Boer-Mulders effect in the unpolarized pion induced Drell-Yan process at COMPASS within TMD factorization
| Autor: | Wenjuan Mao, Xiaoyu Wang, Zhun Lu |
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| Rok vydání: | 2018 |
| Předmět: |
Particle physics
Physics and Astronomy (miscellaneous) Meson Nuclear Theory FOS: Physical sciences lcsh:Astrophysics 01 natural sciences High Energy Physics - Experiment High Energy Physics - Experiment (hep-ex) Pion High Energy Physics - Phenomenology (hep-ph) Factorization lcsh:QB460-466 0103 physical sciences lcsh:Nuclear and particle physics. Atomic energy. Radioactivity 010306 general physics Nuclear Experiment Engineering (miscellaneous) Quantum chromodynamics Physics 010308 nuclear & particles physics High Energy Physics::Phenomenology Form factor (quantum field theory) Drell–Yan process Coupling (probability) High Energy Physics - Phenomenology Distribution function lcsh:QC770-798 High Energy Physics::Experiment |
| Zdroj: | European Physical Journal C: Particles and Fields, Vol 78, Iss 8, Pp 1-11 (2018) European Physical Journal |
| DOI: | 10.48550/arxiv.1805.03017 |
| Popis: | We investigate the theoretical framework of the $\cos 2\phi$ azimuthal asymmetry contributed by the coupling of two Boer-Mulders functions in the dilepton production unpolarized $\pi p$ Drell-Yan process by applying the transverse momentum dependent factorization at leading order. We adopt the model calculation results of the unpolarized distribution function $f_1$ and Boer-Mulders function $h_1^\perp$ of pion meson from the light-cone wave functions. We take into account the transverse momentum evolution effects for both the distribution functions of pion and proton by adopting the existed extraction of the nonperturbative Sudakov form factor for the pion and proton distribution functions. An approximate kernel is included to deal with the energy dependence of the Boer-Mulders function related twist-3 correlation function $T_{q,F}^{(\sigma)}(x,x)$ needed in the calculation. We numerically estimate the Boer-Mulders asymmetry $\nu_{BM}$ as the functions of $x_p$, $x_\pi$, $x_F$ and $q_T$ considering the kinematics at COMPASS Collaboration. Comment: 11 pages, 2 figures, typos corrected |
| Databáze: | OpenAIRE |
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