Gravitino Dark Matter scenarios with massive metastable charged sparticles at the LHC

Ellis, John; Raklev, Are; Øye, O. K.

doi:10.1088/1126-6708/2006/10/061

Cited by 74 publications

(122 citation statements)

References 46 publications

(65 reference statements)

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“…Being a metastable charged particle, it would have a distinctive experimental signature at the LHC or other colliders. Studies within such a scenario have shown that the mass of theτ 1 could be measured very accurately, and that one could easily reconstruct heavier sparticles that decay into theτ 1 [50]. Alternatively, the NLSP might be the lighter supersymmetric partner of the top quark, denoted byt 1 [51,52,53], which would have even more distinctive signatures at the LHC.…”

Section: Possible Supersymmetric Dark Matter Candidatesmentioning

confidence: 99%

Supersymmetric dark matter candidates

Ellis

Olive²

2010

Particle Dark Matter

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CERN-PH-TH/2010-004, UMN-TH-2831/10, FTPI-MINN-10/02After reviewing the theoretical, phenomenological and experimental motivations for supersymmetric extensions of the Standard Model, we recall that supersymmetric relics from the Big Bang are expected in models that conserve R parity. We then discuss possible supersymmetric dark matter candidates, focusing on the lightest neutralino and the gravitino. In the latter case, the next-to-lightest supersymmetric particle is expected to be long-lived, and possible candidates include spartners of the tau lepton, top quark and neutrino. We then discuss the roles of the renormalization-group equations and electroweak symmetry breaking in delimiting the supersymmetric parameter space. We discuss in particular the constrained minimal extension of the Standard Model (CMSSM), in which the supersymmetry-breaking parameters are assumed to be universal at the grand unification scale, presenting predictions from a frequentist analysis of its parameter space. We also discuss astrophysical and cosmological constraints on gravitino dark matter models, as well as the parameter space of minimal supergravity (mSUGRA) models in which there are extra relations between the trilinear and bilinear supersymmetry-breaking parameters, and between the gravitino and scalar masses. Finally, we discuss models with non-universal supersymmetry-breaking contributions to Higgs masses, and models in which the supersymmetry-breaking parameters are universal at some scale below that of grand unification. From 'Particle Dark Matter: Observations, Models and Searches' edited byGianfranco Bertone

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Section: Possible Supersymmetric Dark Matter Candidatesmentioning

confidence: 99%

Supersymmetric dark matter candidates

Ellis

Olive²

2010

Particle Dark Matter

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“…With measurements of the l 1 velocity β e l1 ≡ v e l1 /c and its momentum p e l1 ≡ | p e l1 |, m e l1 can be determined: m e l1 = p e l1 (1 − β 2 e l1 ) 1/2 /β e l1 [57]. For the upcoming LHC experiments, studies of hypothetical scenarios with long-lived charged particles are actively pursued [61,62,63]. In Ref.…”

Section: Introductionmentioning

confidence: 99%

“…In Ref. [61], for example, it is shown that one should be able to measure the mass m e l1 of a (quasi-) stable slepton quite accurately at the LHC. The experimental determination of τ e l1 will be substantially more difficult than the m e l1 measurement.…”

Section: Introductionmentioning

confidence: 99%

Probing the reheating temperature at colliders and with primordial nucleosynthesis

Steffen¹

2008

Physics Letters B

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Considering gravitino dark matter scenarios with a long-lived charged slepton, we show that collider measurements of the slepton mass and its lifetime can probe not only the gravitino mass but also the post-inflationary reheating temperature TR. In a model independent way, we derive upper limits on TR and discuss them in light of the constraints from the primordial catalysis of 6 Li through bound-state effects. In the collider-friendly region of slepton masses below 1 TeV, the obtained conservative estimate of the maximum reheating temperature is about TR = 3×10 9 GeV for the limiting case of a small gluino-slepton mass splitting and about TR = 10 8 GeV for the case that is typical for universal soft supersymmetry breaking parameters at the scale of grand unification. We find that a determination of the gluino-slepton mass ratio at the Large Hadron Collider will test the possibility of TR > 10 9 GeV and thereby the viability of thermal leptogenesis with hierarchical heavy right-handed Majorana neutrinos.PACS numbers: 98.80. Cq, 95.35.+d, 12.60.Jv, 95.30.Cq

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“…Most of them will exit the interaction region appearing as "heavy muons." The slepton mass can then be determined from a combination of time-of-flight and momentum information [11][12][13]. Through ionization energy loss, a fraction of the produced sleptons will also be trapped inside the main detector [14,15] or in a separate stopper detector [2,16,17], where their decays can be precisely studied.…”

Section: Bbn and The Lhcmentioning

confidence: 99%

A definitive signal of multiple supersymmetry breaking

Cheung

Mardon

Nomura

et al. 2010

J. High Energ. Phys.

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If the lightest observable-sector supersymmetric particle (LOSP) is charged and long-lived, then it may be possible to indirectly measure the Planck mass at the LHC and provide a spectacular confirmation of supergravity as a symmetry of nature. Unfortunately, this proposal is only feasible if the gravitino is heavy enough to be measured at colliders, and this condition is in direct conflict with constraints from big bang nucleosynthesis (BBN). In this work, we show that the BBN bound can be naturally evaded in the presence of multiple sectors which independently break supersymmetry, since there is a new decay channel of the LOSP to a goldstino. Certain regions of parameter space allow for a direct measurement of LOSP decays into both the goldstino and the gravitino at the LHC. If the goldstino/gravitino mass ratio is measured to be 2, as suggested by theory, then this would provide dramatic verification of the existence of multiple supersymmetry breaking and sequestering. A variety of consistent cosmological scenarios are obtained within this framework. In particular, if an R symmetry is imposed, then the gauge-gaugino-goldstino interaction vertices can be forbidden. In this case, there is no bound on the reheating temperature from goldstino overproduction, and thermal leptogenesis can be accommodated consistently with gravitino dark matter.

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Gravitino Dark Matter scenarios with massive metastable charged sparticles at the LHC

Cited by 74 publications

References 46 publications

Supersymmetric dark matter candidates

Supersymmetric dark matter candidates

Probing the reheating temperature at colliders and with primordial nucleosynthesis

A definitive signal of multiple supersymmetry breaking

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