【摘 要】
：
高能强子-强子反应实验中已经发现了一系列出乎人们想象的自旋效应,其中单极化强子-强子反应中产生的强子有左右不对称。实验表明,在用横向极化的强子与非极化的强子靶(或原
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高能强子-强子反应实验中已经发现了一系列出乎人们想象的自旋效应,其中单极化强子-强子反应中产生的强子有左右不对称。实验表明,在用横向极化的强子与非极化的强子靶(或原子核)碰撞时,末态强子的产生截面有明显的方位角依赖,强子向左发射的几率和向右发射的概率不一样,存在明显的左右不对称(左右是相对于横向极化方向和入射束方向确定的平面而言的)。而leadingtwist下微扰QCD计算的结果为零,意味着左右对称,直到现在人们仍在努力寻找它的来源。
A series of spin-effects beyond the human imagination have been found in the high-energy hadron-hadron reaction experiments, in which the hadrons generated in the unipolar Hadron-Hadron reaction have left-right asymmetry. Experiments show that in the case of colliding with a non-polar hadron and a non-polar hadron (or nucleus), the produced cross section of the hadron has a significant azimuthal dependence and the probability of the hadron emitting to the left and the right The probability of emission is different, with a noticeable left-right asymmetry (left and right with respect to the plane defined by the direction of the transverse polarization and the direction of the incident beam). However, the result of the perturbation QCD calculation under leadingtwist is zero, which means it is bilaterally symmetric, until now people are still trying to find its source.
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