The unbearable lightness of being: CDMS versus XENON

Frandsen, Mads T.; Kahlhoefer, Felix; McCabe, Christopher; Sarkar, S.; Schmidt-Hoberg, Kai

doi:10.1088/1475-7516/2013/07/023

Cited by 100 publications

(159 citation statements)

References 68 publications

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“…Recently, three signal events have been also reported by CDMS [16]. Although the situation is not conclusive yet (the above claims are not consistent with the XENON100 results [27] and do not even seem to be perfectly compatible with each other [53,54,55]), the above results might be broadly accounted for by a light WIMP with a mass in the range of O (10) GeV and a spin-independent (SI) elastic DM-nucleon cross-section, σ SI , of the order of 10 −42 to 10 −40 cm 2 . As previously mentioned, it is not possible to realize the above configuration within the MSSM [23,24,22]: in fact, such a relatively large spinindependent cross-sections require a light extended Higgs sector, which is now excluded for moderate to large tan β by (i) searches at the LHC for extra Higgs bosons decaying into pairs of taus [25,26], and (ii) the recent observation of the decay B s → µ + µ − at LHCb [28] with a branching fraction compatible with the SM prediction [56].…”

Section: Direct and Indirect Dark Matter Searchesmentioning

confidence: 86%

Cornering light neutralino dark matter at the LHC

Calibbi

Lindert

Ota

et al. 2013

J. High Energ. Phys.

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We investigate the current status of the light neutralino dark matter scenario within the minimal supersymmetric standard model (MSSM) taking into account latest results from the LHC. A discussion of the relevant constraints, in particular from the dark matter relic abundance, leads us to a manageable simplified model defined by a subset of MSSM parameters. Within this simplified model we reinterpret a recent search for electroweak supersymmetric particle production based on a signature including multi-taus plus missing transverse momentum performed by the ATLAS collaboration. In this way we derive stringent constraints on the light neutralino parameter space. In combination with further experimental information from the LHC, such as dark matter searches in the monojet channel and constraints on invisible Higgs decays, we obtain a lower bound on the lightest neutralino mass of about 24 GeV. This limit is stronger than any current limit set by underground direct dark matter searches or indirect detection experiments. With a mild improvement of the sensitivity of the multi-tau search, light neutralino dark matter can be fully tested up to about 30 GeV.

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Section: Direct and Indirect Dark Matter Searchesmentioning

confidence: 86%

Cornering light neutralino dark matter at the LHC

Calibbi

Lindert

Ota

et al. 2013

J. High Energ. Phys.

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“…In the absence of unknown form factors, all experimental data can be mapped into v minspace at each DM mass and compared without specifying the nature of the astrophysical distribution or density of DM [39,40]. These "halo-independent" methods have received significant attention [41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56]. We generalize these methods to cover relativistic scattering as well, where the "halo-independence" here comes from the absence of specific assumptions regarding the local DM density, density profile, velocity distribution, and annihilation source.…”

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confidence: 99%

Direct Detection Phenomenology in Models Where the Products of Dark Matter Annihilation Interact with Nuclei

2015

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We investigate the direct detection phenomenology of a class of dark matter (DM) models in which DM does not directly interact with nuclei, but rather the products of its annihilation do. When these annihilation products are very light compared to the DM mass, the scattering in direct detection experiments is controlled by relativistic kinematics. This results in a distinctive recoil spectrum, a non-standard and or even absent annual modulation, and the ability to probe DM masses as low as a ∼10 MeV. We use current LUX data to show that experimental sensitivity to thermal relic annihilation cross sections has already been reached in a class of models. Moreover, the compatibility of dark matter direct detection experiments can be compared directly in Emin space without making assumptions about DM astrophysics, mass, or scattering form factors. Lastly, when DM has direct couplings to nuclei, the limit from annihilation to relativistic particles in the Sun can be stronger than that of conventional non-relativistic direct detection by more than three orders of magnitude for masses in a 2-7 GeV window.Introduction -While very little is known about Dark Matter (DM), its cosmological abundance is experimentally quite well-determined: Ω CDM h 2 = 0.1199 ± 0.0027 [1]. An appealing framework for understanding the relic abundance of Dark Matter (DM) is thermal freeze-out [2]. Number-changing interactions in the early universe, XX ↔ (SM)SM keep DM in thermal equilibrium with the SM bath, until the rate of these annihilation processes drops below the rate of Hubble expansion. After this point the abundance of DM is essentially fixed at, Ω CDM h 2 0.12 6 × 10 −26 cm 3 s −1 / σ ann v rel , singling out a characteristic annihilation cross section σ ann v rel for thermally produced DM to yield the observed abundance. This scenario is attractive in that it provides a simple and elegant framework for the relic abundance that can be tested in a variety of ways, including direct detection (DD) [3]. However, current constraints from DD rule out many of the simplest models of thermal relic DM, which may indicate a modification of the above picture.In this paper we investigate a modification of thermal DM which alleviates the tension between DD constraints and the thermal relic hypothesis, while making unique predictions for DD. In particular, we take the abundance of DM, X, to be determined by the annihilation process XX ↔ Y Y , where Y is a much lighter dark sector species. The interactions of the dark sector state Y with ordinary nuclei allows for a unique test of the scenario at DD experiments. The resulting DD phenomenology of this class of models is distinctive, owing to the fact that (1) the scattering partner of the nucleus is relativistic, rendering the kinematics of scattering completely different and (2) it is the flux of the scattering partner Y that determines the rate of events at a detector rather than X. Both of these features have novel consequences not considered in the literature of "model-independent" direct detecti...

