Abstract
We present a systematic interpretation of vector boson scattering (VBS) and diboson measurements from the LHC in the framework of the dimension-six standard model effective field theory (SMEFT). We consider all available measurements of VBS fiducial cross-sections and differential distributions from ATLAS and CMS, in most cases based on the full Run II luminosity, and use them to constrain 16 independent directions in the dimension-six EFT parameter space. Compared to the diboson measurements, we find that VBS provides complementary information on several of the operators relevant for the description of the electroweak sector. We also quantify the ultimate EFT reach of VBS measurements via dedicated projections for the high luminosity LHC. Our results motivate the integration of VBS processes in future global SMEFT interpretations of particle physics data.
Highlights
One significant challenge in studying the vector boson scattering (VBS) process at the LHC is the rather small signal-to-noise ratios due to its electroweak nature, with backgrounds being dominated by QCD-induced diboson production
We present the fit results for the baseline dataset, determine the 95% CL intervals for the nop = 16 operators considered, and study the dependence of our results with respect to variations of the input data, in particular with fits based only on VBS measurements
We have presented an exhaustive investigation of effects from dimension-six standard model effective field theory (SMEFT) operators in the theoretical modelling of vector boson scattering processes
Summary
One significant challenge in studying the VBS process at the LHC is the rather small signal-to-noise ratios due to its electroweak nature, with backgrounds being dominated by QCD-induced diboson production. VBS 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.. VBS 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 This approach is only beneficial for bookkeeping purposes since, among other limitations, it violates gauge invariance For this reason, different strategies based on effective field theories have been advocated [30,31,32,33] to interpret multi-boson and VBS measurements. VBS measurements have often been interpreted in the SMEFT framework to identify, parametrise, and correlate possible deviations in the structure of the electroweak gauge couplings compared to the SM predictions
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call