A realistic intersecting D6-brane model after the first LHC run

Li, Tianjun; Nanopoulos, Dimitri V.; Raza, Shabbar; Wang, Xiaochuan

doi:10.1007/jhep08(2014)128

Cited by 18 publications

(19 citation statements)

References 168 publications

(239 reference statements)

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“…In this case, the relic abundance of LSP should also be consistent with the current results from the WMAP [48] and Planck [49] satellites. However, even if a solution does not satisfy the dark matter observations, it can still survive in conjunction with other form(s) of the dark matter formation [50,51]. In this case, the lightest neutralino may not be related to the DM phenomenology.…”

Section: Scanning Procedures and Experimental Constraintsmentioning

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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Section: Scanning Procedures and Experimental Constraintsmentioning

confidence: 99%

Light stops and fine-tuning in MSSM

2018

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“…If LSP neutralino is also assumed to saturate the dark matter relic abundance, then one can also apply bounds arising from the dark matter observations. Even though these constraints are also very strong in shaping the fundamental parameter space, solutions excluded by the observations can still provide viable solutions in conjunction with other forms of dark matter [37]. Thus, in our work, we do not require the LSP neutralino to satisfy the WMAP [45] and Planck [46] observations.…”

Section: Scanning Procedures and Experimental Constraintsmentioning

confidence: 98%

“…Another constraint is dark matter observations and it restricts the parameter space which requires the lightest supersymmetric particle (LSP) stable and no electric and color charge, which excludes the regions leading to stau or stop LSP solutions [36]. On the other hand, even if a solution does not satisfy the dark matter observations, it can still survive in conjunction with other form(s) of the dark matter formation [37]. Based on this discussion, we accept only the solutions which yield neutralino LSP at the low scale, but we do not apply any constraint from the dark matter experiments.…”

Section: Scanning Procedures and Experimental Constraintsmentioning

confidence: 99%

Muon g−2 in an alternative quasi-Yukawa unification with a less fine-tuned seesaw mechanism

2018

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We explore the low-scale implications of the Pati-Salam Model including the TeV scale right-handed neutrinos interacting and mixing with the MSSM fields through the inverse seesaw (IS) mechanism in light of the muon anomalous magnetic moment (muon g − 2) resolution and highlight the solutions which are compatible with the quasi-Yukawa unification condition (QYU). We find that the presence of the righthanded neutrinos causes heavy smuons as mμ ≳ 800 GeV in order to avoid tachyonic staus at the low scale. On the other hand, the sneutrinos can be as light as about 100 GeV, and along with the light charginos of mass ≲400 GeV, they can yield such large contributions to muon g − 2 that the discrepancy between the experiment and the theory can be resolved. These solutions also require m˜χAE We also discuss such light chargino and neutralino along with the light stau (mτ ≳ 200 GeV) in the light of current LHC results. Besides, the gluino mass lies in a range ∼½2.5-3.5 TeV, which is tested in near future experiments. In addition, the model predicts relatively light Higgsinos (μ ≲ 700 GeV); hence, the second chargino mass is also light enough (≲700 GeV) to contribute to muon g − 2. Light Higgsinos also yield less fine-tuning at the electroweak scale, and the regions compatible with muon g − 2 restrict Δ EW ≲ 100 strictly, and this region also satisfies the QYU condition. In addition, the ratios among the Yukawa couplings should be 1.8 ≲ y t /y b ≲ 2.6, y τ /y b ∼ 1.3 to yield correct fermion masses. Even though the righthanded neutrino Yukawa coupling can be varied freely, the solutions bound its range to 0.8 ≲ y ν /y b ≲ 1.7.

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“…The thermal relic abundance of LSP should, of course, be consistent with the current results from the WMAP [174] and Planck [175] satellites. However, even if a solution does not satisfy the dark matter observations, it can still survive in conjunction with other form(s) of the dark matter [19,176]. We mostly focus on the LHC allowed solutions, but we also discuss the DM implications in our results.…”

Section: Scanning Procedures and Experimental Constraintsmentioning

confidence: 99%

“…If the dark matter relic density is saturated only by the LSP neutralino, then these points are also excluded by the current WMAP and Planck measurements. However, such solutions can be still available in conjunction with other form(s) of the dark matter [19,176]. In addition to the chargino-neutralino coannihilation scenario, Point 1 in Table 2 represents a solution in which stop is NLSP and nearly degenerate to the LSP neutralino in mass.…”

Section: Probing Stop In Collider Experimentsmentioning

confidence: 99%

Stop search in SUSY SO(10) GUTs with nonuniversal Gaugino masses

et al. 2020

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We explore the stop mass and its possible probe through a set of three different signal processes within a class of SUSY GUTs with non-universal gaugino masses. The stop mass can be realized in a wide range (0.4-8 TeV) consistent with the current experimental constraints. We consider the decay processes;t 1 → tχ 0 1 ,t 1 → bW ±χ 0 1 andt 1 → bqq χ 0 1 to be possible signals, and explore the impact of the current experimental results as well as the possible mass scales of stop, which can be probed in the future collider experiments. We find that the first and third signal processes can be tested in the current experiments, and significantly probed in future, while the second signal process is not available for the current experiments in this class of SUSY GUTs. We also comment that the second signal process can be available to be tested when the collider experiments are conducted at high center of mass energies and luminosity.

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A realistic intersecting D6-brane model after the first LHC run

Cited by 18 publications

References 168 publications

Light stops and fine-tuning in MSSM

Light stops and fine-tuning in MSSM

Muon g−2 in an alternative quasi-Yukawa unification with a less fine-tuned seesaw mechanism

Stop search in SUSY SO(10) GUTs with nonuniversal Gaugino masses

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