Sherpa Release 1.0.6

Sherpa 1.0.6

A number of things are not working. Do not even try:

  • Parton shower in DIS--like situations, i.e. with only one incoming leg that showers.
  • Substructure of photons.
  • Laser backscattering beyond the region where CompAZ is valid (up to 500 GeV).

For process declarations a specific ordering is needed:

  • For electron-photon collisions make sure the photon is on the first beam, bunch and parton!
  • For electron-proton collisions make sure the electron is on the first beam, bunch and parton!

Download of alpha version Sherpa-1.0.6

All Sherpa downloads can be found on HepForge

To run Sherpa with LHAPDF Version 3 you need to extract the LHAPDF grid archive into the SHERPA-1.0.8/Run directory. (The file size is 40 MB!)

In the download archive you can also download a short primer on how to get started and how to use Sherpa.

Major changes with respect to Sherpa-1.0.5

  • The multi-cut treatment for the ME-PS merging described in hep-ph/0503281 has been implemented.
  • The underlying event has been tuned to fit the Tevatron Run I UE data.
  • The phase space integration has been improved further.
  • An interface to LHAPDF version 3 is now provided.
  • All bug-fixes and patches for version 1.0.5 are included.

Known problems/known bugs/FAQs

  • Problem: Makefile mismatch in module SHERPA-1.0
    Eventually leads to untraceable program crash.
    Fix: Apply patch file via

patch -p0 < patch_am

in the top level directory of your Sherpa installation

  • Problem: Package does not compile with GCC 4.0
    Fix: Apply patch file via

patch -p0 < patch_gcc

in the top level directory of your Sherpa installation.

Some test run output

After installing Sherpa and compiling it via the ./TOOLS/makeinstall script you can check your Sherpa implementation against some test run output we provide for the two default setups.

Electron photon collision at linear collider:

To obtain this process you simply have to type ./Sherpa in the Run directory of the SHERPA-1.0.6. package.

After executing ./makelibs just call ./Sherpa again and you should obtain the following output:

W+jet production at Tevatron:

To obtain this process you have to type ./Sherpa PATH=Tevatron1800 in the Run directory of the SHERPA-1.0.6. package.

After executing ./makelibs in the Tevatron1800 directory, execute ./Sherpa PATH=Tevatron1800 again and you should obtain the following output: