Shift in weak phase $\gamma$ due to CP asymmetries in $D$ decays to two pseudoscalar mesons

Abstract

A 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.

15 pages, 3 figures, submitted to Phys. Rev. D. More text and references added

References in corpus (11)

• New Physics and CP Violation in Singly Cabibbo Suppressed D Decays
• Branching ratios and direct CP asymmetries in $D\to PP$ decays
• Measurement of the difference of CP-violating asymmetries in D0 -> K+K- and D0 ->pi+pi- decays at CDF
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• Measurement of CP observables in B+- --> D_CP K+- decays and constraints on the CKM angle gamma
• Search for CP Violation in the Decay $D^{+}\to K_S^0{K}^{+}$
• Search for CP violation in the Decays $D^{\pm }\to K_S^0{K}^{\pm }$, $D_s^{\pm }\to K_S^0{K}^{\pm }$, and $D_s^{\pm }\to K_S^0{\pi }^{\pm }$
• CP violation effects on the measurement of $\gamma$ from $B\to DK$
• Direct CP Violation in D Decays in view of LHCb and CDF Results
• CP violation in beauty decays
• Nonleptonic Charm Decays and CP Violation

Cited by in corpus (4)

• Measurement of the CKM angle $\gamma$ from a combination of LHCb results
• Recent Developments on the CKM Matrix
• Electroweak effects in the extraction of the CKM angle $\gamma$ from $B\to D\pi$ decays
• Asymmetries from the interference between Cabibbo-favored and doubly-Cabibbo-suppressed D decays