Grid, Computing & Software

  • The prun wiki for submitting general jobs to the grid

Computing Resources & Tools

My Mac


I was running Mac OS X 10.5.8 previously, and had a proper version of gnu gcc, from the GNU site. Then my disk broke and I had it fixed. Mac OS X 10.6.4 (Snow Leopard) was installed then, but I lost my gcc installation which I hadn't backed up.

So I installed Xcode (see the mac dev center) to have make, g++, and gcc. Hopefully it will also be more resilient against Apple software updates, which used to mess up my system before the upgrade.

Fortran compiler

Also installed GNU Fortran 4.2.3 from a disk image here for Mac OS X 10.4.4 or higher. This came with the following instructions and notes:

  • All files will be installed in /usr/local
  • The compiler collection can be used by adding /usr/local/bin to your PATH, e.g.: export PATH=$PATH:/usr/local/bin
  • To remove this package, run: sudo gfortran-uninstall

NOTE: Programs compiled with this Fortran compiler will dynamically link to libraries in /usr/local/lib to prevent incompatibilities with other installed compilers such as Xcode. Use static libraries or supply the libraries with your application if you want such binaries to run anywhere.

The preflight script of this package will fix /usr/loca/lib that was broken by Xcode installation (which creates an infinite symlink) if the problem is detected.


I installed ROOT v5.30.00 + patches following this recipe:

cd /usr/local/ROOT/
sudo svn co root-53001
cd root-53001
sudo ./configure macosx --prefix=/usr/ --enable-tmva --enable-roofit --enable-genvector --enable-minuit2 --enable-soversion
sudo make
sudo make install


I got a disk image file of OpenAFS version 1.6.0pre7 from the AFS site. Only needed to click to download, click (on the icon called "!OpenAFS.pkg", but found this after clicking the worn one) to install, and that's it. Here's more info:

OpenAFS 1.6.0pre7 for MacOS 10.6 (Snowleopard) Prerelease (released 18 Jul 2011)

Known Issues:

  • AFS icon does not appear on user desktop. (Bug 75382)
  • Finder cannot move items by dragging across AFS volumes. (Bug 34255)


Statistics Recipes


Data Samples

  • MC10a - Monte Carlo samples produced with a distribution of number of pileup events (mu)

Pileup Correction:


  • LHAPDF: the Les Houches Accord PDF Interface. The Les Houches Accord PDF (LHAPDF) interface package is designed to work with PDF sets. A PDF set can consist of many individual member PDFs. While the interpretation of the member PDFs depends on the particular set, the LHAPDF interface is specifically designed to accommodate PDFs with uncertainties. For PDFs with uncertainties the PDF set represents one ``fit'' to the data. The individual member of a PDF set are needed to calculate the PDF uncertainty of the observable.

E.g. to be able to use MSTW PDFs with pythia:

"pypars mstp 53 21000",
"pypars mstp 51 21000",
"pypars mstp 55 21000",

Setting mstp 51,53,55 to 21000 you pick the central PDF set; when setting these to values from 21041 to 21080 you pick the individual members of the 40 eigenvectors set correspondingly (90% CL, 68% CL ones are 21001-21040, cf. LHAPDF manual).

Jet Recipes

  • Jet Recipes (pdf file in svn at: atlasgrp: /CombPerf/JetETMiss/JetUserGuide)



B-tagging for early data, including new benchmark efficiencies/purities for release 16 from December 2010.

Top Physics

Soft-Muon Tagging for Top Cross Section Measurement

Top event challenge:

Analysis data format for top SLT studies:


PP.Public.ATLAS Papers & Notes

Higgs Physics

  • LHC Higgs Cross Section Working Group meetings

-- RicardoGoncalo - 05 Dec 2013

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Topic revision: r1 - 2013-12-05 - RicardoGoncalo
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