CERN Accelerating science

Article
Report number arXiv:1206.1849 ; CMS-EXO-11-019 ; CERN-PH-EP-2012-157 ; CMS-EXO-11-019 ; CERN-PH-EP-2012-157
Title Search for narrow resonances in dilepton mass spectra in pp collisions at s = 7 TeV
Author(s) CMS Collaboration  Vis alle 2215 forfattere
Publication 2013-07-16
Imprint 09 Jun 2012
Number of pages 22
Note Submitted to Physics Letters B
In: Phys. Lett. B 714 (2012) 158-179
DOI 10.1016/j.physletb.2012.06.051
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; CMS
Free keywords exotics
Abstract A search for narrow, high-mass resonances decaying to electron or muon pairs has been performed using pp collision data collected at 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'ψ 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/ˉMPl of 0.10 (0.05). These limits are the most stringent to date.
Copyright/License publication: © 2012-2025 CERN (License: CC-BY-3.0)
preprint: © 2012-2025 CERN (License: Open Access)



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Email contact: cms-publication-committee-chair@cern.ch


 Element opprettet 2012-06-09, sist endret 2024-08-24


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