Programs in Physics & Physical Chemistry
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|Manuscript Title: A Higher Order Perturbative Parton Evolution Toolkit (HOPPET)|
|Authors: G.P. Salam, J. Rojo|
|Program title: HOPPET|
|Catalogue identifier: AECA_v1_0|
Distribution format: tar.gz
|Journal reference: Comput. Phys. Commun. 180(2009)120|
|Programming language: Fortran 95.|
|Operating system: All.|
|RAM: ~< 10MB|
|Keywords: unpolarised and longitudinally polarised parton space-like distribution functions (PDFs), DGLAP evolution equations, x-space solutions.|
|PACS: 12.38.Bx, 12.38.-t.|
Nature of problem:
Solution of the DGLAP evolution equations up to NNLO (NLO) for unpolarised (longitudinally polarised) PDFs, and provision of tools to facilitate manipulation (convolutions, etc.) of PDFs with user-defined coefficient and splitting functions.
Representation of PDFs on a grid in x, adaptive integration of splitting functions to reduce them to a discretised form, obtaining fast convolutions that are equivalent to integration with an interpolated form of the PDFs; Runge Kutta solution of the Q evolution, and its caching so as to speed up repeated evolution with different initial conditions.
PDFs should be smooth on the scale of the discretisation in x.
a few seconds for initialisation, then ~ 10 ms for creating a tabulation with a relative accuracy of 10-4 from a new initial condition (on a 3.4 GHz Pentium IV processor). Further details in section 9.2.
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