Left-right supersymmetry after the Higgs boson discovery

Abstract

We perform a thorough analysis of the parameter space of the minimal left-right supersymmetric model in agreement with the LHC data. The model contains left- and right-handed fermionic doublets, two Higgs bidoublets, two Higgs triplet representations, and one singlet, insuring a charge-conserving vacuum. We impose the condition that the model complies with the experimental constraints on supersymmetric particles masses and on the doubly-charged Higgs bosons, and require that the parameter space of the model satisfy the LHC data on neutral Higgs signal strengths at $2\sigma$. We choose benchmark scenarios by fixing some basic parameters and scanning over the rest. The LSP in our scenarios is always the lightest neutralino. We find that the signals for $H\to \gamma \gamma$ and $H \to VV^\star$ are correlated, while $H \to b \bar b$ is anti-correlated with all the other decay modes, and also that the contribution from singly-charged scalars dominate that of the doubly-charged scalars in $H\to \gamma \gamma$ and $H \to Z\gamma$ loops, contrary to Type-II seesaw models. We also illustrate the range for mass spectrum of the LRSUSY model in light of planned measurements of the branching ratio of $H\to \gamma \gamma$ to 10% level.Comment: 38 pages, 9 figures, revised versio

h → γγ in U(1) R -lepton number model with a right-handed neutrino

“…Detailed studies have already been carried out for this particular channel. For example, h → γγ is studied in a wide variety of supersymmetric (SUSY) models namely, the minimal supersymmetric standard model (MSSM) , its next-to-minimal version (NMSSM) [27][28][29][30][31][32][33][34][35], the constrained MSSM (CMSSM) [36][37][38][39][40][41] and also in (B-L)SSM [42][43][44][45], µνSSM [46], left-right supersymmetric models [47], and in U(1) ′ extension of MSSM [48]. In [49], a triplet-singlet extension of MSSM has been studied and µ γγ is computed.…”

Resonant slepton production and right sneutrino dark matter in left-right supersymmetry

“…Two scenarios have been proposed to remedy this situation. One possibility is to introduce an extra singlet Higgs boson so that a stable R-parity-conserving minimum is found once one-loop corrections are added to the potential [51][52][53], while a second option requires to add two new Higgs triplets uncharged under the B − L symmetry Ω(1, 3, 1, 0) and Ω c (1, 1, 3, 0) to break the left-right symmetry spontaneously while conserving R-parity at tree-level [54][55][56]. Here we adopt the former, as it is a more minimal realization, for which we present a short description below.…”

“…We choose a moderate value for tan β so that the bounds stemming from both the direct heavy Higgs-boson searches in the H/A → τ τ channel [84,85] are weaker and the contributions to the rare B s → µµ decay are smaller than for large tan β. This has an additional advantage to suppress the mixing in the neutral Higgs sector, which may challenge the SM-nature of the lightest state and lead to a large deviation from the SM for the h → bb branching ratio [53].…”

Perspectives on a supersymmetric extension of the standard model with a Y = 0 Higgs triplet and a singlet at the LHC

“…of one singlet [26][27][28][29][30] and of one or more triplet superfields of appropriate hypercharges [31][32][33][34][35][36][37]. In particular, the addition of a Y = 0 hypercharge superfield gives large tree-level as well as one-loop corrections to the Higgs masses, and relaxes the fine tuning problem of the MSSM by requiring a lower SUSY mass scale [38][39][40].…”