Determination of the strong-coupling constant from the Z-boson transverse-momentum distribution.

The strong-coupling constant is determined from the low-momentum region of the transverse-momentum distribution of Z bosons produced through the Drell–Yan process, using predictions at third order in perturbative QCD. The analysis employs a measurement performed in proton-antiproton collisions at a centre-of-mass energy of s = 1.96 TeV with the CDF experiment. The determined value of the strong coupling at the reference scale corresponding to the Z-boson mass is α S (m Z) = 0. 1191 - 0.0016 + 0.0013 . [ABSTRACT FROM AUTHOR]