Search for excited leptons 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/987654321/106102

Title:	Search for excited leptons in proton-proton collisions at √s = 8 TeV
Authors:	林宗泰;Tavernier, S.;Brun, H.;Caillol, C.;Clerbaux, B.;Seva, T.;Zenoni, F.;Crucy, S.;Poyraz, D.;Popov, A.;Beliy, N.;Da Costa, E. M.;Mercadante, P. G.;Chen, M.;Attikis, A.;Lampén, T.;Lehti, S.;Tuominen, E.;Strebler, T.;Courbon, B.;Ruiz Alvarez, J. D.;Sgandurra, L.;Klein, K.;Duchardt, D.;Reithler, H.;Pistone, C.;Mankel, R.;Mussgiller, A.;Ntomari, E.;Draeger, A. R.;Erfle, J.;Junkes, A.;Schettler, H.;Vanhoefer, A.;Berger, J.;Kalsi, A. K.;Mittal, M.;Mohanty, A. K.;Behnamian, H.;Fiore, L.;Cavallo, F. R.;Chiorboli, M.;Iorio, A. O. M.;Gonella, F.;Meneguzzo, A. T.;Pazzini, J.;Romero, A.;Candelise, V.;Choi, S.;Yoo, H. D.;Nawrocki, K.;Olszewski, M.;Afanasiev, S.;Golutvin, I.;Smirnov, V.;Mesyats, G.;Boos, E.;Ekmedzic, M.;Daponte, V.;Lucchini, M. T.;Petrucciani, G.;Renker, D.;Ngadiuba, J.;Dietz, C.;Gülmez, E.;Cussans, D.;Worm, S. D.;Baber, M.;Malik, S.;Hatakeyama, K.;Kasmi, A.;Breto, G.;Chauhan, S.;Ko, W.;Kennedy, E.;Bradmiller-Feld, J.;Campagnari, C.;Flowers, K.;Mott, A.;Cumalat, J. P.;Wagner, S. R.;Yang, F.;Zakaria, M.;Moeller, A.;Fehling, D.;Dahmes, B.;Kamalieddin, R.;Kravchenko, I.;Teixeira De Lima, R.;Musienko, Y.;Gutay, L.;Miller, D. H.;Roberts, J.;Contreras-Campana, E.;Thomassen, P.;Li, H.;Harr, R.;Cepeda, M.;Gomber, B.;Hall-Wilton, R.;Klabbers, P.
Contributors:	理學院物理學系
Keywords:	Classical and Quantum Gravitation;Elementary Particles;High energy physics;Physics;Physics and Astronomy;Quantum Field Theories;Quantum Field Theory;Quantum Physics;Regular Article - Experimental Physics;Relativity Theory;String Theory
Date:	2016-03-01
Issue Date:	2026-04-23 13:08:23 (UTC+8)
Publisher:	Berlin/Heidelberg: Springer Berlin Heidelberg
Abstract:	摘要： A bstract A search for compositeness of electrons and muons is presented using a data sample of proton-proton collisions at a center-of-mass energy of s = 8 TeV collected with the CMS detector at the LHC and corresponding to an integrated luminosity of 19.7 fb −1 . Excited leptons ( ℓ * ) produced via contact interactions in conjunction with a standard model lepton are considered, and a search is made for their gauge decay modes. The decays considered are ℓ * → ℓγ and ℓ * → ℓ Z, which give final states of two leptons and a photon or, depending on the Z-boson decay mode, four leptons or two leptons and two jets. The number of events observed in data is consistent with the standard model prediction. Exclusion limits are set on the excited lepton mass, and the compositeness scale Λ. For the case M ℓ * = Λ the existence of excited electrons (muons) is excluded up to masses of 2.45 (2.47) TeV at 95% confidence level. Neutral current decays of excited leptons are considered for the first time, and limits are extended to include the possibility that the weight factors f and f ′, which determine the couplings between standard model leptons and excited leptons via gauge mediated interactions, have opposite sign. 其他題名： J. High Energ. Phys 出版者： Berlin/Heidelberg: Springer Berlin Heidelberg 出版日期： 2016-03-17 出處： The journal of high energy physics, 2016-03, Vol.2016 (3), p.1 資源來源： Publicly available content database 版權： The Author(s) 2016 版權： Journal of High Energy Physics is a copyright of Springer, 2016. 識別號： EISSN: 1029-8479 識別號： DOI: 10.1007/JHEP03(2016)125
Appears in Collections:	[Department of Physics] journal & Dissertation

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