A boost for the EW SUSY hunt: monojet-like search for compressed sleptons at LHC14 with 100 fb−1

Barr, A. J.; Scoville, James

doi:10.1007/jhep04(2015)147

Cited by 25 publications

(17 citation statements)

References 44 publications

(71 reference statements)

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“…The m ττ variable [115][116][117] approximates the invariant mass of a leptonically decaying τ-lepton pair if both τ leptons are sufficiently boosted so that the neutrinos from each τ decay are collinear with the visible lepton momentum. It is defined as…”

Section: Signal Regionsmentioning

confidence: 99%

Searches for electroweak production of supersymmetric particles with compressed mass spectra in s=13 TeV pp collisions with

Aad¹,

Abbott²,

Abbott³

et al. 2020

Phys. Rev. D

162

148

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This paper presents results of searches for the electroweak production of supersymmetric particles in models with compressed mass spectra. The searches use 139 fb −1 of ffiffi ffi s p ¼ 13 TeV proton-proton collision data collected by the ATLAS experiment at the Large Hadron Collider. Events with missing transverse momentum and two same-flavor, oppositely charged, low-transverse-momentum leptons are selected, and are further categorized by the presence of hadronic activity from initial-state radiation or a topology compatible with vector-boson fusion processes. The data are found to be consistent with predictions from the Standard Model. The results are interpreted using simplified models of R-parity-conserving supersymmetry in which the lightest supersymmetric partner is a neutralino with a mass similar to the lightest chargino, the second-to-lightest neutralino, or the slepton. Lower limits on the masses of charginos in different simplified models range from 193 to 240 GeV for moderate mass splittings, and extend down to mass splittings of 1.5 to 2.4 GeV at the LEP chargino bounds (92.4 GeV). Similar lower limits on degenerate light-flavor sleptons extend up to masses of 251 GeV and down to mass splittings of 550 MeV. Constraints on vector-boson fusion production of electroweak SUSY states are also presented.

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Section: Signal Regionsmentioning

confidence: 99%

Searches for electroweak production of supersymmetric particles with compressed mass spectra in s=13 TeV pp collisions with

Aad¹,

Abbott²,

Abbott³

et al. 2020

Phys. Rev. D

162

148

View full text Add to dashboard Cite

show abstract

“…12, we show the normalized distribution of the dilepton invariant mass m and the ratio of E miss T /H lep T of the signal and background events. We can find that the signal has more events in the range of the invariant mass m ≤ 30 GeV [86,87], which can highly suppress the γ * /Z ( * ) (→ ) + jets and tt backgrounds. Besides, it can also hurt the fake/non-prompt leptons effectively [88].…”

Section: Wino Coannihilationmentioning

confidence: 89%

On the coverage of neutralino dark matter in coannihilations at the upgraded LHC

Abdughani

2020

Eur. Phys. J. C

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In the supersymmetric models, the coannihilation of the neutralino DM with a lighter supersymmetric particle provides a feasible way to accommodate the observed cosmological DM relic density. Such a mechanism predicts a compressed spectrum of the neutralino DM and its coannihilating partner, which results in the soft final states and makes the searches for sparticles challenging at colliders. On the other hand, the abundance of the freeze-out neutralino DM usually increases as the DM mass becomes heavier. This implies an upper bound on the mass of the neutralino DM. Given these observations, we explore the HE-LHC coverage of the neutralino DM for the coannihilations. By analyzing the events of the multijet with the missing transverse energy (E miss T ), the monojet, the soft lepton pair plus E miss T , and the monojet plus a hadronic tau, we find that the neutralino DM mass can be excluded up to 2.6, 1.7 and 0.8 TeV in the gluino, stop and wino coannihilations at the 2σ level, respectively. However, there is still no sensitivity of the neutralino DM in stau coannihilation at the HE-LHC, due to the small cross section of the direct stau pair production and the low tagging efficiency of soft tau from the stau decay.

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“…Utilizing the information from the SFOS lepton pair and / p T , we can construct the m τ τ variable [88][89][90][91] for reducing the τ + τ − + jets background. When a tau pair recoils against an energetic jet, the taus are highly boosted and their decay products would be nearly parallel.…”

Section: Soft-dilepton + Jets + / E T Channelmentioning

confidence: 99%

Inert sextuplet scalar dark matter at the LHC and future colliders

Liu

Cai

et al. 2020

J. High Energ. Phys.

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We study a dark matter model constructed by extending the standard model with an inert SU(2)L sextuplet scalar of hypercharge 1/2. The sextuplet components are split by the quartic couplings between the sextuplet and the Higgs doublet after electroweak symmetry breaking, resulting in a dark sector with one triply charged, two doubly charged, two singly charged, and two neutral scalars. The lighter neutral scalar boson acts as a dark matter particle. We investigate the constraints on this model from the monojet + "Image missing" and soft-dilepton + jets + "Image missing" searches at the 13 TeV Large Hadron Collider, as well as from the current electroweak precision test. Furthermore, we estimate the projected sensitivities of a 100 TeV pp collider and of a future e+e− collider, and find that such future projects could probe TeV mass scales. Nonetheless, such mass scales only correspond to a subdominant component of the observed relic abundance if the dark matter particles solely originate from thermal production.

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A boost for the EW SUSY hunt: monojet-like search for compressed sleptons at LHC14 with 100 fb−1

Cited by 25 publications

References 44 publications

Searches for electroweak production of supersymmetric particles with compressed mass spectra in s=13 TeV pp collisions with

Searches for electroweak production of supersymmetric particles with compressed mass spectra in s=13 TeV pp collisions with

On the coverage of neutralino dark matter in coannihilations at the upgraded LHC

Inert sextuplet scalar dark matter at the LHC and future colliders

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