New physics could be explored through loop effects using the precision measurements at the Circular Electron Positron Collider(CEPC)owing to its clean collision environment and high luminosity.In this paper,we focus o...New physics could be explored through loop effects using the precision measurements at the Circular Electron Positron Collider(CEPC)owing to its clean collision environment and high luminosity.In this paper,we focus on two dark matter models that involve additional electroweak fermionic multiplets.We calculate their one-loop corrections in five processes,i.e.,e^(+)e^(-)→μ^(+)μ^(-),Zh,W^(+)W^(-),ZZ,and,Zγ,and investigate the corresponding signatures at the CEPC with the projected sensitivity.We observe that the detectable parameter regions of these processes are complementary.The combined analysis shows that the mass of dark matter m_(χ^(0)_(1))in these two models can be probed up to-150GeV and-450GeV,respectively,at a 95%confidence level.展开更多
A QCD multiquark cluster system is studied in the relativistic harmonic oscillator potential model （RHOPM）, and the electromagnetic form factors of the pion, proton and deuteron in the RHOPM are predicted. The calcu...A QCD multiquark cluster system is studied in the relativistic harmonic oscillator potential model （RHOPM）, and the electromagnetic form factors of the pion, proton and deuteron in the RHOPM are predicted. The calculated theoretical results are then compared with existing experimental data, finding very good agreement between the theoretical predictions and experimental data for these three target particles. We claim that this model can be applied to study QCD hadronic properties, particularly neutron properties, and to find six-quark cluster and/or nine-quark cluster probabilities in light nuclei such as helium 3He and tritium 3H. This is a problem of particular importance and interest in quark nuclear physics.展开更多
Direct detection experiments tend to lose sensitivity in searches for sub-MeV light dark matter candidates due to the threshold of recoil energy.However,such light dark matter particles could be accelerated by energet...Direct detection experiments tend to lose sensitivity in searches for sub-MeV light dark matter candidates due to the threshold of recoil energy.However,such light dark matter particles could be accelerated by energetic cosmic rays,such that they could be detected with existing detectors.We derive constraints on the scattering of a boosted light dark matter particle and electron from the XENON100/1T experiment.We illustrate that the energy dependence of the cross section plays a crucial role in improving both the detection sensitivity and also the complementarity of direct detection and other experiments.展开更多
The sensitivity of the direct detection of dark matter(DM)approaches the so-called neutrino floor,below which it is difficult to disentangle the DM candidate from the neutrino background.In this work,we consider the s...The sensitivity of the direct detection of dark matter(DM)approaches the so-called neutrino floor,below which it is difficult to disentangle the DM candidate from the neutrino background.In this work,we consider the scenario that no DM signals are reported in various DM direct detection experiments and explore whether collider searches could probe DM below the neutrino floor.We adopt several simplified models in which the DM candidate couples to electroweak gauge bosons or leptons in the standard model only through high-dimensional operators.After including the RGE running effect,we investigate the constraints of direct detection,indirect detection,and collider searches.The collider search can probe light DM below the neutrino floor.Particularly,for the effective interaction of χχBμνB^μν,current data from the mono-photon channel at the 13 TeV LHC has already covered the entire parameter space of the neutrino floor.展开更多
基金Supported by the National Natural Science Foundation of China (12175248)Supported by the research grant"the Dark Universe:A Synergic Multi-messenger Approach"number (2017X7X85K) under the program PRIN 2017 funded by the Ministero dell’Istruzione,Universitàe della Ricerca (MIUR)
文摘New physics could be explored through loop effects using the precision measurements at the Circular Electron Positron Collider(CEPC)owing to its clean collision environment and high luminosity.In this paper,we focus on two dark matter models that involve additional electroweak fermionic multiplets.We calculate their one-loop corrections in five processes,i.e.,e^(+)e^(-)→μ^(+)μ^(-),Zh,W^(+)W^(-),ZZ,and,Zγ,and investigate the corresponding signatures at the CEPC with the projected sensitivity.We observe that the detectable parameter regions of these processes are complementary.The combined analysis shows that the mass of dark matter m_(χ^(0)_(1))in these two models can be probed up to-150GeV and-450GeV,respectively,at a 95%confidence level.
基金National Natural Science Foundation of China(10975033,11275048,11365002)Guangxi Province Natural Science Foundation(2013GXNSFBB053007,2011GXNSGA018140)+1 种基金Department of Guangxi Education for the Excellent Scholars of Higher Education(2011-54)Doctoral Science Foundation of Guangxi University of Science and Technology(11Z16)~~
基金Supported by National Natural Science Foundation of China(11365002)Guangxi Natural Science Foundation for Young Researchers(2013GXNSFBB053007,2011GXNSFA018140)+2 种基金Guangxi Education Department(2013ZD049)Guangxi Grant for Excellent Researchers(2011-54)Guangxi University of Science and Technology Foundation for PhDs(11Z16)
文摘A QCD multiquark cluster system is studied in the relativistic harmonic oscillator potential model （RHOPM）, and the electromagnetic form factors of the pion, proton and deuteron in the RHOPM are predicted. The calculated theoretical results are then compared with existing experimental data, finding very good agreement between the theoretical predictions and experimental data for these three target particles. We claim that this model can be applied to study QCD hadronic properties, particularly neutron properties, and to find six-quark cluster and/or nine-quark cluster probabilities in light nuclei such as helium 3He and tritium 3H. This is a problem of particular importance and interest in quark nuclear physics.
基金Supported in part by the National Science Foundation of China(11725520,11675002,11635001)QFX is also supported by the China Postdoctoral Science Foundation(8206300015).
文摘Direct detection experiments tend to lose sensitivity in searches for sub-MeV light dark matter candidates due to the threshold of recoil energy.However,such light dark matter particles could be accelerated by energetic cosmic rays,such that they could be detected with existing detectors.We derive constraints on the scattering of a boosted light dark matter particle and electron from the XENON100/1T experiment.We illustrate that the energy dependence of the cross section plays a crucial role in improving both the detection sensitivity and also the complementarity of direct detection and other experiments.
基金Supported in part by the National Science Foundation of China(11725520,11675002,11635001)in part by the China Postdoctoral Science Foundation(8206300015)。
文摘The sensitivity of the direct detection of dark matter(DM)approaches the so-called neutrino floor,below which it is difficult to disentangle the DM candidate from the neutrino background.In this work,we consider the scenario that no DM signals are reported in various DM direct detection experiments and explore whether collider searches could probe DM below the neutrino floor.We adopt several simplified models in which the DM candidate couples to electroweak gauge bosons or leptons in the standard model only through high-dimensional operators.After including the RGE running effect,we investigate the constraints of direct detection,indirect detection,and collider searches.The collider search can probe light DM below the neutrino floor.Particularly,for the effective interaction of χχBμνB^μν,current data from the mono-photon channel at the 13 TeV LHC has already covered the entire parameter space of the neutrino floor.
