Four-lepton production in proton–proton collisions, pp→(Z/γ⁎)(Z/γ⁎)→ℓ+ℓ−ℓ′+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<mℓjavax.xml.bind.JAXBElement@7f324cdbℓjavax.xml.bind.JAXBElement@44f8d2ac,mℓjavax.xml.bind.JAXBElement@38edc246ℓjavax.xml.bind.JAXBElement@46a9b113<120 GeV. The Z boson branching fraction to four leptons is measured to be B(Z→ℓ+ℓ−ℓ′+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<mℓjavax.xml.bind.JAXBElement@2b906989ℓjavax.xml.bind.JAXBElement@297fa3e5ℓjavax.xml.bind.JAXBElement@7f56ab7eℓjavax.xml.bind.JAXBElement@74fcbcae<100 GeV and dilepton mass mℓjavax.xml.bind.JAXBElement@5c084f99ℓjavax.xml.bind.JAXBElement@8bcaf76>4 GeV for all opposite-sign, same-flavor lepton pairs. The results are in agreement with standard model predictions.

Khachatryan, V., Sirunyan, A., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., et al. (2016). Measurement of the ZZ production cross section and Z → ℓ+ℓ−ℓ′+ℓ′− branching fraction in pp collisions at s=13 TeV. PHYSICS LETTERS. SECTION B, 763, 280-303 [10.1016/j.physletb.2016.10.054].

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

DINARDO, MAURO EMANUELE;FIORENDI, SARA;GENNAI, STEFANO;GHEZZI, ALESSIO;GOVONI, PIETRO;MANZONI, RICCARDO ANDREA;MARZOCCHI, BADDER;MORONI, LUIGI;PAGANONI, MARCO;RAGAZZI, STEFANO;TABARELLI DE FATIS, TOMMASO;BRIANZA, LUCA;PIGAZZINI, SIMONE;De Guio, F;Lucchini, M;
2016

Abstract

Four-lepton production in proton–proton collisions, pp→(Z/γ⁎)(Z/γ⁎)→ℓ+ℓ−ℓ′+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 604 GeV for all opposite-sign, same-flavor lepton pairs. The results are in agreement with standard model predictions.
Articolo in rivista - Articolo scientifico
CMS; Electroweak; Physics;
CMS; Electroweak; Physics; Nuclear and High Energy Physics
English
280
303
24
Khachatryan, V., Sirunyan, A., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., et al. (2016). Measurement of the ZZ production cross section and Z → ℓ+ℓ−ℓ′+ℓ′− branching fraction in pp collisions at s=13 TeV. PHYSICS LETTERS. SECTION B, 763, 280-303 [10.1016/j.physletb.2016.10.054].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/140759
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