Understanding the e(+)e(-) -> D(()*())+ D(()*())-processes observed by Belle

作者：Liu Kui Yong^*; He Zhi Guo; Zhang Yu Jie; Chao Kuang Ta

来源：Journal of Physics G: Nuclear and Particle Physics , 2010, 37(4): 045005.

DOI：10.1088/0954-3899/37/4/045005

We calculate the production cross sections for D*(+)D*(-), D(+)D*(-) and D(+)D(-) in e(+)e(-) annihilation through one virtual photon in the framework of perturbative QCD with constituent quarks. The calculated cross sections for D*(+)D*(-) and D(+)D*(-) production are roughly in agreement with the recent Belle data. The helicity decomposition for D* meson production is also calculated. The fraction of the D*(+/-)(L)L D(T)*(Tau)(T) final state in the e(+)e(-) -> D*(+)D*(-) process is found to be 65%. The fraction of DD*(T) production is 100% and DD*(L) is forbidden in e(+)e(-) annihilation through one virtual photon. We further consider e(+)e(-) annihilation through two virtual photons, and then find the fraction of DD*(T) in the e(+)e(-) -> DD* process to be about 91%.

• 出版日期2010-4
• 单位辽宁大学; 北京大学; 中国高等科学技术中心