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Average polarization of 12B in 12C(μ, ν) 12B(g.s.) reaction: Helicity of the π-decay muon and nature of the weak coupling
Authors
A. De Moura Gonçalves
Ph. Deschepper
+7 more
L. Grenacs
P. Lebrun
J. Lehmann
L. Palffy
A. Possoz
C. Samour
V. L. Telegdi
Publication date
4 December 2012
Publisher
'Elsevier BV'
Doi
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Abstract
The helicity, h -, of μ - in π-decay has been determined as positive (h -≥+0.90) from the average polarization, P av≡〈J B·s μ〉, of 12B produced in the μ -+ 12C→ν μ+ 12B reaction. We obtain also dynamical information on μ-capture: (i) the weak magnetism form factor, μ=4.5±1.1, and (ii) the sum of the induced pseudoscalar (g p) and the 2nd class induced tensor (g T) couplings versus g A, ( g P+g T) g A=7.1±2.7. The latter result, adopting the "canonical" value of g P g A, leads to g T g A=+1±2.7 which is compatible with zero and in strong contradiction with the value {reversed tilde equals}-6 recently advocated by Kubodera, Delorme and Rho. © 1977
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Infoscience - École polytechnique fédérale de Lausanne
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Last time updated on 09/02/2018