TY  - JOUR
AU  - Guo, Feng-Kun
AU  - Meißner, Ulf-G.
TI  - Examining Coupled-Channel Effects in Radiative Charmonium Transitions
JO  - Physical review letters
VL  - 108
IS  - 11
CY  - College Park, Md.
PB  - APS
M1  - FZJ-2012-00575
SP  - -112002
PY  - 2012
N1  - 5 pages, 2 figures. Numerical results corrected. Accepted for publication in Phys. Rev. Lett
AB  - 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.
KW  - quarkonium: heavy (INSPIRE)
KW  - coupled channel (INSPIRE)
KW  - charmonium (INSPIRE)
KW  - quenching (INSPIRE)
KW  - lattice (INSPIRE)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000301411300008
DO  - DOI:10.1103/PhysRevLett.108.112002
UR  - https://juser.fz-juelich.de/record/127617
ER  -