Mixed neutralino dark matter in nonuniversal gaugino mass models

Chattopadhyay, Utpal; Das, Debottam; Roy, D. P.

doi:10.1103/physrevd.79.095013

Cited by 43 publications

(43 citation statements)

References 74 publications

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“…Depending on the model, one might suppose that one of the other three representations dominates the contribution to gaugino masses, or that two or more of the representations contribute in comparable amounts. The resulting phenomenology has been studied in many papers; for examples, see [12]- [31]. The purpose of this paper is to extend these results to the case of unified groups SO(10) and E 6 , and all of their proper subgroups that embed SU(3) C × SU(2) L × U(1) Y in a way consistent with the Standard Model chiral fermion content.…”

Section: Introductionmentioning

confidence: 99%

Nonuniversal gaugino masses from nonsingletF-terms in nonminimal unified models

Martin

2009

Phys. Rev. D

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In phenomenological studies of low-energy supersymmetry, running gaugino masses are often taken to be equal near the scale of apparent gauge coupling unification. However, many known mechanisms can avoid this universality, even in models with unified gauge interactions. One example is an F -term vacuum expectation value that is a singlet under the Standard Model gauge group but transforms non-trivially in the symmetric product of two adjoint representations of a group that contains the Standard Model gauge group. Here, I compute the ratios of gaugino masses that follow from F -terms in non-singlet representations of SO (10) and E 6 and their subgroups, extending well-known results for SU (5). The SO(10) results correct some long-standing errors in the literature. Contents

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Section: Introductionmentioning

confidence: 99%

Nonuniversal gaugino masses from nonsingletF-terms in nonminimal unified models

Martin

2009

Phys. Rev. D

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“…In this paper, we consider the MSSM framework with non-universal gauginos (M 1 = M 2 = M 3 ) and explore the regions with acceptable finetuning. Non-universal SSB mass terms for the gauginos can be realized when the gaugino masses are generated with Fterms, which are not singlet under the GUT gauge group [14][15][16][17][18]. It has been pointed out in [19] that if the bilinear Higgs mixing is set to be negative (μ < 0), then the results exhibit more tendency to yield much lower fine-tuning and even light stop solutions, even as light as top quark.…”

Section: Introductionmentioning

confidence: 99%

Light stops and fine-tuning in MSSM

2018

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We discuss the fine-tuning issue within the MSSM framework. Following the idea that the fine-tuning can measure effects of some missing mechanism, we impose non-universal gaugino masses at the GUT scale, and explore the low scale implications. We realize that the fine-tuning parametrized with EW can be as low as zero. We consider the stop mass with a special importance and focus on the mass scales as mt ≤ 700 GeV, which are excluded by the current experiments when the stop decays into a neutralino along with a top quark or a chargino along with a bottom quark. We find that the stop mass can be as low as about 250 GeV with EW ∼ 50. We find that the solutions in this region can be exluded only up to 60% when stop decays into a neutralino-top quark, and 50% when it decays into a chargino-b quark. Setting 65% CL to be potential exclusion and 95% to be pure exclusion limit such solutions will be tested in near future experiments, which are conducted with higher luminosity. In addition to stop, the region with low fine-tuning and light stops predicts masses for the other supersymmetric particles such as mb 700 GeV, mτ 1 TeV, mχ± 1 120 GeV. The details for the mass scales and decay rates are also provided by tables of benchmark points.

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“…In this section we consider NUGM models based on SUSY breaking by a comparable admixture of singlet and nonsinglet superfields. The resulting LSP dark matter is a mixed bino-higgsino state for the 1+75 model and a triply mixed bino-wino-higgsino state for the 1+200 model [36]. These are examples of the well-tempered neutralino scenario [4], mentioned in the introduction.…”

Section: Mixed Gaugino-higgsino Dm In the 1+75 And 1+200 Modelsmentioning

confidence: 91%

SUSY dark matter in universal and nonuniversal gaugino mass models

Roy

2017

Indian J Phys

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We review the phenomenology of SUSY dark matter in various versions of MSSM, with universal and nonuniversal gaugino masses at the GUT scale. We start with the universal case (CMSSM), where the cosmologically compatible dark matter relic density is achieved only over some narrow regions of parameter space, involving some fine-tuning. Moreover, most of these regions are seriously challenged by the constraints from collider and direct dark matter detection experiments. Then we consider some simple and predictive nonuniversal gaugino mass models, based on SU(5) GUT. Several of these models offer viable SUSY dark matter candidates, which are compatible with the cosmic dark matter relic density and the above mentioned experimental constraints. They can be probed at the present and future collider and dark matter search experiments. Finally, we consider the nonuniversal gaugino mass model arising from anomaly mediated SUSY breaking. In this case the cosmologically compatible dark matter relic density requires dark matter mass of a few TeV, which puts it beyond the scope of collider and direct dark matter detection experiments. However, it has interesting predictions for some indirect dark matter detection experiments.

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Mixed neutralino dark matter in nonuniversal gaugino mass models

Cited by 43 publications

References 74 publications

Nonuniversal gaugino masses from nonsingletF-terms in nonminimal unified models

Nonuniversal gaugino masses from nonsingletF-terms in nonminimal unified models

Light stops and fine-tuning in MSSM

SUSY dark matter in universal and nonuniversal gaugino mass models

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