Examining coupled-channel effects in radiative charmonium transitions

Details Examining coupled-channel effects in radiative charmonium transitions Examining coupled-channel effects in radiative charmonium transitions

2011-11-04

arxiv.org/abs/1111.1151v2

Phys.Rev.Lett.108: 112002, 2012

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 2 figures. Numerical results corrected. Accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.108.112002

Coupled-channel effects due to coupling of charmonia to the charmed and anticharmed mesons are of current interest in heavy quarkonium physics. However, the effects have not been unambiguously established. In this paper, a clean method is proposed in order to examine the coupled-channel effects in charmonium transitions. We show that the hindered M1 radiative transitions from the 2P to 1P charmonia are suitable for this purpose. We suggest to measure one or more of the ratios Gamma(h_c'-->chi_{cJ} gamma)/Gamma(chi_{cJ}'-->chi_{cJ} pi^0) and Gamma(chi_{cJ}'-->h_c gamma)/Gamma(chi_{cJ}'-->chi_{cJ} pi^0), for which highly nontrivial and parameter-free predictions are given. The picture can also be tested using both unquenched and quenched lattice calculations.

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