https://doi.org/10.1140/epjc/s10052-011-1542-4
Regular Article - Theoretical Physics
Light flavor asymmetry of nucleon sea
1
School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, 100871, China
2
Center for High Energy Physics, Peking University, Beijing, 100871, China
* e-mail: mabq@pku.edu.cn
Received:
9
July
2010
Revised:
22
October
2010
Published online:
1
February
2011
The light flavor antiquark distributions of the nucleon sea are calculated in the effective chiral quark model and compared with experimental results. The contributions of the flavor-symmetric sea-quark distributions and the nuclear EMC effect are taken into account to obtain the ratio of Drell–Yan cross sections σ
pD/2σ
pp, which can match well with the results measured in the FermiLab E866/NuSea experiment. The calculated results also match the 
measured in different experiments, but unmatch the behavior of 
derived indirectly from the measurable quantity σ
pD/2σ
pp by the FermiLab E866/NuSea Collaboration at large x. We suggest to measure again at large x from precision experiments with careful treatment of the experimental data. We also propose an alternative procedure for experimental data treatment.
© Springer-Verlag / Società Italiana di Fisica, 2011
