Measurement of dijet angular distributions at sqrt{s}=1.96TeV and searches for quark compositeness and extra spatial dimensions

TL;DR

This paper reports the first measurement of dijet angular distributions at the Tevatron, confirming QCD predictions and setting new limits on quark compositeness and extra dimensions.

Contribution

It provides the first measurement of dijet angular distributions at 1.96 TeV and sets the most stringent limits on new physics models to date.

Findings

Data agrees with perturbative QCD predictions.

Sets new limits on quark compositeness.

Constrains models with extra spatial dimensions.

Abstract

We present the first measurement of dijet angular distributions in ppbar collisions at sqrt{s}=1.96TeV at the Fermilab Tevatron Collider. The measurement is based on a dataset corresponding to an integrated luminosity of up to 0.7fb-1 collected with the D0 detector. Dijet angular distributions have been measured over a range of dijet masses, from 0.25TeV to above 1.1TeV. The data are in good agreement with the predictions of perturbative QCD and are used to constrain new physics models including quark compositeness, large extra dimensions, and TeV-1 scale extra dimensions. For all models we set the most stringent direct limits to date.