Long-distant contribution and $\chi_{c1}$ radiative decays to light vector meson

TL;DR

This paper investigates the radiative decay of $ ext{chi}_{c1}$ to light vector mesons, incorporating non-perturbative hadronic loop effects to reconcile theoretical predictions with experimental data.

Contribution

The study introduces hadronic loop mechanisms into $ ext{chi}_{c1}$ decay calculations, improving agreement with experimental results and highlighting the importance of non-perturbative QCD effects.

Findings

Hadronic loop contributions align theory with CLEO data.

Inclusion of non-perturbative effects improves decay rate predictions.

Results support further experimental tests at BES-III.

Abstract

The discrepancy between the PQCD calculation and the CLEO data for $\chi_{c1}\to \gamma V$ ($V=\rho^0,\,\omega,\,\phi$) stimulates our interest in exploring extra mechanism of $\chi_{c1}$ decay. In this work, we apply an important non-perturbative QCD effect, i.e., hadronic loop mechanism, to study $\chi_{c1}\to \gamma V$ radiative decay. Our numerical result shows that the theoretical results including the hadronic loop contribution and the PQCD calculation of $\chi_{c1}\to \gamma V$ are consistent with the corresponding CLEO data of $\chi_{c1}\to \gamma V$. We expect further experimental measurement of $\chi_{c1}\to \gamma V$ at BES-III, which will be helpful to test the hadronic loop effect on $\chi_{c1}$ decay.