Pion susceptibility of the QCD vacuum from an effective quark-quark interaction
نویسندگان
چکیده
Hong-shi Zong, Shi Qi, Wei Chen, Wei-min Sun, and En-guang Zhao 1 Department of Physics, Nanjing University, Nanjing 210093, P. R. China 2 CCAST(World Laboratory), P.O. Box 8730, Beijing 100080, P. R. China and 3 Institute of Theoretical Physics, Academia Sinica, P.O. Box 2735, Beijing 100080, P. R. China Abstract A modified method for calculating the pion vacuum susceptibility from an effective quark-quark interaction model is derived. Within this approach it is shown that the pion vacuum susceptibility is free of ultraviolet divergence and is much smaller than the previous estimations.
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