CP Violating Polarization Asymmetry in Charmless Two-Body Decays of Beauty Baryons

TL;DR

This paper explores CP violation in charmless two-body decays of b-baryons, proposing new polarization-based observables and relations that can test the Standard Model and flavor symmetry with future LHCb data.

Contribution

It introduces new CP violating observables related to baryon polarization and derives relations among decay amplitudes in the flavor SU(3) limit, offering novel tests for CP violation mechanisms.

Findings

New polarization-related CP violation observables

Relations among decay amplitudes in SU(3) limit

Potential for experimental tests at LHCb

Abstract

Several baryons containing a heavy b-quark, the b-baryons, have been discovered. The charmless two-body decays of b-baryons can provide a new platform for CP violating studies in a similar way as charmless two-body decays of B-meson. In b-baryon decays there are new CP violating observable related to baryon polarization. We show that in the flavor $SU(3)$ limit there exist relations involve different combinations of the decay amplitudes compared with those in CP violating rate asymmetry. These new relations therefore provide interesting tests for the mechanism of CP in the standard model (SM) and flavor $SU(3)$ symmetry. Future data from LHCb can test these relations.