Long-distant contribution and χ c1 radiative decays to light vector meson Dian-Yong Chen, Yu-Bing Dong and Xiang Liu Eur. Phys. J. C, 70 1-2 (2010) 177-182 Published online: 05 October 2010 DOI: 10.1140/epjc/s10052-010-1449-5