Constraining Dark Matter Models with a Light Mediator at the PandaX-II Experiment

Ren, Xiangxiang; Zhao, Li; Abdukerim, Abdusalam; Chen, Xun; Chen, Yunhua; Cui, X. F.; Fang, Deqing; Fu, Changbo; Giboni, Karl; Giuliani, F.; Gu, Linhui; Guo, Xuyuan; Han, K.; He, Changda; Huang, Di; He, Shengming; Huang, X. T.; Huang, Zhongqiang; Ji, Xiangdong; Ju, Yonglin; Li, Yao; Lin, Huibin; Liu, Huaxuan; Liu, Jianglai; Ma, Yugang; Mao, Y.; Ni, K.; Ning, Jinhua; Tan, Andi; Wang, Hongwei; Wang, Meng; Wang, Qiuhong; Wang, Siguang; Wang, Xiuli; Wu, Shengji; Xia, Jingkai; Xiao, M.; Xie, Pengwei; Yan, Binbin; Yang, Jijun; Yang, Y.; Yu, Hai-Bo; Yue, Jianfeng; Zhang, Tao; Zhou, Jifang; Zhou, N.; Zheng, Qibin; Zhou, Xiaopeng

doi:10.1103/physrevlett.121.021304

Cited by 89 publications

(87 citation statements)

References 35 publications

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“…We assume that this potential leads to a vacuum expectation value of φ which will then generally provide a Majorana mass for the left-and right-handed part of ψ. 2 This results in the following mass matrix,…”

Section: A Simple Modelmentioning

confidence: 99%

“…If DM has non-negligible couplings to Standard Model (SM) states it could potentially be produced at particle colliders or be observed in direct and indirect detection experiments. For DM masses above a few GeV, direct detection experiments in particular have put very severe bounds on the DM scattering cross section [1,2], while smaller DM masses are less constrained because of the finite threshold energy required by these experiments. Correspondingly a lot of attention is currently focused on rather light DM and associated dark sector states with masses in the MeV to GeV range [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Invisible and displaced dark matter signatures at Belle II

Duerr

Ferber

Hearty

et al. 2020

J. High Energ. Phys.

121

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Many dark matter models generically predict invisible and displaced signatures at Belle II, but even striking events may be missed by the currently implemented search programme because of inefficient trigger algorithms. Of particular interest are final states with a single photon accompanied by missing energy and a displaced pair of electrons, muons, or hadrons. We argue that a displaced vertex trigger will be essential to achieve optimal sensitivity at Belle II. To illustrate this point, we study a simple but well-motivated model of thermal inelastic dark matter in which this signature naturally occurs and show that otherwise inaccessible regions of parameter space can be tested with such a search. We also evaluate the sensitivity of single-photon searches at BaBar and Belle II to this model and provide detailed calculations of the relic density target.

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Section: A Simple Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Invisible and displaced dark matter signatures at Belle II

Duerr

Ferber

Hearty

et al. 2020

J. High Energ. Phys.

121

View full text Add to dashboard Cite

show abstract

“…The latter was either estimated by using eq. (3.1) for the minimal recoil energy adopted in the respective analysis, or by directly fitting to data provided by the experiment (for PandaX-II [27]). We note that carefully modelling inelastic scattering processes, resulting in the emission of a photon or an atomic electron, in principle allows to improve sensitivities in the few 100 MeV range [72][73][74].…”

Section: Conventional Light Dark Matter Detectionmentioning

confidence: 99%

“…The existence of dark matter (DM) is one of the main arguments to expect physics beyond the SM. Also in this case theoretical considerations seem to point to the electroweak scale [25], independently of the arguments mentioned above, but direct searches for DM in the form of weakly interacting massive particles (WIMPs) have started to place ever more stringent constraints on this possibility [26,27]. Significant interest, both from the experimental and theoretical perspective, has thus turned to the possibility of DM particle masses below the GeV -TeV range.…”

Section: Introductionmentioning

confidence: 99%

Direct detection and complementary constraints for sub-GeV dark matter

Bondarenko

Boyarsky

Bringmann

et al. 2020

J. High Energ. Phys.

101

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Traditional direct searches for dark matter, looking for nuclear recoils in deep underground detectors, are challenged by an almost complete loss of sensitivity for light dark matter particles. Consequently, there is a significant effort in the community to devise new methods and experiments to overcome these difficulties, constantly pushing the limits of the lowest dark matter mass that can be probed this way. From a model-building perspective, the scattering of sub-GeV dark matter on nucleons essentially must proceed via new light mediator particles, given that collider searches place extremely stringent bounds on contact-type interactions. Here we present an updated compilation of relevant limits for the case of a scalar mediator, including a new estimate of the near-future sensitivity of the NA62 experiment as well as a detailed evaluation of limits from Big Bang nucleosynthesis. We also derive updated and more general limits on DM particles upscattered by cosmic rays, applicable to arbitrary energy-and momentum dependences of the scattering cross section. Finally we stress that dark matter self-interactions place stringent limits independently of the dark matter production mechanism. These are, for the relevant parameter space, generically comparable to those that apply in the commonly studied freeze-out case. We conclude that the combination of existing (or expected) constraints from accelerators and astrophysics, combined with cosmological requirements, puts robust limits on the maximally possible nuclear scattering rate. In most regions of parameter space these are at least competitive with the best projected limits from currently planned direct detection experiments.arXiv:1909.08632v2 [hep-ph]

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“…More recently, there is growing interest in considering particle physics realizations of SIDM with multiple states. For example, to avoid strong bounds from direct detection experiments [24][25][26][27], Refs. [28,29] propose an inelastic SIDM model, where there are two dark states and they differ by a small mass splitting [30,31].…”

Section: Introductionmentioning

confidence: 99%

Astrophysical probes of inelastic dark matter with a light mediator

Álvarez

2020

Phys. Rev. D

Self Cite

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We consider an inelastic dark matter model, where a fermion is charged under a broken U(1) gauge symmetry, and introduce a tiny Majorana mass term to split the fermion into two states with the light one being a dark matter candidate. If the gauge boson is light, it can mediate both elastic and inelastic dark matter self-interactions in dark halos, leading to observational consequences. Using a numerical technique based on partial wave analysis, we accurately calculate the elastic and inelastic self-scattering cross sections. We assume a thermal freeze-out scenario and fix the gauge coupling constant using the relic density constraint. Then, we focus on six benchmark masses of dark matter, covering a wide range from 10 MeV to 160 GeV and map parameter regions where the elastic scattering cross section per unit mass is within 1 cm 2 /g-5 cm 2 /g, favored to solve small-scale issues of cold dark matter. If the heavy state can decay to the light state and a massless species, the inelastic up-scattering process can cool the halo and lead to core collapse. Taking galaxies with evidence of dark matter density cores, we further derive constraints on the parameter space. For dark matter masses below 10 GeV, the mass splitting must be large enough to forbid up scattering in the dwarf halo for evading the core-collapse constraint; while for higher masses, the up-scattering process can still be allowed. Our results show astrophysical observations can provide powerful tests for dark matter models with large elastic and inelastic self-interactions.

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Constraining Dark Matter Models with a Light Mediator at the PandaX-II Experiment

Cited by 89 publications

References 35 publications

Invisible and displaced dark matter signatures at Belle II

Invisible and displaced dark matter signatures at Belle II

Direct detection and complementary constraints for sub-GeV dark matter

Astrophysical probes of inelastic dark matter with a light mediator

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