An Analysis of B_s Decays in the Left-Right-Symmetric Model with Spontaneous CP Violation

TL;DR

This paper investigates CP violation in B_s decays within the left-right-symmetric model, showing potential for large asymmetries that could be observed in experiments, thus providing a way to detect new physics beyond the Standard Model.

Contribution

It analyzes CP asymmetries in B_s decays under the left-right-symmetric model with spontaneous CP violation, considering current experimental constraints.

Findings

CP asymmetries up to 40% in B_s decays are possible.

The model predicts small CP asymmetry in B_d -> J/psi K_S.

Large asymmetries are accessible at hadron collider experiments.

Abstract

Non-leptonic B_s decays into CP eigenstates that are caused by \bar b -> \bar cc\bar s quark-level transitions, such as B_s -> D_s^+D^-_s, J/psi eta^(') or J/psi phi, 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/psi K_S. Such a pattern would be in favour of B-physics experiments at hadron machines, where the B_s modes are very accessible.