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

Abstract

The discrepancy between the PQCD calculation and the CLEO data for ${\chi }_{c1}\to \gamma V$ ($V={\rho }^0,\omega ,\varphi$) 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.

7 pages, 2 figures. Accepted for publication in Eur. Phys. J. C

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• Heavy quarkonium: progress, puzzles, and opportunities