Heavy quark symmetry constraints on semileptonic form factors and decay widths of doubly heavy baryons

TL;DR

This paper discusses how heavy quark symmetry can be used to evaluate and compare different quark model predictions for the semileptonic decay widths of doubly heavy baryons, highlighting violations of symmetry constraints.

Contribution

It introduces a method to test quark model calculations against heavy quark symmetry constraints for doubly heavy baryon decays.

Findings

Some quark models violate heavy quark spin symmetry constraints.

Discrepancies in decay width predictions are explained by symmetry violations.

Heavy quark symmetry provides a benchmark for model validation.

Abstract

We show how heavy quark symmetry constraints on doubly heavy baryon semileptonic decay widths can be used to test the validity of different quark model calculations. The large discrepancies in the results observed between different quark model approaches can be understood in terms of a severe violation of heavy quark spin symmetry constraints by some of those models.