminosity of 468 fb−1 collected with the BABAR detector at the PEP-II asymmetric-energy e+e− collider.
Measurement of D^{0}-D[over ?]^{0} mixing and CP violation in two-body D^{0} decays
CONTRI, ROBERTO;GUIDO, ELISA;LO VETERE, MAURIZIO;MONGE, MARIA ROBERTA;
2013-01-01
Abstract
We present a measurement of D0-Dbar0 mixing and CP violation using the ratio of lifetimes simultaneously extracted from a sample of D0 mesons produced through the flavor-tagged process D*+→D0π+, where D0 decays to K∓π±, K−K+, or π−π+, along with the untagged decays D0→K∓π± and D0→K−K+. The lifetimes of the CP-even, Cabibbo-suppressed modes K−K+ and π−π+ are compared to that of the CP-mixed mode K∓π± in order to measure yCP and ΔY. We obtain yCP=[0.72±0.18(stat)±0.12(syst)]% and ΔY=[0.09±0.26(stat)±0.06(syst)]%, where ΔY constrains possible CP violation. The yCP result excludes the null mixing hypothesis at 3.3σ significance. This analysis is based on an integrated luminosity of 468 fb−1 collected with the BABAR detector at the PEP-II asymmetric-energy e+e− collider.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.