Regular Article - Theoretical Physics
Constraining the top-quark mass within the global MSHT PDF fit
Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607, Hamburg, Germany
2 Department of Physics and Astronomy, University of Sussex, Sussex House, BN1 9RH, Brighton, UK
Accepted: 24 August 2023
Published online: 11 September 2023
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 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 and is compatible with the world average pole mass extracted from cross section measurements of 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.
© The Author(s) 2023
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