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Measurement of the top quark pair production cross section in dilepton final states containing one τ lepton in pp collisions at √s = 13 TeV

  • Author(s): 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
  • et al.
Abstract

© 2020, The Author(s). 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.]

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