Doubly heavy systems: decays and OPE

TL;DR

This paper explores the application of the Operator Product Expansion (OPE) to systems with two heavy quarks, analyzing lifetimes of doubly heavy mesons and baryons using current data and discussing previous discrepancies.

Contribution

It provides a detailed analysis of OPE in doubly heavy systems and evaluates baryon lifetimes with updated quark mass constraints, clarifying previous results.

Findings

Calculated lifetimes of doubly charmed baryons.

Constrained quark masses using B-meson lifetime data.

Addressed differences with earlier studies.

Abstract

We discuss questions related to the application of OPE for the long-lived systems with two heavy flavors. The values of quark masses entering such calulations are constrained by use of currently available data on the lifetimes of $B_d$ and $B_c$-mesons. The lifetimes of doubly charmed baryons at these values of parameters are evaluated. The necessary comments on the difference in the results obtained previously are made.