Mass spectrum and Higgs profile inB−Lsymmetric SSM

Abstract

We investigate the predictions on the mass spectrum and Higgs boson decays in the supersymmetric standard model extended by U (1) B−L symmetry (BLSSM). The model requires two singlet Higgs fields, which are responsible for the radiative breaking of U (1) B−L symmetry. It predicts degenerate right-handed neutrino masses (1.7 − 2.2 TeV) as well as the right-handed sneutrinos of mass 4 TeV. The presence of right-handed neutrinos and sneutrinos trigger the baryon and lepton number violation processes, until they decouple from the Standard model particles. Besides, the model predicts rather heavy colored particles; mt, mb 1.5 TeV, while mτ 100 GeV and mχ± 1 600 GeV. Even though, the implications are similar to minimal supersymmetric standard model, BLSSM can predict another Higgs boson lighter than 150 GeV. We find that the second Higgs boson can be degenerate with the lightest CP-even Higgs boson of mass about 125 GeV and contribute to the Higgs decay into two photons. In addition, it can provide an explanation for the excess in h → 4l at the mass scale ∼ 145 GeV.

Exploring the supersymmetric U(1)B−L×UFrank1, Özdal2 2018Phys. Rev. DSelf Cite7010View full textAdd to dashboardCite

“…Even though it is possible to find light stop solutions (m t1 ≤ 1 TeV) when 340 GeV ≤ m χ 0 1 ≤ 550 GeV, the relic density condition is not satisfied for these solutions. Moreover, unlike the results of BLSSM [16] where the lightest chargino masses are always above 600 GeV, here the m χ ± 1 − m χ 0 1 plot shows that there is a region of parameter space where lightest chargino solutions is nearly degenerate with the lightest neutralino when 300 GeV ≤ m χ 0 1 ≤ 500 GeV. These solutions correspond to the case where the lightest chargino decays into the neutralino LSP and W/W boson ( χ ± 1 → χ 0 1 + W ± (W ± )), and the branching ratio for this channel is almost 1.…”

“…On the other hand, the m 0 − A 0 /m 0 panel shows that the regions with larger m 0 values prefer positive values of the trilinear scalar interaction strength A 0 , while almost all solutions with consistent relic density have positive A 0 parameter. Unlike the B − L Supersymmetric Standard Model (BLSSM) [16], where negative A 0 solutions for m 0 ≥ 1 TeV do not satisfy REWSB, here all LSP constraints can be fulfilled for this portion of parameter space, while only the relic density constraint imposes positivity of A 0 . The M 1/2 − tan β plot indicates that it is possible to find solutions with 0.09 ≤ Ω DM h 2 ≤ 0.14 only for large tan β values, 40 ≤ tan β ≤ 60, although it is easier to satisfy LHC limitations for low tan β values.…”

“…Note that there is also a µ S term to generate non-zero neutrino masses with inverse seesaw mechanism, and as customary, it is restricted to have a low value, as it cannot give important contributions to any other sector except for neutrinos. Contrary to BLSSM [15][16][17], where neutrinos have Majorana mass terms, N c i fields interact with X R and S through Y ij s N c i X R S term, and lead to SM-singlet pseudo-Dirac mass eigenstates. Besides, the interaction of the SU (2) L singlet Higgs fields X R , S and N c i yield a significant contribution to the masses of the extra Higgs bosons.…”

Realization of sneutrino self-interacting dark matter in the focus point supersymmetry

“…On the other hand, the focus point mechanism [10][11][12][13][14][15][16][17][18][19][20], who represents second approach, keeping heavy enough sparticles to lift higgs mass while remaining fine-tuning under control. Above two schemes can be even combined in gauge extension SUSY framework, such as U (1) B−L extended MSSM model (BLSSM) [21][22][23][24][25] which is the main focus of this paper.…”

“…The phenomenology of BLSSM with heavy Z (the gauge boson associated with U (1) B−L symmetry) has been extensively explored [21][22][23][41][42][43], and case for light Z [44] is also interesting since it can account for novel Be anomaly [45][46][47][48]. Notice that light Z causes similar little hierarchy problem as in MSSM which motivating the proposal of double focus point (DFP) mechanism [24] to solve this problem.…”