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

SMEFT analysis of vector boson scattering and diboson data from the LHC Run II

“…Fortunately, VBS also benefits from a characteristic signature that allows for a relatively clean isolation, defined by two energetic jets in the forward region and a large rapidity gap between them that contains reduced hadronic activity. 1 The combination of this characteristic topology together with the improved analysis of the high statistics delivered during Run II of the LHC (L = 140 fb −1 at √ s = 13 TeV) has made possible not only the identification of VBS events with reasonable statistical significance, but also the measurement of the associated unfolded cross-sections and differential distributions in the fiducial region [15][16][17][18][19][20][21][22]. In particular, VBS measurements from ATLAS and CMS based on the full Run II dataset have recently been presented for different final states, from W ± W ± j j and Z W ± j j [15] to Z Z j j [18,19], including one analysis targeting polarized W ± W ± scattering [22].…”

Recent VBS scattering measurements with two vector bosons in the final state

“…The EW production of two W bosons with the same sign charge in association with two jets (W ± W ± jj) is known as "the golden channel" among the VBS processes; indeed, it has the lowest contamination from QCD-induced background. In a recent publication from CMS [1] , the fully leptonic final state is chosen to investigate the polarized cross sections of this process [2].…”

NNLO QCD study of polarised W+W− production at the LHC

“…However there exist other alternatives, e.g. the diboson centreof-mass frame, which was also used in the experimental studies [19]. It has been observed that the frame choices tend to be rather complementary to each other in their discrimination power to isolate polarisations [6].…”

“…The amount of statistics of Run 2 at the LHC has enabled polarised measurement in relatively high cross section processes such as V +jet [10][11][12][13], boson [14,15] and topquark pair production [16,17]. There are good prospects for polarised VBS signals at high-luminosity LHC [18] and there already are some results available [19]. It is impossible to directly select bosons with a specified polarisation, but methods like reweighting procedures [10][11][12]20] and artificial intelligence techniques [21][22][23][24] allow for analysis of polarised signals.…”