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arXiv · 1301.1358

Radiative corrections to anti-neutrino proton scattering

Udit Raha·Fred Myhrer·Kuniharu Kubodera
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Abstract

The inverse $\beta$-decay reaction, $ \bar{\nu}_e p \to e^+ n$, for low-energy anti-neutrinos coming from nuclear reactors is of great current interest in connection with high-precision measurements of the neutrino mixing angle $\theta_{13}$. We have derived analytic expressions, up to next-to-leading order in heavy-baryon chiral perturbation theory, for the radiative corrections (RCs) and the nucleon-recoil corrections both for this reaction and for the related neutron $\beta$-decay process. We show that the recoil corrections, which include the "weak magnetism" contribution, are small for neutron $\beta$-decay, but for inverse $\beta$-decay, the recoil corrections are comparable in size to the RCs for typical energies of reactor anti-neutrinos, and they have opposite signs. The RCs and the recoil corrections exhibit very different dependences on the neutrino energy.

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Udit Raha, Fred Myhrer, Kuniharu Kubodera. 2013-01-07. Radiative corrections to anti-neutrino proton scattering. https://arxiv.org/abs/1301.1358

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