descriptionPublicationkeyboard_double_arrow_right Article , Preprint 01 Jan 2015 English Publisher:Scuola Internazionale Superiore di Studi Avanzati (SISSA)Journal:Journal of High Energy Physics, volume 2,016 (issn: 1029-8479,

Authors: Khachatryan, V; Sirunyan, AM; Tumasyan, A; Adam, W; Asilar, E; Bergauer, T; Brandstetter, J; +193 Authors

Khachatryan, V; Sirunyan, AM; Tumasyan, A; Adam, W; Asilar, E; Bergauer, T; Brandstetter, J; Brondolin, E; Dragicevic, M; Ero, J; Flechl, M; Friedl, M; Fruhwirth, R; Ghete, VM; Hartl, C; Hormann, N; Hrubec, J; Jeitler, M; Knunz, V; Konig, A; Krammer, M; Kratschmer, I; Liko, D; Matsushita, T; Mikulec, I; Rabady, D; Rahbaran, B; Rohringer, H; Schieck, J; Schofbeck, R; Strauss, J; Treberer-Treberspurg, W; Waltenberger, W; Wulz, CE; Mossolov, V; Shumeiko, N; Gonzalez, JS; Alderweireldt, S; Cornelis, T; De Wolf, EA; Janssen, X; Knutsson, A; Lauwers, J; Luyckx, S; Van de Klundert, M; Van Haevermaet, H; Van Mechelen, P; Van Remortel, N; Van Spilbeeck, A; Abu Zeid, S; Blekman, F; D'Hondt, J; Daci, N; De Bruyn, I; Deroover, K; Heracleous, N; Keaveney, J; Lowette, S; Moreels, L; Olbrechts, A; Python, Q; Strom, D; Tavernier, S; Van Doninck, W; Van Mulders, P; Van Onsem, GP; Van Parijs, I; Barria, P; Brun, H; Caillol, C; Clerbaux, B; De Lentdecker, G; Fasanella, G; Favart, L; Grebenyuk, A; Karapostoli, G; Lenzi, T; Leonard, A; Maerschalk, T; Marinov, A; Pernie, L; Randle-Conde, A; Seva, T; Vander Velde, C; Vanlaer, P; Yonamine, R; Zenoni, F; Zhang, F; Beernaert, K; Benucci, L; Cimmino, A; Crucy, S; Dobur, D; Fagot, A; Garcia, G; Gul, M; Mccartin, J; Rios, AAO; Poyraz, D; Ryckbosch, D; Salva, S; Sigamani, M; Tytgat, M; Van Driessche, W; Yazgan, E; Zaganidis, N; Basegmez, S; Beluffi, C; Bondu, O; Brochet, S; Bruno, G; Caudron, A; Ceard, L; Da Silveira, GG; Delaere, C; Favart, D; Forthomme, L; Giammanco, A; Hollar, J; Jafari, A; Jez, P; Komm, M; Lemaitre, V; Mertens, A; Musich, M; Nuttens, C; Perrini, L; Pin, A; Piotrzkowski, K; Popov, A; Quertenmont, L; Selvaggi, M; Marono, MV; Beliy, N; Hammad, GH; Alda, WL; Alves, FL; Alves, GA; Brito, L; Martins, MC; Hamer, M; Hensel, C; Herrera, CM; Moraes, A; Pol, ME; Teles, PR; Das Chagas, EBB; Carvalho, W; Chinellato, J; Custodio, A; Da Costa, EM; Damiao, DD; Martins, CD; De Souza, SF; Guativa, LMH; Malbouisson, H; Figueiredo, DM; Mundim, L; Nogima, H; Da Silva, WLP; Santoro, A; Sznajder, A; Manganote, EJT; Pereira, AV; Ahuja, S; Bernardes, CA; Santos, AD; Dogra, S; Tomei, TRFP; Gregores, EM; Mercadante, PG; Moon, CS; Novaes, SF; Padula, SS; Abad, DR; Vargas, JCR; Aleksandrov, A; Hadjiiska, R; Iaydjiev, P; Rodozov, M; Stoykova, S; Sultanov, G; Vutova, M; Dimitrov, A; Glushkov, I; Litov, L; Pavlov, B; Petkov, P; Ahmad, M; Bian, JG; Chen, GM; Chen, HS; Chen, M; Cheng, T; Du, R; Jiang, CH; Plestina, R; Romeo, F; Shaheen, SM; Spiezia, A;

Measurement of top quark polarisation in t-channel single top quark production

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Abstract

A first measurement of the top quark spin asymmetry, sensitive to the top quark polarisation, in t-channel single top quark production is presented. It is based on a sample of pp collisions at a centre-of-mass energy of 8TeV corresponding to an integrated luminosity of 19.7 fb(-1). A high-purity sample of t-channel single top quark events with an isolated muon is selected. Signal and background components are estimated using a fit to data. A differential cross section measurement, corrected for detector effects, of an angular observable sensitive to the top quark polarisation is performed. The differential distribution is used to extract a top quark spin asymmetry of 0.26 +/- 0.03(stat) +/- 0.10(syst), which is compatible with a p-value of 4.6% with the standard model prediction of 0.44.

Fonds pour la Formation a la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium)

Rachadapisek Sompot Fund for Postdoctoral Fellowship, Chulalongkorn University (Thailand)

Institut National de Physique Nucleaire et de Physique des Particules / CNRS, France

Commissariat a l'Energie Atomique et aux Energies Alternatives / CEA, France

Institute for the Promotion of Teaching Science and Technology of Thailand

Ministry of Education, Science and Technological Development of Serbia

Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium)

Secretaria de Estado de Investigacion, Desarrollo e Innovacion, Spain

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Related Organizations

University of Padua
Italy
BROWN UNIVERSITY
Ghent University
Belgium
University of Belgrade
Serbia
Helmholtz Association of German Research Centres
Germany

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Keywords

COLLISIONS, Nuclear and High Energy Physics, p p: scattering, top: single production, Particles & Fields, final state: ((n)jet lepton), Hadron-Hadron scattering (experiments); Top physics; Nuclear and High Energy Physics, 530, DECAYS, High Energy Physics - Experiment, Physics, Particles & Fields, EVENTS, top: spin, differential cross section: measured, Hadron-Hadron scattering (experiments), Hadron-Hadron scattering (experiments); Top physics; CHARGE ASYMMETRY; LHC; COLLISIONS; EVENTS; DECAYS, Top physic, info:eu-repo/classification/ddc/530, Hadron-Hadron scattering (experiments); Top physics, CHARGE ASYMMETRY, 01 Mathematical Sciences, 8000 GeV-cms, Science & Technology, 02 Physical Sciences, background, CMS, FISICA DELLE PARTICELLE, Hadron-Hadron scattering (experiments); Top physics; Nuclear and High Energy Physics;, Physics, ddc:530, Hadron-Hadron scattering (experiments); Top physics;, 001, Nuclear & Particles Physics, CERN LHC Coll, Physics and Astronomy, Top physics, Physical Sciences, LHC, top: polarization, p p: colliding beams, spin: asymmetry, experimental results

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