Shift in weak phase γ due to CP asymmetries in D decays to two pseudoscalar mesons

الأصل · EN

A difference of several tenths of a percent has been observed between the direct CP asymmetries of D⁰→ K+K- and D⁰→ π+π-. It has been noted recently that CP asymmetries in such singly-Cabibbo-suppressed (SCS) decays can affect the determination of the weak phase γ using the Gronau-London-Wyler method of comparing rates for B+ → D K+ and B- → D K-, where D is a superposition of D⁰ and decaying to a CP eigenstate. Using an analysis of the CP asymmetries in SCS decays based on a c → u penguin amplitude with standard model weak phase but enhanced by CP-conserving strong interactions, we estimate typical shifts in γ of several degrees and pinpoint measurements which would reduce uncertainties to an acceptable level.