Search for heavy narrow dilepton resonances in pp collisions at √s = 7 TeV and √s = 8 TeV

Chatrchyan, S. and Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Aguilo, E. and Bergauer, T. and Dragicevic, M. and Eroe, J. and Fabjan, C. and Friedl, M. and Fruehwirth, R. and Ghete, V. M. and Hoermann, N. and Hrubec, J. and Jeitler, M. and Kiesenhofer, W. and Knuenz, V. and Krammer, M. and Kraetschmer, I. and Liko, D. and Mikulec, I. and Pernicka, M. and Rabady, D. and Rahbaran, B. and Rohringer, C. and Rohringer, H. and Schoefbeck, R. and Strauss, J. and Taurok, A. 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 Raics, Péter and Trócsányi, Zoltán and Ujvári, Balázs and Veres, Gábor and Krajczár, Krisztián (2013) Search for heavy narrow dilepton resonances in pp collisions at √s = 7 TeV and √s = 8 TeV. PHYSICS LETTERS B, 720 (1-3). pp. 63-82. ISSN 0370-2693

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Abstract

An updated search for heavy narrow resonances decaying to muon or electron pairs using the CMS detector is presented. Data samples from pp collisions at √s = 7 TeV and 8 TeV at the LHC, with integrated luminosities of up to 5.3 and 4.1 fb−1, respec- tively, are combined. No evidence for a heavy narrow resonance is observed. The analysis of the combined data sets excludes, at 95% confidence level, a Sequential Standard Model Z′ SSM resonance lighter than 2590 GeV, a superstring-inspired Z′ ψ lighter than 2260 GeV, and Kaluza–Klein gravitons lighter than 2390 (2030) GeV, as- suming that the coupling parameter k/MPl is 0.10 (0.05). These are the most stringent limits to date.

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