Constraining the pion distribution amplitude using Drell-Yan reactions on a proton

被引：6

作者：

Xing, H. -y. ^{[1
,2
]}

Ding, M. ^{[3
]}

Cui, Z. -f. ^{[1
,2
]}

Pimikov, A. V. ^{[2
]}

Roberts, C. D. ^{[1
,2
]}

Schmidt, S. M. ^{[3
,4
]}

机构：

[1] Nanjing Univ, Sch Phys, Nanjing 210093, Jiangsu, Peoples R China

[2] Nanjing Univ, Inst Nonperturbat Phys, Nanjing 210093, Jiangsu, Peoples R China

[3] Helmholtz Zentrum Dresden Rossendorf, Bautzner Landstr 400, D-01328 Dresden, Germany

[4] Rhein Westfal TH Aachen, Phys Inst B 3, D-52074 Aachen, Germany

来源：

PHYSICS LETTERS B | 2024年 / 849卷

关键词：

Continuum Schwinger function methods; Drell-Yan process; Dyson-Schwinger equations; Emergence of mass; Pion structure; Quantum chromodynamics; EXCLUSIVE PROCESSES; ANGULAR-DISTRIBUTIONS; ASYMPTOTIC-BEHAVIOR; SPIN ASYMMETRIES; EMERGENCE; NUCLEON;

D O I：

10.1016/j.physletb.2024.138462

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using a reaction model that incorporates pion bound state effects and continuum results for proton parton distributions and the pion distribution amplitude, phi(x), we deliver parameter-free predictions for the mu(+) angular distributions in pi N ->mu(+)mu X- reactions on both unpolarised and polarised targets. The analysis indicates that such angular distributions are sensitive to the pointwise form of phi(x) and suggests that unpolarised targets are practically more favourable. The precision of extant data is insufficient for use in charting phi(x); hence, practical tests of this approach to charting phi(x) must await data with improved precision from new-generation experiments. The reaction model yields a nonzero single-spin azimuthal asymmetry, without reference to T-odd parton distribution functions (DFs). This may necessitate additional care when attempting to extract such T-odd DFs from data.

引用

页数：7

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