Electron-positron colliders operating in the GeV center-of-mass range,or tau-charm energy region,have been proved to enable competitive frontier research due to several unique features.With the progress of high-energy...Electron-positron colliders operating in the GeV center-of-mass range,or tau-charm energy region,have been proved to enable competitive frontier research due to several unique features.With the progress of high-energy physics in the last two decades,a new-generation Tau-Charm factory,called the Super Tau-Charm Facility(STCF),has been actively promoted by the particle physics community in China.STCF has the potential to address fundamental questions such as the essence of color confinement and the matter-antimatter asymmetry within the next decades.The main design goals of the STCF are a center-of-mass energy ranging from 2 to 7 GeV and a luminosity surpassing 5×10^(34)cm^(−2)s^(−1)that is optimized at a center-of-mass energy of 4 GeV,which is approximately 50 times that of the currently operating Tau-Charm factory-BEPCII.The STCF accelerator has two main parts:a double-ring collider with a crab-waist collision scheme and an injector that provides top-up injections for both electron and positron beams.As a typical third-generation electron-positron circular collider,the STCF accelerator faces many challenges in both accelerator physics and technology.In this paper,the conceptual design of the STCF accelerator complex is presented,including the ongoing efforts and plans for technological research and develop-ment,as well as the required infrastructure.The STCF project aims to secure support from the Chinese central government for its construction during the 15th Five-Year Plan(2026-2030).展开更多
The Higgs sector of the standard model can be extended by introducing an SU(2)_(L) Higgs tripletΔto generate tiny neutrino masses in the framework of the type-Ⅱseesaw mechanism.In this paper,we study the pair produc...The Higgs sector of the standard model can be extended by introducing an SU(2)_(L) Higgs tripletΔto generate tiny neutrino masses in the framework of the type-Ⅱseesaw mechanism.In this paper,we study the pair production of the introduced Higgs triplet at future e-p colliders.The corresponding production cross sections via the vector boson fusion process at the FCC-ep and ILC■FCC are predicted,where the production of a pair of doubly charged Higgs is found to be dominant and then used to investigate the collider phenomenology of the Higgs triplet.Depending on the size of the Higgs triplet vacuum expectation value,the doubly charged Higgs may decay into a pair of same-sign charged leptons or a pair of same-sign W bosons.To explore the discovery potential of the doubly charged Higgs at future e-p colliders,we discuss these two decay scenarios in detail and show their detection sensitivity based on the mass of the doubly charged Higgs.展开更多
基金supported by the National Key Research and Development Program of China(No.2022YFA1602200)the National Natural Science Foundation of China(Nos.12341501 and 12405174)the Hefei Comprehensive National Science Center for the strong support on the STCF key technology research project.
文摘Electron-positron colliders operating in the GeV center-of-mass range,or tau-charm energy region,have been proved to enable competitive frontier research due to several unique features.With the progress of high-energy physics in the last two decades,a new-generation Tau-Charm factory,called the Super Tau-Charm Facility(STCF),has been actively promoted by the particle physics community in China.STCF has the potential to address fundamental questions such as the essence of color confinement and the matter-antimatter asymmetry within the next decades.The main design goals of the STCF are a center-of-mass energy ranging from 2 to 7 GeV and a luminosity surpassing 5×10^(34)cm^(−2)s^(−1)that is optimized at a center-of-mass energy of 4 GeV,which is approximately 50 times that of the currently operating Tau-Charm factory-BEPCII.The STCF accelerator has two main parts:a double-ring collider with a crab-waist collision scheme and an injector that provides top-up injections for both electron and positron beams.As a typical third-generation electron-positron circular collider,the STCF accelerator faces many challenges in both accelerator physics and technology.In this paper,the conceptual design of the STCF accelerator complex is presented,including the ongoing efforts and plans for technological research and develop-ment,as well as the required infrastructure.The STCF project aims to secure support from the Chinese central government for its construction during the 15th Five-Year Plan(2026-2030).
基金Supported in part by National Natural Science Foundation of China(11605075,11635009)Natural Science Foundation of Shandong Province(ZR2017JL006,ZR2021QA040)。
文摘The Higgs sector of the standard model can be extended by introducing an SU(2)_(L) Higgs tripletΔto generate tiny neutrino masses in the framework of the type-Ⅱseesaw mechanism.In this paper,we study the pair production of the introduced Higgs triplet at future e-p colliders.The corresponding production cross sections via the vector boson fusion process at the FCC-ep and ILC■FCC are predicted,where the production of a pair of doubly charged Higgs is found to be dominant and then used to investigate the collider phenomenology of the Higgs triplet.Depending on the size of the Higgs triplet vacuum expectation value,the doubly charged Higgs may decay into a pair of same-sign charged leptons or a pair of same-sign W bosons.To explore the discovery potential of the doubly charged Higgs at future e-p colliders,we discuss these two decay scenarios in detail and show their detection sensitivity based on the mass of the doubly charged Higgs.
