Search for Quark Compositeness with the Dijet Centrality Ratio in pp Collisions at [square root of] s=7  TeV

Search for Quark Compositeness with the Dijet Centrality Ratio in pp Collisions at [square root of] s=7  TeV

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  [square root of s=7] TeV, is described. The data sample of the study corresponds to an integrated luminosity of 2.9  pb-1 [pb superscript -1]...

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Bibliographic Details
Main Authors: Alver, Burak Han, Bendavid, Joshua L., Busza, Wit, Butz, Erik M., Cali, Ivan Amos, Chan, M., Dutta, Valentina, Everaerts, Pieter Bruno Bart, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Hahn, Kristian Allan, Harris, Philip Coleman, Klute, Markus, Lee, Yen-Jie, Lopez, Jeremy Paul, Ma, Teng, Nahn, Steven, Paus, Christoph M. E., Rudolph, Matthew Scott, Stephans, George S. F., Sung, Kevin Kai Hong, Wenger, Edward Allen, Xie, Si, Yang, Mingming, Yilmaz, Yetkin, Zanetti, Marco, Kim, Y., Li, W., Loizides, Constantinos, Luckey Jr, P David, Roland, Christof E, Roland, Gunther M, Sumorok, Konstanty C, Yoon, A. S., Bauer, Gerry P
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:en_US
Published: American Physical Society 2011
Online Access:http://hdl.handle.net/1721.1/64822
https://orcid.org/0000-0002-3831-9071
https://orcid.org/0000-0003-3226-787X
https://orcid.org/0000-0003-3106-4894
https://orcid.org/0000-0001-6332-5839
https://orcid.org/0000-0001-8983-2169
https://orcid.org/0000-0002-6047-4211
https://orcid.org/0000-0003-2593-7767
https://orcid.org/0000-0002-0869-5631
Description
Summary: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  [square root of s=7] TeV, is described. The data sample of the study corresponds to an integrated luminosity of 2.9  pb-1 [pb superscript -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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