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Chattopadhyay, Utpal; Nath, Pran

doi:10.1103/physrevd.65.075009

Cited by 104 publications

(119 citation statements)

References 89 publications

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“…(3.3). This is consistent with the expected result of Br(B → X s γ) for µA t < 0 [98,[117][118][119][120][121][122]. Similarly a large amount of parameter zone of the same quadrant is eliminated via Br(B s → µ + µ − ) which becomes sensitive for large tan β [117][118][119], in spite of the fact that the pseudoscalar Higgs mass is quite large.…”

Section: Scan Over Wide Range Of µ and A T For Tan β = 40supporting

confidence: 78%

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

Chattopadhyay

Dey

2014

J. High Energ. Phys.

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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.

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Section: Scan Over Wide Range Of µ and A T For Tan β = 40supporting

confidence: 78%

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

Chattopadhyay

Dey

2014

J. High Energ. Phys.

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“…Models with µ < 0 may be consistent with the constraints on BR(b → sγ) and (g − 2) µ only if M 2 is negative [11]. This observation 1 was recently used in [14] where topbottom-tau Yukawa unification was considered in the context of supersymmetric SU(4) c × SU(2) L × SU(2) R .…”

Section: Jhep08(2011)147mentioning

confidence: 89%

Yukawa unification in SO(10) with light sparticle spectrum

Badziak

Olechowski

Pokorski

2011

J. High Energ. Phys.

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We investigate supersymmetric SO(10) GUT model with µ < 0. The requirements of top-bottom-tau Yukawa unification, correct radiative electroweak symmetry breaking and agreement with the present experimental data may be met when the soft masses of scalars and gauginos are non-universal. We show how appropriate nonuniversalities can easily be obtained in the SO(10) GUT broken to the Standard Model. We discuss how values of BR(b → sγ) and (g − 2) µ simultaneously in a good agreement with the experimental data can be achieved in SO(10) model with µ < 0. In the region of the parameter space preferred by our analysis there are two main mechanisms leading to the LSP relic abundance consistent with the WMAP results. One is the co-annihilation with the stau and the second is the resonant annihilation via exchange of the Z boson or the light Higgs scalar. A very interesting feature of SO(10) models with negative µ is that they predict relatively light sparticle spectra. Even the heaviest superpartners may easily have masses below 1.5 TeV in contrast to multi-TeV particles typical for models with positive µ.

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“…The resulting ratios of M G i 's for each n are listed in Table 1. These nonuniversal gaugino mass models are known to be consistent with the observed universality of the gauge couplings at the GUT scale [10][11][12][13] …”

Section: Non-universal Gaugino Mass Modelmentioning

confidence: 78%

Higgsino dark matter in a supergravity model with nonuniversal gaugino masses

2003

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We study a specific SUGRA model with nonuniversal gaugino masses as an alternative to the minimal SUGRA model in the context of supersymmetric dark matter. The lightest supersymmetric particle in this model comes out to be a Higgsino dominated instead of a bino dominated lightest neutralino. The thermal relic density of this Higgsino dark matter is somewhat lower than the cosmologically favoured range, which means it may be only a subdominant component of the cold dark matter. Nonetheless, it predicts favourable rates of indirect detection, which can be seen in square-km size neutrino telescopes.

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b−τunification,gμ−2,the

Cited by 104 publications

References 89 publications

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

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

Yukawa unification in SO(10) with light sparticle spectrum

Higgsino dark matter in a supergravity model with nonuniversal gaugino masses

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