TY  - EJOUR
AU  - Alekhin, Sergey
AU  - Garzelli, Maria Vittoria
AU  - Moch, Sven-Olaf
AU  - Zenaiev, Oleksandr
TI  - NNLO PDFs driven by top-quark data
IS  - arXiv:2407.00545
M1  - PUBDB-2024-04864
M1  - arXiv:2407.00545
M1  - DESY-24-092
PY  - 2024
N1  - 33 pages, 22 figures, 4 tables
AB  - We study the impact of state-of-the-art top-quark data collected at the Large Hadron Collider on parton distribution functions (PDFs). Following the ABMP methodology, the fit extracts simultaneously proton PDFs, the strong coupling α<sub>s</sub>(M<sub>Z</sub>) and heavy-quark masses at next-to-next-to-leading order (NNLO) accuracy in QCD. It includes recent high-statistics data on absolute total inclusive cross sections for t―t+X, the sum of (t + X) and (―t + X) hadroproduction, and normalized inclusive data double-differential in the invariant mass and rapidity of the t―t pair at √S=13 TeV. The gluon PDF at large x and the top-quark mass value derived from these data are well compatible with the previous ABMP16 results, but with significantly smaller uncertainties, reduced by up to a factor of two. At NNLO in QCD we obtain for the strong coupling the value α<sub>s</sub><sup>(n<sub>f</sub>=5)</sup>(M<sub>Z</sub>) = 0.1150 ±0.0009 and for the top-quark mass in the ―MS-scheme m<sub>t</sub>(m<sub>t</sub>) = 160.6 ±0.6 GeV, corresponding to m<sub>t</sub><sup>pole</sup> = 170.2 ±0.7 GeV in the on-shell scheme. The new fit, dubbed ABMPtt, is publicly released in grids in LHAPDF format.
LB  - PUB:(DE-HGF)25
DO  - DOI:10.3204/PUBDB-2024-04864
UR  - https://bib-pubdb1.desy.de/record/611212
ER  -