Vector-like quarks(VLQs)feature in new physics models beyond the standard model(SM)to address certain problems it faces.In this study,we investigate the pair production of TeV-scale vector-like B quark(VLQ-B)at the pr...Vector-like quarks(VLQs)feature in new physics models beyond the standard model(SM)to address certain problems it faces.In this study,we investigate the pair production of TeV-scale vector-like B quark(VLQ-B)at the proposed 3 TeV compact linear collider(CLIC)using a simplified effective lagrangian framework.We consider the decay modes of and,coupled with the hadronic decay of B→bZ and B→bh bosons.The large mass of VLQ-B results in highly boosted Z or h bosons,which tend to form fat-jets.Using detector simulation of the signal and background events,along with jet clustering employing a large radius R,we conduct signal-background analyses.Exclusion limits at the 95%confidence level and 5 discovery prospects are obtained assuming an integrated luminosity of 5 ab^(-1).展开更多
Within minimal extensions of the Standard Model,including weak isosinglet vector-like leptons(VLLs,τ′^(±)),we investigate the pair production of VLLs at future e^(+)e^(-)colliders,incorporating the full simulat...Within minimal extensions of the Standard Model,including weak isosinglet vector-like leptons(VLLs,τ′^(±)),we investigate the pair production of VLLs at future e^(+)e^(-)colliders,incorporating the full simulation of the initial state radiation and beam polarization effects.Two characteristic decay channels are analyzed:(i)the dilepton final state(2l+2j+1τ+E_(T)(l=e,μ))fromτ′→Zτ/Wv_(τ)with Z→ll and W→jj,and(ii)the single-lepton final state 1l+2b+1τ+E_(T)fromτ′→hτ/Wv_(τ)with h→bb and W→lv.By performing detailed detector-level simulations of both signal and background processes,we obtain the 2σexclusion limits and 5σdiscovery potential as functions of the VLL mass and integrated luminosity.The results demonstrate that future e^(+)e^(-)colliders can probe VLL masses up to mτ′≤490 GeV at√s=1TeV,740 GeV at TeV,and 1440 GeV at√s=3TeV,significantly exceeding LHC sensitivity while enabling precision measurements in the clean lepton-collider environment.展开更多
In the low energy realization of the quirk assisted Standard Model,the couplings between the exotic particles"quirks"and gauge bosons may contribute to the W mass and muon g−2 anomaly reported by FermiLab.We...In the low energy realization of the quirk assisted Standard Model,the couplings between the exotic particles"quirks"and gauge bosons may contribute to the W mass and muon g−2 anomaly reported by FermiLab.We calculate the contributions from supersymmetric quirk particles as an example.By imposing the theoretical constraints,we determined that the CDF II W-boson mass increment strictly constrains the mixing and coupling parameters and the quirk mass mF,while the muon g−2 anomaly cannot be solely attributed to the involvement of exotic particles,considering their significantly large masses.展开更多
The CDF collaboration recently announced a new measurement result for the W boson mass,and it is in tension with the standard model prediction.In this paper,we explain this anomaly in the vector-like quark(VLQ)(X,T,B)...The CDF collaboration recently announced a new measurement result for the W boson mass,and it is in tension with the standard model prediction.In this paper,we explain this anomaly in the vector-like quark(VLQ)(X,T,B)_(L,R)and leptoquark(LQ)S_(3)extended model.In this model,both the VLQ and LQ have positive corrections to the W boson mass.Moreover,it may be a solution to the(g-2)_(μ)anomaly because of the chiral enhancements from top,T,and B quarks.展开更多
Based on a simplified model including a singlet vector-like top quark T with charge|Q|=2/3,we analyze the prospects of observing T via the single T production in the tZ channel with Z decaying to neutrinos at the hadr...Based on a simplified model including a singlet vector-like top quark T with charge|Q|=2/3,we analyze the prospects of observing T via the single T production in the tZ channel with Z decaying to neutrinos at the hadronhadron colliders.This simplified model only includes two free parameters,the coupling constant g^(*)and the T quark mass m_(T).To investigate the observability of the single T production,we perform a detailed background analysis and detector simulation for the collision energies 14 TeV,27 TeV,and 100 TeV.We scan the g^(*)-m_(T)parameter space and show the exclusion and discovery capabilities on the T quark with the highest integrated luminosity designed at these colliders.Moreover,the limits from the narrow-width approximation and electro weak precision observables are considered.展开更多
