Time-dependent CP asymmetries in D and B decays

TL;DR

This paper discusses methods to measure time-dependent CP asymmetries in D and B meson decays, which can reveal new physics and test the Standard Model's flavor structure, with implications for current and future experiments.

Contribution

It proposes a new method for measuring time-dependent CP asymmetries in charm decays and assesses their potential to uncover physics beyond the Standard Model.

Findings

Time-dependent CP asymmetries in D decays can indicate new physics.

Current bounds on DeltaGamma(B_d) affect measurements of the CKM angle beta.

The proposed method can be applied at existing and future experiments.

Abstract

The measurement of time-dependent CP asymmetries in charm decays can provide a unique insight into the flavor changing structure of the Standard Model. We examine a number of different CP eigenstate decays of D mesons and describe a method that can be used to measure time-dependent CP asymmetries at existing and future experiments, with a preliminary assessment, based on statistical considerations, of their various capabilities. Any asymmetry observed in time-dependent analysis of neutral D mesons could signify new physics. We discuss the measurements required to perform direct and indirect tests of the charm unitarity triangle and the relationship between this and the B_d unitarity triangle. We also highlight that current experimental bounds on DeltaGamma(B_d) translate into a significant systematic uncertainty on the measurement of beta from b to c c-bar s decays.