New radiatively generated LO quark (u, d, s, c, b) and gluon densities in real photon

New, radiatively generated, LO quark (u,d,s,c,b) and gluon densities in real photon are presented. We [1] perform a global fit, based on LO DGLAP evolution equations, to all available data for the structure function F-2(y) (x, Q(2)). We adopt a new theoretical approach called ACOT(X) to deal with heavy quark thresholds (CJKL model). For comparison we perform a standard fit using the Fixed Flavour Number Scheme (FFNScjkl model), updated with respect to previous fits of this type. We show the superiority of the CJKL model over the FFNScjkl one and other LO parton parametrizations for F-2(y)(x, Q(2)). Both our models describe equally well the gluon density extracted from HERA data.