Measurement of the ZZ production cross section and Z to l+l-l'+l'- branching fraction in pp collisions at sqrt(s) = 13 TeV

Abstract : Four-lepton production in proton-proton collisions, pp to (Z/gamma*)(Z/gamma*) to l+l-l'+l'-, where \$l, l' = e or mu, is studied at a center-of-mass energy of 13 TeV with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 2.6 inverse femtobarns. The ZZ production cross section, sigma(pp to ZZ) = 14.6 +1.9/-1.8 (stat) +0.5/-0.3 (syst) +/- 0.2 (theo) +/- 0.4 (lumi) pb, is measured for events with two opposite-sign, same-flavor lepton pairs produced in the mass region 60 < m[l+l-], m[l'+l'-] < 120 GeV. The Z boson branching fraction to four leptons is measured to be B(Z to l+l-l'+l'-) = 4.9 +0.8/-0.7 (stat) +0.3/-0.2}(syst) +0.2/-0.1 (theo) +/- 0.1 (lumi)E-6 for the four-lepton invariant mass in the range 80 < m[l+l-l'+l'-] < 100 GeV and dilepton mass m[l+l'-] > 4 GeV for all opposite-sign lepton pairs. The results are in agreement with standard model predictions.
Type de document :
Article dans une revue
Physics Letters B, Elsevier, 2016, 763, pp.280-303. 〈10.1016/j.physletb.2016.10.054〉

http://hal.in2p3.fr/in2p3-01350639
Contributeur : Dominique Girod <>
Soumis le : lundi 1 août 2016 - 09:45:34
Dernière modification le : jeudi 10 mai 2018 - 02:00:20

Citation

V. Khachatryan, M. Besancon, F. Couderc, M. Dejardin, D. Denegri, et al.. Measurement of the ZZ production cross section and Z to l+l-l'+l'- branching fraction in pp collisions at sqrt(s) = 13 TeV. Physics Letters B, Elsevier, 2016, 763, pp.280-303. 〈10.1016/j.physletb.2016.10.054〉. 〈in2p3-01350639〉

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