Diphoton Signatures from Heavy Axion Decays at the CERN Large Hadron Collider

Apostolos Pilaftsis

doi:10.1103/PhysRevD.93.015017

paper

Diphoton Signatures from Heavy Axion Decays at the CERN Large Hadron Collider

arXiv:1512.04931 · doi:10.1103/PhysRevD.93.015017

Abstract

Recently, the LHC collaborations, ATLAS and CMS, have announced an excess in the diphoton channel with local significance of about $3 σ$ around an invariant mass distribution of $\sim 750$ GeV, after analyzing new data collected at centre-of-mass energies of $s = 13 TeV$ . We present a possible physical interpretation of such a signature, within the framework of a minimal UV-complete model with a massive singlet pseudo-scalar state $a$ that couples to a new TeV-scale coloured vector-like fermion $F$ , whose hypercharge quantum number is a non-zero integer. The pseudo-scalar state $a$ might be a heavy pseudo-Goldstone boson, such as a heavy axion, which decays into two photons and whose mass lies around the excess region. The mass of the CP-odd state $a$ and its coupling to $F$ may be due to non-perturbative effects, which can break the original Goldstone shift symmetry dynamically. The possible role that the heavy axion $a$ can play in the radiative generation of a seesaw Majorana scale and in the solution to the so-called strong CP problem is briefly discussed.

4 pages, 1 figure, minor rewordings, PRD format

Diphoton Signatures from Heavy Axion Decays at the CERN Large Hadron Collider

Abstract

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