Pion valence quark distributions from maximum entropy method

Valence 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 nonperturbativ...

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Bibliographic Details
Published in:Physics letters. B 2020-01, Vol.800, p.135066, Article 135066
Main Authors: Han, Chengdong, Xing, Hanyang, Wang, Xiaopeng, Fu, Qiang, Wang, Rong, Chen, Xurong
Format: Article
Language:English
Subjects:
High Energy Physics - Phenomenology
Maximum entropy method
Physics
Pion
Valence quark distributions
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Summary:Valence 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.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2019.135066