Cracking Down on Fake Photons - A Case of 750 GeV Diphoton Resonance -

Understand

Among various models to explain the $750$ GeV diphoton resonance hinted at the LHC Run 2, a class of models where the resonance decays not into a pair of photons but into a pair of photon-jets is gathering definite attention.

• In this paper, we study how well we can distinguish the di-photon-jet resonance from the diphoton resonance by examining detector responses to the photon-jets.
• We find that the sum of $p_T$ of the first $e^+e^-$ pair from the photon conversion provides strong discrimination power.
• We also discuss determination of the lifetime of the light intermediate particle by measuring the photon conversion points.