applgrid – Hepforge

Convolution Code Download

Basic example code here
A standalone convolution utility is here

The hoppet code version 1.2.0 for QCD evolution from Gavin Salam and Juan Rojo.

Calculation Code

MCFM: (use standard mcfm 6.8 code)
mcfm-patch (mcfm applgrid patch 0.0.8)
mcfm-bridge (version 0.0.35 - for mcfm-6.8)
NLOjet++:
nlojet++ 4.0.1 (applgrid version 0.0.2)
nlojet++ lhapdf wrapper 1.0.0 (applgrid version 0.0.2)
nlojet++ user module (applgrid version 0.0.2)

Grid Download

Please note, that grids should now be downloaded using the ploughshare website. from the grid download page

Quick Start Guide

how to run the APPLgrid code

Citation

Please cite APPLgrid as
Eur Phys J C 66 (2010) 503

Welcome

The APPLgrid project provides a fast and flexible way to reproduce the results of full NLO calculations with any input parton distribution set in only a few milliseconds rather than the weeks normally required to gain adequate statistics.

Written in C++ (although a fortran interface is included) it can be used for the calculation of any process where the hard subprocess weights from the convolution with the PDF are available from the calculation.

The user can use existing grids simply to obtain the fast cross sections, as with fastNLO, but the complete project is pubically available should the user wish to generate the grids themselves for new cross sections. In this case, the user interfaces the grid code with NLO calculation, and after running the NLO calculation to achieve the required statistical precision once, the results of the calculation with any different parton distribution set can be calculated, typically in around 1 to 100ms, depending on the size of the grid.

At present, examples exist for MCFM and nlojet++. Since the user code that needs to run to extract the weights and create the grid may require changes to the NLO calculation code or may be dependent on specific versions of the code, the specific versions of both MCFM and nlojet++ are included here

An interface to fastNLO (version 1) grids is included.

The code is under continuous development so please come back soon for more information.

Mark Sutton, Pavel Starovoitov, Tancredi Carli, Claire Gwenlan and Gavin Salam - send mail to the authors: applgrid @ projects.hepforge.org: Last updated Mon 14 Mar 2022 17:15:08 GMT