Search for $C P$ Violation in $D^{\pm}$ Meson Decays to $ϕ π^{\pm}$

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13 February 2012

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 108 (7) , 071801
https://doi.org/10.1103/physrevlett.108.071801

Abstract

We search for

C P

violation in Cabibbo-suppressed charged

D

meson decays by measuring the difference between the

C P

-violating asymmetries for the Cabibbo-suppressed decays

D^{\pm} \to K^{+} K^{-} π^{\pm}

and the Cabibbo-favored decays

D_{s}^{\pm} \to K^{+} K^{-} π^{\pm}

in the

K^{+} K^{-}

mass region of the

ϕ

resonance. Using

955 {fb}^{- 1}

of data collected with the Belle detector, we obtain

A_{C P}^{D^{+} \to ϕ π^{+}} = (+ 0.51 \pm 0.28 \pm 0.05) %

. The measurement improves the sensitivity of previous searches by more than a factor of 5. We find no evidence for direct

C P

violation.

Keywords

CP VIOLATION

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Funding Information

National Aeronautics and Space Administration
U.S. Department of Energy

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