Search for excited quarks in the γ + jet final state in proton-proton collisions at √s = 8 TeV

Search for excited quarks in the γ + jet final state in proton-proton collisions at √s = 8 TeV

A search for excited quarks decaying into the γ+jet final state is presented. The analysis is based on data corresponding to an integrated luminosity of 19.7 fb[superscript −1] collected by the CMS experiment in proton–proton collisions at √s = 8 TeV at the LHC. Events with photons and jets with hig...

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Bibliographic Details
Main Authors: Apyan, Aram, Busza, Wit, Cali, Ivan Amos, Chan, M., Di Matteo, Leonardo, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Gulhan, Doga Can, Klute, Markus, Lai, Yue Shi, Ma, Teng, Paus, Christoph M. E., Ralph, Duncan Kelley, Stephans, George S. F., Velicanu, Dragos Alexandru, Veverka, Jan, Wyslouch, Boleslaw, Zanetti, Marco, Levin, Andrew Michael, Roland, Gunther M, Stoeckli, Fabian, Yang, Mingming, Wyslouch, Victoria, Bauer, Gerry P, Dutta, Valentina, Lee, Yen-Jie, Luckey Jr, P David, Roland, Christof E, Sumorok, Konstanty C, Barbieri, Richard Alexander
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:en_US
Published: Elsevier 2015
Online Access:http://hdl.handle.net/1721.1/92577
https://orcid.org/0000-0002-3831-9071
https://orcid.org/0000-0003-3106-4894
https://orcid.org/0000-0001-6332-5839
https://orcid.org/0000-0001-8983-2169
https://orcid.org/0000-0002-1260-777X
https://orcid.org/0000-0002-9418-6656
https://orcid.org/0000-0002-6047-4211
https://orcid.org/0000-0002-7945-005X
https://orcid.org/0000-0003-3681-0649
https://orcid.org/0000-0003-1486-606X
https://orcid.org/0000-0003-2593-7767
https://orcid.org/0000-0001-9236-6621
https://orcid.org/0000-0002-0869-5631
https://orcid.org/0000-0002-1136-6900
Description
Summary:A search for excited quarks decaying into the γ+jet final state is presented. The analysis is based on data corresponding to an integrated luminosity of 19.7 fb[superscript −1] collected by the CMS experiment in proton–proton collisions at √s = 8 TeV at the LHC. Events with photons and jets with high transverse momenta are selected and the γ+jetγ+jet invariant mass distribution is studied to search for a resonance peak. The 95% confidence level upper limits on the product of cross section and branching fraction are evaluated as a function of the excited quark mass. Limits on excited quarks are presented as a function of their mass and coupling strength; masses below 3.5 TeV are excluded at 95% confidence level for unit couplings to their standard model partners.

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