Seminar detail: Is there 5th force in nature?

Date&Time	Mon Jun 30 2025 (13:00 - 14:00)
Speaker	Kei Yagyu
Affiliation	Tokyo University of Science
Title	Is there 5th force in nature?
Abstract	A fifth force based on a new U(1) gauge symmetry arises in various scenarios of physics beyond the Standard Model, such as grand unification theories and models addressing neutrino masses, dark matter, and the baryon asymmetry of the Universe. A common prediction in these scenarios is the existence of a new gauge boson Z' and a new Higgs boson, making their detection a crucial step toward probing the fifth force. In this talk, we explore the prospects for discovering these new particles at Higgs and Z factories, where characteristic signatures may emerge through decays of the Higgs and Z bosons. We demonstrate that such experiments can probe the Z' boson in a mass range from O(100) MeV to O(10) GeV, and that the results can be translated into meaningful constraints on the model parameters.
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