Search for new phenomena in dijet events with ATLAS detector at LHC.

Francescato S.
  Lunedì 11/09   14:30 - 18:30   Aula A208   I - Fisica nucleare e subnucleare
Dijet events are studied in proton-proton collisions recorded by ATLAS during 2015 and 2016 at the centre-of-mass energy of 13 TeV. This represents a substantial extension of the first LHC Run 2 result. The invariant mass and angular distribution are analyzed and compared to Standard Model background predictions seeking for evidence of new physics signals over the dominant QCD contribution. A new data-driven background fitting technique has been deployed to improve dijet invariant mass background prediction. Information from the dijet angular correlations has been deployed to improve the sensitivity towards broad resonances. Results are interpreted in the context of Standard Model extensions predicting both resonant and non resonant effects such as excited quarks, quantum black holes, additional or excited vector bosons and contact interaction, improving the reach of previously published results.