Implications of the Upper Bound on h→μ^{+}μ^{-} on the Baryon Asymmetry of the Universe

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...

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Bibliographic Details
Published in:Physical review letters 2020-05, Vol.124 (18), p.181801-181801, Article 181801
Main Authors: Fuchs, Elina, Losada, Marta, Nir, Yosef, Viernik, Yehonatan
Format: Article
Language:English
Subjects:
Asymmetry
baryogenesis & leptogenesis
Baryons
branching fraction
cosmology
Coupling
Decay rate
Dipole moments
effective field theory
Electric dipoles
electric moment
extensions of Higgs sector
finite temperature field theory
Higgs bosons
Muons
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
rare decays
Upper bounds
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.124.181801