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Search for narrow resonances in dilepton mass spectra in pp collisions at sqrt(s) = 7 TeV

Abstract : A search for narrow, high-mass resonances decaying to electron or muon pairs has been performed using pp collision data collected at sqrt(s)=7 TeV by the CMS experiment in 2011. The data sample corresponds to an integrated luminosity of approximately 5 inverse femtobarns. The event yields observed in the signal regions are consistent with predictions of the standard model backgrounds, and upper limits on the cross section times branching fraction for a resonance decaying to dileptons are extracted from a shape analysis of the dilepton invariant mass distribution. The resulting mass limits at 95% confidence level are 2330 GeV for the Z' in the Sequential Standard Model, 2000 GeV for the superstring-inspired Z'(psi) resonance, 890 (540) GeV for the Stueckelberg extension Z'(St) with the mass parameter epsilon=0.06 (0.04), and 2140 (1810) GeV for Kaluza--Klein gravitons with the coupling parameter k/Mbar(Pl) of 0.10 (0.05). These limits are the most stringent to date.
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http://hal.in2p3.fr/in2p3-00706614
Contributor : Sylvie Flores <>
Submitted on : Monday, June 11, 2012 - 11:00:28 AM
Last modification on : Thursday, June 17, 2021 - 3:18:28 PM

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S. Chatrchyan, M. Besancon, S. Choudhury, M. Dejardin, D. Denegri, et al.. Search for narrow resonances in dilepton mass spectra in pp collisions at sqrt(s) = 7 TeV. Physics Letters B, Elsevier, 2012, 714, pp.158-179. ⟨10.1016/j.physletb.2012.06.051⟩. ⟨in2p3-00706614⟩

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