Preprint

PUBDB-2024-04864

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png NNLO PDFs driven by top-quark data

Alekhin, S.Extern* ; Garzelli, M. V. (Corresponding author)Extern* ; Moch, S.-O.Extern* ; Zenaiev, O.Extern*

2024

This record in other databases:

Please use a persistent id in citations: doi:10.3204/PUBDB-2024-04864

Report No.: DESY-24-092; arXiv:2407.00545

Abstract: 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 $\alpha_s(M_Z)$ 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 $t\bar{t}+X$, the sum of $(t + X)$ and $(\bar{t} + X)$ hadroproduction, and normalized inclusive data double-differential in the invariant mass and rapidity of the $t\bar{t}$ pair at $\sqrt{S}=13$ 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 $\alpha_s^{(n_f=5)}(M_Z)= 0.1150 \pm 0.0009$ and for the top-quark mass in the ${\overline{\mbox{MS}}}$-scheme $m_t(m_t) = 160.6 \pm 0.6$ GeV, corresponding to $m_t^{\rm pole} = 170.2 \pm 0.7$ GeV in the on-shell scheme. The new fit, dubbed ABMPtt, is publicly released in grids in LHAPDF format.

Note: 33 pages, 22 figures, 4 tables

---

Contributing Institute(s):

1. Uni Hamburg / Theorie (UNI/TH)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)
2. DFG project G:(GEPRIS)409651613 - FOR 2926: Next Generation Perturbative QCD for Hadron Structure: Preparing for the Electron-Ion Collider (409651613) (409651613)
3. 05H21GUCCA - Verbundprojekt 05H2021 (ErUM-FSP T03) - Run 3 von CMS am LHC: Präzisionsbestimmung von Partondichtefunktionen und Top-Quark-Masse (BMBF-05H21GUCCA) (BMBF-05H21GUCCA)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2024

---

Database coverage:
; ; Published

---

---

Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Journal Article Alekhin, S. ; Garzelli, M. V. (Corresponding author)Extern* ; Moch, S.-O.Extern* ; Zenaiev, O.Extern*
NNLO PDFs driven by top-quark data
The European physical journal / C 85(2), 162 (2025) [10.1140/epjc/s10052-025-13832-8]2025     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

---