A feasibility study is performed on the search for vector-like leptons(VLLs)at a muon collider in the context of the"4321 model",an ultraviolet-complete model with rich collider phenomenology and the potenti...A feasibility study is performed on the search for vector-like leptons(VLLs)at a muon collider in the context of the"4321 model",an ultraviolet-complete model with rich collider phenomenology and the potential to explain several recent existing B physics measurements or anomalies.Pair production and decays of VLLs lead to an interesting final state topology with multi-jets and multi-tau leptons.In this study,we perform a Monte Carlo investigation with various machine learning techniques and examine the projected sensitivity on VLLs over a wide mass range at a TeV-scale muon collider.We find that a 3 TeV muon collider with only 10 fb^(−1) of data can be sensitive over the mass range of a VLL up to 1450 GeV in the"4321 model."展开更多
Leptoquark(LQ)models are well motivated solutions to the(g-2)_(μ)anomaly.In the minimal LQ models,only specific representations can lead to chiral enhancements.For the scalar LQs,R_(2)and S_(1)can lead to the top qua...Leptoquark(LQ)models are well motivated solutions to the(g-2)_(μ)anomaly.In the minimal LQ models,only specific representations can lead to chiral enhancements.For the scalar LQs,R_(2)and S_(1)can lead to the top quark chiral enhancement.For the vector LQs,V_(2)and U_(1)can lead to the bottom quark chiral enhancement.When we consider the LQ and vector-like quark(VLQ)simultaneously,there can be more scenarios.In our previous study,we considered the scalar LQ and VLQ extended models with up-type quark chiral enhancement.Here,we study the scalar LQ and VLQ extended models with down-type quark chiral enhancement.We find two new models with B quark chiral enhancements,which originate from the bottom and bottom partner mixing.Then,we propose new LQ and VLQ search channels under the constraints of(g-2)_(μ).展开更多
诺如病毒(norovirus,NoV)是引发急性胃肠炎疾病的主要病原体之一。NoV易发生突变产生多种毒株,对人类健康造成严重威胁。由于缺乏成功的动物模型,抗NoV药物和疫苗的后续评价受到了限制,目前尚没有上市的疫苗用于NoV的预防。对NoV疫苗的...诺如病毒(norovirus,NoV)是引发急性胃肠炎疾病的主要病原体之一。NoV易发生突变产生多种毒株,对人类健康造成严重威胁。由于缺乏成功的动物模型,抗NoV药物和疫苗的后续评价受到了限制,目前尚没有上市的疫苗用于NoV的预防。对NoV疫苗的研究进展进行了综述,重点阐述了病毒样颗粒(virus like particles,VLP)疫苗、病毒载体疫苗和基于P颗粒疫苗的研究现状和发展前景,以期为NoV疫苗的研发提供新思路。展开更多
基金Supported in part by the National Natural Science Foundation of China(12147214,11905093)Basic Research Project of Liaoning Provincial Department of Education for Universities(LJKMZ20221431)Teaching Reform Research Project for graduates of Liaoning Normal University。
文摘Vector-like quarks(VLQs)feature in new physics models beyond the standard model(SM)to address certain problems it faces.In this study,we investigate the pair production of TeV-scale vector-like B quark(VLQ-B)at the proposed 3 TeV compact linear collider(CLIC)using a simplified effective lagrangian framework.We consider the decay modes of and,coupled with the hadronic decay of B→bZ and B→bh bosons.The large mass of VLQ-B results in highly boosted Z or h bosons,which tend to form fat-jets.Using detector simulation of the signal and background events,along with jet clustering employing a large radius R,we conduct signal-background analyses.Exclusion limits at the 95%confidence level and 5 discovery prospects are obtained assuming an integrated luminosity of 5 ab^(-1).
基金Supported by the Science and Technology plan Projects of Henan province(242102310325,242102230026)。
文摘Within minimal extensions of the Standard Model,including weak isosinglet vector-like leptons(VLLs,τ′^(±)),we investigate the pair production of VLLs at future e^(+)e^(-)colliders,incorporating the full simulation of the initial state radiation and beam polarization effects.Two characteristic decay channels are analyzed:(i)the dilepton final state(2l+2j+1τ+E_(T)(l=e,μ))fromτ′→Zτ/Wv_(τ)with Z→ll and W→jj,and(ii)the single-lepton final state 1l+2b+1τ+E_(T)fromτ′→hτ/Wv_(τ)with h→bb and W→lv.By performing detailed detector-level simulations of both signal and background processes,we obtain the 2σexclusion limits and 5σdiscovery potential as functions of the VLL mass and integrated luminosity.The results demonstrate that future e^(+)e^(-)colliders can probe VLL masses up to mτ′≤490 GeV at√s=1TeV,740 GeV at TeV,and 1440 GeV at√s=3TeV,significantly exceeding LHC sensitivity while enabling precision measurements in the clean lepton-collider environment.
