LSP baryogenesis and neutron-antineutron oscillations from R-parity violation

• Main Authors: Lorenzo Calibbi, Eung Jin Chun, Chang Sub Shin
• Format: Article
• Language: English
• Published: SpringerOpen 2017-10-01
• Series: Journal of High Energy Physics
• Subjects: Cosmology of Theories beyond the SM; CP violation; Supersymmetric Standard Model
• Online Access: http://link.springer.com/article/10.1007/JHEP10(2017)177

Abstract R-parity and baryon number violating operators can be allowed in the Super-symmetric Standard Model and thus lead to interesting baryon number violating processes such as n − n ¯ $$ n-\overline{n} $$ oscillations and baryogenesis of the Universe via the decay of the lightest supersymmetric particle (LSP). Adopting the LSP baryogenesis mechanism realized by the late decay of the axino, we identify a single coupling λ 313 ′ ′ as a common origin for the matter-antimatter asymmetry of the Universe as well as potentially observable n − n ¯ $$ n-\overline{n} $$ oscillation rates. From this, rather strong constraints on the supersymmetry breaking masses and the axion decay constant are obtained. The favoured parameter space of λ 313 ′ ′ ∼ 0.1 and sub-TeV masses for the relevant sparticles is readily accessible by the current and future LHC searches.