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TeV scale Leptogenesis from decay of next to lightest Neutralino

Authors
  • Adhikari, Rathin
  • Dasgupta, Arnab
Type
Preprint
Publication Date
Feb 08, 2016
Submission Date
Feb 08, 2016
Identifiers
arXiv ID: 1602.02684
Source
arXiv
License
Yellow
External links

Abstract

We show that in $R$-parity violating Minimal Supersymmetric Standard Model (MSSM), both TeV scale leptogenesis and sub-eV neutrino mass are possible after considering three body decay of next to lightest neutralino with only first order lepton number violating interactions in Feynman diagrams for leptonic asymmetry. Since this neutralino has lepton number conserving decay to lightest neutralino also, diagrams with higher order lepton number violating interactions are not required to generate lepton asymmetry (which is otherwise required as stated in Nanopolous-Weinberg theorem resulting in suppression of asymmetry). $CP$ violation comes from relative Majorana phases of lightest and next to lightest neutralino. Soft-breaking gaugino mass parameters in MSSM are required to be lighter than Higgsino mass parameter. Observed baryonic asymmetry could be generated through sphaleron transitions for mass of such neutralino around TeV scale in presence of small ${\slashed R}$ trilinear couplings of about $10^{-3}$ with preferably heavy slepton/squark masses around 50 TeV or above.

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