Direct detection of the Wino and Higgsino-like neutralino dark matter at one-loop level

Exploring MSSM parameter space after the discovery of Higgs Boson at 125 GeV naturally demands large top-squark mixing or large trilinear coupling parameter A t in particular, so as to avoid excessively heavy squark, specially for the universal models like CMSSM. We study stability of electroweak symmetry breaking vacua in possible presence of deeper charge-color symmetry breaking minima within MSSM. Besides stable vacua, we consider scenarios characterized by the presence of global CCB minima, with SM like charge and color conserving vacuum, having stability over cosmologically large lifetime (long-lived states). We allow vacuum expectation values for both stop as well as sbottom fields, since these belong to the third generation of sfermions with larger Yukawa couplings that have immediate effect on the tunneling time. Moreover, for large µ regions, radiative corrections to Higgs boson mass from bottom-squark loop is quite significant. Regions of MSSM parameters space become viable for large A t and large µ zones which are generically excluded via the traditional analytical CCB constraints. For a large value of tan β, safe vacua associated with large values of |µ| and |A t | are predominantly long-lived and may be associated with relatively light stop masses. We also identify low µ regions associated with long-lived states. Both the above zones can be friendly to muon g − 2 constraint. We also impose constraints from Br(B → X s γ) and Br(B s → µ + µ − ). We do the analysis for a moderate and a large tan β. We choose an example parameter point in the gaugino mass plane of M 1 , M 2 that satisfies the dark matter constraints, basically a decoupled sector with respect to CCB.

Section: Compatibility With Dark Matter Related Constraintssupporting

confidence: 77%

Section: Compatibility With Dark Matter Related Constraintsmentioning

confidence: 99%

Exploring MSSM for charge and color breaking and other constraints in the context of Higgs@125 GeV

Chattopadhyay

Dey

2014

“…level [139][140][141][142], and its scattering cross section is evaluated at the next-to-leading order in ref. [143]: for instance, σ SI 2 × 10 −47 cm 2 for a 3 TeV real triplet DM, which is well above the neutrino background [144].…”

Section: Jhep10(2015)193mentioning

confidence: 99%

Weakly-interacting massive particles in non-supersymmetric SO(10) grand unified models

Nagata

Olive

Zheng

2015

Non-supersymmetric SO(10) grand unified theories provide a framework in which the stability of dark matter is explained while gauge coupling unification is realized. In this work, we systematically study this possibility by classifying weakly interacting dark matter candidates in terms of their quantum numbers of SU(2) L ⊗ U(1) Y , B − L, and SU(2) R . We consider both scalar and fermion candidates. We show that the requirement of a sufficiently high unification scale to ensure a proton lifetime compatible with experimental constraints plays a strong role in selecting viable candidates. Among the scalar candidates originating from either a 16 or 144 of SO(10), only SU(2) L singlets with zero hypercharge or doublets with Y = 1/2 satisfy all constraints for SU(4) C ⊗ SU(2) L ⊗ SU(2) R and SU(3) C ⊗ SU(2) L ⊗ SU(2) R ⊗ U(1) B−L intermediate scale gauge groups. Among fermion triplets with zero hypercharge, only a triplet in the 45 with intermediate group SU(4) C ⊗ SU(2) L ⊗ SU(2) R leads to solutions with M GUT > M int and a long proton lifetime. We find three models with weak doublets and Y = 1/2 as dark matter candidates for the SU(4) C ⊗ SU(2) L ⊗ SU(2) R and SU(4) C ⊗ SU(2) L ⊗ U(1) R intermediate scale gauge groups assuming a minimal Higgs content. We also discuss how these models may be tested at accelerators and in dark matter detection experiments.

“…The LUX [145] experiment puts strong bounds on spin-independent (SI) DM direct detection cross-sections. The χ 0 1 −nucleon scattering cross-section that LUX relies on is enhanced for sufficient gaugino-higgsino mixing [146]. However, in our scenario the cross section is supposed to be small for LSP being so pure, either a higgsino or a…”

Section: Jhep09(2017)064mentioning

confidence: 99%

“…with θ W being the Weinberg angle. Similarly, for the wino-LSP case, the couplings are as follows [146]:…”

Section: Jhep09(2017)064mentioning

confidence: 99%

How light a higgsino or a wino dark matter can become in a compressed scenario of MSSM

Chakraborti¹,

Chattopadhyay²,

Poddar³

2017

Higgsinos and Wino have strong motivations for being Dark Matter (DM) candidates in supersymmetry, but their annihilation cross sections are quite large. For thermal generation and a single component DM setup the higgsinos or wino may have masses of around 1 or 2-3 TeV respectively. For such DM candidates, a small amount of slepton coannihilation may decrease the effective DM annihilation cross section. This, in turn reduces the lower limit of the relic density satisfied DM mass by more than 50%. Almost a similar degree of reduction of the same limit is also seen for squark coannihilations. However, on the contrary, for near degeneracy of squarks and higgsino DM, near its generic upper limit, the associated coannihilations may decrease the relic density, thus extending the upper limit towards higher DM masses. We also compute the direct and indirect detection signals. Here, because of the quasi-mass degeneracy of the squarks and the LSP, we come across a situation where squark exchange diagrams may contribute significantly or more strongly than the Higgs exchange contributions in the spin-independent direct detection cross section of DM. For the higgsino-DM scenario, we observe that a DM mass of 600 GeV to be consistent with WMAP/PLANCK and LUX data for sfermion coannihilations. The LUX data itself excludes the region of 450 to 600 GeV, by a half order of magnitude of the cross-section, well below the associated uncertainty. The similar combined lower limit for a wino DM is about 1.1 TeV. There is hardly any collider bound from the LHC for squarks and sleptons in such a compressed scenario where sfermion masses are close to the mass of a higgsino/wino LSP.