dc.contributor.author Khachatryan, V. dc.contributor.author Sirunyan, A. M. dc.contributor.author Tumasyan, A. dc.contributor.author Adam, W. dc.contributor.author Sanders, Stephen J. dc.date.accessioned 2016-12-15T20:34:56Z dc.date.available 2016-12-15T20:34:56Z dc.date.issued 2015-03-18 dc.identifier.citation Khachatryan, V. "Search for long-lived particles that decay into final states containing two electrons or two muons in proton-proton collisions at s√=8  TeV." (2015): n. pag. en_US dc.identifier.uri http://hdl.handle.net/1808/22239 dc.description.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−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/c2 decays into a pair of long-lived neutral bosons in the mass range 20–350  GeV/c2, 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/c2), the limits are in the range 2–50 fb. These limits are sensitive to Higgs boson branching fractions as low as 10−4. en_US dc.publisher American Physical Society en_US dc.rights This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. en_US dc.rights.uri http://creativecommons.org/licenses/by/3.0/ dc.title Search for long-lived particles that decay into final states containing two electrons or two muons in proton-proton collisions at s√=8  TeV en_US dc.type Article en_US kusw.kuauthor Sanders, Stephen J. kusw.kudepartment Physics and Astronomy en_US dc.identifier.doi 10.1103/PhysRevD.91.052012 en_US kusw.oaversion Scholarly/refereed, publisher version en_US kusw.oapolicy This item meets KU Open Access policy criteria. en_US dc.rights.accessrights openAccess
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