Analyzing leptonic decays of heavy quarkonia in covariant confined quark model

TL;DR

This paper uses a covariant confined quark model to analyze leptonic decays of heavy quarkonia, providing insights into lepton flavor universality and describing experimental data without invoking new physics.

Contribution

It introduces a novel approach for radially excited quarkonia states based on constituent quark mass running and orthogonality, aligning with experimental observations within the Standard Model.

Findings

Successfully describes leptonic decay widths of heavy quarkonia

Supports lepton flavor universality within the Standard Model

Provides a new modeling approach for excited quarkonia states

Abstract

The leptonic decay widths of heavy quarkonia are complementary observables to the semileptonic decays of heavy mesons and provide additional insight into the possible lepton flavor universality breaking. We analyze the former in the framework of the covariant confined quark model, introducing a novel approach for the description of the radially excited quarkonia states, which is based on constituent quark mass running and the orthogonality of the states. We are able to describe the experimental observations by our approach within the Standard model, which does not support new physics explanations.