标题： 高能强子螺旋度破坏：螺旋度翻转形式因子的测量 显示英文标题

标题： High Energy Hadronic Helicity Violation: What Helicity Flip Form Factors Measure

摘要： 轨道角动量对于在冲激近似下的微扰QCD中大动量转移的若干过程的描述至关重要。 我们回顾了独立散射的机制，该机制使得在领先阶次下，在无需要翻转夸克螺旋性的情况下违背螺旋性守恒规则成为可能——尤其是在非弹性介子-介子反应中。 我们主张，违背传统方法因子化假设的螺旋性翻转形式因子（被归类为“高旋”）在纳入非零轨道角动量信息后，仍然可以在微扰QCD的领先阶次上进行计算。 显示英文摘要

摘要： Orbital angular momentum is crucial for the description of several process at large momentum transfer in the impulse approximation in perturbative QCD. We review the mechanism of independent scattering which makes violation of the helicity conservation rule possible at leading order - and without any need to flip a quark helicity - in exclusive hadron-hadron reactions. We argue that helicity flip form factors, which violate the factorization assumptions of conventional approaches and are classified as ``higher-twist," are nevertheless calculable to leading order in perturbative QCD when information on non-zero orbital angular momentum is incorporated.