Search for long-lived particles that decay into final states containing two electrons or two muons in proton-proton collisions at s =8TeV

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/106430

Title:	Search for long-lived particles that decay into final states containing two electrons or two muons in proton-proton collisions at s =8TeV
Authors:	林宗泰;Knünz, V.;Krätschmer, I.;Bansal, M.;Van Spilbeeck, A.;Van Mulders, P.;Villella, I.;Perniè, L.;Costantini, S.;Piotrzkowski, K.;Matos Figueiredo, D.;Prado Da Silva, W. L.;Rodozov, M.;Sultanov, G.;Kadastik, M.;Merschmeyer, M.;Cherepanov, V.;Erdogan, Y.;Kalogeropoulos, A.;Katsas, P.;Ott, J.;Sander, C.;Schmidt, A.;Hauth, T.;Katkov, I.;Stober, F. M.;Topsis-Giotis, I.;Mittal, M.;Singh, J. B.;Gomber, B.;Dewanjee, R. K.;Paktinat Mehdiabadi, S.;Creanza, D.;Castro, A.;Fabbri, F.;Giacomelli, P.;Robutti, E.;Buontempo, S.;Gasparini, U.;Ratti, S. P.;Biasini, M.;Azzurri, P.;Broccolo, G.;Fiori, F.;Soffi, L.;Arcidiacono, R.;Oh, Y. D.;Son, D. C.;Bialkowska, H.;Bunkowski, K.;Zhokin, A.;de Trocóniz, J. F.;Munoz Sanchez, F. J.;Rodríguez-Marrero, A. Y.;Colafranceschi, S.;De Guio, F.;Elliott-Peisert, A.;Sakulin, H.;Wollny, H.;Bertl, W.;Ingram, Q.;Kotlinski, D.;Dissertori, G.;Mangano, B.;Pandolfi, F.;Kangal, E. E.;Sekmen, S.;Newbold, D. M.;Davies, G.;Nash, J.;Symonds, P.;Ferapontov, A.;Branson, J. G.;West, C.;Pierini, M.;Azzolini, V.;Calamba, A.;Cumalat, J. P.;Wittich, P.;Abdullin, S.;Elvira, V. D.;Hanlon, J.;Jindariani, S.;Mason, D.;O’Dell, V.;Furic, I. K.;Mei, H.;Sperka, D.;Adams, M. R.;Cavanaugh, R.;Rahmat, R.;Barnett, B. A.;Bose, S.;Wulsin, H. W.;Hardenbrook, J.;Zheng, Y.;Goulianos, K.;Tatarinov, A.;Kunori, S.;Johns, W.;Sarangi, T.
Contributors:	理學院物理學系
Date:	2015-03-18
Issue Date:	2026-04-23 13:22:23 (UTC+8)
Publisher:	United States: American Physical Society
Abstract:	摘要： 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. As a result, these limits are sensitive to Higgs boson branching fractions as low as 10–4. 出版者： United States: American Physical Society 出版日期： 2015-03-18 出處： Physical review. D, Particles, fields, gravitation, and cosmology, 2015-03, Vol.91 (5) 識別號： ISSN: 1550-7998 識別號： EISSN: 1550-2368 識別號： DOI: 10.1103/PhysRevD.91.052012
Appears in Collections:	[Department of Physics] journal & Dissertation

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