Search for new phenomena in the dijet mass distribution using $p-p$ collision data at $\sqrt{s}=8$ TeV with the ATLAS detector

TL;DR

This study analyzes 8 TeV proton-proton collision data from the ATLAS detector to search for new phenomena in the dijet mass spectrum, setting limits on various hypothetical particles and phenomena.

Contribution

First comprehensive search for new phenomena in the dijet mass spectrum at 8 TeV using the full 2012 ATLAS dataset, establishing exclusion limits on multiple models.

Findings

No resonance-like features observed in the dijet mass spectrum.

Excludes excited quarks below 4.09 TeV and other new particles below specified mass thresholds.

Abstract

Dijet events produced in LHC proton--proton collisions at a center-of-mass energy $\sqrt{s}=8$ TeV are studied with the ATLAS detector using the full 2012 data set, with an integrated luminosity of 20.3 fb$^{-1}$. Dijet masses up to about 4.5 TeV are probed. No resonance-like features are observed in the dijet mass spectrum. Limits on the cross section times acceptance are set at the 95% credibility level for various hypotheses of new phenomena in terms of mass or energy scale, as appropriate. This analysis excludes excited quarks with a mass below 4.09 TeV, color-octet scalars with a mass below 2.72 TeV, heavy $W'$ bosons with a mass below 2.45 TeV, chiral ${W^\ast}$ bosons with a mass below 1.75 TeV, and quantum black holes with six extra space-time dimensions with threshold mass below 5.82 TeV.