skip to main content


Title: Implications of a light “dark Higgs” solution to the g μ - 2 discrepancy

A light scalar Φ with mass ≲1 GeV and muonic coupling O(10 -3) would explain the 3.5σ discrepancy between the Standard Model (SM) muon g-2 prediction and experiment. Such a scalar can be associated with a light remnant of the Higgs mechanism in the “dark” sector. We suggest Φ→l +l - bump hunting in μ→eν$$\vec{v}$$Φ, μ-p→ν μnΦ (muon capture), and K ±→μ ±νΦ decays as direct probes of this scenario. In a general setup, a potentially observable muon electric dipole moment ≲10 -23 e cm and lepton-flavor-violating decays τ→μ(e)Φ or μ→eΦ can also arise. A deviation in BR(H→μ +μ -) from SM expectations, due to Higgs coupling misalignment, can result depending on certain parameters. Here, we illustrate how the requisite interactions can be mediated by weak-scale vector-like leptons that typically lie within the reach of future LHC measurements.
 [1] ;  [2] ;  [2] ;  [2]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. of Victoria, BC (Canada); Perimeter Inst. for Theoretical Physics, Waterloo, ON (Canada)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Report Number(s):
Journal ID: ISSN 2470-0010; PRVDAQ; KA2401012
Grant/Contract Number:
SC00112704; SC0012704
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 93; Journal Issue: 3; Journal ID: ISSN 2470-0010
American Physical Society (APS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; higgs; HEP; dark matter; scalar; SM; muon; g-2
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1237120