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. 2010 Dec 31;105(26):262001.
doi: 10.1103/PhysRevLett.105.262001. Epub 2010 Dec 20.

Search for quark compositeness with the dijet centrality ratio in pp collisions at √s=7 TeV

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Search for quark compositeness with the dijet centrality ratio in pp collisions at √s=7 TeV

V Khachatryan et al. Phys Rev Lett. .

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.

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