ManeParse: A Mathematica reader for Parton Distribution Functions

D. Clark

doi:10.1016/j.cpc.2017.03.004

2017-07-01

D. Clark

E. Godat *

Fred Olness

DOI：10.1016/j.cpc.2017.03.004

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摘要

En 中文

Parton Distribution Functions (PDFs) are essential non-perturbative inputs for calculation of any observable with hadronic initial states. These PDFs are released by individual groups as discrete grids as a function of the Bjorken-x and energy scale Q. The LHAPDF project maintains a repository of PDFs from various groups in a new standardized LHAPDF6 format, additionally older formats such as the CTEQ PDS grid format are still in use. ManeParse is a package that provides access to PDFs within Mathematica to facilitate calculation and plotting. The program is self-contained so there are no external links to any FORTRAN, C or C++ programs. The package includes the option to use the built-in Mathematica interpolation or a custom cubic Lagrange interpolation routine which allows for flexibility in the extrapolation (particularly at small x-values). ManeParse is fast enough to enable simple calculations (involving even one or two integrations) in the Mathematica framework. Program summary Program Title: ManeParse Program Files doi: http://dx.dotorgi10.17632/knbsccggg4.1 Licensing provisions: MIT Programming language: Mathematica Nature of problem: PDFs are currently read and interpolated via a FORTRAN or C++ interface. No method exist to read the LHAPDF6 or CTEQ PDFs directly in Mathematica. Solution method: A Mathematica package reads in LHAPDF6 and CTEQ PDF files. The PDFs are parsed into a three-dimensional array in Bjorken-x, scattering energy Q, and parton flavor, and are stored in memory. Provided functions give access to the PDF, the PDF uncertainty, the PDF correlations, and the parton-parton Luminosities. The LHAPDF6 info files are converted from YAML format into Mathematica rules. (C) 2017 Elsevier B.V. All rights reserved.

Keyword:

QCD

Mathematica

Parton Distribution Functions

PDF

PDFs

Hadron collider

PDF errors

Hadronic cross section

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Computer Physics Communications

IF:

3.4

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1.2W

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Southern Methodist University

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