[NCTS Seminar - Particle Physics Journal Club] Dispersive determination of fourth generation quark masses

  • Event Date: 2023-11-27
  • High energy phenomenology
  • Speaker: Prof. Hsiang-nan Li (Academia Sinica)  /  Host: Dr. Naoki Yamatsu
    Place: R517, New Physics Building, NTU

Title:Dispersive determination of fourth generation quark masses
Time:2023/11/27 (Mon.) 12:30
Place:R517, New Physics Building, NTU

We determine the masses of the sequential fourth generation quarks b′ and t′ in the extension of the Standard Model by solving the dispersion relations associated with the mixing between the neutral states Q\bar q and \bar Qq, Q (q) being a heavy (light) quark. The solutions to the dispersion relations lead to the masses mb′=(2.7\pm 0.1) TeV and mt′=200 TeV unambiguously. We show that these superheavy quarks, forming bound states in a Yukawa potential, barely contribute to Higgs boson production via gluon fusion and decay to photon pairs, and bypass current experimental constraints.