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Manuscript Title: Numerical solution of evolution equations for fragmentation functionsQ^{2} | ||

Authors: M. Hirai, S. Kumano | ||

Program title: ffevol1.0 | ||

Catalogue identifier: AELJ_v1_0Distribution format: tar.gz | ||

Journal reference: Comput. Phys. Commun. 183(2012)1002 | ||

Programming language: Fortran77. | ||

Computer: Tested on an HP DL360G5-DC-X5160. | ||

Operating system: Linux 2.6.9-42.ELsmp. | ||

RAM: 130 M bytes | ||

Keywords: Fragmentation function, evolution, Quark, Gluon, QCD.Q^{2} | ||

PACS: 13.87.Fh, 12.38.Bx. | ||

Classification: 11.5. | ||

Nature of problem:This program solves timelike DGLAP Q evolution equations with or without next-to-leading-order α^{2}_{s} effects for fragmentation functions. The evolved functions can be calculated for D, ^{h}_{g}D, ^{h}_{u}D, ^{h}_{ubar}D, ^{h}_{d}D, ^{h}_{dbar}D, ^{h}_{s}D, ^{h}_{sbar}D, ^{h}_{c}D, ^{h}_{cbar}D and ^{h}_{b}D of a random hedron ^{h}_{bbar}h. | ||

Solution method:The DGLAP integrodifferential equations are solved by the Euler's method for the differentiation of ln Q and the Gauss-Legendre method for the ^{2}x integral as explained in section 4 of the manuscript. | ||

Restrictions:This program is used for calculating Q evolution of fragmentation functions in the leading order or in the next-to-leading order of α^{2}. _{s}Q evolution equations are the timelike DGLAP equations. The double precision arithmetic is used. The renormalization scheme is the modified minimal subtraction scheme (^{2}MSbar ). A user provides initial fragmentation functions as the subroutines
FF_INI and HQFF in the end of the distributed code FF_DGLAP.f. In FF_DGLAP.f, the subroutines are given by taking the HKNS07 (2) functions as an example of the initial functions. Then, the user inputs kinematical parameters in the file setup.ini as explained in section 5.2 of the manuscript. | ||

Running time:A few seconds on HP DL360G5-DC-X5160. |

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