Direct CP Violation Searches in Charmless Hadronic B Meson Decays

TL;DR

This paper reports on a search for direct CP violation in charmless hadronic B meson decays using data from the BABAR detector, measuring charge asymmetries in various decay channels with results consistent with no CP violation.

Contribution

First measurement of direct CP violation asymmetries in multiple charmless hadronic B decay modes using a large data sample from BABAR.

Findings

Charge asymmetries measured are consistent with zero within uncertainties.

No significant evidence of direct CP violation observed in the studied decays.

Results help constrain theoretical models of CP violation in B decays.

Abstract

We search for direct CP violation in charmless hadronic B decays observed in a sample of about 22.7 million $B\bar{B}$ pairs collected with the BABAR detector at the PEP-II asymmetric-energy $e^+e^-$ collider. We measure the following charge asymmetries: ${\cal A}_{CP} (B^{\pm}\to\eta^\prime K^{\pm}) = -0.11\pm 0.11\pm 0.02$, ${\cal A}_{CP} (B^{\pm}\to\omega \pi^{\pm}) = -0.01^{+0.29}_{-0.31}\pm 0.03$, ${\cal A}_{CP} (B^{\pm}\to\phi K^{\pm}) = -0.05\pm 0.20\pm 0.03$, ${\cal A}_{CP} (B^{\pm}\to\phi K^{*\pm}) = -0.43^{+0.36}_{-0.30}\pm 0.06$, and ${\cal A}_{CP} (B^{0}\to\phi K^{*0}) = 0.00\pm 0.27\pm 0.03$.