| Autor: |
Barry PC; Jefferson Lab, Newport News, Virginia 23606, USA., Ji CR; Department of Physics, North Carolina State University, Raleigh, North Carolina 27695, USA., Sato N; Jefferson Lab, Newport News, Virginia 23606, USA., Melnitchouk W; Jefferson Lab, Newport News, Virginia 23606, USA. |
| Jazyk: |
angličtina |
| Zdroj: |
Physical review letters [Phys Rev Lett] 2021 Dec 03; Vol. 127 (23), pp. 232001. |
| DOI: |
10.1103/PhysRevLett.127.232001 |
| Abstrakt: |
We perform the first global QCD analysis of pion valence, sea quark, and gluon distributions within a Bayesian Monte Carlo framework with threshold resummation on Drell-Yan cross sections at next-to-leading log accuracy. Exploring various treatments of resummation, we find that the large-x asymptotics of the valence quark distribution ∼(1-x)^{β_{v}} can differ significantly, with β_{v} ranging from ≈1 to >2.5 at the input scale. Regardless of the specific implementation, however, the resummation induced redistribution of the momentum between valence quarks and gluons boosts the total momentum carried by gluons to ≈40%, increasing the gluon contribution to the pion mass to ≈40 MeV. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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