Impact of LHC searches on NLSP top squark and gluino mass

He, Bin; Li, Tong; Shafi, Qaisar

doi:10.1007/jhep05(2012)148

Cited by 33 publications

(19 citation statements)

References 59 publications

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“…In figure 12 we illustrate the current limits on a light stop that decays viat 1 → cχ 0 1 based on data from the Tevatron and the LHC. Instead, some sensitivity can be recovered through monojet searches, requiring a single hard jet and missing energy [181][182][183][184], as can also be seen in figure 12, although a full test of the parameter space will be challenging [185]. A potential further probe may be provided by the decays of stoponium, a bound state consisting of a stop and its anti-particle [186][187][188][189].…”

Section: The High Energy Frontier: Cp-violation and Phase Transitionsmentioning

confidence: 99%

Electroweak baryogenesis

2012

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Abstract. Electroweak baryogenesis (EWBG) remains a theoretically attractive and experimentally testable scenario for explaining the cosmic baryon asymmetry. We review recent progress in computations of the baryon asymmetry within this framework and discuss their phenomenological consequences. We pay particular attention to methods for analyzing the electroweak phase transition and calculating CP-violating asymmetries, the development of Standard Model extensions that may provide the necessary ingredients for EWBG, and searches for corresponding signatures at the high energy, intensity and cosmological frontiers.

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Section: The High Energy Frontier: Cp-violation and Phase Transitionsmentioning

confidence: 99%

Electroweak baryogenesis

2012

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“…The possibility to search and constrain dark matter models using this signature has been suggested in [40][41][42] and has been successfully employed to constrain effective dark matter models by the ATLAS and CMS collaborations [43][44][45][46]. The importance of ISR radiation for SUSY searches has also been emphasised and exploited, for electroweakino production at the Tevatron [47], and in [48][49][50][51][52][53][54][55][56][57][58][59][60] in the context of strong SUSY production. A first application to direct electroweak production of Higgsinos has also appeared recently [61].…”

Section: Jhep03(2014)060mentioning

confidence: 99%

Compressed electroweakino spectra at the LHC

Schwaller

Zurita

2014

J. High Energ. Phys.

137

146

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In this work, we examine the sensitivity of monojet searches at the LHC to directly produced charginos and neutralinos (electroweakinos) in the limit of small mass splitting, where the traditional multilepton plus missing energy searches loose their sensitivity. We first recast the existing 8 TeV monojet search at CMS in terms of a SUSY simplified model with only light gauginos (winos and binos) or only light Higgsinos. The current searches are not sensitive to MSSM-like production cross sections, but would be sensitive to models with 2-20 times enhanced production cross section, for particle masses between 100 GeV and 250 GeV. Then we explore the sensitivity in the 14 TeV run of the LHC. Here we emphasise that in addition to the pure monojet search, soft leptons present in the samples can be used to increase the sensitivity. Exclusion of electroweakino masses up to 200 GeV is possible with 300 fb −1 at the LHC, if the systematic error can be reduced to the 1% level. Discovery is possible with 3000 fb −1 in some regions of parameter space.

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“…We also assume that the mass difference between the stop and the LSP is substantially larger than the top quark mass. Otherwise the signal will strongly overlap with the SM backgrounds, which would need some different search strategies [20][21][22][23][24].…”

Section: Jhep07(2012)110mentioning

confidence: 99%

Stop the top background of the stop search

Bai

Cheng

Gallicchio

et al. 2012

J. High Energ. Phys.

113

110

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Abstract:The main background for the supersymmetric stop direct production search comes from Standard Model tt events. For the single-lepton search channel, we introduce a few kinematic variables to further suppress this background by focusing on its dileptonic and semileptonic topologies. All are defined to have end points in the background, but not signal distributions. They can substantially improve the stop signal significance and mass reach when combined with traditional kinematic variables such as the total missing transverse energy. Among them, our variable M W T 2 has the best overall performance because it uses all available kinematic information, including the on-shell mass of both W 's. We see 20%-30% improvement on the discovery significance and estimate that the 8 TeV LHC run with 20 fb −1 of data would be able to reach an exclusion limit of 650-700 GeV for direct stop production, as long as the stop decays dominantly to the top quark and a light stable neutralino. Most of the mass range required for the supersymmetric solution of the naturalness problem in the standard scenario can be covered.

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Impact of LHC searches on NLSP top squark and gluino mass

Cited by 33 publications

References 59 publications

Electroweak baryogenesis

Electroweak baryogenesis

Compressed electroweakino spectra at the LHC

Stop the top background of the stop search

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