Extending the reach of compressed gluinos at the LHC

Delgado, A.; Martin, Adam; Raj, Nirmal

doi:10.1103/physrevd.94.115010

Cited by 6 publications

(6 citation statements)

References 87 publications

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“…However the thermally averaged annihilation cross sections for these processes are not exactly zero because particles in the early universe have an energy distribution like the Maxwell-Boltzmann distribution. Thus it is possible to reproduce the correct relic density by the forbidden channels [13,15,16,44]. The thermally averaged annihilation cross sections for the forbidden channels are suppressed by the Boltzmann factor, thus the order of the magnitude of the couplings required to reproduce the correct relic density would be larger than the case of normal WIMPs.…”

Section: Relic Density Of Smentioning

confidence: 99%

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Implications of two-component dark matter induced by forbidden channels and thermal freeze-out

Aoki

Toma

2017

J. Cosmol. Astropart. Phys.

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We consider a model of two-component dark matter based on a hidden U (1) D symmetry, in which relic densities of the dark matter are determined by forbidden channels and thermal freeze-out. The hidden U (1) D symmetry is spontaneously broken to a residual Z 4 symmetry, and the lightest Z 4 charged particle can be a dark matter candidate. Moreover, depending on the mass hierarchy in the dark sector, we have two-component dark matter. We show that the relic density of the lighter dark matter component can be determined by forbidden annihilation channels which require larger couplings compared to the normal freeze-out mechanism. As a result, a large self-interaction of the lighter dark matter component can be induced, which may solve small scale problems of ΛCDM model. On the other hand, the heavier dark matter component is produced by normal freeze-out mechanism. We find that interesting implications emerge between the two dark matter components in this framework. We explore detectabilities of these dark matter particles and show some parameter space can be tested by the SHiP experiment.

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Section: Relic Density Of Smentioning

confidence: 99%

“…1 In addition, the candidate which is a kind of WIMPless dark matter [14] produced by forbidden channels is another possibility to obtain a large self-interacting cross section [13,15,16].…”

Section: Introductionmentioning

confidence: 99%

Implications of two-component dark matter induced by forbidden channels and thermal freeze-out

Aoki

Toma

2017

J. Cosmol. Astropart. Phys.

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“…These exceptions lead to phenomenology that can differ significantly from standard WIMPs (see for example [11][12][13]34]), while sharing their appealing theoretical features.…”

mentioning

confidence: 99%

Fourth Exception in the Calculation of Relic Abundances

2017

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We propose that the dark matter abundance is set by the decoupling of inelastic scattering instead of annihilations. This coscattering mechanism is generically realized if dark matter scatters against states of comparable mass from the thermal bath. Coscattering points to dark matter that is exponentially lighter than the weak scale and has a suppressed annihilation rate, avoiding stringent constraints from indirect detection. Dark matter upscatters into states whose late decays can lead to observable distortions to the blackbody spectrum of the cosmic microwave background.Introduction: Dark Matter (DM) constitutes most of the matter in our Universe, but its origin is unknown. One of the most attractive possibilities is that DM starts in thermal equilibrium in the early Universe, and its abundance is set once its annihilations become slower than the expansion rate. This framework is insensitive to initial conditions and has the further appeal of tying the DM abundance to its (potentially observable) interactions.The most widely considered possibility is that 2-to-2 annihilations to Standard Model (SM) particles set the DM relic density. This is known as the Weakly Interacting Massive Particle (WIMP) paradigm [1-4] and points to DM particles with weak scale masses and crosssections. This theoretical framework has had considerable impact shaping experimental searches for DM.However it has long been appreciated that simple variations to the cosmology of thermal relics can have dramatic consequences. In a seminal paper, Ref.[5] enumerates three "exceptions" to thermal relic cosmology: (1) mutual annihilations of multiple species (coannihilations), (2) annihilations into heaver states (forbidden channels), and (3) annihilations near a pole in the cross section. These exceptions lead to phenomenology that can differ significantly from standard WIMPs (see for example [11][12][13]34]), while sharing their appealing theoretical features.In this letter, we introduce a fourth exception. Like Ref.[5], we assume DM begins in thermal equilibrium, has its number diluted through 2-to-2 annihilations, and has a temperature that tracks the photon temperature (for studies that relax at least one of these assumptions see for example Refs. [14][15][16][17][18][19][20][21][22][23][24][25][26][27]). We consider the presence of two states charged under the symmetry that stabilizes DM: χ and ψ, where m χ < m ψ and χ is DM. We assume that χ annihilations are suppressed, and two processes are active:

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“…We remark that although the strongest bounds for this search are obtained by tagging on ISR jets, the traditional ATLAS monojet search [20] leads to much weaker bounds for our choices of ∆. On the other hand, we expect that dedicated analyses beyond the monojet and multijet + MET searches can improve the sensitivity to compressed spectra [82,83].…”

Section: Jets + Met Searchesmentioning

confidence: 85%

Hunting for dark matter coannihilation by mixing dijet resonances and missing transverse energy

Buschmann

Hedri

Kaminska

et al. 2016

J. High Energ. Phys.

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Simplified models of the dark matter (co)annihilation mechanism predict striking new collider signatures untested by current searches. These models, which were codified in the coannihilation codex, provide the basis for a dark matter (DM) discovery program at the Large Hadron Collider (LHC) driven by the measured DM relic density. In this work, we study an exemplary model featuring s-channel DM coannihilation through a scalar diquark mediator as a representative case study of scenarios with strongly interacting coannihilation partners. We discuss the full phenomenology of the model, ranging from low energy flavor constraints, vacuum stability requirements, and precision Higgs effects to direct detection and indirect detection prospects. Moreover, motivated by the relic density calculation, we find significant portions of parameter space are compatible with current collider constraints and can be probed by future searches, including a proposed analysis for the novel signature of a dijet resonance accompanied by missing transverse energy (MET). Our results show that the 13 TeV LHC with 100 fb −1 luminosity should be sensitive to mediators as heavy as 1 TeV and dark matter in the 400-500 GeV range. The combination of searches for single and paired dijet peaks, non-resonant jets + MET excesses, and our novel resonant dijet + MET signature have strong coverage of the motivated relic density region, reflecting the tight connections between particles determining the dark matter abundance and their experimental signatures at the LHC.

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Extending the reach of compressed gluinos at the LHC

Cited by 6 publications

References 87 publications

Implications of two-component dark matter induced by forbidden channels and thermal freeze-out

Implications of two-component dark matter induced by forbidden channels and thermal freeze-out

Fourth Exception in the Calculation of Relic Abundances

Hunting for dark matter coannihilation by mixing dijet resonances and missing transverse energy

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