Study of B -> eta' h

TL;DR

This paper presents precise measurements of branching fractions and CP asymmetries in B meson decays to eta' h, providing insights into charmless hadronic B decays and CP violation with a large data sample.

Contribution

The study provides improved measurements of B -> eta' h decay rates and CP asymmetries using a large data set from the Belle detector, with no evidence of direct CP violation.

Findings

Measured branching fractions for B -> eta' K^0, K^+, pi^+ decays.

Found no significant direct CP violation in charged modes.

Achieved precise results with large data sample.

Abstract

We report improved measurements of exclusive two-body charmless hadronic B meson decays B -> eta' h, where h is a charged kaon or pion or a K^0. These results are obtained from a data sample that contains 386 million B Bbar pairs collected at the Upsilon(4S) resonance, with the Belle detector at the KEKB asymmetric energy e+ e- collider. We measure BF(B^0 ->eta' K^0) = (56.6 ^{+3.6}_{-3.5} +- 3.3) x 10^-6, BF(B^+ -> eta' K^+) = (68.6 +- 2.1 +- 3.6) x 10^-6 and BF(B^+ -> eta' pi^+) = (1.73 ^{+0.69}_{-0.63} +- 0.12) x 10^-6, where the first and second errors are statistic and systematic, respectively. The CP asymmetries in the charged modes are measured and no evidence for direct CP violation is found. We measure ACP(B -> eta' K^+) = 0.03 +- 0.03 +- 0.02 and ACP(B -> eta' pi^+) = 0.15 ^{+0.39}_{-0.38} ^{+0.02}_{-0.06}.