The CMS Collaboration2021-02-242021-02-242021The CMS Collaboration. "Measurements of production cross sections of polarized same-sign W boson pairs in association with two jets in proton-proton collisions at s=13 TeV." <i>Physics Letters B,</i> 812, (2021) Elsevier: https://doi.org/10.1016/j.physletb.2020.136018.https://hdl.handle.net/1911/110075The 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.engThis is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).Journal article1-s20-S0370269320308212-mainhttps://doi.org/10.1016/j.physletb.2020.136018