High-precision measurements of the Z-boson transverse momentum and alpha_S with the ATLAS experiment

by Stefano Camarda (CERN)

Tuesday 18 Apr 2023, 11:00 → 12:00 Europe/Zurich

503/1-001 - Council Chamber (CERN)

This seminar presents a precise measurement of the production properties of the Z-boson in the full phase space of the decay leptons, based on 8 TeV pp collision data collected by the ATLAS experiment in 2012. The double-differential cross-section distributions in Z-boson transverse momentum and rapidity are measured in the pole region. In a novel approach, the measured Z transverse momentum is used to determine the strong coupling constant. The analysis uses state-of-the-art predictions at third order accuracy in perturbative QCD, supplemented by resummation of logarithmically-enhanced contributions in the small transverse-momentum region of the lepton pairs. The extracted alphaS(mZ) result is the most precise single measurement to date.

Refreshments will be served at 10:30

Recording

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zptalphas.pdf