Collider signatures of gravitino dark matter with a sneutrino NLSP

Covi, Laura; Kraml, S.

doi:10.1088/1126-6708/2007/08/015

Cited by 43 publications

(69 citation statements)

References 58 publications

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“…[63]. For the mSUGRA/CMSSM [64][65][66][67][68][69] and non-universal Higgs mass model with gaugino mediation (NUHMG) [70] samples the SUSY particle mass spectra and decay tables are calculated with SUSY-HIT [71] interfaced to the SOFTSUSY spectrum generator [72] and SDECAY [73].…”

Section: Monte Carlo Data Samplesmentioning

confidence: 99%

Search for squarks and gluinos with the ATLAS detector in final states with jets and missing transverse momentum using s = 8 $$ \sqrt{s}=8 $$ TeV proton-proton collision data

Aad

Abbott

Abdallah

et al. 2014

J. High Energ. Phys.

270

377

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A search for squarks and gluinos in final states containing high-p T jets, missing transverse momentum and no electrons or muons is presented. The data were recorded in 2012 by the ATLAS experiment in √ s = 8 TeV proton-proton collisions at the Large Hadron Collider, with a total integrated luminosity of 20.3 fb −1 . Results are interpreted in a variety of simplified and specific supersymmetry-breaking models assuming that R-parity is conserved and that the lightest neutralino is the lightest supersymmetric particle. An exclusion limit at the 95% confidence level on the mass of the gluino is set at 1330 GeV for a simplified model incorporating only a gluino and the lightest neutralino. For a simplified model involving the strong production of first-and second-generation squarks, squark masses below 850 GeV (440 GeV) are excluded for a massless lightest neutralino, assuming mass degenerate (single light-flavour) squarks. In mSUGRA/CMSSM models with tan β = 30, A 0 = −2m 0 and µ > 0, squarks and gluinos of equal mass are excluded for masses below 1700 GeV. Additional limits are set for non-universal Higgs mass models with gaugino mediation and for simplified models involving the pair production of gluinos, each decaying to a top squark and a top quark, with the top squark decaying to a charm quark and a neutralino. These limits extend the region of supersymmetric parameter space excluded by previous searches with the ATLAS detector.

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Section: Monte Carlo Data Samplesmentioning

confidence: 99%

Search for squarks and gluinos with the ATLAS detector in final states with jets and missing transverse momentum using s = 8 $$ \sqrt{s}=8 $$ TeV proton-proton collision data

Aad

Abbott

Abdallah

et al. 2014

J. High Energ. Phys.

270

377

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“…In these models, the LSP is always the lightest neutralino. The phenomenological models include scenarios for minimal super-gravity-mediated SUSY breaking (mSUGRA/CMSSM) [35][36][37][38][39][40], bilinear R-parity violation (bRPV) [41], natural gauge mediation (nGM) [42] and a non-universal Higgs-boson mass with gaugino mediation (NUHMG) [43].1 The nominal pp interaction point at the centre of the detector is defined as the origin of a right-handed coordinate system. The positive x-axis is defined by the direction from the interaction point to the centre of the LHC ring, with the positive y-axis pointing upwards, while the beam direction defines the z-axis.…”

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confidence: 99%

“…These parameters are set as follows: tan β = 10, µ > 0, m 2 H 2 = 0; m 1/2 and m 2 H 1 are chosen such that the NLSP is a tau-sneutrino with properties satisfying Big Bang Nucleosynthesis constraints (see ref. [43]); A 0 is chosen to maximise the mass of the lightest Higgs boson (in NUHMG models, the Higgs boson mass obtained is usually lower than the measured value: varying A 0 allows the models considered here to minimise this difference to the level of a few GeV). In this model, there is a significant production of gluinos and squarks throughout the parameter space studied.…”

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confidence: 99%

Search for squarks and gluinos in events with isolated leptons, jets and missing transverse momentum at s = 8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector

