中微子散射中轴向质量反常的解决
Resolving the Axial Mass Anomaly in neutrino Scattering
摘要：
我们提出了一个参数化的观察到的增强的横向电子准弹性（QE）的响应函数的碳束缚核子的四个动量转移（Q2）的平方的函数，在一个修正的磁性形状因子的束缚核子。这种参数化也适用于中微子散射的横截面。如果横向增强源自介子交换流（MEC），那么理论上预期纵向或轴向贡献的任何增强都很小。我们提出的“横向增强”模型（仅基于电子散射数据）的中微子和反中微子的微分和总QE截面的核子束缚在碳中的预测。横向增强的2Q2依赖性被观察到解决了QE总截面和低能和高能中微子实验之间的差异分布的长期存在的差异（“轴向质量异常”）。
英文摘要：
We present a parametrization of the observed enhancement in the transverse electron quasielastic (QE) response function for nucleons bound in carbon as a function of the square of the four momentum transfer (Q2) in terms of a correction to the magnetic form factors of bound nucleons. The parametrization should also be applicable to the transverse cross section in neutrino scattering. If the transverse enhancement originates from meson exchange currents (MEC), then it is theoretically expected that any enhancement in the longitudinal or axial contributions is small. We present the predictions of the "Transverse Enhancement" model (which is based on electron scattering data only) for the neutrino and anti-neutrino differential and total QE cross sections for nucleons bound in carbon. The 2Q2 dependence of the transverse enhancement is observed to resolve much of the long standing discrepancy ("Axial Mass Anomaly}) in the QE total cross sections and differential distributions between low energy and high energy neutrino experiments on nuclear targets.
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