Search for physics beyond the standard model in dilepton mass spectra in proton-proton collisions at root s=8 TeV

C. Albajar; V. Khachatryan; M. Missiroli; D. Moran; J. F. Trocóniz; The Collaboration Cms; CMS Collaboration; Abdulla Abdulsalam

doi:10.1007/JHEP04(2015)025

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P. Sloan Foundation Alexander von Humboldt Foundation Belgian Federal Science Policy Office Fonds pour la Formation a la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium) Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium) Ministry of Education, Youth and Sports (MEYS) of the Czech Republic Council of Science and Industrial Research, India HOMING PLUS programme of Foundation for Polish Science European Union Regional Development Fund Compagnia di San Paolo (Torino) Consorzio per la Fisica (Trieste) MIUR (Italy) Thalis programme Aristeia programme EU-ESF Greek NSRF National Priorities Research Program by Qatar National Research Fund Dimuon and dielectron mass spectra, obtained from data resulting from protonproton collisions at 8TeV and recorded by the CMS experiment, are used to search for both narrow resonances and broad deviations from standard model predictions. The data correspond to an integrated luminosity of 20.6 (19.7) fb(-1) for the dimuon (dielectron) channel. No evidence for non-standard-model physics is observed and 95% confidence level limits are set on parameters from a number of new physics models. The narrow resonance analyses exclude a Sequential Standard Model Z(SSM)' resonance lighter than 2.90TeV, a superstring-inspired Z(psi)' lighter than 2.57TeV, and Randall-Sundrum Kaluza-Klein gravitons with masses below 2.73, 2.35, and 1.27TeV for couplings of 0.10, 0.05, and 0.01, respectively. A notable feature is that the limits have been calculated in a model-independent way to enable straightforward reinterpretation in any model predicting a resonance structure. The observed events are also interpreted within the framework of two non-resonant analyses: one based on a large extra dimensions model and one based on a quark and lepton compositeness model with a left-left isoscalar contact interaction. Lower limits are established on M-S, the scale characterizing the onset of quantum gravity, which range from 4.9 to 3.3TeV, where the number of additional spatial dimensions varies from 3 to 7. Similarly, lower limits on Lambda, the energy scale parameter for the contact interaction, are found to be 12.0 (15.2) TeV for destructive (constructive) interference in the dimuon channel and 13.5 (18.3) TeV in the dielectron channel. 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Search for physics beyond the standard model in dilepton mass spectra in proton-proton collisions at root s=8 TeV

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