A new modified Altarelli-Parisi evolution equation with parton recombination in proton Original Research Article

The coefficients of the nonlinear terms in a modified Altarelli-Parisi evolution equation with parton recombination are determined in the leading logarithmic (Q2) approximation. The results are valid in the whole x region and contain the translation GG → qq, which is inhibited in the double leading logarithmic approximation. The comparisons of the new evolution equation with the Gribov-Levin-Ryskin equation are presented.