A Megaxion at 750 GeV as a First Hint of Low Scale String Theory

Dec 29, 2015
25 pages
Published in:
  • JHEP 07 (2016) 021
  • Published: Jul 5, 2016
e-Print:
Report number:
  • IFT-UAM-CSIC-15-141,
  • FTUAM-15-45

Citations per year

201520162017201826041
Abstract: (Springer)
Low scale string models naturally have axion-like pseudoscalars which couple directly to gluons and photons (but not W ’s) at tree level. We show how they typically get tree level masses in the presence of closed string fluxes , consistent with the axion discrete gauge symmetry, in a way akin of the axion monodromy of string inflation and relaxion models. We discuss the possibility that the hints for a resonance at 750 GeV recently reported at ATLAS and CMS could correspond to such a heavy axion state (megaxion). Adjusting the production rate and branching ratios suggest the string scale to be of order Ms_{s} ≃ 7-104^{4} TeV, depending on the compactification geometry. If this interpretation was correct, one extra Z’ gauge boson could be produced before reaching the string threshold at LHC and future colliders.
Note:
  • 26 pages, 3 figures, 1 Megaxion
  • Strings and branes phenomenology
  • string: closed
  • symmetry: discrete
  • tree approximation
  • compactification
  • branching ratio
  • inflation
  • monodromy
  • energy: low
  • axion-like particles