Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-07-07
Phys.Lett. B411 (1997) 211-217
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages LaTex, 4 Postscript figures
Scientific paper
10.1016/S0370-2693(97)01011-3
We examine the charm component F_{2,c}(x,Q^2,m^2) of the proton structure function F_2(x,Q^2) in three different schemes and compare the results with the data in the x and Q^2 region explored by the HERA experiments. Studied are (1) the three flavour number scheme (TFNS) where the production mechanisms are given by the photon-gluon fusion process and the higher order reactions with three light-flavour parton densities as input (2) the four flavour number scheme (FFNS) where F_{2,c} is expressed in four light flavour densities including one for the charm quark and (3) a variable-flavour number scheme (VFNS) which interpolates between the latter two. Both the VFNS and the TFNS give good descriptions of the experimental data. However one cannot use the FFNS for the description of the data at small Q^2.
Buza M.
Matiounine Y.
Smith Jeffrey J.
van Neerven W. L.
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