Physics potential of the decays Bs;d -> J/psi eta and Bs -> J/psi phi in the ATLAS experiment at the LHC

TL;DR

This paper discusses the potential to observe CP asymmetry in Bs;d -> J/psi eta and Bs -> J/psi phi decays at ATLAS, which could reveal new physics beyond the Standard Model, emphasizing the simpler analysis for the CP eigenstate decay.

Contribution

It presents methods for studying Bs;d -> J/psi eta and Bs -> J/psi phi decays at ATLAS, highlighting the advantages of the CP eigenstate in CP asymmetry measurement.

Findings

CP asymmetry in these decays is predicted to be very small by the Standard Model.

Observation of a sizeable asymmetry would indicate new physics.

The decay Bs -> J/psi eta allows simpler CP asymmetry analysis.

Abstract

The CP asymmetry predicted by the Standard Model in the decay modes Bs;d -> J/psi eta and Bs -> J/psi phi is very small, and the observation of a sizeable e ect would be a clear indication of new physics beyond the Standard Model. Contrary to the final state J/psi phi, the former final state is a CP eigenstate, and therefore complex angular distribution analyses are not necessary for the asymmetry measurement. In this paper, the approaches for the study of these two decay channels are presented.