Measurements of the pp $\to$ W$^\pm\gamma\gamma$ and pp $\to$ Z$\gamma\gamma$ cross sections at $\sqrt{s} =$ 13 TeV and limits on anomalous quartic gauge couplings

2021 
The cross section for W or Z boson production in association with two photons is measured in proton-proton collisions at a centre-of-mass energy of 13 TeV. The data set corresponds to an integrated luminosity of 137 fb$^{-1}$ collected by the CMS experiment at the LHC. The W$\to\ell\nu$ and Z$\to\ell\ell$ decay modes (where $\ell=$ e,$\mu$) are used to extract the W$\gamma\gamma$ and Z$\gamma\gamma$ cross sections in a phase space defined by electron (muon) with transverse momentum larger than 35 (30) GeV and photon transverse momentum larger than 20 GeV. The measured cross sections in this phase space are $\sigma$(W$\gamma\gamma$)=13.6$^{+1.9}_{-1.9}$ (stat) ${}^{+4.0}_{-4.0}$ (syst) $\pm$ 0.08 (PDF+scale) fb and $\sigma$(Z$\gamma\gamma$)=5.41$^{+0.58}_{-0.55}$ (stat) ${}^{+0.64}_{-0.70}$ (syst) $\pm$ 0.06 (PDF+scale) fb. Limits on anomalous quartic gauge couplings are set in the framework of an effective field theory with dimension-8 operators.
    • Correction
    • Source
    • Cite
    • Save
    • Machine Reading By IdeaReader
    40
    References
    0
    Citations
    NaN
    KQI
    []