Thursday, January 24, 2013

1301.5631 (Bhubanjyoti Bhattacharya et al.)

Shift in weak phase $γ$ due to CP asymmetries in $D$ decays to two
pseudoscalar mesons
   [PDF]

Bhubanjyoti Bhattacharya, David London, Michael Gronau, Jonathan L. Rosner
A significant difference of several tenths of a percent has been observed between the direct CP asymmetries of $D^0\to K^+K^-$ and $D^0\to \pi^+\pi^-$. It has been noted recently that CP asymmetries in such singly-Cabibbo-suppressed (SCS) decays can affect the determination of the weak phase $\gamma$ using the Gronau-London-Wyler method of comparing rates for $B^+ \to D K^+$ and $B^- \to D K^-$, where $D$ is a superposition of $D^0$ and $\od$ decaying to a CP eigenstate. Using an analysis of the CP asymmetries in SCS decays based on a $c \to u$ penguin amplitude with standard model weak phase but enhanced by CP-conserving strong interactions, we estimate typical shifts in $\gamma$ of several degrees and pinpoint measurements which would reduce uncertainties to an acceptable level.
View original: http://arxiv.org/abs/1301.5631

No comments:

Post a Comment