Measurements of the pp -˃ ZZ production cross section and the Z -˃ 4l branching fraction, and constraints on anomalous triple gauge couplings at root s=13TeV
- Title
- Measurements of the pp -˃ ZZ production cross section and the Z -˃ 4l branching fraction, and constraints on anomalous triple gauge couplings at root s=13TeV
- Author
- 김태정
- Keywords
- FINAL-STATES; COLLISIONS
- Issue Date
- 2018-02
- Publisher
- SPRINGER
- Citation
- EUROPEAN PHYSICAL JOURNAL C, v. 78, no. 2, Article no. 165
- Abstract
- Four-lepton production in proton-proton collisions, pp -> (Z/gamma*)(Z/gamma*) -> 4l, where 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 35.9 fb(-1). The ZZ production cross section, sigma(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 < m(l+l-) < 120 GeV, 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 -> 4l) = 4.83(-0.22)(+0.23) (stat)(-0.29)(+0.32) (syst) +/- 0.08 (theo) +/- 0.12(lumi) x 10(-6) for events with a four-lepton invariant mass in the range 80 < m(4l) < 100 GeV and a dilepton mass m(ll) > 4GeV 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 ZZ. couplings at 95% confidence level: -0.0012 < f(4)(Z) < 0.0010, -0.0010 < f(5)(Z) < 0.0013, -0.0012 < f(4)(gamma) < 0.0013, -0.0012 < f(5)(gamma) < 0.0013.
- URI
- https://link.springer.com/article/10.1140%2Fepjc%2Fs10052-018-5567-9https://repository.hanyang.ac.kr/handle/20.500.11754/117425
- ISSN
- 1434-6044; 1434-6052
- DOI
- 10.1140/epjc/s10052-018-5567-9
- Appears in Collections:
- COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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