Moments of the heavy-quark parton distribution function from QCD sum rules
Oganesian, A. G.
Original · EN
The moments of the heavy quark-parton distribution functions in a heavy pseudoscalar meson are calculated from QCD sum rules. Expanding these sum rules in the inverse heavy quark mass we obtain the heavy-mass limits of the moments. Comparison with the finite mass results reveals that while the heavy mass expansion works reasonably well for the b quark, one has to take into account terms of higher than (1/mc)² order for the c quark. This result can provide a quantitative assessment of c and b quark fragmentation models based on the heavy-quark mass limit.
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