New measurement of the weak mixing angle

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This project will measure the fundamental physics parameter of the Standard Model ofParticle Physics - the weak mixing angle. This parameter controls the mixing of the weakfields and is related to the masses of the W and Z bosons. The measurement will analysethe Run2 and Run3 data from the ATLAS experiment at CERN's Large Hadron Collider. Themethodology will be to perform a high precision measurement of the Z boson production inthe observable of the leptonic decay angle. This observable can be used to construct aso-called forward-backward asymmetry of the Z boson decays. The measured asymmetry will befitted to extract the weak mixing angle. The fits will also simultaneously constrain theproton's parton density functions which are the largest source of systematic uncertainty.This measurement is anticipated to reach an accuracy that is competitive to earlier leptoncollider results, and will be ground-breaking in achieving this at a hadron collider forthe first time.