The first measurement of the temperature of the hydrogen 21-cm signal reported by EDGES strongly fa-vors the Coulomb-like interaction between freeze-in dark matter and baryon fluid.We investigate such dark matter in b...The first measurement of the temperature of the hydrogen 21-cm signal reported by EDGES strongly fa-vors the Coulomb-like interaction between freeze-in dark matter and baryon fluid.We investigate such dark matter in both the one-and two-component context with the light force carrier(s)essential for the Coulomb-like interaction being other than photons.Using a conversion of cross sections used by relevant experiments and Boltzmann equations to encode the effects of the dark matter-baryon interaction,we show that both cases are robustly excluded by the stringent stellar cooling bounds in the sub-GeV dark matter mass range.The exclusion of the one-component case applies to simplified freeze-in dark matter with the light force carrier as dark photons,gauged B-L,Le-Lμ,Le-Lτ,or axion-like particles,whereas the exclusion of the two-component case applies to simplified freeze-in dark matter with the two light force carriers as two axion-like particles coupled to standard model quarks and leptons.展开更多
It is well known that the observed Higgs mass is more naturally explained in the next-to-minimal supersymmetric standard model(NMSSM)than in the minimal supersymmetric standard model.Without any violation of this succ...It is well known that the observed Higgs mass is more naturally explained in the next-to-minimal supersymmetric standard model(NMSSM)than in the minimal supersymmetric standard model.Without any violation of this success,there are variants of the NMSSM that can lead to new phenomenologies.In this study,we propose a new variant of the NMSSM by imposing an unbroken R symmetry.We first identify the minimal structure of such a scenario from the perspective of both simplicity and viability,then compare the model predictions to current experimental limits,and finally highlight the main features that differ from those of well-known scenarios.展开更多
We revisit the thermal Majorana dark matter from the viewpoint of the minimal effective field theory. In this framework, analytical results for dark matter annihilation into Standard Model particles are derived. The d...We revisit the thermal Majorana dark matter from the viewpoint of the minimal effective field theory. In this framework, analytical results for dark matter annihilation into Standard Model particles are derived. The dark matter parameter space, subject to the latest LUX, Panda X-Ⅱ and Xenon-1 T limits, is presented in a model-independent way. Applications to the singlet-doublet and MSSM are presented.展开更多
Well-motivated electroweak dark matter is often hosted by an extended electroweak sector that also contains new lepton pairs with masses near the weak scale.In this study,we explore such electroweak dark matter by com...Well-motivated electroweak dark matter is often hosted by an extended electroweak sector that also contains new lepton pairs with masses near the weak scale.In this study,we explore such electroweak dark matter by combining dark matter direct detection experiments and high-luminosity LHC probes of new lepton pairs.Using Z- and W-associated electroweak processes with two or three lepton final states,we show that depending on the overall coupling constant,dark matter masses of up to 170−210 GeV can be excluded at the 2σ level and those up to 175−205 GeV can be discovered at the 5σ level at the 14 TeV LHC with integrated luminosities of 300 fb^−1 and 3000 fb^−1,respectively.展开更多
基金Supported in part by the National Natural Science Foundation of China(11775039)the High-level Talents Research and Startup Foundation Projects for Doctors of Zhoukou Normal University(ZKNUC2021006)the Natural Science Foundation of Henan Province,China(232300421358)。
文摘The first measurement of the temperature of the hydrogen 21-cm signal reported by EDGES strongly fa-vors the Coulomb-like interaction between freeze-in dark matter and baryon fluid.We investigate such dark matter in both the one-and two-component context with the light force carrier(s)essential for the Coulomb-like interaction being other than photons.Using a conversion of cross sections used by relevant experiments and Boltzmann equations to encode the effects of the dark matter-baryon interaction,we show that both cases are robustly excluded by the stringent stellar cooling bounds in the sub-GeV dark matter mass range.The exclusion of the one-component case applies to simplified freeze-in dark matter with the light force carrier as dark photons,gauged B-L,Le-Lμ,Le-Lτ,or axion-like particles,whereas the exclusion of the two-component case applies to simplified freeze-in dark matter with the two light force carriers as two axion-like particles coupled to standard model quarks and leptons.
基金Supported in part by the National Natural Science Foundation of China(11775039)the High-level Talents Research and Startup Foundation Projects for Doctors of Zhoukou Normal University(ZKNUC2021006)Scientific research projects of universities in Henan Province,China(23A140027)。
文摘It is well known that the observed Higgs mass is more naturally explained in the next-to-minimal supersymmetric standard model(NMSSM)than in the minimal supersymmetric standard model.Without any violation of this success,there are variants of the NMSSM that can lead to new phenomenologies.In this study,we propose a new variant of the NMSSM by imposing an unbroken R symmetry.We first identify the minimal structure of such a scenario from the perspective of both simplicity and viability,then compare the model predictions to current experimental limits,and finally highlight the main features that differ from those of well-known scenarios.
基金Supported by National Natural Science Foundation of China(11775039)Postdoctoral Science Foundation of China(2017M611008)
文摘We revisit the thermal Majorana dark matter from the viewpoint of the minimal effective field theory. In this framework, analytical results for dark matter annihilation into Standard Model particles are derived. The dark matter parameter space, subject to the latest LUX, Panda X-Ⅱ and Xenon-1 T limits, is presented in a model-independent way. Applications to the singlet-doublet and MSSM are presented.
基金Supported by National Natural Science Foundation of China(11775039)the Chinese Scholarship Council and the Fundamental Research Funds for the Central Universities at CQU with(cqu2017hbrc1B05)。
文摘Well-motivated electroweak dark matter is often hosted by an extended electroweak sector that also contains new lepton pairs with masses near the weak scale.In this study,we explore such electroweak dark matter by combining dark matter direct detection experiments and high-luminosity LHC probes of new lepton pairs.Using Z- and W-associated electroweak processes with two or three lepton final states,we show that depending on the overall coupling constant,dark matter masses of up to 170−210 GeV can be excluded at the 2σ level and those up to 175−205 GeV can be discovered at the 5σ level at the 14 TeV LHC with integrated luminosities of 300 fb^−1 and 3000 fb^−1,respectively.
