Probing light higgsinos in natural SUSY from monojet signals at the LHC

138

146

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.

Section: Jhep03(2014)060mentioning

confidence: 99%

Section: Tev Projectionmentioning

confidence: 99%

Compressed electroweakino spectra at the LHC

Schwaller

Zurita

2014

138

146

“…The new physics that affects the Higgs couplings has been cornered to a decoupling region [3,4]. Besides, since many extensions of the SM (like the supersymmetric models) contain a SM-like Higgs boson [5][6][7][8][9][10][11][12][13][14][15][16][17] whose properties can be quite similar to the SM Higgs boson, it is difficult for the LHC to verify whether or not this new boson is the SM one. In order to precisely study this newly discovered Higgs boson, an e + e − collider, the so-called Higgs factory, is needed.…”

Section: Introductionmentioning

confidence: 99%

Full one-loop electroweak corrections to e + e − → ZHγ at a Higgs factory

Liu

Ren

et al. 2014

Self Cite

Motivated by the future precision test of the Higgs boson at an e + e − Higgs factory, we calculate the production e + e − → ZHγ in the Standard Model with complete next-to-leading order electroweak corrections. We find that for √ s = 240 (350) GeV the cross section of this production is sizably reduced by the electroweak corrections, which is 1.03 (5.32) fb at leading order and 0.72 (4.79) fb at next-to-leading order. The transverse momentum distribution of the photon in the final states is also presented.

“…Such a higgsino LSP scenario may be probed at the high luminosity LHC [51][52][53][54][55]. 13,14 , N 22,23,24 ∼ 0, and N 12,21 ∼ 1.…”

Section: Introductionmentioning

confidence: 99%

Leptonic mono-top from single stop production at the LHC

Duan¹,

Hikasa²,

Wu³

et al. 2017

Self Cite

Top squark (stop) can be produced via QCD interaction but also the electroweak interaction at the LHC. In this paper, we investigate the observability of the associated production of stop and chargino, pp →t 1χ − 1 , in compressed electroweakino scenarios at 14 TeV LHC. Due to small mass splitting between the lightest neutralino (χ 0 1 ) and chargino (χ − 1 ), the single stop production can give the mono-top signature through the stop decayt 1 → tχ 0 1 . We analyze the leptonic mono-top channel of the single stop production and propose a lab-frame observable cos θ b to reduce the SM backgrounds. We find that such leptonic mono-top events from the single stop production can be probed at 2σ level at the HL-LHC if mt 1 < 760 GeV and mχ0 1 < 150 GeV. Given a discovery of the stop and a measurement of the single stop production cross section, the stop mixing angle can also be determined from the single stop production at the HL-LHC.