Please use this identifier to cite or link to this item:
http://bura.brunel.ac.uk/handle/2438/16632
Title: | Measurements of the p p → Z Z production cross section and the Z → 4 ℓ branching fraction, and constraints on anomalous triple gauge couplings at √s=13TeV |
Authors: | Sirunyan, AM Tumasyan, A Adam, W Ambrogi, F Asilar, E Bergauer, T Brandstetter, J Brondolin, E Dragicevic, M Erö, J 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 Rabady, D Rad, N Rohringer, H Schieck, J Schöfbeck, R Spanring, M Spitzbart, D Waltenberger, W Wittmann, J Wulz, CE Zarucki, M Chekhovsky, V Mossolov, V Gonzalez, JS De Wolf, EA Di Croce, D Janssen, X Lauwers, J Van De Klundert, M Van Haevermaet, H Van Mechelen, P Van Remortel, N Zeid, SA Blekman, F D Hondt, J De Bruyn, I De Clercq, J Deroover, K Flouris, G Lontkovskyi, D Lowette, S Moortgat, S Moreels, L Python, Q Skovpen, K Tavernier, S Van Doninck, W Van Mulders, P Van Parijs, I Brun, H Clerbaux, B De Lentdecker, G Delannoy, H Fasanella, G Favart, L Goldouzian, R Grebenyuk, A Karapostoli, G Lenzi, T Luetic, J Maerschalk, T Marinov, A Randle-conde, A Seva, T Velde, CV Vanlaer, P Vannerom, D Yonamine, R Zenoni, F Zhang, F Cimmino, A 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 Brochet, S Bruno, G |
Issue Date: | 2018 |
Publisher: | Springer Verlag |
Citation: | European Physical Journal C, 2018, 78 (2) |
Abstract: | Four-lepton production in proton-proton collisions, p p → (Z / γ∗) (Z / γ∗) → 4 ℓ, where ℓ= e or μ, is studied at a center-of-mass energy of 13TeV with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 35.9fb-1. The ZZ production cross section, σ(pp→ZZ)=17.2±0.5(stat)±0.7(syst)±0.4(theo)±0.4(lumi) pb, measured using events with two opposite-sign, same-flavor lepton pairs produced in the mass region 60<mℓ+ℓ-<120GeV, is consistent with standard model predictions. Differential cross sections are measured and are well described by the theoretical predictions. The Z boson branching fraction to four leptons is measured to be B(Z=4.8±0.2(stat)±0.2(syst)±0.1(theo)±0.1(lumi)×10-6 for events with a four-lepton invariant mass in the range 80<m4ℓ<100GeV and a dilepton mass m4GeV for all opposite-sign, same-flavor lepton pairs. The results agree with standard model predictions. The invariant mass distribution of the four-lepton system is used to set limits on anomalous ZZZ and ZZγ couplings at 95% confidence level: -0.0012<f4Z<0.0010, -0.0010<f5Z<0.0013, -0.0012<f4γ<0.0013, -0.0012<f5γ<0.0013. |
URI: | http://bura.brunel.ac.uk/handle/2438/16632 |
DOI: | http://dx.doi.org/10.1140/epjc/s10052-018-5567-9 |
ISSN: | 1434-6044 http://dx.doi.org/10.1140/epjc/s10052-018-5567-9 1434-6052 |
Appears in Collections: | Publications |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Fulltext.pdf | 2.16 MB | Adobe PDF | View/Open |
Items in BURA are protected by copyright, with all rights reserved, unless otherwise indicated.