Search for Quark Compositeness with the Dijet Centrality Ratio in pp Collisions at {radical}(s)=7 TeV

Journal Article · Fri Dec 31 00:00:00 EST 2010 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.105.262001· OSTI ID:21554496

Khachatryan, V; Sirunyan, A M; Tumasyan, A ^[1]; Adam, W; Bergauer, T; Dragicevic, M; Eroe, J; Fabjan, C; Friedl, M; Fruehwirth, R; Ghete, V M; Hammer, J; Haensel, S; Hartl, C; Hoch, M; Hoermann, N; Hrubec, J; Jeitler, M; Kasieczka, G; Kiesenhofer, W ^[2]

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1. Yerevan Physics Institute, Yerevan (Armenia)
2. Institut fuer Hochenergiephysik der OeAW, Wien (Austria)

A search for quark compositeness in the form of quark contact interactions, based on hadronic jet pairs (dijets) produced in proton-proton collisions at {radical}(s)=7 TeV, is described. The data sample of the study corresponds to an integrated luminosity of 2.9 pb{sup -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.

• OSTI ID: 21554496
• Journal Information: Physical Review Letters, Vol. 105, Issue 26; Other Information: DOI: 10.1103/PhysRevLett.105.262001; (c) 2010 American Institute of Physics; ISSN 0031-9007
• Country of Publication: United States
• Language: English

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