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 low-energy antineutrino-and neutrino-nucleon neutral current elastic scattering is studied within the framework of the relativistic SU(2)baryon chiral perturbation theory up to the order of O(p^(3)).We have derive...The low-energy antineutrino-and neutrino-nucleon neutral current elastic scattering is studied within the framework of the relativistic SU(2)baryon chiral perturbation theory up to the order of O(p^(3)).We have derived the model-independent hadronic amplitudes and extracted the form factors from them.It is found that differential cross sections do/dQ^(2) for the processes of(anti)neutrino-proton scattering are in good agreement with the existing MiniBooNE data in the Q^(2) region[0.13,0.20]GeV^(2),where nuclear effects are expected to be negligible.For Q^(2)≤0.13 GeV^(2),large deviation is observed,which is mainly owing to the sizeable Pauli blocking effect.Comparisons with the simulation data produced by the NuWro and GENIE Mento Carlo events generators are also discussed.The chiral results obtained in this work can be utilized as inputs in various nuclear models to achieve the goal of precise determination of the strangeness axial vector form factor,in particular when the low-energy MicroBooNE data are available in the near future.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).
文摘The low-energy antineutrino-and neutrino-nucleon neutral current elastic scattering is studied within the framework of the relativistic SU(2)baryon chiral perturbation theory up to the order of O(p^(3)).We have derived the model-independent hadronic amplitudes and extracted the form factors from them.It is found that differential cross sections do/dQ^(2) for the processes of(anti)neutrino-proton scattering are in good agreement with the existing MiniBooNE data in the Q^(2) region[0.13,0.20]GeV^(2),where nuclear effects are expected to be negligible.For Q^(2)≤0.13 GeV^(2),large deviation is observed,which is mainly owing to the sizeable Pauli blocking effect.Comparisons with the simulation data produced by the NuWro and GENIE Mento Carlo events generators are also discussed.The chiral results obtained in this work can be utilized as inputs in various nuclear models to achieve the goal of precise determination of the strangeness axial vector form factor,in particular when the low-energy MicroBooNE data are available in the near future.
