分类： 天文学 >> 天文学 提交时间： 2023-02-19
摘要： We propose a new candidate of GeV scale inelastic dark matter (DM). Our construction has an anomaly-free $U(1)_X^{}$ gauge group with dark photon mediator, and can realize either scalar or fermionic inelastic DM. It is highly predictive and testable. We study the scattering rate of light inelastic DM with electrons in the XENON1T experiment and with nuclei in the XENON1T, CRESST-III, CDEX-1B and DarkSide-50 experiments. We resolve the recent XENON1T anomaly via electron recoil detection. Combining the XENON1T constraints from both electron recoils and nuclear recoils (including Migdal effect), we predict the inelastic DM mass $\lesssim 1.5$GeV. We further analyze the bounds by the DM relic abundance, the lifetime of the heavier DM component, and laboratory constraints, from which we identify the viable parameter space for the future probe. This provides an important benchmark for the theories and experimental tests of GeV scale inelastic DM.
分类： 物理学 >> 核物理学 提交时间： 2016-09-14
摘要： The LHC discovery of a light Higgs particle h0 (125GeV) opens up new prospect for searching heavier Higgs boson(s) at the LHC Run-2, which will unambiguously point to new physics beyond the standard model (SM). We study the detection of a heavier neutral Higgs boson H0 via di-Higgs production channel at the LHC (14TeV), H0→h0h0→WW∗γγ. This directly probes the Hhh cubic Higgs interaction, which exists in most extensions of the SM Higgs sector. For the decay products of final states WW∗, we include both pure leptonic mode WW∗→ℓν¯ℓ¯ν and semi-leptonic mode WW∗→qq¯′ℓν. We analyze signals and backgrounds by performing fast detector simulation for the full processes pp→H→hh→WW∗γγ→ℓν¯ℓ¯νγγ and pp→H→hh→WW∗γγ→ℓνqq¯′γγ, over the mass range MH=250−600GeV. For generic two-Higgs-doublet models (2HDM), we present the discovery reach of the heavier Higgs boson at the LHC Run-2, and compare it with the current Higgs global fit of the 2HDM parameter space.
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