Taming new physics in b → cūd(s) with τ(B +)/τ(B d ) and a sl d $$ {a}_{sl}^d $$

Abstract

Abstract Inspired by the recently observed tensions between the experimental data and the theoretical predictions, based on QCD factorisation, for several colour-allowed non-leptonic B-meson decays, we study the potential size of new physics (NP) effects in the decay channels b → cūd(s). Starting from the most general effective Hamiltonian describing the b → cūd(s) transitions, we compute NP contributions to the theoretical predictions of B-meson lifetime and of B-mixing observables. The well-known lifetime ratio τ(B +)/τ(B d ) and the experimental bound on the semi-leptonic CP asymmetry a sl d $$ {a}_{sl}^d $$ , provide strong, complementary constraints on some of the NP Wilson coefficients.

Keywords

• Bottom Quarks
• Specific BSM Phenomenology
• CP Violation