Evolution program for parton densities with perturbative heavy flavor boundary conditions

Abstract

A new code for the scale evolution of modified-minimal-subtraction-scheme parton densities is described. Through next-to-leading order the program uses exact splitting functions. In next-to-next-to-leading order approximate splitting functions are used. For efficiency the program includes analytical results for the evaluation of the weights required for the integrations over the longitudinal momentum fractions of the partons. It also incorporates the operator matrix elements required for the matching conditions across heavy flavor thresholds in higher order perturbation theory. The more efficient handling of the weights implies that the code is faster than similar evolution codes in all modes of operation. The program is written in the C programming language.

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References in corpus (4)

• NNLO evolution of deep-inelastic structure functions: the singlet case
• Improved Approximations for the Three-Loop Splitting Functions in QCD
• Bottom quark electroproduction in variable flavor number schemes
• Variable flavor number schemes versus fixed order perturbation theory for charm quark electroproduction

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