English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Four-lepton production in proton-proton collisions, $\mathrm{pp}\to(\mathrm{Z}/ \gamma^*)(\mathrm{Z}/\gamma^*) \to 4\ell$, where $\ell =\mathrm{e}$ or $\mu$, is studied at a center-of-mass energy of 13 TeV with theCMS detector at the LHC. The data sample corresponds to an integratedluminosity of 35.9 fb$^{-1}$. The ZZ production cross section,$\sigma(\mathrm{pp} \to \mathrm{Z}\mathrm{Z}) = 17.2 \pm 0.5\text{ (stat) }\pm0.7\text{ (syst) }\pm 0.4(\mathrm{theo}) \pm 0.4\text{ (lumi)}$ pb, measuredusing events with two opposite-sign, same-flavor lepton pairs produced in themass region $60 < m_{\ell^+\ell^-} < $120 GeV, is consistent with standardmodel predictions. Differential cross sections are measured and are welldescribed by the theoretical predictions. The Z boson branching fraction tofour leptons is measured to be $\mathcal{B}(\mathrm{Z}\to 4\ell) = 4.8 \pm0.2\text{ (stat) }\pm 0.2\text{ (syst) } \pm 0.1\text{ (theo) }\pm 0.1\text{(lumi) }\times 10^{-6}$ for events with a four-lepton invariant mass in therange 80 $ < m_{4\ell} < $ 100 GeV and a dilepton mass $m_{\ell\ell} > $4 GeVfor all opposite-sign, same-flavor lepton pairs. The results agree withstandard model predictions. The invariant mass distribution of the four-leptonsystem is used to set limits on anomalous ZZZ and ZZ$\gamma$ couplings at 95%confidence level: $-0.0012 < f_4^\mathrm{Z} < 0.0010$, $-0.0010 <f_5^\mathrm{Z} < 0.0013$, $-0.0012 < f_4^{\gamma} < 0.0013$, $-0.0012 <f_5^{\gamma} < 0.0013$.

european physical journal. c, particles and fields

Measurements of the pp$\to$ZZ production cross section and the Z$\to  4\ell$ branching fraction, and constraints on anomalous triple gauge  couplings at $\sqrt{s} =$ 13 TeV