Study of the sensitivity to CKM angle $\gamma$ under simultaneous determination from multiple $B$ meson decay modes

TL;DR

This paper proposes a strategy for simultaneously measuring the CKM angle gamma from multiple B meson decay modes, accounting for correlations, which improves measurement precision and statistical robustness.

Contribution

It introduces a novel simultaneous analysis method for multiple B decay modes to determine gamma, enhancing accuracy over separate measurements.

Findings

Simultaneous analysis reduces uncertainties in gamma measurement.

Correlation-aware approach improves statistical stability.

Method outperforms standalone decay mode analyses.

Abstract

Several methods exist to measure $CP$ violation observables related to the CKM unitarity triangle angle $\gamma$ using $B$ meson decays. These observables are different for every $B$ meson decay considered, although the information they contain on $\gamma$ is encoded in a similar way for all of them. This paper describes a strategy for a simultaneous measurement of $\gamma$ using several $B$ meson decays that takes into account possible correlations between them. Sensitivity studies demonstrate that the simultaneous analysis of several $B$ meson decay modes results in smaller uncertainties and improved statistical behaviour compared to a combination of standalone measurements.