中微子螺旋度反射与基本对称性
Neutrino Helicity Reversal and Fundamental Symmetries
摘要：
一个相当难以捉摸的螺旋性反转发生在一个gedanken实验中，在这个实验中，一个质量很大的左手狄拉克中微子，以u < c的速度运动，在高速公路上被一辆超速行驶的汽车（以v的速度运动，u < v < c）超过。也就是说，在经过中微子之后，回头看，人们会看到一个右手中微子（这在自然界中从未被观察到）。右手中微子的洛伦兹不变质量仍然与通过之前相同。因此，格丹肯实验暗示了右手轻中微子的存在，它们并非完全无菌。此外，超过一群大量的右手狄拉克中微子会导致逐渐的去灭菌。我们讨论了螺旋度反转和伴随的消毒和消毒机制的一个说明性的例子计算的方式，特别强调大量狄拉克和马约拉纳中微子。我们对比的形式主义与修改后的狄拉克中微子描述的狄拉克方程与赝标量质量项成比例的第五电流。
英文摘要：
A rather elusive helicity reversal occurs in a gedanken experiment in which a massive left-handed Dirac neutrino, traveling at a velocity u < c, is overtaken on a highway by a speeding vehicle (traveling at velocity v with u < v < c). Namely, after passing the neutrino, looking back, one would see a right-handed neutrino (which has never been observed in nature). The Lorentz-invariant mass of the right-handed neutrino is still the same as before the passing. The gedanken experiment thus implies the existence of right-handed, light neutrinos, which are not completely sterile. Furthermore, overtaking a bunch of massive right-handed Dirac neutrinos leads to gradual de-sterilization. We discuss the helicity reversal and the concomitant sterilization and de-sterilization mechanisms by way of an illustrative example calculation, with a special emphasis on massive Dirac and Majorana neutrinos. We contrast the formalism with a modified Dirac neutrino described by a Dirac equation with a pseudoscalar mass term proportional to the fifth current.
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