Vector boson scattering is a key production process to probe the electroweak symmetry breaking of the standard model, since it involves both self-couplings of vector bosons and coupling with the Higgs boson. If the Higgs mechanism is not the sole source of electroweak symmetry breaking, the scattering amplitude deviates from the standard model prediction at high scattering energy. Moreover, deviations may be detectable even if a new physics scale is higher than the reach of direct searches. Latest measurements of production cross sections of WZ, same-sign WW, and ZZ boson pairs in association with two jets in proton-proton collisions at sqrt(s) = 13 TeV at the LHC are reported using a data set recorded by the CMS detector. Differential fiducial cross sections as functions of several quantities are measured for WW and WZ production. An observation of electroweak production of WZ boson pairs is reported with an observed (expected) significance of 6.8 (5.3) standard deviations. The electroweak production of two jets in association with two Z bosons is measured with an observed (expected) significance of 4.0 (3.5) standard deviations. Furthermore, first measurements of the production cross sections of polarized same-sign WW boson pairs are reported. Constraints are obtained on the structure of quartic vector boson interactions in the framework of effective field theory.
Michelangelo Mangano, Monica Pepe-Altarelli and Pedro Silva