Measurement of the ZZ production cross section and Z → ℓ+′+′− branching fraction in pp collisions at s=13 TeV

V. Khachatryan, A. M. Sirunyan, A. Tumasyan, W. Adam, E. Asilar, T. Bergauer, J. Brandstetter, E. Brondolin, M. Dragicevic, J. Erö, M. Flechl, M. Friedl, R. Frühwirth, V. M. Ghete, C. Hartl, N. Hörmann, J. Hrubec, M. Jeitler, A. König, I. KrätschmerD. Liko, T. Matsushita, I. Mikulec, D. Rabady, N. Rad, B. Rahbaran, H. Rohringer, J. Schieck, J. Strauss, W. Treberer-Treberspurg, W. Waltenberger, C. E. Wulz, V. Mossolov, N. Shumeiko, J. Suarez Gonzalez, S. Alderweireldt, E. A. De Wolf, X. Janssen, J. Lauwers, M. Van De Klundert, H. Van Haevermaet, P. Van Mechelen, N. Van Remortel, A. Van Spilbeeck, S. Abu Zeid, F. Blekman, J. D'Hondt, N. Daci, I. De Bruyn, A. Radi, The CMS Collaboration

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Four-lepton production in proton–proton collisions, pp→(Z/γ)(Z/γ)→ℓ+′+′−, where ℓ,ℓ=e or μ, 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 fb−1. The ZZ production cross section, σ(pp→ZZ)=14.6−1.8 +1.9(stat)−0.3 +0.5(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+ ,m′+′− <120 GeV. The Z boson branching fraction to four leptons is measured to be B(Z→ℓ+′+′−)=4.9−0.7 +0.8 (stat)−0.2 +0.3 (syst)−0.1 +0.2(theo)±0.1(lumi)×10−6 for the four-lepton invariant mass in the range 80<m+′+′− <100 GeV and dilepton mass m+ >4 GeV for all opposite-sign, same-flavor lepton pairs. The results are in agreement with standard model predictions.

Original languageEnglish
Pages (from-to)280-303
Number of pages24
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume763
DOIs
Publication statusPublished - Dec 10 2016

Keywords

  • CMS
  • Electroweak
  • Physics

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Khachatryan, V., Sirunyan, A. M., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., Brandstetter, J., Brondolin, E., Dragicevic, M., Erö, J., Flechl, M., Friedl, M., Frühwirth, R., Ghete, V. M., Hartl, C., Hörmann, N., Hrubec, J., Jeitler, M., König, A., ... The CMS Collaboration (2016). Measurement of the ZZ production cross section and Z → ℓ+′+′− branching fraction in pp collisions at s=13 TeV. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 763, 280-303. https://doi.org/10.1016/j.physletb.2016.10.054