标题： μ子在极化氘靶上产生带电强子的方位不对称性 显示英文标题

标题： Azimuthal asymmetries in production of charged hadrons by high energy muons on polarized deuterium targets

摘要： 在160 GeV缪子与纵向极化的氘核靶的半初态带电强子产生中，进行了方位不对称性的搜索，使用的是2002-2004年的COMPASS数据。 观察到的不对称性在动量变量积分后不依赖于产生的强子的方位角，并且与比值$g_1^d(x)/f_1^d(x)$一致。 考虑到不同部分子分布函数和部分子碎裂函数可能的贡献，以及夸克的横向自旋，对这些不对称性进行了参数化。它们可以被（或/和）$\sin(\phi), \sin(2\phi), \sin(3\phi)$和$\cos(\phi)$调制。 研究了这些振幅的$x$、$z$和$p_h^T$依赖性。 显示英文摘要

摘要： Search for azimuthal asymmetries in semi-inclusive production of charged hadrons by 160 GeV muons on the longitudinally polarized deuterium target, has been performed using the 2002- 2004 COMPASS data. The observed asymmetries integrated over the kinematical variables do not depend on the azimuthal angle of produced hadrons and are consistent with the ratio $g_1^d(x)/f_1^d(x)$. The asymmetries are parameterized taking into account possible contributions from different parton distribution functions and parton fragmentation functions depending on the transverse spin of quarks.They can be modulated (either/or/and) with $\sin(\phi), \sin(2\phi), \sin(3\phi)$ and $\cos(\phi)$. The $x$-, $z$- and $p_h^T$-dependencies of these amplitudes are studied.