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.

Autore Pugliese

• Pompili Alexis , Selvaggi Giovanna , Abbrescia Marcello , De Palma Mauro , My Salvatore , Nuzzo Salvatore Vitale

Tutti gli autori

• POMPILI A.;CALABRIA C.;ERRICO F.;MINIELLO G.;SELVAGGI G.;ABBRESCIA M.;DE PALMA M.;RADOGNA R.;VENDITTI R.;MY S.;NUZZO S.V.;LEZKI S.

Titolo volume/Rivista

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Anno di pubblicazione

2018

ISSN

1434-6044

ISBN

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Numero di citazioni Wos

12

Ultimo Aggiornamento Citazioni

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Numero di citazioni Scopus

14

Ultimo Aggiornamento Citazioni

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Settori ERC

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Codici ASJC

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