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

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 fb?1. 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? resonance, 890 (540) GeV for the Stueckelberg extension ZSt with the mass parameter = 0.06 (0.04), and 2140 (1810) GeV for Kaluza?Klein gravitons with the coupling parameter k/MPl of 0.10 (0.05). These limits are the most stringent to date.

Authorship: Chatrchyan S., Khachatryan V., Sirunyan A.M., Tumasyan A., Adam W., Bergauer T., Dragicevic M., Erö J., Fabjan C., Friedl M., Frühwirth R., Ghete V.M., Hammer J., Hörmann N., Hrubec J., Jeitler M., Kiesenhofer W., Knünz V., Krammer M., Liko D., Mikulec I., Pernicka M., Rahbaran B., Rohringer C., Rohringer H., Schöfbeck R., Strauss J., Taurok A., Wagner P., Waltenberger W., Walzel G., Widl E., Wulz C.E., Mossolov V., Shumeiko N.,

Fuente: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2012, 714(2-5), 158-179

Publisher: Elsevier

Publication date: 01/08/2012

No. of pages: 22

Publication type: Article

DOI: 10.1016/j.physletb.2012.06.051

ISSN: 0370-2693,1873-2445

Publication Url: https://doi.org/10.1016/j.physletb.2012.06.051

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