Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-07-25
Phys.Rev. D57 (1998) 241-244
Physics
High Energy Physics
High Energy Physics - Phenomenology
6 pages, LaTeX, 4 PostScript figures, uses epsf.sty and aipproc.sty; Contribution to DIS97 Workshop, 14-18 April, Chicago, IL,
Scientific paper
10.1103/PhysRevD.57.241
In a consistently formulated pQCD framework incorporating non-zero mass heavy quark partons, there is still the freedom to define parton distributions obeying either mass-independent or mass-dependent evolution equations, contrary to statements made in a recent paper by MRRS. With properly matched hard cross-sections, different choices merely correspond to different factorization schemes, and they yield the same physical cross-sections. We demonstrate this principle in a concrete order \alpha_s calculation of the DIS charm structure function. We also examine the proper matching between parton definitions and subtractions in the hard cross-section near threshold where the calculation is particularly sensitive to mass effects of the heavy quark. The results obtained from the general-mass formalism are quite stable against different choices of scale and exhibit a smooth transition in the threshold region (using either mass-independent or mass-dependent evolution), in contrast to results of another recently proposed scheme.
Olness Fredrick I.
Scalise Randall J.
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