https://doi.org/10.1140/epjc/s10052-015-3843-5
Regular Article - Theoretical Physics
Charm and beauty quark masses in the MMHT2014 global PDF analysis
1
Department of Physics and Astronomy, University College London, London, WC1E 6BT, UK
2
Institute for Particle Physics Phenomenology, Durham University, Durham, DH1 3LE, UK
* e-mail: thorne@hep.ucl.ac.uk
Received:
13
October
2015
Accepted:
11
December
2015
Published online:
6
January
2016
We investigate the variation in the MMHT2014 PDFs when we allow the heavy-quark masses 
and 
to vary away from their default values. We make PDF sets available in steps of 
and 
, and present the variation in the PDFs and in the predictions. We examine the comparison to the HERA data on charm and beauty structure functions and note that in each case the heavy-quark data, and the inclusive data, have a slight preference for lower masses than our default values. We provide PDF sets with three and four active quark flavours, as well as the standard value of five flavours. We use the pole mass definition of the quark masses, as in the default MMHT2014 analysis, but briefly comment on the 
definition.
© The Author(s), 2016
