Measurement of the W-boson helicity in top-quark decays from tt̄ production in lepton+jets events in pp collisions at√s = 7 TeV Th

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/105393

Title:	Measurement of the W-boson helicity in top-quark decays from tt̄ production in lepton+jets events in pp collisions at√s = 7 TeV Th
Authors:	余欣珊;Chatrchyan, S.;Waltenberger, W.;De Wolf, E. A.;Roland, B.;Vander Velde, C.;Pagano, D.;Martins, T.;Souza, M. H. G.;Da Costa, E. M.;Pavlov, B.;Luetic, J.;Assran, Y.;Voutilainen, M.;Karimäki, V.;Kinnunen, R.;Beaudette, F.;Fontaine, J.-C.;Brochet, S.;Cherepanov, V.;Hauk, J.;Schmidt, A.;Nürnberg, A.;Ott, J.;Ulrich, R.;Markou, A.;Gupta, R.;Singh, A. P.;Maity, M.;Fiore, L.;Iaselli, G.;Singh, G.;Fabbri, F.;Giacomelli, P.;Buontempo, S.;Merola, M.;Torassa, E.;Zotto, P.;Ciocci, M. A.;Vernieri, C.;Migliore, E.;Choi, M.;Casimiro Linares, E.;Krofcheck, D.;Reucroft, S.;Skatchkov, N.;Bitioukov, S.;De La Cruz, B.;Merino, G.;Marco, J.;Camporesi, T.;Colafranceschi, S.;Giffels, M.;Orsini, L.;König, S.;Grab, C.;Mangano, B.;Rossini, M.;Stieger, B.;Gurpinar, E.;Flacher, H.;Dittmann, J.;Sperka, D.;Demiragli, Z.;Narain, M.;Chertok, M.;Conway, J.;Sudano, E.;Incandela, J.;Kcira, D.;Cumalat, J. P.;Smith, J. G.;Marraffino, J. M.;Cheng, T.;Remington, R.;Hofman, D. J.;Akgun, U.;Bilki, B.;Murray, M.;Sanders, S.;Saini, L. K.;Klapoetke, K.;Eads, M.;Iashvili, I.;Wan, Z.;Haley, J.;Morse, D. M.;Hughes, R.;Saka, H.;Bortoletto, D.;Hu, Z.;Maroussov, V.;Padley, B. P.;Contreras-Campana, C.;Lath, A.;Goodell, J.;Hirosky, R.;Neu, C.;Ojalvo, I.;Pierro, G. A.;Smith, W. H.
Contributors:	理學院物理學系
Date:	2013-10-01
Issue Date:	2026-04-23 12:22:13 (UTC+8)
Abstract:	摘要： The W-boson helicity fractions in top-quark decays are measured with$ \mathrm{t}\overline{\mathrm{t}} $events in the lepton+jets final state, using proton-proton collisions at a centre-of-mass energy of 7 TeV, collected in 2011 with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 5.0 fb −1 . The measured fractions of longitudinal, left-, and right-handed helicity are F 0 = 0 . 682 ± 0 . 030 (stat.) ± 0 . 033 (syst.), F L = 0 . 310 ± 0 . 022 (stat.) ± 0 . 022 (syst.), and F R = 0 . 008 ± 0 . 012 (stat.) ± 0 . 014 (syst.), consistent with the standard model predictions. The measured fractions are used to probe the existence of anomalous Wtb couplings. Exclusion limits on the real components of the anomalous couplings g L , g R are also derived. 出版日期： 2013-10 出處： The journal of high energy physics, 2013-10, Vol.2013 (10), Article 167 資源來源： ProQuest Open Access Content Collection 識別號： ISSN: 1029-8479 識別號： ISSN: 1126-6708 識別號： ISSN: 1127-2236 識別號： EISSN: 1029-8479 識別號： DOI: 10.1007/JHEP10(2013)167
Appears in Collections:	[Department of Physics] journal & Dissertation

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