Abstract
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 M s ≃ 7-104 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.
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Ibáñez, L.E., Martín-Lozano, V. A megaxion at 750 GeV as a first hint of low scale string theory. J. High Energ. Phys. 2016, 21 (2016). https://doi.org/10.1007/JHEP07(2016)021
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DOI: https://doi.org/10.1007/JHEP07(2016)021