Improved measurement of CP observables in B- --> D0_{CP} K- decays

TL;DR

This paper reports precise measurements of CP asymmetries and branching ratios in B- decays to D0_CP K-, providing data to better determine the CKM phase gamma.

Contribution

It presents new measurements of CP observables in B- -> D0_CP K- decays using a large data sample, improving constraints on the CKM phase gamma.

Findings

Measured direct CP asymmetries A_CP+ and A_CP- with uncertainties.

Determined ratios of branching fractions R_CP+ and R_CP- with uncertainties.

Expressed results in Cartesian coordinates x+ and x- for CKM analysis.

Abstract

We present a study of the decay B- -> D0_CP K- and its charge conjugate, where D0_CP is reconstructed in both a non-CP flavor eigenstate and in CP (CP-even and CP-odd) eigenstates, based on a sample of 382 million Y(4S) -> BBbar decays collected with the BABAR detector at the PEP-II e+e- storage ring. We measure the direct CP asymmetries A_CP\pm and the ratios of the branching fractions R_CP\pm: A_CP+ = 0.27\pm 0.09(stat)\pm 0.04(syst), A_CP- =-0.09\pm 0.09(stat)\pm 0.02(syst), R_CP+ = 1.06\pm 0.10(stat)\pm 0.05(syst), R_CP- = 1.03\pm 0.10(stat)\pm 0.05(syst). We also express the results in terms of the so called Cartesian coordinates x+, x-, and r^2: x+ = -0.09\pm 0.05(stat)\pm 0.02(syst)}, x- = 0.10\pm 0.05(stat)\pm 0.03(syst)}, r^2 = 0.05\pm 0.07(stat)\pm 0.03(syst)}. These results will help to better constrain the phase parameter $\gamma=\arg(-V_{ud}V_{ub}^*/V_{cd}V_{cb}^*)$ of the Cabibbo-Kobayashi-Maskawa quark mixing matrix.