Search for new physics in events with high jet multiplicity and low missing transverse momentum in proton-proton collisions at sqrt(s) = 8 TeV

TL;DR

This study searches for new physics in high-multiplicity jet events with low missing transverse momentum using 8 TeV proton-proton collision data, setting limits on various hypothetical particles and models.

Contribution

It provides the first experimental constraints on coloron and axigluon models in multijet final states at the LHC.

Findings

Excluded coloron masses between 0.6 and 0.75 TeV

Excluded axigluon masses up to 1.15 TeV

Set limits on gluinos in R-parity violating SUSY scenarios from 0.6 to 1.1 TeV

Abstract

A dedicated search is presented for new phenomena in inclusive eight- and ten-jet final states with low missing transverse momentum, with and without identification of jets originating from b quarks. The analysis is based on data from proton-proton collisions corresponding to an integrated luminosity of 19.6 inverse femtobarns collected with the CMS detector at the LHC at sqrt(s) = 8 TeV. The dominant multijet background expectations are obtained from low jet multiplicity control samples. Data agree well with the standard model background predictions, and limits are set in several benchmark models. Colorons (axigluons) with masses between 0.6 and 0.75 (up to 1.15) TeV are excluded at 95% confidence level. Similar exclusion limits for gluinos in R-parity violating supersymmetric scenarios are from 0.6 up to 1.1 TeV. These results comprise the first experimental probe of the coloron and axigluon models in multijet final states.