Constraining the top-quark mass within the global MSHT PDF fit

Abstract

We examine the ability of experimental measurements of top-quark pair production to constrain both the top-quark mass and the strong coupling within the global MSHT parton distribution function (PDF) fit. Specifically, we consider ATLAS and CMS measurements of differential distributions taken at a centre-of-mass energy of 8 TeV, as well as $t\bar{t}$ total cross section data taken at a variety of experiments, and compare to theoretical predictions including next-to-next-to-leading order corrections. We find that supplementing the global fit with this additional information results in relatively strong constraints on the top-quark mass, and is also able to bound the strong coupling in a limited fashion. Our final result is $m_t=173.0\pm 0.6\mathrm{GeV}$ and is compatible with the world average pole mass extracted from cross section measurements of $172.5\pm 0.7\mathrm{GeV}$ by the Particle Data Group. We also study the effect of different top-quark masses on the gluon parton distribution function, finding changes at high $x$ which nonetheless lie within the large PDF uncertainties in this region.

35 pages, 13 figures, 3 tables

References in corpus (19)

• Parton distributions for the LHC
• Parton distributions in the LHC era: MMHT 2014 PDFs
• A novel subtraction scheme for double-real radiation at NNLO
• Four-dimensional formulation of the sector-improved residue subtraction scheme
• Top-quark pair hadroproduction at next-to-next-to-leading order in QCD
• Measurement of the t t-bar production cross section in the dilepton channel in pp collisions at sqrt(s) = 7 TeV
• Snowmass 2021 whitepaper: Proton structure at the precision frontier
• Measurement of the t t-bar production cross section in pp collisions at sqrt(s) = 7 TeV with lepton + jets final states
• Measurement of the inclusive jet cross-sections in proton--proton collisions at $\sqrt{s}=$8 TeV with the ATLAS detector
• Top-quark pair production at hadron colliders: differential cross section and phenomenological applications with DiffTop
• Measurement of top quark pair differential cross-sections in the dilepton channel in $pp$ collisions at $\sqrt{s}$ = 7 and 8 TeV with ATLAS
• Measurement of the ttbar production cross section in pp collisions at sqrt(s) = 8 TeV in dilepton final states containing one tau lepton
• Determination of the top-quark mass from hadro-production of single top-quarks
• An investigation of the ${\alpha }_S$ and heavy quark mass dependence in the MSHT20 global PDF analysis
• Zero-jettiness resummation for top-quark pair production at the LHC
• Determination of the strong coupling constant ${\alpha }_s(m_Z)$ from measurements of the total cross section for top-antitop quark production
• Simultaneous CTEQ-TEA extraction of PDFs and SMEFT parameters from jet and $t\bar{t}$ data
• Projected transverse momentum resummation in top-antitop pair production at LHC
• Bump-hunting in LHC ttbar events

Cited by in corpus (5)

• Yadism: Yet Another Deep-Inelastic Scattering Module
• Top-quark pole mass extraction at NNLO accuracy, from total, single- and double-differential cross sections for $t\bar{t}+X$ production at the LHC
• NNLO PDFs driven by top-quark data
• Robust estimates of theoretical uncertainties at fixed-order in perturbation theory
• Precise determination of the top-quark on-shell mass $M_t$ via its scale-invariant perturbative relation to the top-quark $\overline{\mathrm{MS}}$ mass ${\overline{m}}_t({\overline{m}}_t)$