Doubly heavy baryons in sum rules of NRQCD

TL;DR

This paper uses NRQCD sum rules to calculate the masses and couplings of doubly heavy baryons, incorporating Coulomb-like corrections and nonperturbative condensate effects to improve estimate accuracy.

Contribution

It introduces a comprehensive analysis of doubly heavy baryons using NRQCD sum rules, including Coulomb corrections and nonperturbative effects, enhancing previous estimation methods.

Findings

Coulomb-like corrections significantly affect baryon mass calculations.

Nonperturbative condensates improve the convergence and accuracy of sum rule estimates.

Factorization breaks down due to higher condensates, impacting theoretical predictions.

Abstract

The masses of baryons containing two heavy quarks and their couplings to the corresponding quark currents are evaluated in the framework of NRQCD sum rules. The coulomb-like corrections in the system of doubly heavy diquark are taken into account, and the contribution of nonperturbative terms coming from the quark, gluon and mixed condensates as well as the product of quark and gluon condensates, is analyzed. The higher condensates destroy the factorization of baryon and diquark correlators and provide the convergency of sum rule method. As a result the accuracy of estimates is improved.