[Yan, Mengshi; Yan, MS] Peking Univ, Dept Phys, Beijing 100871, Peoples R China.
[Yan, Mengshi; Yan, MS] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China.
[Hou, Tie-Jiun] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
[Nadolsky, Pavel] Southern Methodist Univ, Dept Phys, Dallas, TX 75275 USA.
[Nadolsky, Pavel] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA.