Sparticles at the LHC

Feldman, Daniel; Liu, Zuowei; Nath, Pran

doi:10.1088/1126-6708/2008/04/054

Cited by 63 publications

(73 citation statements)

References 134 publications

(132 reference statements)

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“…This is not unexpected given previous studies of sparticle mass hierarchical patterns [14,15,18,49]. As we will demonstrate in what follows, these similarities allow predictions to be made if excesses over SM background are observed at the LHC.…”

Section: Signatures Of the Low Mass Gaugino Models In The Higgs-supporting

confidence: 81%

“…We add here that in general there does exist a large collection of possible models and in particular a large collection of possible sparticle mass hierarchies [14,15,18]. These of course can give rise to different and interesting signatures and several previous works have made progress on discussing how such models may be discriminated against one another [14-16, 18, 18, 49].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, some aspects of the minimal supergravity models where the relics annihilate near the light CP-even Higgs pole have been discussed in Ref. [14][15][16][17][18][19], which fall under the mass hierarchy denoted by mSP4 (supergravity mass pattern 4) [14,15], where, in particular, a clean edge in the dilepton invariant mass in this model class was noted in Ref. [15].…”

Section: Introductionmentioning

confidence: 99%

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Predictive signatures of supersymmetry: Measuring the dark matter mass and gluino mass with early LHC data

et al. 2011

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We present a focused study of a predictive unified model whose measurable consequences are immediately relevant to early discovery prospects of supersymmetry at the LHC. ATLAS and CMS have released their analysis with 35 pb −1 of data and the model class we discuss is consistent with this data. It is shown that with an increase in luminosity the LSP dark matter mass and the gluino mass can be inferred from simple observables such as kinematic edges in leptonic channels and peak values in effective mass distributions. Specifically, we consider cases in which the neutralino is of low mass and where the relic density consistent with WMAP observations arises via the exchange of Higgs bosons in unified supergravity models. The magnitudes of the gaugino masses are sharply limited to focused regions of the parameter space, and in particular the dark matter mass lies in the range ∼ (50 − 65) GeV with an upper bound on the gluino mass of 575 GeV, with a typical mass of 450 GeV. We find that all model points in this paradigm are discoverable at the LHC at √ s = 7 TeV. We determine lower bounds on the entire sparticle spectrum in this model based on existing experimental constraints. In addition, we find the spin-independent cross section for neutralino scattering on nucleons to be generally in the range of σ SĨ χ 0 1 p = 10 −46±1 cm 2 with much higher cross sections also possible. Thus direct detection experiments such as CDMS and XENON already constrain some of the allowed parameter space of the low mass gaugino models and further data will provide important cross-checks of the model assumptions in the near future.

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Section: Signatures Of the Low Mass Gaugino Models In The Higgs-supporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Predictive signatures of supersymmetry: Measuring the dark matter mass and gluino mass with early LHC data

et al. 2011

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“…We display the model points consistent with the general constraints in Fig. 1 [55] . This will be shown in more detail in the next section.…”

Section: Higgs Mass In Minimal Sugrasupporting

confidence: 56%

Higgs boson mass predictions in supergravity unification, recent LHC-7 results, and dark matter

et al. 2012

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LHC-7 has narrowed down the mass range of the light Higgs boson. This result is consistent with the supergravity unification framework, and the current Higgs boson mass window implies a rather significant loop correction to the tree value, pointing to a relatively heavy scalar sparticle spectrum with universal boundary conditions. It is shown that the largest value of the Higgs boson mass is obtained on the Hyperbolic Branch of radiative breaking. The implications of light Higgs boson in the broader mass range of 115 GeV to 131 GeV and a narrower range of 123 GeV to 127 GeV are explored in the context of the discovery of supersymmetry at LHC-7 and for the observation of dark matter in direct detection experiments.

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“…The coannihilation regions contain stau coannihilation [4,5], stop coannihilation, gluino coannihilation [6,7,8], etc. We focus our discussion on the stau coannihilation region (Stau-Co) and the HB region as these two are the more generic and also are the more probable models as suggested by the recent landscape analysis for different hierarchical mass patterns in mSUGRA [9,10,11].…”

Section: Introductionmentioning

confidence: 99%

Decoding the Origin of Dark Matter

Liu¹

2010

AIP Conference Proceedings

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Abstract. We discuss the interplay between LHC signatures and the mechanism by which dark matter is generated in the early universe in supersymmetric theories. The LHC signatures of two of the major mechanisms for such generation of dark matter which are known to be the Stau Coannihilation (Stau-Co) region and annihilation on the Hyperbolic Branch (HB) are exhibited in detail. By analyzing the various LHC signatures, including multi leptons, hadronic jets, b-tagging, and missing transverse momentum, one can discriminate between the Stau-Co region and the HB region for the mSUGRA model. Interestingly, there are some regions of the parameter space which are beyond the current and near future reach of the dark matter direct detection experiments but will be accessible at the LHC, and vise versa.

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Sparticles at the LHC

Cited by 63 publications

References 134 publications

Predictive signatures of supersymmetry: Measuring the dark matter mass and gluino mass with early LHC data

Predictive signatures of supersymmetry: Measuring the dark matter mass and gluino mass with early LHC data

Higgs boson mass predictions in supergravity unification, recent LHC-7 results, and dark matter

Decoding the Origin of Dark Matter

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