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Improved measurement of CP observables in B±DCP0K± decays

B. Aubert et al. (BABAR Collaboration)
Phys. Rev. D 77, 111102(R) – Published 26 June 2008

Abstract

We present a study of the decay BD(CP)0K and its charge conjugate, where D(CP)0 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 Υ(4S)BB¯ decays collected with the BABAR detector at the PEP-II e+e storage ring. We measure the direct CP asymmetries ACP± and the ratios of the branching fractions RCP±: ACP+=0.27±0.09(stat)±0.04(syst), ACP=0.09±0.09(stat)±0.02(syst), RCP+=1.06±0.10(stat)±0.05(syst), RCP=1.03±0.10(stat)±0.05(syst). We also express the results in terms of the so-called Cartesian coordinates x+, x, and r2: x+=0.09±0.05(stat)±0.02(syst), x=0.10±0.05(stat)±0.03(syst), r2=0.05±0.07(stat)±0.03(syst). These results will help to better constrain the phase parameter γ=arg(VudVub*/VcdVcb*) of the Cabibbo-Kobayashi-Maskawa quark mixing matrix.

  • Figure
  • Received 28 February 2008

DOI:https://doi.org/10.1103/PhysRevD.77.111102

©2008 American Physical Society

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Vol. 77, Iss. 11 — 1 June 2008

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