Stop production at hadron colliders

Beenakker, W.; Krämer, M.; Plehn, Tilman; Spira, M.; Zerwas, P.M.

doi:10.1016/s0550-3213(98)00014-5

Cited by 464 publications

(527 citation statements)

References 21 publications

Supporting

Mentioning

520

Contrasting

Order By: Relevance

“…For the SM backgrounds, we use the Pythia-PGS package in MadGraph to do showering and MLM matching. We do The NLO cross section of stop pair production at the 8 TeV and 14 TeV LHC generated by Prospino2 [18].…”

mentioning

confidence: 99%

Multipleb-jets reveal top superpartners and the 125 GeV Higgs

2013

View full text Add to dashboard Cite

We demonstrate that in supersymmetry (SUSY) with relatively light top superpartners, h → b b can be a very promising channel to discover the SM-like Higgs resonance at the Large Hadron Collider (LHC), although in general contexts it is thought to be challenging because of its huge QCD background. In this scenario, the SM-like Higgs boson is mainly produced via cascade decays initiated by pair-produced stop or sbottom squarks. The good sensitivity to h → b b owes a great deal to the application of multiple (≥ 4) b-jet tagging in removing the QCD background, and color-flow variables for reconstructing the Higgs resonance. We show in two benchmark points that a SM-like Higgs resonance can be discovered at the 14 TeV LHC (with a signal-to-background ratio as high as 0.35), with ∼ 40 fb −1 of data. Potentially, this strategy can be also applied to non-SUSY theories with cascade decays of top partners for the SM-like Higgs search, such as little Higgs, composite Higgs, and Randall-Sundrum models.

show abstract

mentioning

confidence: 99%

Multipleb-jets reveal top superpartners and the 125 GeV Higgs

2013

View full text Add to dashboard Cite

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

“…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.

View full text Add to dashboard Cite

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.

show abstract

Stop production at hadron colliders

Cited by 464 publications

References 21 publications

Multipleb-jets reveal top superpartners and the 125 GeV Higgs

Multipleb-jets reveal top superpartners and the 125 GeV Higgs

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

Contact Info

Product

Resources

About