Predictions for double spin asymmetry A(LT) in semi inclusive DIS

Predictions for double spin asymmetry A(LT) in semi inclusive DIS
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半包容 DIS 中双自旋不对称 A(LT) 的预测

DOI:
10.1103/physrevd.73.114017
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发表时间:
2006
期刊:
影响因子:
5
通讯作者:
A. Prokudin
A. Prokudin
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
A. Kotzinian;B. Parsamyan;A. Prokudin

文献摘要

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在半包含深度非弹性散射(SIDIS)的QCD部分子模型的首阶中,由于横极化核子中夸克的纵向极化,产生了双自旋不对称性。相应的k_T^2 $加权分布函数g^{(1)} 1 T}$可以与DIS中测量的普通螺旋度分布g_1(x)$联系起来。利用最近的(非)极化分布和碎裂函数的参数化,我们计算了不同类型强子产生的横极化质子和氘核靶的A_{LT}$不对称性。给出了COMPASS、爱马仕和JLab能量的预测。讨论了洛伦兹不变性关系和正性约束的作用。
In the leading order of QCD parton model of Semi Inclusive Deep Inelastic Scattering (SIDIS) the double spin asymmetry $A_{LT}$ arises due to the longitudinal polarization of quarks in the transversely polarized nucleon. The corresponding $k_T^2$ weighted distribution function $g^{(1)}_{1T}$ can be related to ordinary helicity distribution $g_1(x)$ measured in DIS. Using recent parameterizations for (un)polarized distribution and fragmentation functions we calculated $A_{LT}$ asymmetry on transversely polarized proton and deuteron targets for different types hadron production. The predictions are given for COMPASS, HERMES and JLab energies. The role of Lorentz invariance relations and positivity constraints are discussed.