Implications of the Upper Bound on h →μ+μ- On the Baryon Asymmetry of the Universe

Elina Fuchs, Marta Losada, Yosef Nir, Yehonatan Viernik

Research output: Contribution to journalArticlepeer-review


The upper bounds from the ATLAS and CMS experiments on the decay rate of the Higgs boson to two muons provide the strongest constraint on an imaginary part of the muon Yukawa coupling. This bound is more than an order of magnitude stronger than bounds from CP-violating observables, specifically the electric dipole moment of the electron. It excludes a scenario - which had been viable prior to these measurements - that a complex muon Yukawa coupling is the dominant source of the baryon asymmetry. Even with this bound, the muon source can still contribute O(16%) of the asymmetry.

Original languageEnglish (US)
Article number181801
JournalPhysical Review Letters
Issue number18
StatePublished - May 8 2020

ASJC Scopus subject areas

  • General Physics and Astronomy


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