Baringer, Philip S.Bean, AliceBenelli, GabrieleGrachov, Oleg A.Murray, Michael J.Noonan, DannyRadicci, ValeriaSanders, Stephen J.Wood, Jeffrey ScottZhukova, VictoriaKhachatryan, V.Sirunyan, A. M.Tumasyan, A.Adam, W.2014-11-052014-11-052010-12-20V. Khachatryan et al. (CMS Collaboration). (2010). "Search for Quark Compositeness with the Dijet Centrality Ratio in pp Collisions at s√=7  TeV." Physical Review Letters, 105(26):262001. http://dx.doi.org/10.1103/PhysRevLett.105.262001.0031-9007https://hdl.handle.net/1808/15620This is the publisher's version, also available electronically from http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.105.262001.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.Article10.1103/PhysRevLett.105.262001https://orcid.org/0000-0002-3932-3769openAccess