Squark and Gluino Hadroproduction

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

doi:10.1142/s0217751x11053560

Cited by 349 publications

(380 citation statements)

References 52 publications

Supporting

Mentioning

373

Contrasting

Unclassified

Order By: Relevance

“…Only the first two generations of squarks are considered, and they are assumed to be degenerate in mass. Signal cross sections are calculated to next-to-leading order in the strong coupling constant including the resummation of soft gluon emission at nextto-leading-logarithm accuracy when available [46][47][48][49][50]. The nominal cross section and its uncertainty are taken from an envelope of cross-section predictions using different PDF sets and factorization and renormalization scales, as described in Ref.…”

Section: Monte Carlo Simulation Samplesmentioning

confidence: 99%

Search for new phenomena in events with a photon and missing transverse momentum inppcollisions ats=8 TeVwith the ATLAS detecto

Aad¹,

Abbott²,

Abdallah³

et al. 2015

Phys. Rev. D

View full text Add to dashboard Cite

Results of a search for new phenomena in events with an energetic photon and large missing transverse momentum with the ATLAS experiment at the LHC are reported. Data were collected in proton-proton collisions at a center-of-mass energy of 8 TeV and correspond to an integrated luminosity of 20.3 fb −1 . The observed data are well described by the expected Standard Model backgrounds. The expected (observed) upper limit on the fiducial cross section for the production of events with a photon and large missing transverse momentum is 6.1 (5.3) fb at 95% confidence level. Exclusion limits are presented on models of new phenomena with large extra spatial dimensions, supersymmetric quarks, and direct pair production of dark-matter candidates.

show abstract

Section: Monte Carlo Simulation Samplesmentioning

confidence: 99%

Search for new phenomena in events with a photon and missing transverse momentum inppcollisions ats=8 TeVwith the ATLAS detecto

Aad¹,

Abbott²,

Abdallah³

et al. 2015

Phys. Rev. D

View full text Add to dashboard Cite

show abstract

“…The inclusion of the resummation of soft gluon emission at next-to-leading-logarithmic (NLL) accuracy (NLO þ NLL) [49][50][51][52][53] is performed in the case of strong sparticle pair production. For neutralino, chargino, slepton and sneutrino production, the NLO cross sections used are in agreement with the NLO þ NLL calculation within ∼2% [54][55][56].…”

Section: Monte Carlo Simulationsmentioning

confidence: 99%

Search for supersymmetry in events with four or more leptons ins=8 TeVppcollisions with the ATLAS detector

et al. 2014

View full text Add to dashboard Cite

Results from a search for supersymmetry in events with four or more leptons including electrons, muons and taus are presented. The analysis uses a data sample corresponding to 20.3 fb −1 of proton-proton collisions delivered by the Large Hadron Collider at ffiffi ffi s p ¼ 8 TeV and recorded by the ATLAS detector.Signal regions are designed to target supersymmetric scenarios that can be either enriched in or depleted of events involving the production of a Z boson. No significant deviations are observed in data from standard model predictions and results are used to set upper limits on the event yields from processes beyond the standard model. Exclusion limits at the 95% confidence level on the masses of relevant supersymmetric particles are obtained. In R-parity-violating simplified models with decays of the lightest supersymmetric particle to electrons and muons, limits of 1350 and 750 GeV are placed on gluino and chargino masses, respectively. In R-parity-conserving simplified models with heavy neutralinos decaying to a massless lightest supersymmetric particle, heavy neutralino masses up to 620 GeV are excluded. Limits are also placed on other supersymmetric scenarios.

show abstract

“…to next-to-leading order in the strong coupling constant α S , including the resummation of soft gluon emission at next-to-leading-logarithmic accuracy (NLO+NLL) [50][51][52][53][54]. For each process, the nominal cross section and its uncertainty are taken from an envelope of cross-section predictions using different PDF sets and factorisation and renormalisation scales, as described in ref.…”

Section: Jhep10(2013)130mentioning

confidence: 99%

Search for new phenomena in final states with large jet multiplicities and missing transverse momentum at $ \sqrt{s}=8 $ TeV proton-proton collisions using the ATLAS experiment

Aad

Abajyan

Abbott

et al. 2013

J. High Energ. Phys.

View full text Add to dashboard Cite

A search is presented for new particles decaying to large numbers (7 or more) of jets, with missing transverse momentum and no isolated electrons or muons. This analysis uses 20.3 fb −1 of pp collision data at √ s = 8 TeV collected by the ATLAS experiment at the Large Hadron Collider. The sensitivity of the search is enhanced by considering the number of b-tagged jets and the scalar sum of masses of large-radius jets in an event. No evidence is found for physics beyond the Standard Model. The results are interpreted in the context of various simplified supersymmetry-inspired models where gluinos are pair produced, as well as an mSUGRA/CMSSM model. The ATLAS collaboration 34 IntroductionMany extensions of the Standard Model of particle physics predict the presence of TeVscale strongly interacting particles that decay to weakly interacting descendants. In the context of R-parity-conserving supersymmetry (SUSY) [1][2][3][4][5], the strongly interacting parent particles are the partners of the quarks (squarks,q) and gluons (gluinos,g), and are produced in pairs. The lightest supersymmetric particle (LSP) is stable, providing a candidate that can contribute to the relic dark-matter density in the universe [6,7]. If they are kinematically accessible, the squarks and gluinos could be produced in the proton-proton interactions at the Large Hadron Collider (LHC) [8].-1 - JHEP10(2013)130Such particles are expected to decay in cascades, the nature of which depends on the mass hierarchy within the model. The events would be characterised by significant missing transverse momentum from the unobserved weakly interacting descendants, and by a large number of jets from emissions of quarks and/or gluons. Individual cascade decays may include gluino decays to a top squark (stop,t) and an anti-top quark, g →t +t (1.1a)followed by the top-squark decay to a top quark and a neutralino LSP,χ 0 1 , t → t +χ 0 1.(1.1b)Alternatively, if the top squark is heavier than the gluino, the three-body decay, g → t +t +χ 0 1 (1.2) may result. Other possibilities include decays involving intermediate charginos, neutralinos, and/or squarks including bottom squarks. A pair of cascade decays produces a large number of Standard Model particles, together with a pair of LSPs, one from the end of each cascade. The LSPs are assumed to be stable and only weakly interacting, and so escape undetected, resulting in missing transverse momentum. In this paper we consider final states with large numbers of jets together with significant missing transverse momentum in the absence of isolated electrons or muons, using the pp collision data recorded by the ATLAS experiment [9] during 2012 at a centre-of-mass energy of √ s = 8 TeV. The corresponding integrated luminosity is 20.3 fb −1 . Searches for new phenomena in final states with large jet multiplicities -requiring from at least six to at least nine jets -and missing transverse momentum have previously been reported by the ATLAS Collaboration using LHC pp collision data corresponding to 1.34 fb −1 [10]...

show abstract

Squark and Gluino Hadroproduction

Cited by 349 publications

References 52 publications

Search for new phenomena in events with a photon and missing transverse momentum inppcollisions ats=8 TeVwith the ATLAS detecto

Search for new phenomena in events with a photon and missing transverse momentum inppcollisions ats=8 TeVwith the ATLAS detecto

Search for supersymmetry in events with four or more leptons ins=8 TeVppcollisions with the ATLAS detector

Search for new phenomena in final states with large jet multiplicities and missing transverse momentum at $ \sqrt{s}=8 $ TeV proton-proton collisions using the ATLAS experiment

Contact Info

Product

Resources

About