Abstract
We discuss the causes which can limit the accuracy of the predictions based on the conventional PDFs when including in global parton analyses the data at moderate scales $\mu$. The first is the existence of power corrections ${\cal O} (Q_0^2/\mu^2)$ due to the double counting of contributions arising from the region below the input scale $Q_0$. The second concerns the possible inclusion of the BFKL re-summation of the $(\alpha_s\ln (1/x))^n$ terms. The third is the treatment of the heavy-quark thresholds. We show how to include the heavy-quark masses ($m_h$ with $h=c,b,t$) in DGLAP evolution which provides the correct {\it smooth} behaviour through the threshold regions and how to subtract the low parton virtuality $|k^2|<Q^2_0$ contributions from the DIS and Drell-Yan NLO coefficient functions in order to avoid the double counting.
Highlights
After the War, the journal was reestablished in Kraków and the first volume was printed in 1947
This special volume of Acta Physica Polonica B has been prepared to celebrate the 100th anniversary of our journal established in 1920 by the Polish Physical Society
In 1970, Acta Physica Polonica was split into two series, A and B, the first one covering as of today, general physics, atomic and molecular physics, condensed matter, optics and quantum optics, quantum information, biophysics and applied physics, and the second one publishing articles in general and mathematical physics, particle physics and field theory, nuclear physics, theory of relativity and astrophysics, and statistical physics
Summary
After the War, the journal was reestablished in Kraków and the first volume was printed in 1947. This special volume of Acta Physica Polonica B has been prepared to celebrate the 100th anniversary of our journal established in 1920 by the Polish Physical Society.
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