The 28 GeV dimuon excess in lepton specific THDM

Cici A., Khalil S., Nis B., ÜN C. S.

NUCLEAR PHYSICS B, vol.977, 2022 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 977
  • Publication Date: 2022
  • Doi Number: 10.1016/j.nuclphysb.2022.115728
  • Journal Name: NUCLEAR PHYSICS B
  • Journal Indexes: Science Citation Index Expanded, Scopus, Academic Search Premier, Chemical Abstracts Core, INSPEC, zbMATH, Directory of Open Access Journals


We explore the Higgs mass spectrum in a class of Two Higgs Doublet Models (THDMs) in which a scalar SU (2)(L) doublet interacts only with quarks, while the second one interacts only with leptons. The spectrum includes two CP-even Higgs bosons, either of which can account for the SM-like Higgs boson, and the spectra involving light Higgs bosons receive strong impacts from the LEP results and the current collider analyses. We find that a consistent spectrum can involve a CP-odd Higgs boson as light as about 10 GeV, while the lightest CP-even Higgs boson cannot be lighter than about 55 GeV when m(A )~& nbsp;28 GeV. These analyses can rather bound the low tan beta region which can also accommodate an observed excess in dimuon events at m(mu mu) ~28 GeV. A lepton-specific class of THDMs (LS-THDM) can predict such an excess through A -> mu mu decays, while the solutions can be constrained by the A ->& nbsp;tau tau mode. After constraining the solutions with the consistent ranges of sigma(pp & nbsp;-> bbA -> bb tau tau), a largest excess at about 1.5 sigma at 8 TeV center of mass (COM) energy and 2 sigma at 13 TeV COM is observed for tan beta ~& nbsp;12 and m(A) ~& nbsp;28 GeV in the sigma(pp -> bbA -> bb mu mu) events. (C) 2022 The Author(s). Published by Elsevier B.V.& nbsp;