An analysis of Bs decays in the left-right-symmetric model with spontaneous CP violation

Abstract

Non-leptonic B s decays into CP eigenstates that are caused by b ̄ → c ̄ c s ̄ quark-level transitions, such as B s → D s + D − s , J/ψ η (′) or J/ψ φ , provide a powerful tool to search for “new physics”, as the CP-violating effects in these modes are tiny in the Standard Model. We explore these effects for a particular scenario of new physics, the left-right-symmetric model with spontaneous CP violation. In our analysis, we take into account all presently available experimental constraints on the parameters of this model, i.e. those implied by K- and B-decay observables; we find that CP asymmetries as large as O(40%) may arise in the B s channels, whereas the left-right-symmetric model favours a small CP asymmetry in the “gold-plated” mode B d→J/ψ K S . Such a pattern would be in favour of B-physics experiments at hadron machines, where the B s modes are very accessible.