Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 74, Issue 7, Pages -Publisher
SPRINGER
DOI: 10.1140/epjc/s10052-014-2958-4
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Funding
- London Centre for Terauniverse Studies (LCTS) - European Research Council [267352]
- Science and Technology Facilities Council (STFC)
- European Research Council (ERC) [267352] Funding Source: European Research Council (ERC)
- STFC [ST/J000515/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/J000515/1] Funding Source: researchfish
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I consider the effect on MSTW partons distribution functions (PDFs) due to changes in the choices of theoretical procedure used in the fit. I first consider using the 3-flavour fixed flavour number scheme instead of the standard general mass variable flavour number scheme used in the MSTW analysis. This results in the light quarks increasing at all relatively small values, the gluon distribution becoming smaller at high values of and larger at small , the preferred value of the coupling constant falling, particularly at NNLO, and the fit quality deteriorates. I also consider lowering the kinematic cut on for DIS data and simultaneously introducing higher twist terms which are fit to data. This results in much smaller effects on both PDFs and than the scheme change, except for quarks at very high . I show that the structure function one obtains from a fixed input set of PDFs using the fixed flavour scheme and variable flavour scheme differ significantly for at high , and that this is due to the fact that in the fixed flavour scheme there is a slow convergence of large logarithmic terms of the form relevant for this regime. I conclude that some of the most significant differences in PDF sets are largely due to the choice of flavour scheme used.
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