Title
Search for quark compositeness with the dijet centrality ratio in pp collisions at <tex>$\sqrt{s}$</tex> = 7 TeV Search for quark compositeness with the dijet centrality ratio in pp collisions at <tex>$\sqrt{s}$</tex> = 7 TeV
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
New York, N.Y. ,
Subject
Physics
Source (journal)
Physical review letters. - New York, N.Y.
Volume/pages
105(2010) :26 , p. 1-15
ISSN
0031-9007
ISI
000286754700004
Carrier
E-only publicatie
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
A search for quark compositeness in the form of quark contact interactions, based on hadronic jet pairs (dijets) produced in proton-proton collisions at √s=7  TeV, is described. The data sample of the study corresponds to an integrated luminosity of 2.9  pb-1 collected with the CMS detector at the LHC. The dijet centrality ratio, which quantifies the angular distribution of the dijets, is measured as a function of the invariant mass of the dijet system and is found to agree with the predictions of the standard model. A statistical analysis of the data provides a lower limit on the energy scale of quark contact interactions. The sensitivity of the analysis is such that the expected limit is 2.9 TeV; because the observed value of the centrality ratio at high invariant mass is below the expectation, the observed limit is 4.0 TeV at the 95% confidence level.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/6fe272/f2119bc3.pdf
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