Speaker
Description
Presented by Hyon-San Seo
Recently, the CMS collaboration published measurements of the forward-backward asymmetry (angular coefficient $A_4(M)$)) in Drell–Yan dilepton production in proton-proton collisions at $\sqrt{s}=$ 13 TeV, and $\sin^2 \theta_{eff}$ was extracted from $A_4$ using a several parton distribution functions (PDFs). The PDF errors, as well as the differences between $\sin^2 \theta_{eff}$ values extracted using different PDF sets, are reduced by using PDF profiling which relies on the dilepton mass dependence of $A_4$. None-the-less even after profiling there is still a difference of one standard deviation between the values extracted with the CT18Z, NNPDF4.0 and MSHT20 PDF’s indicating that there is a residual difference in some of the parton distributions after $A_4$ profiling. In this presentation we report on the extraction of the EW mixing angle from the CMS measurement of $A_4$ with XFITTER using a large number of PDF sets , and investigate which PDF distributions are responsible for the residual difference, and if the difference can be reduced by including additional new data in the profiling including W+charm production at 13 TeV (which further constrains the $s-\bar s$ quark distribution) and charged lepton asymmetry in W decays at 13 TeV (which further constrains the $u-\bar u$ and $d-\bar d$ quark distributions).
