Impact of CP -violating interference effects on MSSM Higgs searches

Elina Fuchs, Georg Weiglein

Research output: Contribution to journalArticlepeer-review


Interference and mixing effects between neutral Higgs bosons in the MSSM with complex parameters are shown to have a significant impact on the interpretation of LHC searches for additional Higgs bosons. Complex MSSM parameters introduce mixing between the CP-even and CP-odd Higgs states h, H, A into the mass eigenstates h1, h2, h3 and generate CP-violating interference terms. Both effects are enhanced in the case of almost degenerate states. Employing as an example an extension of a frequently used benchmark scenario by a non-zero phase ϕAt, the interference contributions are obtained for the production of neutral Higgs bosons in gluon-fusion and in association with b-quarks followed by the decay into a pair of τ-leptons. While the resonant mixing increases the individual cross sections for the two heavy Higgs bosons h2 and h3, strongly destructive interference effects between the contributions involving h2 and h3 leave a considerable parameter region unexcluded that would appear to be ruled out if the interference effects were neglected.

Original languageEnglish
Article number87
Number of pages19
JournalEuropean Physical Journal C
Issue number2
StatePublished Online - 30 Jan 2018

All Science Journal Classification (ASJC) codes

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)


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