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“…Elastic scattering of light DM gives a good fit to the CDMS-Si events, although there is significant tension with null results. ExoDM reduces the tension and opens up additional parameter space consistent with CDMS-Si and limits from the null search results [30]. ExoDDDM scattering allows for a CDMS-Si interpretation with heavier DM mass (lower right).…”

Section: An Exodddm Interpretation Of the Cdms-si Eventsmentioning

confidence: 95%

“…However powerful haloindependent strategies have been developed [24][25][26][27][28][29] and have made it clear that elastically scattering light DM interpretations of all anomalies are now in tension with results from the XENON experiment [30,31]. However, this tension doesn't necessarily apply to all dark matter models and can be avoided if the microphysics is different.…”

Section: An Exodddm Interpretation Of the Cdms-si Eventsmentioning

confidence: 99%

“…5 we show best-fit contours for the CDMS-Si and CRESST-II anomalies alongside experimental limits for elastically scattering standard halo DM, ExoDM and ExoDDDM. While an interpretation of the CDMS-Si and CRESST-II anomalies based on elastic scattering of light DM is in tension with XENON10 and XENON100 under the assumption of the standard halo model, an ExoDM interpretation considerably alleviates this tension [30]. Intriguingly, if the scattering were instead due to DDDM particles then there is virtually no constraint on an ExoDDDM interpretation of the CDMS-Si excess for DM with mass in the region predicted by many asymmetric DM models [45].…”

Section: An Exodddm Interpretation Of the Cdms-si Eventsmentioning

confidence: 99%

See 1 more Smart Citation

Exothermic double-disk dark matter

McCullough

Randall

2013

J. Cosmol. Astropart. Phys.

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Abstract. If a subdominant component of dark matter (DM) interacts via long-range darkforce carriers it may cool and collapse to form complex structures within the Milky Way galaxy, such as a rotating dark disk. This scenario was proposed recently and termed "Double-Disk Dark Matter" (DDDM). In this paper we consider the possibility that DDDM remains in a cosmologically long-lived excited state and can scatter exothermically on nuclei (ExoDDDM). We investigate the current status of ExoDDDM direct detection and find that ExoDDDM can readily explain the recently announced ∼ 3σ excess observed at CDMSSi, with almost all of the 90% best-fit parameter space in complete consistency with limits from other experiments, including XENON10 and XENON100. In the absence of isospindependent couplings, this consistency requires light DM with mass typically in the 5 − 15 GeV range. The hypothesis of ExoDDDM can be tested in direct detection experiments through its peaked recoil spectra, reduced annual modulation amplitude, and, in some cases, its novel time-dependence. We also discuss future direct detection prospects and additional indirect constraints from colliders and solar capture of ExoDDDM. As theoretical proof-ofprinciple, we combine the features of exothermic DM models and DDDM models to construct a complete model of ExoDDDM, exhibiting all the required properties.arXiv:1307.4095v1 [hep-ph]

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The unbearable lightness of being: CDMS versus XENON

Cited by 100 publications

References 68 publications

Cornering light neutralino dark matter at the LHC

Cornering light neutralino dark matter at the LHC

Direct Detection Phenomenology in Models Where the Products of Dark Matter Annihilation Interact with Nuclei

Exothermic double-disk dark matter

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