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Complete 1-Loop Calculation of the T-violating D-Parameter in Neutron Decay in the MSSM

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arxiv hep-ph/0302244 v2 pith:O2IIFFJI submitted 2003-02-26 hep-ph

classification hep-ph
keywords mssmneutroncoefficientdecaydiagramsloopallowedappendix
verification ladder T0 review T1 audit T2 compute T3 formal
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We investigate the violation of time reversal invariance in the decay of the free neutron in the framework of the Minimal Supersymmetric Standard Model (MSSM). The coefficient of the triple product of the neutron spin and the momenta of electron and neutrino, the so called D parameter, is computed at one loop order including all diagrams. We find that D is mainly sensitive to the trilinear A coupling in the squark sector and to the phase of the coefficient \mu which mixes the two Higgs superfields. The maximal MSSM contribution using parameters still allowed by experiment is however at D \approx 10^{-7}, while QED final state interactions give a value of D_{fsi} = - 2.3 * 10^{-5}. Explicit expressions for all relevant diagrams are given in an Appendix.

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Cited by 1 Pith paper

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  1. On the Coulomb corrections in nuclear beta decay

    hep-ph 2024-12 conditional novelty 7.0 of 10

    A new on-shell spinor-helicity framework computes Coulomb corrections in beta decay, reproducing and updating the D parameter and finding a new SM T-odd correlation.

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