Measurement of the production cross section for Zγ → ννγ in pp collisions at √s = 7 TeV and limits on ZZγ and Zγγ triple gauge boson couplings

Chatrchyan, S. and Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Bergauer, T. and Dragicevic, M. and Ero, J. and Fabjan, C. and Friedl, M. and Fruhwirth, R. and Ghete, V. M. and Hormann, N. and Hrubec, J. and Jeitler, M. and Kiesenhofer, W. and Knunz, V. and Krammer, M. and Kratschmer, I. and Liko, D. and Mikulec, I. and Rabady, D. and Rahbaran, B. and Rohringer, C. and Rohringer, H. and Schofbeck, R. and Strauss, J. and Taurok, A. and Treberer-Treberspurg, W. and Waltenberger, W. 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 Molnár, József and Pálinkás, József and Karancsi, János and Trócsányi, Zoltán and Ujvári, Balázs and Krajczár, Krisztián and Veres, Gábor (2013) Measurement of the production cross section for Zγ → ννγ in pp collisions at √s = 7 TeV and limits on ZZγ and Zγγ triple gauge boson couplings. JOURNAL OF HIGH ENERGY PHYSICS (10). ISSN 1126-6708

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Abstract

A measurement of the Zγ → ννγ cross section in pp collisions at √s = 7 TeV is presented, using data corresponding to an integrated luminosity of 5.0 fb−1 collected with the CMS detector. This measurement is based on the observation of events with an imbalance of transverse energy in excess of 130 GeV and a single photon in the absolute pseudorapidity range |η| < 1.4 with transverse energy above 145 GeV. The Zγ → ννγ production cross section is measured to be 21.1 ± 4.2 (stat.) ± 4.3 (syst.) ± 0.5 (lum.) fb, which agrees with the standard model prediction of 21.9 ± 1.1 fb. The results are combined with the CMS measurement of Zγ production in the `+`−γ final state (where ` is an electron or a muon) to yield the most stringent limits to date on triple gauge boson couplings: |hZ 3 | < 2.7 × 10−3, |hZ 4 | < 1.3 × 10−5 for ZZγ and |hγ 3 | < 2.9 × 10−3, |hγ 4 | < 1.5 × 10−5 for Zγγ couplings.

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