D+ -> K-K+pi+ Meson Decays: A Search for CP Violation and a Measurement of the Branching Ratio

TL;DR

This paper reports a preliminary measurement of CP asymmetry and branching ratios in specific D+ meson decays using data from the BABAR detector, aiming to explore CP violation in charm decays.

Contribution

It provides the first preliminary measurements of CP asymmetries in D+ decays to K-K+++ and related channels, reducing systematic uncertainties with normalization.

Findings

CP asymmetry in D+  K+K-+ is (1.4 b1 1.0 b1 1.1) imes 10^{-2}.

Branching ratio of D+  K-K++ relative to D+  K-++ is (10.7 b1 0.1 b1 0.2) imes 10^{-2}.

Results are consistent with no significant CP violation.

Abstract

We present a preliminary measurement of the CP asymmetry in singly Cabibbo-suppressed D+ -> K-K+\pi+ decays and in the resonant decays D+ -> \phi \pi+ and D+ -> K*0 K+. We use a data sample of 79.9 fb^{-1} recorded by the BABAR detector. The Cabibbo-favored Ds+ -> K-K+\pi+ branching fraction is used as normalization in the measurements to reduce systematic uncertainties. Preliminary results of the CP asymmetries obtained are A_{CP}(K+K-\pi \pm) = (1.4 \pm 1.0(stat.) \pm 1.1(syst.))\times 10^{-2}, A_{CP}(\phi\pi \pm) = (0.2 \pm 1.5(stat.) \pm 0.8(syst.))\times 10^{-2}, and A_{CP}(K^{\pm} K*0) = (0.9 \pm 1.7(stat.) \pm 0.8(syst.))\times 10^{-2}. A preliminary determination of the branching ratio is \frac{\Gamma (D+ -> K-K+\pi+)}{\Gamma(D+ -> K-\pi+\pi+)} =(10.7 \pm 0.1(stat.) \pm 0.2(syst.))\times 10^{-2}.