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http://bura.brunel.ac.uk/handle/2438/18223
Title: | Measurement of the cross section for top quark pair production in association with a W or Z boson in proton-proton collisions at √s=13 TeV |
Authors: | Sirunyan, AM Tumasyan, A Adam, W Ambrogi, F Asilar, E Bergauer, T Brandstetter, J Brondolin, E Dragicevic, M Erö, J Escalante Del Valle, A Flechl, M Friedl, M Frühwirth, R Ghete, VM Grossmann, J Hrubec, J Jeitler, M König, A Krammer, N Krätschmer, I Liko, D Madlener, T Mikulec, I Pree, E Rad, N Rohringer, H Schieck, J Schöfbeck, R Spanring, M Spitzbart, D Waltenberger, W Wittmann, J Wulz, CE Zarucki, M Chekhovsky, V Mossolov, V Suarez Gonzalez, J De Wolf, EA Di Croce, D Janssen, X Lauwers, J Van De Klundert, M Van Haevermaet, H Van Mechelen, P Van Remortel, N Abu Zeid, S Blekman, F D Hondt, J De Bruyn, I De Clercq, J Deroover, K Flouris, G Lontkovskyi, D Lowette, S Marchesini, I Moortgat, S Moreels, L Python, Q Skovpen, K Tavernier, S Van Doninck, W Van Mulders, P Van Parijs, I Beghin, D Bilin, B Brun, H Clerbaux, B De Lentdecker, G Delannoy, H Dorney, B Fasanella, G Favart, L Goldouzian, R Grebenyuk, A Kalsi, AK Lenzi, T Luetic, J Maerschalk, T Marinov, A Seva, T Starling, E Vander Velde, C Vanlaer, P Vannerom, D Yonamine, R Zenoni, F Cornelis, T Dobur, D Fagot, A Gul, M Khvastunov, I Poyraz, D Roskas, C Salva, S Tytgat, M Verbeke, W Zaganidis, N Bakhshiansohi, H Bondu, O |
Keywords: | Hadron-Hadron scattering (experiments),;Top physics |
Issue Date: | 3-Aug-2018 |
Publisher: | Springer |
Citation: | Journal of High Energy Physics, 2018, 2018 (8) |
Abstract: | A measurement is performed of the cross section of top quark pair production in association with a W or Z boson using proton-proton collisions at a center-of-mass energy of 13 TeV at the LHC. The data sample corresponds to an integrated luminosity of 35.9 fb −1 , collected by the CMS experiment in 2016. The measurement is performed in the same-sign dilepton, three- and four-lepton final states. The production cross sections are measured to be σ(tt¯W)=0.77−0.11+0.12(stat)−0.12+0.13(syst)pb and σ(tt¯Z)=0.99−0.08+0.09(stat)−0.10+0.12(syst)pb. The expected (observed) signal significance for the t t ¯ W production in same-sign dilepton channel is found to be 4.5 (5.3) standard deviations, while for the t t ¯ Z production in three- and four-lepton channels both the expected and the observed significances are found to be in excess of 5 standard deviations. The results are in agreement with the standard model predictions and are used to constrain the Wilson coefficients for eight dimension-six operators describing new interactions that would modify t t ¯ W and t t ¯ Z production.[Figure not available: see fulltext.]. |
URI: | http://bura.brunel.ac.uk/handle/2438/18223 |
DOI: | http://dx.doi.org/10.1007/JHEP08(2018)011 |
ISSN: | 1126-6708 http://dx.doi.org/10.1007/JHEP08(2018)011 1029-8479 |
Appears in Collections: | Dept of Electronic and Electrical Engineering Research Papers |
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FullText.pdf | 1.55 MB | Adobe PDF | View/Open |
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