Search for New Particles in 2-Jet Final States in 7 TeV Proton-Proton Collisions with the ATLAS Detector at the LHC

TL;DR

This paper reports a search for new heavy particles in two-jet final states using 7 TeV proton-proton collision data from the ATLAS detector, setting limits on excited-quark production and extending previous mass exclusion ranges.

Contribution

It presents the first search for excited-quark resonances in 2-jet final states at 7 TeV with the ATLAS detector, setting new exclusion limits.

Findings

No resonances observed in the data.

Excluded excited-quark masses between 0.30 and 1.26 TeV at 95% CL.

Extended the mass exclusion range beyond previous experiments.

Abstract

A search for new heavy particles manifested as resonances in two-jet final states is presented. The data were produced in root(s) = 7 TeV proton-proton collisions by the Large Hadron Collider (LHC) and correspond to an integrated luminosity of 315 nb^-1 collected by the ATLAS detector. No resonances were observed. Upper limits were set on the product of cross section and signal acceptance for excited-quark (q*) production as a function of q* mass. These exclude at the 95% CL the q* mass interval 0.30 < m(q*) < 1.26 TeV, extending the reach of previous experiments.