A supersymmetric theory of baryogenesis and sterile sneutrino dark matter from B mesons

Abstract

Low-scale baryogenesis and dark matter generation can occur via the production of neutral B mesons at MeV temperatures in the early Universe, which undergo CP-violating oscillations and subsequently decay into a dark sector. In this work, we discuss the consequences of realizing this mechanism in a supersymmetric model with an unbroken U (1) R symmetry which is identified with baryon number. B mesons decay into a dark sector through a baryon number conserving operator mediated by TeV scale squarks and a GeV scale Dirac bino. The dark sector particles can be identified with sterile neutrinos and their superpartners in a type-I seesaw framework for neutrino masses. The sterile sneutrinos are sufficiently long lived and constitute the dark matter. The produced matter-antimatter asymmetry is directly related to observables measurable at B factories and hadron colliders, the most relevant of which are the semileptonic-leptonic asymmetries in neutral B meson systems and the inclusive branching fraction of B mesons into hadrons and missing energy. We discuss model independent constraints on these experimental observables before quoting predictions made in the supersymmetric context. Constraints from astrophysics, neutrino physics and flavor observables are studied, as are potential LHC signals with a focus on novel long lived particle searches which are directly linked to properties of the dark sector.

Expression of interest for the CODEX-b detector

“…[66,67] for similar ideas involving heavy flavor mesons and Ref. [168] for a supersymmetric realization). This enables very low reheating temperatures and is moreover directly testable by experiments such as CODEX-b, as well as Belle II.…”

“…This scenario can arise e.g. in models that address the baryogenesis puzzle [66,67,[166][167][168], as described in Sect. 2.4.9.…”

Oscillations of $$ {B}_s^0 $$ Mesons as a Probe of Decays with Unreconstructed Particles

“…involving neutrons, and for searches beyond the SM, such as decays with heavy neutrinos, axion-like particles and other dark matter candidates (e.g. [10][11][12]). The benchmark measurements that should be feasible already with the currently available LHCb dataset could employ Cabibbo-favoured open-charm decays such as B 0 s → D − s pn.…”

“…involving neutrons, and for searches beyond the SM. One particular example of the processes beyond the SM that satisfy the above conditions is the model suggested in [10][11][12], where heavy invisible particle is accompanied by a SM baryon. As a benchmark SM decay mode, one can consider the decay B 0 s → D − s pn, which satisfies both conditions and should have a significant rate since it proceeds via the favoured b → c transition.…”

Impact of leptonic unitarity and dark matter direct detection experiments on the NMSSM with inverse seesaw mechanism

“…We showed by both analytic formulas and numerical calculations that the resulting theory (abbreviated as ISS-NMSSM hereafter) was one of the most economic framework to generate the neutrino mass and, meanwhile, to reconcile the DM DD experiments naturally [8,14]. We add that, besides us, a lot of authors have showed interest in the sneutrino DM in recent years [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36], but none of them considered the same theoretical framework as ours.…”