Search for decays of stopped long-lived particles produced in proton–proton collisions at √s= 8, TeV

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/106015

Title:	Search for decays of stopped long-lived particles produced in proton–proton collisions at √s= 8, TeV
Authors:	余欣珊;Ghete, V. M.;Van Haevermaet, H.;Seva, T.;Wang, J.;Strobbe, N.;Pin, A.;Fonseca De Souza, S.;Mao, Y.;Finger, M.;Elgammal, S.;Chasserat, J.;Sammet, J.;Ata, M.;Klingebiel, D.;Knutzen, S.;Sonnenschein, L.;Hoehle, F.;Flucke, G.;Lipka, K.;Nayak, A.;Görner, M.;Kogler, R.;Steinbrück, G.;Frensch, F.;Kuznetsova, E.;Geralis, T.;Stiliaris, E.;Beni, N.;Choudhary, B. C.;Mukherjee, S.;Ganguly, S.;Brigliadori, L.;Cappello, G.;Malvezzi, S.;Martelli, A.;Paganoni, M.;Pedrini, D.;Passaseo, M.;Pazzini, J.;Fedi, G.;Argiro, S.;Song, S.;Olszewski, M.;Varela, J.;Afanasiev, S.;Murzin, V.;Krasnikov, N.;Epshteyn, V.;Kirakosyan, M.;Dudko, L.;Kalinin, A.;Flix, J.;Missiroli, M.;Cabrillo, I. J.;Ruiz-Jimeno, A.;Vila, I.;Benhabib, L.;Bondu, O.;Cerminara, G.;Elliott-Peisert, A.;Glege, F.;Guthoff, M.;Hammer, J.;Innocente, V.;Lourenço, C.;Donegà, M.;Nessi-Tedaldi, F.;Cerci, S.;Olaiya, E.;Kenzie, M.;Magnan, A.-M.;Hauser, J.;Valuev, V.;Heilman, J.;Holzner, A.;Yagil, A.;Iiyama, Y.;Gottschalk, E.;Gray, L.;Merkel, P.;Vidal, R.;Avery, P.;Baarmand, M. M.;Maravin, Y.;Rusack, R.;Bose, S.;Mucia, N.;Pearson, T.;Ramirez Vargas, J. E.;Wang, F.;Geurts, F. J. M.;de Barbaro, P.;Eshaq, Y.;Contreras-Campana, E.;Lath, A.;Eusebi, R.;Cox, B.;Cepeda, M.;Perry, T.
Contributors:	理學院物理學系
Keywords:	Astronomy;Astrophysics and Cosmology;Elementary Particles;Hadrons;Heavy Ions;Measurement Science and Instrumentation;Nuclear Energy;Nuclear Physics;Physics;Physics and Astronomy;Quantum Field Theories;Quantum Field Theory;Regular Article - Experimental Physics;String Theory
Date:	2015-04-01
Issue Date:	2026-04-23 13:04:09 (UTC+8)
Publisher:	Springer New York;Berlin/Heidelberg: Springer Berlin Heidelberg
Abstract:	摘要： A search has been performed for long-lived particles that could have come to rest within the CMS detector, using the time intervals between LHC beam crossings. The existence of such particles could be deduced from observation of their decays via energy deposits in the CMS calorimeter appearing at times that are well separated from any proton–proton collisions. Using a data set corresponding to an integrated luminosity of 18.6 fb -1 of 8 TeV proton–proton collisions, and a search interval corresponding to 281 h of trigger livetime, 10 events are observed, with a background prediction of 13 . 2 - 2.5 + 3.6 events. Limits are presented at 95 % confidence level on gluino and top squark production, for over 13 orders of magnitude in the mean proper lifetime of the stopped particle. Assuming a cloud model of R-hadron interactions, a gluino with mass ≲ 1000 GeV and a top squark with mass ≲ 525 GeV are excluded, for lifetimes between 1 μ s and 1000 s . These results are the most stringent constraints on stopped particles to date. 其他題名： Eur. Phys. J. C 出版者： Berlin/Heidelberg: Springer Berlin Heidelberg 出版日期： 2015-04-11 出處： The European physical journal. C, Particles and fields, 2015-04, Vol.75 (4) 資源來源： Publicly Available Content Database 版權： CERN for the benefit of the CMS collaboration 2015 識別號： ISSN: 1434-6044 識別號： EISSN: 1434-6052 識別號： DOI: 10.1140/epjc/s10052-015-3367-z
Appears in Collections:	[Department of Physics] journal & Dissertation

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