Bibcode
Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Flechl, M.; Friedl, M.; Frühwirth, R.; Ghete, V. M.; Grossmann, J.; Hrubec, J.; Jeitler, M.; König, A.; Krammer, N.; Krätschmer, I.; Liko, D.; Madlener, T.; Mikulec, I.; Pree, E.; Rabady, D.; Rad, N.; Rohringer, H.; Schieck, J.; Schöfbeck, R.; Spanring, M.; Spitzbart, D.; Waltenberger, W.; Wittmann, J.; Wulz, C.-E.; Zarucki, M.; Chekhovsky, V.; Mossolov, V.; Gonzalez, J. Suarez; De Wolf, E. A.; Di Croce, D.; Janssen, X.; Lauwers, J.; Van De Klundert, M.; Van Haevermaet, H.; Van Mechelen, P.; Van Remortel, N.; Zeid, S. Abu; Blekman, F.; D'Hondt, J.; De Bruyn, I.; De Clercq, J.; Deroover, K.; Flouris, G.; Lontkovskyi, D.; Lowette, S.; Moortgat, S.; Moreels, L.; Python, Q.; Skovpen, K.; Tavernier, S.; Van Doninck, W.; Van Mulders, P.; Van Parijs, I.; Brun, H.; Clerbaux, B.; De Lentdecker, G.; Delannoy, H.; Fasanella, G.; Favart, L.; Goldouzian, R.; Grebenyuk, A.; Karapostoli, G.; Lenzi, T.; Luetic, J.; Maerschalk, T.; Marinov, A.; Randle-conde, A.; Seva, T.; Velde, C. Vander; Vanlaer, P.; Vannerom, D.; Yonamine, R.; Zenoni, F.; Zhang, F.; Cimmino, A.; Cornelis, T.; Dobur, D.; Fagot, A.; Gul, M.; Khvastunov, I.; Poyraz, D.; Roskas, C.; Salva, S.; Tytgat, M.; Verbeke, W.; Zaganidis, N.; Bakhshiansohi, H.; Bondu, O.; Brochet, S.; Bruno, G. et al.
Bibliographical reference
The European Physical Journal C, Volume 78, Issue 2, article id.165, 29 pp.
Advertised on:
2
2018
Citations
75
Refereed citations
43
Description
Four-lepton production in proton-proton collisions, p p→ (Z/
γ ^*)(Z/γ ^*) → 4ℓ , where 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 35.9
{fb}^{-1}. The ZZ production cross section, σ (p p→ 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) = 4.8 ± 0.2
{(stat)} ± 0.2 {(syst)} ± 0.1 {(theo)} ± 0.1
{(lumi)} × 10^{-6} for events with a four-lepton invariant mass in
the range 80< m_{4ℓ } < 100 {GeV} and a dilepton mass m_{ℓ
ℓ } > 4 {GeV} 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 ZZγ couplings at 95% confidence level:
-0.0012