COMPASS实验中DIS强子的横动量与方位角分布
Transverse momentum and azimuthal angle distributions of hadrons in DIS at COMPASS
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中文总结 AI 辅助
该研究利用COMPASS实验2016年高统计量数据，分析半单举深度非弹性散射中强子多重数及方位角调制，提取了与Cahn效应、Boer-Mulders函数相关的非极化不对称度和束流自旋不对称度。
中文摘要 AI 辅助
COMPASS实验在核子结构研究中扮演着重要角色。2016-2017年使用非极化液氢靶和纵向极化160 GeV/$c$缪子束进行的测量，为半单举深度非弹性散射分析提供了高统计量数据样本，从而能够获取横向动量依赖的部分子分布和碎裂函数。2016年数据集被用于确定DIS中产生的强子多重数，其微分变量为$x$、$Q^2$和$P_\text{T}$，以及强子方位角分布中的方位角调制振幅。特别是，非极化不对称度$A^{\cos \phi_\text{h}}_\text{UU}$（与Cahn效应相关）、$A^{\cos 2\phi_\text{h}}_\text{UU}$（对Boer-Mulders函数敏感）以及束流自旋不对称度$A^{\sin \phi_\text{h}}_\text{LU}$，在4维分箱中提取，这些分箱与多重数测量的分箱一致，并且还对某些变量进行了积分。
英文摘要
The COMPASS experiment plays an important role in studies of nucleon structure. Measurements performed in 2016-2017 with an unpolarised liquid hydrogen target and a longitudinally polarised 160 GeV/$c$ muon beam provide a high-statistics data sample for the analysis of semi-inclusive deep-inelastic scattering, giving access to transverse-momentum-dependent parton distribution and fragmentation functions. The 2016 data set was analysed to determine the multiplicities of hadrons produced in DIS differential in $x$, $Q^2$ and $P_\text{T}$, as well as the amplitudes of azimuthal modulations in the hadron azimuthal-angle distributions. In particular, the unpolarised asymmetries $A^{\cos ϕ_\text{h}}_\text{UU}$ (related to the Cahn effect), $A^{\cos 2ϕ_\text{h}}_\text{UU}$ (sensitive to the Boer--Mulders function), and the beam-spin asymmetry $A^{\sin ϕ_\text{h}}_\text{LU}$ were extracted in 4-dimensional bins matching those of the multiplicities, and also integrated over some of the variables.
