Paper of the Week


Search for excited quarks in the γ + jet final state in proton–proton collisions at s^1/2 = 8 Tev

Physics Letters B 738, 274 (2014)

Baringer*, P., Bean*, A., Benelli*, G., Bruner*, C., Gray*, J., Kenny*, R. P., III, Malek*, M., Murray*, M., Noonan*, D., Sanders*, S., Sekaric*, J., Stringer*, R., Wang*, Q., Wood*, J. S., CMS Collaboration
* KU Physics and Astronomy Authors

ABSTRACT

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−1 collected by the CMS experiment in proton–proton collisions at s^1/2 = 8 TeV at the LHC. Events with photons and jets with high transverse momenta are selected and the γ+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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