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arXiv 0907.3000hep-ph
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各向同性介质中的Angular momentum非守恒衰变

Angular momentum non-conserving decays in isotropic media

José F. Nieves, Palash B. Pal

摘要:

由于角动量守恒而在真空中被禁止的各种过程可以在各向同性且不携带任何角动量的介质中发生。我们通过明确考虑两个例子来说明这一点。第一个是一个自旋为0的粒子衰变为光子和另一个自旋为0的粒子,使用的模型涉及汤川相互作用的标量粒子与带电费米子场。第二种是在线性化引力耦合的粒子相互作用标准模型中,一个中微子衰变为另一个中微子和一个引力子。

英文摘要:

Various processes that are forbidden in the vacuum due to angular momentum conservation can occur in a medium that is isotropic and does not carry any angular momentum. We illustrate this by considering explicitly two examples. The first one is the decay of a spin-0 particle into a photon and another spin-0 particle, using a model involving the Yukawa interactions of the scalar particles with a charged fermion field. The second one involves the decay of a neutrino into another neutrino and a graviton, in the standard model of particle interactions augmented with the linearized gravitational couplings.

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