학술논문
Measurement of the top quark pair production cross section in dilepton final states containing one τ lepton in pp collisions at √s = 13 TeV
Document Type
article
Author
Sirunyan, AM; Tumasyan, A; Adam, W; Ambrogi, F; Bergauer, T; Brandstetter, J; Dragicevic, M; Erö, J; Escalante Del Valle, A; Flechl, M; Frühwirth, R; Jeitler, M; Krammer, N; Krätschmer, I; Liko, D; Madlener, T; Mikulec, I; Rad, N; Schieck, J; Schöfbeck, R; Spanring, M; Spitzbart, D; Waltenberger, W; Wulz, CE; Zarucki, M; Drugakov, V; Mossolov, V; Suarez Gonzalez, J; Darwish, MR; De Wolf, EA; Di Croce, D; Janssen, X; Lelek, A; Pieters, M; Rejeb Sfar, H; Van Haevermaet, H; Van Mechelen, P; Van Putte, S; Van Remortel, N; Blekman, F; Bols, ES; Chhibra, SS; D’Hondt, J; De Clercq, J; Lontkovskyi, D; Lowette, S; Marchesini, I; Moortgat, S; Python, Q; Skovpen, K; Tavernier, S; Van Doninck, W; Van Mulders, P; Beghin, D; Bilin, B; Brun, H; Clerbaux, B; De Lentdecker, G; Delannoy, H; Dorney, B; Favart, L; Grebenyuk, A; Kalsi, AK; Popov, A; Postiau, N; Starling, E; Thomas, L; Vander Velde, C; Vanlaer, P; Vannerom, D; Cornelis, T; Dobur, D; Khvastunov, I; Niedziela, M; Roskas, C; Tytgat, M; Verbeke, W; Vermassen, B; Vit, M; Bondu, O; Bruno, G; Caputo, C; David, P; Delaere, C; Delcourt, M; Giammanco, A; Lemaitre, V; Prisciandaro, J; Saggio, A; Vidal Marono, M; Vischia, P; Zobec, J; Alves, FL; Alves, GA; Correia Silva, G; Hensel, C; Moraes, A; Rebello Teles, P; Belchior Batista Das Chagas, E; Carvalho, W
Source
Journal of High Energy Physics. 2020(2)
Subject
Language
Abstract
The cross section of top quark pair production is measured in the tt¯→(ℓνℓ)(τhντ)bb¯ final state, where τh refers to the hadronic decays of the τ lepton, and ℓ is either an electron or a muon. The data sample corresponds to an integrated luminosity of 35.9 fb−1 collected in proton-proton collisions at s = 13 TeV with the CMS detector. The measured cross section is σtt ¯ = 781 ± 7 (stat) ± 62 (syst) ± 20 (lumi) pb, and the ratio of the partial width Γ(t → τντb) to the total decay width of the top quark is measured to be 0.1050 ± 0.0009 (stat) ± 0.0071 (syst). This is the first measurement of the t t ¯ production cross section in proton-proton collisions at s = 13 TeV that explicitly includes τ leptons. The ratio of the cross sections in the ℓτh and ℓℓ final states yields a value Rℓτh/ll = 0.973 ± 0.009 (stat) ± 0.066 (syst), consistent with lepton universality. [Figure not available: see fulltext.]