Indirect violation of CP, T and CPT in the B d-system

Abstract

The problem of indirect violation of discrete symmeties CP, T and CPT in a neutral meson system can be described using two complex parameters ε and δ, which are invariant under rephasing of meson and quark fields. For the B d system, where the width difference between the physical states is negligible, only Re(δ) and Im(ε) survive. As a consequence, the traditional observables constructed for kaons, which are based on flavour tag, are not useful for the analogous study in this system. We describe how using a CP tag and studying CP-to-flavour transitions of the B mesons, we may build asymmetries, alternative to those used for the kaon, which enable us to test T and CPT invariances of the effective hamiltonian for the B d system.