F L structure function and heavy quark contributions

Abstract

In this paper we obtain the heavy-quark contribution to the longitudinal structure functions F L (x, Q 2 ). Since F L structure functions contains rather large heavy flavor contributions in the small x region, we need to use the massive operator matrix elements, which contribute to the heavy flavor Wilson coefficients in unpolarized deeply inelastic scattering in the region Q 2 >> m 2 . The method of QCD analysis, based on the Jacobi polynomials method, is also described. Our results for longitudinal structure function are in good agreement with the available experimental data.

Nonsinglet parton distribution functions from the precise next-to-next-to-next-to leading order QCD fit

“…This method was developed and applied for different QCD analyses [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. The same method has also been applied in the polarized case in Refs.…”

“…In this work this important problem is studied with the help of the method of the structure function reconstruction over their Mellin moments, which is based on the expansion of the structure function in terms of Jacobi polynomials. This method was developed and applied for different QCD analyses [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. The same method has also been applied in the polarized case in Refs.…”

The study of heavy contribution in diffractive parton distribution functions

“…Global fits to determine parton distributions [13,14,15,16,17,18,19,20,21,22,23,5,24,25] use available data and the most up-to-date QCD calculations to best determine the parton distributions. Consequently, we consider all three methods of selecting observables at H1 and ZEUS to achieve the best result.…”