title: Gluons to Diphotons via New Particles with Half the Signal's Invariant Mass.
abstract: Any new particle charged under SU(3)_{C} and carrying an electric charge will leave an imprint in the diphoton invariant mass spectrum, as it can mediate the gg→γγ process through loops. The combination of properties of loop functions, threshold resummation, and gluon parton distribution functions can result in a peaklike feature in the diphoton invariant mass around twice the mass of a given particle even if the particle is short lived, and thus it does not form a narrow bound state. Using a recent ATLAS analysis, we set upper limits on the combined SU(3)_{C} and electric charge of new particles and indicate future prospects. We also discuss the possibility that the excess of events in the diphoton invariant mass spectrum around 750 GeV originates from loops of a particle with a mass of around 375 GeV.
authors.affiliation: Department of Physics and Astronomy and Center for Theoretical Physics, Seoul National University, Seoul 151-747, Korea.
authors.forename: Dongjin
authors.initials: D
authors.lastname: Chway
authors.affiliation: Department of Physics and Astronomy and Center for Theoretical Physics, Seoul National University, Seoul 151-747, Korea.|Physics Department, Indiana University, Bloomington, Indiana 47405, USA.
authors.forename: Radovan
authors.initials: R
authors.lastname: Dermíšek
authors.affiliation: Department of Physics and Astronomy and Center for Theoretical Physics, Seoul National University, Seoul 151-747, Korea.
authors.forename: Tae Hyun
authors.initials: TH
authors.lastname: Jung
authors.affiliation: Department of Physics and Astronomy and Center for Theoretical Physics, Seoul National University, Seoul 151-747, Korea.
authors.forename: Hyung Do
authors.initials: HD
authors.lastname: Kim