We present a summary of recent results on CP violation and mixing in the charm quark sector based on a high statistics sample collected by photoproduction experiment FOCUS (E831 at Fermilab). We have measured the difference in lifetimes for the D0 decays: D0 --> K-pi+ and D0 --> K-K+ . This translates into a measurement of the y_cp mixing parameter in the D0/D0bar system, under the assumptions that K+K- is an equal mixture of CP odd and CP even eigenstates, and CP violation is negligible in the neutral charm meson system. We verified the latter assumption by searching for a CP violating asymmetry in the Cabibbo suppressed decay modes D+ --> K-K+pi+ , D0 --> K-K+ and D0 --> pi-pi+ . We show preliminary results on a measurement of the branching ratio Gamma(D*+ --> pi+(K+pi-))/Gamma(D*+ --> pi+(K-pi+)).
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Titolo: | New FOCUS results on charm mixing and CP violation | |
Autori: | ||
Data di pubblicazione: | 2000 | |
Rivista: | ||
Abstract: | We present a summary of recent results on CP violation and mixing in the charm quark sector based on a high statistics sample collected by photoproduction experiment FOCUS (E831 at Fermilab). We have measured the difference in lifetimes for the D0 decays: D0 --> K-pi+ and D0 --> K-K+ . This translates into a measurement of the y_cp mixing parameter in the D0/D0bar system, under the assumptions that K+K- is an equal mixture of CP odd and CP even eigenstates, and CP violation is negligible in the neutral charm meson system. We verified the latter assumption by searching for a CP violating asymmetry in the Cabibbo suppressed decay modes D+ --> K-K+pi+ , D0 --> K-K+ and D0 --> pi-pi+ . We show preliminary results on a measurement of the branching ratio Gamma(D*+ --> pi+(K+pi-))/Gamma(D*+ --> pi+(K-pi+)). | |
Handle: | http://hdl.handle.net/11571/460655 | |
Appare nelle tipologie: | 4.1 Contributo in Atti di convegno |