Including heavy flavour production in PDF fits

Abstract

AT HERA heavy quarks may contribute up to 30% of the structure function $F_2$. The introduction of heavy quarks requires an extension of the DGLAP formalism. The effect of using different heavy flavour number schemes, and different approaches to the running of ${\alpha }_s$, are compared using the ZEUS PDF fit formalism. The potential of including charm data in the fit is explored, using $D^{\ast }$ double differential cross-sections rather than the inclusive quantity $F_2^{c\bar{c}}$.

7 pages, 10 figures, contribution to discussion at HERA-LHC workshop 2007