Srážky vektorových bosonů v ZZ produkci na detektoru ATLAS

Abstract

Tato práce je zaměřena na hledání elektroslabé produkce dvou Z bosonů do-

The work is focused on the search of electro-weak production of two Z bosons accompanied by a pair of jets in proton-proton collisions exploiting 139 inverse fb of data,acquired at 13 TeV center-of-mass energy during the Run 2 period of LHC.The background-only hypothesis is excluded with statistical significance of 5.8 standard deviations,and the fiducial ZZjj EW production cross-section is measured to be 0.36 +-0.09 (stat.) +-0.05 (syst.) fb,with no significant deviation from the standard model prediction.This makes the measurement, together with simultaneous independent results from the ATLAS and CMS experiments [Aad:2020zbq,Sirunyan:2020alo],the first observation of electro-weak production of two Z bosons in four-lepton channel.