First Measurement of Hadronic Event Shapes in pp Collisions at sqrt(s)=7 TeV

TL;DR

This paper reports the first measurement of hadronic event shapes in proton-proton collisions at 7 TeV, using CMS data, and compares the results with various QCD models to test their accuracy.

Contribution

It provides the initial measurement of hadronic event shapes at 7 TeV and evaluates the performance of five QCD multijet production models.

Findings

Event-shape distributions match some models within uncertainties

Data constrains QCD multijet production models

Results improve understanding of hadronic event structure

Abstract

Hadronic event shapes have been measured in proton-proton collisions at sqrt(s)=7 TeV, with a data sample collected with the CMS detector at the LHC. The sample corresponds to an integrated luminosity of 3.2 inverse picobarns. Event-shape distributions, corrected for detector response, are compared with five models of QCD multijet production.