Azimuthal asymmetries in lepton-pair production at a fixed-target experiment using the LHC beams (AFTER)

被引：15
|
作者：
Liu, Tianbo [1 ,2 ]
Ma, Bo-Qiang [1 ,2 ,3 ]
机构：
[1] Peking Univ, Sch Phys, Beijing 100871, Peoples R China
[2] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China
[3] Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China
来源：
EUROPEAN PHYSICAL JOURNAL C | 2012年 / 72卷 / 06期
基金：
中国国家自然科学基金;
关键词：
SINGLE-SPIN ASYMMETRIES; FINAL-STATE INTERACTIONS; DRELL-YAN PROCESSES; ANGULAR-DISTRIBUTIONS; HARD-SCATTERING; CROSS-SECTIONS; POLARIZED ANTIPROTONS; PARTON DISTRIBUTIONS; ODD DISTRIBUTION; PI(0) PRODUCTION;
D O I：
10.1140/epjc/s10052-012-2037-7
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
A multi-purpose fixed-target experiment using the proton and lead-ion beams of the LHC was recently proposed by Brodsky, Fleuret, Hadjidakis and Lansberg, and here we concentrate our study on some issues related to the spin physics part of this project (referred to as AFTER). We study the nucleon spin structure through pp and pd processes with a fixed-target experiment using the LHC proton beams, for the kinematical region with 7 TeV proton beams at the energy in center-of-mass frame of two nucleons root s = 115 GeV. We calculate and estimate the cos 2 phi azimuthal asymmetries of unpolarized pp and pd dilepton production processes in the Drell-Yan continuum region and at the Z-pole. We also calculate the sin(2 phi - phi(S)), sin(2 phi + phi(S)) and sin 2 phi azimuthal asymmetries of pp and pd dilepton production processes with the target proton and deuteron longitudinally or transversally polarized in the Drell-Yan continuum region and around Z resonances region. We conclude that it is feasible to measure these azimuthal asymmetries, consequently the three-dimensional or transverse momentum dependent parton distribution functions (3dPDFs or TMDs), at this new AFTER facility.
引用
收藏
页数：15
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