基金Supported by the National Natural Science Foundation of China (12075213)。
文摘In the low energy realization of the quirk assisted Standard Model,the couplings between the exotic particles"quirks"and gauge bosons may contribute to the W mass and muon g−2 anomaly reported by FermiLab.We calculate the contributions from supersymmetric quirk particles as an example.By imposing the theoretical constraints,we determined that the CDF II W-boson mass increment strictly constrains the mixing and coupling parameters and the quirk mass mF,while the muon g−2 anomaly cannot be solely attributed to the involvement of exotic particles,considering their significantly large masses.
基金Supported by an appointment to the Young Scientist Training Program at the APCTP through the Science and Technology Promotion FundLottery Fund of the Korean Governmentsupported by the Korean Local Governments-Gyeongsangbuk-do Province and Pohang City。
文摘The CDF collaboration recently announced a new measurement result for the W boson mass,and it is in tension with the standard model prediction.In this paper,we explain this anomaly in the vector-like quark(VLQ)(X,T,B)_(L,R)and leptoquark(LQ)S_(3)extended model.In this model,both the VLQ and LQ have positive corrections to the W boson mass.Moreover,it may be a solution to the(g-2)_(μ)anomaly because of the chiral enhancements from top,T,and B quarks.
基金Supported by the National Natural Science Foundation of China(NNSFC)(11705048)the National Research Project Cultivation Foundation of Henan Normal University(2020PL16,2021PL10)+1 种基金the Startup Foundation for Doctors of Henan Normal University(qd18115)powered by the High Performance Computing Center of Henan Normal University。
文摘Based on a simplified model including a singlet vector-like top quark T with charge|Q|=2/3,we analyze the prospects of observing T via the single T production in the tZ channel with Z decaying to neutrinos at the hadronhadron colliders.This simplified model only includes two free parameters,the coupling constant g^(*)and the T quark mass m_(T).To investigate the observability of the single T production,we perform a detailed background analysis and detector simulation for the collision energies 14 TeV,27 TeV,and 100 TeV.We scan the g^(*)-m_(T)parameter space and show the exclusion and discovery capabilities on the T quark with the highest integrated luminosity designed at these colliders.Moreover,the limits from the narrow-width approximation and electro weak precision observables are considered.
基金Supported in part by the National Natural Science Foundation of China (12150005, 12075004,. 12061141002)MOST (2018YFA0403900)
文摘A feasibility study is performed on the search for vector-like leptons(VLLs)at a muon collider in the context of the"4321 model",an ultraviolet-complete model with rich collider phenomenology and the potential to explain several recent existing B physics measurements or anomalies.Pair production and decays of VLLs lead to an interesting final state topology with multi-jets and multi-tau leptons.In this study,we perform a Monte Carlo investigation with various machine learning techniques and examine the projected sensitivity on VLLs over a wide mass range at a TeV-scale muon collider.We find that a 3 TeV muon collider with only 10 fb^(−1) of data can be sensitive over the mass range of a VLL up to 1450 GeV in the"4321 model."
基金Supported by an appointment to the Young Scientist Training Program at the APCTP through the Science and Technology Promotion Fund and Lottery Fund of the Korean Governmentsupported by the Korean Local Governments-Gyeongsangbuk-do Province and Pohang City
文摘Leptoquark(LQ)models are well motivated solutions to the(g-2)_(μ)anomaly.In the minimal LQ models,only specific representations can lead to chiral enhancements.For the scalar LQs,R_(2)and S_(1)can lead to the top quark chiral enhancement.For the vector LQs,V_(2)and U_(1)can lead to the bottom quark chiral enhancement.When we consider the LQ and vector-like quark(VLQ)simultaneously,there can be more scenarios.In our previous study,we considered the scalar LQ and VLQ extended models with up-type quark chiral enhancement.Here,we study the scalar LQ and VLQ extended models with down-type quark chiral enhancement.We find two new models with B quark chiral enhancements,which originate from the bottom and bottom partner mixing.Then,we propose new LQ and VLQ search channels under the constraints of(g-2)_(μ).
文摘诺如病毒(norovirus,NoV)是引发急性胃肠炎疾病的主要病原体之一。NoV易发生突变产生多种毒株,对人类健康造成严重威胁。由于缺乏成功的动物模型,抗NoV药物和疫苗的后续评价受到了限制,目前尚没有上市的疫苗用于NoV的预防。对NoV疫苗的研究进展进行了综述,重点阐述了病毒样颗粒(virus like particles,VLP)疫苗、病毒载体疫苗和基于P颗粒疫苗的研究现状和发展前景,以期为NoV疫苗的研发提供新思路。
