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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

AuthorsKhachatryan, V.; Brochero Cifuentes, J. A. ; Cabrillo, I. J. ; Calderon, Alicia ; Duarte Campderros, J. ; Fernández, M. ; Gómez, G. ; Graziano, A. ; López Virto, A. ; Marco, Jesús ; Marco, Rafael ; Martínez-Rivero, Celso ; Matorras, Francisco ; Muñoz Sánchez, F. J. ; Piedra, Jonatan ; Rodrigo, Teresa ; Rodríguez Marrero, Ana Y. ; Ruiz Jimeno, Alberto ; Scodellaro, Luca ; Vila, Iván ; Vilar, Rocío ; CMS Collaboration
Issue Date2015
PublisherAmerican Physical Society
CitationPhysical Review D 91(5): 052012 (2015)
AbstractA 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.
Descriptionet al.
Publisher version (URL)https://doi.org/10.1103/PhysRevD.91.052012
URIhttp://hdl.handle.net/10261/140167
DOI10.1103/PhysRevD.91.052012
Identifiersdoi: 10.1103/PhysRevD.91.052012
e-issn: 1550-2368
issn: 1550-7998
Appears in Collections:(IFCA) Artículos
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