Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A pseudoscalar decaying to photon pairs in the early LHC Run 2 data   In this paper we explore the possibility of a pseudoscalar resonance to
account for the 750 GeV diphoton excess observed both at ATLAS and at CMS. We
analyze the ingredients needed from the low energy perspective to obtain a
sufficiently large diphoton rate to explain the signal while avoiding
constraints from other channels. Additionally, we point out composite Higgs
models in which one can naturally obtain a pseudoscalar at the 750 GeV mass
scale and we estimate the pseudoscalar couplings to standard model particles
that one would have in such models. A generic feature of models that can
explain the excess is the presence of new particles in addition to the 750 GeV
state. Finally, we note that due to the origin of the coupling of the resonance
to photons, one expects to see comparable signals in the $Z\gamma$, $ZZ$, and
$WW$ channels.

37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an