Aad¹,

Kupčo²,

Davison³

et al. 2015

J. High Energ. Phys.

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Abstract:The results of a search for supersymmetry in final states containing at least one isolated lepton (electron or muon), jets and large missing transverse momentum with the ATLAS detector at the Large Hadron Collider are reported. The search is based on proton-proton collision data at a centre-of-mass energy √ s = 8 TeV collected in 2012, corresponding to an integrated luminosity of 20 fb −1 . No significant excess above the Standard Model expectation is observed. Limits are set on supersymmetric particle masses for various supersymmetric models. Depending on the model, the search excludes gluino masses up to 1.32 TeV and squark masses up to 840 GeV. Limits are also set on the parameters of a minimal universal extra dimension model, excluding a compactification radius of 1/R c = 950 GeV for a cut-off scale times radius (ΛR c ) of approximately 30. Keywords: Hadron-Hadron Scattering JHEP04(2015)116The ATLAS collaboration 58 IntroductionSupersymmetry (SUSY) [1][2][3][4][5][6][7][8][9] postulates the existence of particles (sparticles) which differ by half a unit of spin from their Standard Model (SM) partners. The squarks (q L andq R ) and sleptons (˜ L and˜ R ) are the scalar partners of the left-handed and right-handed quarks and leptons, the gluinos (g) are the fermionic partners of the gluons, and the charginos (χ ± i with i = 1, 2) and neutralinos (χ 0 i with i = 1, 2, 3, 4) are the mass eigenstates (ordered from the lightest to the heaviest) formed from the linear superpositions of the SUSY partners of the Higgs and electroweak gauge bosons. An attractive feature of SUSY is that it can solve the SM hierarchy problem [10][11][12][13][14][15] if the gluino, higgsino and top squark masses are not much higher than the TeV scale.If strongly interacting sparticles exist at the TeV scale, they should be accessible at the Large Hadron Collider (LHC). In the minimal supersymmetric extension of the SM such particles decay into jets, possibly leptons, and the lightest sparticle (LSP). If the LSP is stable owing to R-parity conservation [15][16][17][18][19] and only weakly interacting, it escapes detection, leading to missing transverse momentum (p miss T and its magnitude E miss T ) in the final state. In this scenario, the LSP can be a dark-matter candidate. Significant E miss T can also arise in R-parity-violating scenarios in which the LSP decays to final states containing neutrinos or in scenarios where neutrinos are present in the cascade decay chains of the produced sparticles.This paper presents a search with the ATLAS detector [20,21] for SUSY in final states containing jets, at least one isolated lepton (electron or muon) and large E miss T . Different search channels are used in order to cover a broad parameter space: the events are selected by different requirements on the transverse momentum (p T ) of the leptons, either using low-p T leptons (referred to as the "soft" lepton selection), or high-p T leptons (referred to as the "hard" lepton selection). Each of these categories is further subdivided i...

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“…However, in this case, it is important to distinguish the sneutrino from the neutralino. At collider experiments, the long-lived sneutrino behaves similarly to the LSP (or long-lived NLSP) neutralino, but there are some characteristic signatures [40]. Interestingly, once the sneutrino has been observed as if it were the LSP at collider experiments, the superWIMP scenario would become more plausible as the dark matter scenario.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Gravitino dark matter from increased thermal relic particles

Okada

Seto

2008

Phys. Rev. D

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We investigate the so-called superWIMP scenario with gravitino as the lightest supersymmetric particle (LSP) in the context of non-standard cosmology, in particular, brane world cosmology. As a candidate of the next-to-LSP (NLSP), we examine slepton and sneutrino. Brane world cosmological effects dramatically enhance the relic density of the slepton or sneutrino NLSP, so that the NLSP with mass of order 100 GeV can provide the correct abundance of gravitino dark matter through its decay. We find that with an appropriate five dimensional Planck mass, this scenario can be realized consistently with the constraints from Big Bang Nucleosynthesis (BBN) for both NLSP candidates of slepton and sneutrino. The BBN constraints for slepton NLSP are more stringent than that for sneutrino, as the result, the gravitino must be rather warm in the slepton NLSP case.The energy density of gravitino produced by thermal scattering is highly suppressed and negligible due to the brane world cosmological effects.

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Collider signatures of gravitino dark matter with a sneutrino NLSP

Cited by 43 publications

References 58 publications

Search for squarks and gluinos with the ATLAS detector in final states with jets and missing transverse momentum using s = 8 $$ \sqrt{s}=8 $$ TeV proton-proton collision data

Search for squarks and gluinos with the ATLAS detector in final states with jets and missing transverse momentum using s = 8 $$ \sqrt{s}=8 $$ TeV proton-proton collision data

Search for squarks and gluinos in events with isolated leptons, jets and missing transverse momentum at s = 8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector

Gravitino dark matter from increased thermal relic particles

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