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Published April 1, 2016 | Published + Accepted Version
Journal Article Open

Rays of light from the LHC

Abstract

We consider models for the di-photon resonance observed at ATLAS (with 3.6 fb^(−1)) and CMS (with 2.6 fb^(−1)). We find there is no conflict between the signal reported at 13 TeV and the constraints from both experiments at 8 TeV with 20.3 fb^(−1). We make a simple argument for why the decay to the γγ mode must be generated by additional, beyond the standard model (SM) states. We explore four viable options: (i) resonance production and decay through loops of messenger fermions or scalars, (ii) a resonant messenger which decays to the di-photon resonance + X, (iii) an edge configuration where A → Bγ → Cγγ, and (iv) Hidden Valley-like models where the resonance decays to a pair of very light (sub-GeV) states, each of which in turn decays to a pair of collimated photons that cannot be distinguished from a single photon. Since in each case multiple new states have been introduced, a wealth of signatures is expected to ensue at run 2 of the LHC.

Additional Information

© 2016 American Physical Society. (Received 12 February 2016; published 13 April 2016) We thank Zoltan Ligeti, Yasunori Nomura, Surjeet Rajendran and Dean Robinson for discussions. The work of S. K. and M. P. is supported in part by the LDRD program of LBNL under U.S. Department of Energy Contract No. DE-AC02-05CH11231. T. M. and K. Z. are supported by U.S. DOE Grant No. DE-AC02-05CH11231. T. M. also acknowledges computational resources provided through ERC Grant No. 291377: "LHCtheory."

Attached Files

Published - PhysRevD.93.075020.pdf

Accepted Version - 1512.04928.pdf

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