HAL : in2p3-00658297, version 1
 arXiv : 1111.4695
 Measurement of Transverse Polarization of Electrons Emitted in Free Neutron Decay
 (2011)
 The final analysis of the experiment determining both components of the transverse polarization of electrons ($\sigma_{T_{1}}$, $\sigma_{T_{2}}$) emitted in the $\beta$-decay of polarized, free neutrons is presented. The T-odd, P-odd correlation coefficient quantifying $\sigma_{T_{2}}$, perpendicular to the neutron polarization and electron momentum, was found to be $R=$ 0.004$\pm0.012\pm$0.005. This value is consistent with time reversal invariance, and significantly improves both earlier result and limits on the relative strength of imaginary scalar couplings in the weak interaction. The value obtained for the correlation coefficient associated with $\sigma_{T_{1}}$, $N=$ 0.067$\pm0.011\pm$0.004, agrees with the Standard Model expectation, providing an important sensitivity test of the experimental setup. The present result sets constraints on the imaginary part of scalar and tensor couplings in weak interaction. Implications for parameters of the leptoquark exchange model and minimal supersymmetric model (MSSM) with R-parity violation are discussed.
 équipe(s) de recherche : Interactions fondamentales
 Thème(s) : Physique/Physique Nucléaire Expérimentale
 Lien vers le texte intégral : http://fr.arXiv.org/abs/1111.4695
 in2p3-00658297, version 1 http://hal.in2p3.fr/in2p3-00658297 oai:hal.in2p3.fr:in2p3-00658297 Contributeur : Sandrine Guesnon <> Soumis le : Mardi 10 Janvier 2012, 11:22:42 Dernière modification le : Mardi 10 Janvier 2012, 11:51:07