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Abstract
If the 750 GeV resonance in the diphoton channel is confirmed, what are the measurements necessary to infer the properties of the new particle and understand its nature? We address this question in the framework of a single new scalar particle, called digamma ($\digamma$). We describe it by an effective field theory, which allows us to obtain general and model-independent results, and to identify the most useful observables, whose relevance will remain also in model-by-model analyses. We derive full expressions for the leading-order processes and compute rates for higher-order decays, digamma production in association with jets, gauge or Higgs bosons, and digamma pair production. We illustrate how measurements of these higher-order processes can be used to extract couplings, quantum numbers, and properties of the new particle.
Highlights
Preliminary LHC data at √s = 13 TeV show a hint for a new resonance in pp → γγ at invariant mass of 750 GeV [1, 2], which stimulated intense experimental and theoretical interest
If the 750 GeV resonance in the diphoton channel is confirmed, what are the measurements necessary to infer the properties of the new particle and understand its nature? We address this question in the framework of a single new scalar particle, called digamma ( )
We briefly summarise the experimental status, updating the results of [7] in light of the new pp → → γγ results presented at the Moriond 2016 conference [3,4,5,6], which increase the statistical significance of the excess around mγγ ≈ 750 GeV
Summary
Preliminary LHC data at √s = 13 TeV show a hint for a new resonance in pp → γγ (thereby denoted by the letter digamma, ) at invariant mass of 750 GeV [1, 2], which stimulated intense experimental and theoretical interest. Many key issues related to the new resonance remain obscure.
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