Drell-Yan在COMPASS实验中的测量

Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020) Pub Date : 2021-02-13 DOI:10.22323/1.390.0488

M. Meyer-Conde

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引用次数: 0

摘要

在2015年和2018年，欧洲核子研究中心的COMPASS实验使用190 GeV π−光束撞击横向极化的NH3和非极化的核目标(27Al, 184W)，测量了dll - yan (DY)和J/Psi通道中的介子对产生。除了两个过程的绝对横截面测量外，COMPASS还研究了两个通道中目标自旋(in)相关的方位角不对称性。假设价夸克-反夸克湮灭是主要的产生机制，人们可以根据介子和质子的横向动量依赖(TMD)部子分布函数(pdf)的卷积来解释方位角不对称。TMD pdf是通用的QCD对象，提供了三维动量空间中部分密度的映射。COMPASS最近获得的DY和J/ψ通道的结果将与互补的半包容DIS (SIDIS)测量和理论预测一起讨论。

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Drell-Yan measurements at the COMPASS experiment

In 2015 and 2018 the COMPASS experiment at CERN measured muon-pair production in the Drell-Yan (DY) and J/Psi channels using a 190 GeV π− beam impinging on a transversely polarized NH3 and unpolarized nuclear targets (27Al, 184W). Apart from the absolute cross-section measurements for both processes, COMPASS studies also the target spin (in)dependent azimuthal asymmetries in both channels. Assuming the valence quark-antiquark annihilation to be the main production mechanism, one can interpret the azimuthal asymmetries in terms of convolutions of pion and proton Transverse Momentum Dependent (TMD) Parton Distribution Functions (PDFs). The TMD PDFs are universal QCD objects providing a mapping of parton densities in 3D momentum space. Recent results obtained by COMPASS for the DY and J/ψ channels will be discussed along with complementary semi-inclusive DIS (SIDIS) measurements and theoretical predictions.

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Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020)

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