Pion valence quark distributions from maximum entropy method

Publication date: Available online 31 October 2019Source: Physics Letters BAuthor(s): Chengdong Han, Hanyang Xing, Xiaopeng Wang, Qiang Fu, Rong Wang, Xurong ChenAbstractValence quark distributions of pion at very low resolution scale Q02∼0.1 GeV2 are deduced from a maximum entropy method, under the assumption that pion consists of only a valence quark and a valence anti-quark at such a low scale. Taking the obtained initial quark distributions as the nonperturbative input in the modified Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (with the GLR-MQ-ZRS corrections) evolution, the generated valence quark distribution functions at high Q2 are consistent with the measured ones from a Drell-Yan experiment. The maximum entropy method is also applied to estimate the valence quark distributions at relatively higher Q2=0.26GeV2. At this higher scale, other components (sea quarks and gluons) should be considered in order to match the experimental data. The first three moments of pion quark distributions at high Q2 are calculated and compared with the other theoretical predictions.

Source: Physics Letters B - November 13, 2019 Category: Physics Source Type: research