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Search for Quark Compositeness with the Dijet Centrality Ratio in pp Collisions at s√=7 TeV
Baringer, Philip S. Bean, Alice Benelli, Gabriele Grachov, Oleg A. Murray, Michael J. Noonan, Danny Radicci, Valeria Sanders, Stephen J. Wood, Jeffrey Scott Zhukova, Victoria
Baringer, Philip S.
Bean, Alice
Benelli, Gabriele
Grachov, Oleg A.
Murray, Michael J.
Noonan, Danny
Radicci, Valeria
Sanders, Stephen J.
Wood, Jeffrey Scott
Zhukova, Victoria
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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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This is the publisher's version, also available electronically from http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.105.262001.
Date
2010-12-20
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American Physical Society
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Citation
V. 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.