A cosmological upper bound on superpartner masses

Motivated by the absence of signals of new physics in searches for both new particles at the LHC and a weakly interacting massive particle dark matter candidate, we consider a scenario where supersymmetry is broken at a scale above the reheating temperature. The low-energy particle content then only consists of Standard Model states and a gravitino. We investigate the possibility that the latter provides the main component of dark matter through the annihilation of thermalized Standard Model particles. We focus on the case where its production through scattering in the thermal plasma is well approximated by the nonlinear supersymmetric effective Lagrangian of the associated Goldstino and identify the parameter space allowed by the cosmological constraints, allowing the possibility of a large reheating temperature compatible with leptogenesis scenarios and alleviating the so-called "gravitino problem".

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“…A nice summary can be found in Ref. [43]. Adding the BBN constraints gives an upper bound on the gravitino mass of about 10 GeV [44][45][46].…”

Section: The Frameworkmentioning

confidence: 93%

Minimal model of gravitino dark matter

et al. 2017

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“…Such a scenario can happen for example if R-parity is broken very weakly (see e.g [36]) , or if the neutralino is not the actual LSP and decays e.g. into gravitinos (see e.g [37]). Another possibility is a non-standard cosmological history, for example late decaying particles can inject additional entropy after χ 0 1 freezes out, such that its relic density is diluted (see e.g.…”

Section: Jhep03(2014)060mentioning

confidence: 99%

Compressed electroweakino spectra at the LHC

Schwaller

Zurita

2014

J. High Energ. Phys.

138

146

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In this work, we examine the sensitivity of monojet searches at the LHC to directly produced charginos and neutralinos (electroweakinos) in the limit of small mass splitting, where the traditional multilepton plus missing energy searches loose their sensitivity. We first recast the existing 8 TeV monojet search at CMS in terms of a SUSY simplified model with only light gauginos (winos and binos) or only light Higgsinos. The current searches are not sensitive to MSSM-like production cross sections, but would be sensitive to models with 2-20 times enhanced production cross section, for particle masses between 100 GeV and 250 GeV. Then we explore the sensitivity in the 14 TeV run of the LHC. Here we emphasise that in addition to the pure monojet search, soft leptons present in the samples can be used to increase the sensitivity. Exclusion of electroweakino masses up to 200 GeV is possible with 300 fb −1 at the LHC, if the systematic error can be reduced to the 1% level. Discovery is possible with 3000 fb −1 in some regions of parameter space.

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“…In consequence, for a given value of a SUSY µ smuons can be heavier. 10 However, if the stau masses are larger than the smuon masses by a factor bigger than about 15 (which roughly corresponds to the ratio of the tau to muon masses) the vacuum stability constraint in the muon direction becomes more stringent than that in the stau direction. In such a case (g − 2) µ can be within the 1σ experimental bound for the lightest smuon mass up to about 1.2 TeV (for so heavy smuons µ would have to be above 300 TeV for tan β = 10).…”

Section: A Bino Contributionmentioning

confidence: 99%

“…[19] that a large non-universality between smuon and stau masses leads to a strong tension with µ → eγ unless lepton flavor violation is extremely 10 If the stau masses are lighter than the smuon and electron masses the bino contribution to (g − 2)µ is more constrained by the vacuum stability in the stau direction and the smuons have to be lighter than in the universal slepton case.…”

Section: A Bino Contributionmentioning

confidence: 99%

“…For a good supersymmetric dark matter candidate and for the gauge coupling unification gauginos should be relatively light [7,8]. More recently, there have been attempts to set an upper bound on supersymmetric mass scale using some theoretical [9] or phenomenological [10] arguments without relying on naturalness. In this paper, we focus on the anomalous magnetic moment of muon and calculate upper bounds on the superpartner masses under the assumption that supersymmetry explains the apparent excess in the measured value [11] of this observable over the Standard Model (SM) prediction [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Upper bounds on sparticle masses from muon g − 2 and the Higgs mass and the complementarity of future colliders

Badziak

Lalak

Lewicki

et al. 2015

J. High Energ. Phys.

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Supersymmetric (SUSY) explanation of the discrepancy between the measurement of (g − 2) µ and its SM prediction puts strong upper bounds on the chargino and smuon masses. At the same time, lower experimental limits on the chargino and smuon masses, combined with the Higgs mass measurement, lead to an upper bound on the stop masses. The current LHC limits on the chargino and smuon masses (for not too compressed spectrum) set the upper bound on the stop masses of about 10 TeV. The discovery potential of the future lepton and hadron colliders should lead to the discovery of SUSY if it is responsible for the explanation of the (g − 2) µ anomaly. This conclusion follows from the fact that the upper bound on the stop masses decreases with the increase of the lower experimental limit on the chargino and smuon masses.

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A cosmological upper bound on superpartner masses

Cited by 15 publications

References 44 publications

Minimal model of gravitino dark matter

Minimal model of gravitino dark matter

Compressed electroweakino spectra at the LHC

Upper bounds on sparticle masses from muon g − 2 and the Higgs mass and the complementarity of future colliders

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