Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Right-handed Electrons in Radiative Muon Decay   Electrons emitted in the radiative decay mu^- -> e^- anti-nu_e nu_mu gamma
have a significant probability of being right-handed, even in the limit m_e ->
0. Such ``wrong-helicity'' electrons, arising from helicity-flip
bremsstrahlung, contribute an amount alpha/(4 pi) Gamma_0 to the muon decay
width (Gamma_0 = G_F^2 m^5_mu/ (192 pi^3)). We use the helicity-flip splitting
function D_hf (z) of Falk and Sehgal (Phys. Lett. B 325, 509 (1994)) to obtain
the spectrum of the right-handed electrons and the photons that accompany them.
For a minimum photon energy E_gamma = 10 MeV (20 MeV), approximately 4% (7%) of
electrons in radiative mu-decay are right-handed.

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The categories of this paper are: cmp-lg
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The categories of this paper are: astro-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: econ
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The categories of this paper are: hep-th
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The categories of this paper are: cond-mat
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The categories of this paper are: plasm-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: q-alg
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The categories of this paper are: chao-dyn
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The categories of this paper are: physics
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: chem-ph
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The categories of this paper are: eess