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

Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Bergauer, T. and Dragicevic, M. and Erö, J. and Fabjan, C. and Friedl, M. and Frühwirth, R. and Ghete, V. M. and Hartl, C. and Hörmann, N. and Hrubec, J. and Jeitler, M. and Kiesenhofer, W. and Knünz, V. and Krammer, M. and Krätschmer, I. and Liko, D. and Mikulec, I. and Rabady, D. and Rahbaran, B. and Rohringer, H. and Schöfbeck, R. and Strauss, J. and Taurok, A. and Treberer-Treberspurg, W. and Waltenberger, W. and Wulz, C.-E. and Filipovic, Nicolas and Bencze, György and Hajdu, Csaba and Hidas, Pál and Horváth, Dezső and Siklér, Ferenc and Veszprémi, Viktor and Vesztergombi, György and Zsigmond, Anna Júlia and Béni, Noémi Tekla and Karancsi, János and Molnár, József and Pálinkás, József and Szillási, Zoltán and Raics, Péter and Trócsányi, Zoltán and Ujvári, Balázs and Veres, Gábor (2014) Search for excited quarks in the γ + jet final state in proton-proton collisions at √s = 8 TeV. PHYSICS LETTERS B, 738. pp. 274-293. ISSN 0370-2693

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Abstract

A search for excited quarks decaying into the γ + jet final state is presented. The anal- ysis 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 = 8 TeV at the LHC. Events with photons and jets with high transverse momenta are selected and the γ + jet in- variant mass distribution is studied to search for a resonance peak. The 95% confi- dence 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 pre- sented 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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