Doubly charged Higgs bosons appear in left-right symmetric models and in Higgs triplet models. Current searches assume the H^++/-- decay branching ratio to like-sign muons to be 100%. Details of the analysis can be found in D0 note 4217.

Muon ID and analysis requirements

• Make data quality requirements based on official good run lists
• Select di-muon trigger events
  
• Have muon identification requirements based on:
  
  • Track segments reconstructed in the muon system, isolation from signficant energy deposition in the calorimeter and an associated track from the central tracking system. The muon momentum is taken as the central track momentum

• Muons are required to have p_T > 15 GeV and |eta| < 2

Dimuon mass spectra at various steps of the event selection procedure
(.eps version)

Confidence level of the signal as a function of the H⁺⁺ mass,
for the left- and right-handed Higgs bosons
(.eps version)