A fit of the b-quark pole and running masses from HERA beauty data is claimed to match the NNLO perturbative QCD relation, but the comparison uses the wrong strong-coupling scale and overstates the agreement.
MRST partons generated in a fixed-flavour scheme
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abstract
We generate fixed three- and four-light-flavour sets of partons using MRST2004 partons as input. We show that it is important to set n_f=3 in the strong coupling, as well as in the splitting and coefficient functions, in order to obtain a consistent set of fixed-flavour partons. We compare the description of data using partons in both variable- and fixed-flavour-number-schemes.
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2019 1verdicts
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NNLO compatibility between pQCD theory and phenomenology in determination of the $b$-quark pole and \MSbar running masses
A fit of the b-quark pole and running masses from HERA beauty data is claimed to match the NNLO perturbative QCD relation, but the comparison uses the wrong strong-coupling scale and overstates the agreement.