Abstract
The first measurements of production cross sections of polarized same-sign W±W± boson pairs in proton-proton collisions are reported. The measurements are based on a data sample collected with the CMS detector at the LHC at a center-of-mass energy of 13TeV, corresponding to an integrated luminosity of 137fb−1. Events are selected by requiring exactly two same-sign leptons, electrons or muons, moderate missing transverse momentum, and two jets with a large rapidity separation and a large dijet mass to enhance the contribution of same-sign W±W± scattering events. An observed (expected) 95% confidence level upper limit of 1.17 (0.88) fbis set on the production cross section for longitudinally polarized same-sign W±W± boson pairs. The electroweak production of same-sign W±W± boson pairs with at least one of the W bosons longitudinally polarized is measured with an observed (expected) significance of 2.3 (3.1) standard deviations.
Highlights
Vector boson scattering (VBS) processes probe the electroweak (EW) symmetry breaking mechanism at high energy scales
The expected yields are shown with their best fit normalizations from tttihhoeenssW.im±XTuhWlet±TaWnye±LioeuWlds±Tfiastasfunomdr tiWnhge±T tWWhe±L±T WSMy±LiepladrnesddaiWcrtei±XooW nbft±Toaricnrteohdsesfrrsaoetmcioof the yields
The measurements are based on a sample of proton-proton collisions at a center-of-mass energy of 13 TeV collected by the CMS detector at the LHC, corresponding to an integrated luminosity of 137 fb−1
Summary
Vector boson scattering (VBS) processes probe the electroweak (EW) symmetry breaking mechanism at high energy scales. The unitarity of the tree-level amplitude of the scattering of longitudinally polarized gauge bosons at high energies is restored in the standard model (SM) by a Higgs boson with a mass lower than about 1 TeV [1,2]. Modifications of the VBS cross section for the longitudinally polarized W and Z bosons are predicted in models of physics beyond the SM through modifications of the Higgs boson couplings to gauge bosons or through the presence of new resonances [6,7]. They are part of a class of processes contributing to the same-sign W±W± production in association with two jets that proceeds via the EW interaction at tree level, O(α4), where α is the EW coupling, referred to as EW W±W± production. Two sets of results are reported with the helicity eigenstates defined either in the WW center-of-mass reference frame or in the initial-state parton-parton one
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