Search for long-lived particles that decay into final states containing two electrons or two muons in proton-proton collisions at √s = 8 TeV
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PhysRevD.91.052012.pdf
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Author(s)
Khachatryan, V.
Sirunyan, A. M.
Tumasyan, A.
Adam, W.
Bergauer, T.
Dragicevic, M.
Erö, J.
Friedl, M.
Frühwirth, R.
Ghete, V. M.
Date Issued
March 2015
Journal
Physical Review D
Publisher
American Physical Society
Citation
Khachatryan, V., et al. "Search for long-lived particles that decay into final states containing two electrons or two muons in proton-proton collisions at √s = 8 TeV." Phys. Rev. D 91, 052012 (March 2015). © 2015 CERN, for the CMS Collaboration
Version
Final published version
Abstract
A search is performed for long-lived particles that decay into final states that include a pair of electrons or a pair of muons. The experimental signature is a distinctive topology consisting of a pair of charged leptons originating from a displaced secondary vertex. Events corresponding to an integrated luminosity of 19.6 (20.5) fb[superscript -1] in the electron (muon) channel were collected with the CMS detector at the CERN LHC in proton-proton collisions at √s = 8 TeV. No significant excess is observed above standard model expectations. Upper limits on the product of the cross section and branching fraction of such a signal are presented as a function of the long-lived particle’s mean proper decay length. The limits are presented in an approximately model-independent way, allowing them to be applied to a wide class of models yielding the above topology. Over much of the investigated parameter space, the limits obtained are the most stringent to date. In the specific case of a model in which a Higgs boson in the mass range 125–1000 GeV/c[superscript 2] decays into a pair of long-lived neutral bosons in the mass range 20–350 GeV/c[superscript 2], each of which can then decay to dileptons, the upper limits obtained are typically in the range 0.2–10 fb for mean proper decay lengths of the long-lived particles in the range 0.01–100 cm. In the case of the lowest Higgs mass considered (125 GeV/c[superscript 2]), the limits are in the range 2–50 fb. These limits are sensitive to Higgs boson branching fractions as low as 10[superscript -4].
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Massachusetts Institute of Technology. School of Science
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevD.91.052012
