Supersymmetric top and bottom squark production at hadron colliders

Beenakker, W.; Brensing, Silja; Krämer, M.; Kulesza, Anna; Laenen, Eric; Niessen, Irene

doi:10.1007/jhep08(2010)098

Cited by 240 publications

(267 citation statements)

References 60 publications

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“…The SUSY signal samples were produced at leading order using MadGraph5 [50,164,165] with a CTEQ6L1 PDF, with the cross section rescaled using a K-factor calculated with next-to-leading order (NLO) supersymmetric QCD corrections and the resummation of soft gluon emission at next-to-leading-logarithmic (NLL) accuracy using the NLL-fast computer program [166][167][168]. In view of the fact that for large ∆m, the veto of any event with a fourth jet with p T > 30…”

Section: Discussionmentioning

confidence: 99%

Beyond Standard Model Collider Phenomenology of Higgs Physics and Supersymmetry

Thomas¹

2016

Springer Theses

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In this thesis I study the collider phenomenology of BSM physics at the LHC, concentrating on the Higgs boson and supersymmetery. The implications and effects on cross sections of the loss of unitarity in scattering processes involving multiple vector bosons and/or the Higgs, when the Higgs couplings to the W and the Z are non-SM, is studied using an effective Lagrangian. Subsequently methods to remove unwanted background from transversely polarised vector bosons are explored, which enable an estimation of the potential to measure the Higgs couplings to weak bosons in a model-independent way via vector boson fusion. MSSM effects on Higgs production and decay are also considered, concentrating on the effects due to light stops, sbottoms and staus. Amongst other things, we find that light 3 rd generation squarks generally produce asymmetrical alteration in signal strengths of different production channels, generally causing µ V BF µ ggF > 1. Finally we extend some ATLAS analyses in the low ∆m = mt − mχ0 1 region, extending the excluded masses of light stops. This enables us to limit the maximum effects of light stops on the Higgs, and further limits the parameter space where the light stop scenario of electroweak baryogenesis is viable.

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Section: Discussionmentioning

confidence: 99%

Beyond Standard Model Collider Phenomenology of Higgs Physics and Supersymmetry

Thomas¹

2016

Springer Theses

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“…In all cases, the mass of the top quark is fixed at 172.5 GeV. Signal cross-sections are calculated to NLO in the strong coupling constant, adding the resummation of soft-gluon emission at next-to-leading-logarithmic accuracy (NLO+NLL) [45,65,66]. The nominal cross-section and the uncertainty are based on predictions using different PDF sets and factorisation and renormalisation scales, as described in ref.…”

Section: Jhep08(2017)006mentioning

confidence: 99%

Search for direct top squark pair production in events with a Higgs or Z boson, and missing transverse momentum in s = 13 $$ \sqrt{s}=13 $$ TeV pp collisions with the ATLAS detector

Aaboud¹,

Aad²,

Abbott³

et al. 2017

J. High Energ. Phys.

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A search for direct top squark pair production resulting in events with either a same-flavour opposite-sign dilepton pair with invariant mass compatible with a Z boson or a pair of jets compatible with a Standard Model (SM) Higgs boson (h) is presented. Requirements on the missing transverse momentum, together with additional selections on leptons, jets, jets identified as originating from b-quarks are imposed to target the other decay products of the top squark pair. The analysis is performed using proton-proton collision data at √ s = 13 TeV collected with the ATLAS detector at the LHC in 2015-2016, corresponding to an integrated luminosity of 36.1 fb −1 . No excess is observed in the data with respect to the SM predictions. The results are interpreted in two sets of models. In the first set, direct production of pairs of lighter top squarks (t 1 ) with long decay chains involving Z or Higgs bosons is considered. The second set includes direct pair production of the heavier top squark pairs (t 2 ) decaying viat 2 → Zt 1 ort 2 → ht 1 . The results exclude at 95% confidence levelt 2 andt 1 masses up to about 800 GeV, extending the exclusion region of supersymmetric parameter space covered by previous LHC searches.

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“…We also consider the case where a jet is replaced by heavy flavor quark. In each figure we show the current limit on the pair-production cross section times BR 2 , normalized to the NLO+NLL cross section of a scalar colored triplet taken from [20][21][22]. Presented this way, when a single mode dominates the decay (namely BR = 1), the y axis corresponds to the number of copies of the X representation that are experimentally allowed.…”

Section: Jhep02(2017)104mentioning

confidence: 99%

Exotic colored scalars at the LHC

Blum

Efrati

Frugiuele

et al. 2017

J. High Energ. Phys.

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Abstract:We study the phenomenology of exotic color-triplet scalar particles X with charge |Q| = 2/3, 4/3, 5/3, 7/3, 8/3 and 10/3. If X is an SU(2) W -non-singlet, mass splitting within the multiplet allows for cascade decays of the members into the lightest state. We study examples where the lightest state, in turn, decays into a three-body W ± jj final state, and show that in such case the entire multiplet is compatible with indirect precision tests and with direct collider searches for continuum pair production of X down to m X ∼ 250 GeV. However, bound states S, made of XX † pairs at m S ≈ 2m X , form under rather generic conditions and their decay to diphoton can be the first discovery channel of the model. Furthermore, for SU(2) W -non-singlets, the mode S → W + W − may be observable and the width of S → γγ and S → jj may appear large as a consequence of mass splittings within the X-multiplet. As an example we study in detail the case of an SU(2) W -quartet, finding that m X 450 GeV is allowed by all current searches.

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Supersymmetric top and bottom squark production at hadron colliders

Cited by 240 publications

References 60 publications

Beyond Standard Model Collider Phenomenology of Higgs Physics and Supersymmetry

Beyond Standard Model Collider Phenomenology of Higgs Physics and Supersymmetry

Search for direct top squark pair production in events with a Higgs or Z boson, and missing transverse momentum in s = 13 $$ \sqrt{s}=13 $$ TeV pp collisions with the ATLAS detector

Exotic colored scalars at the LHC

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