Version 1.1.1 includes all bugfixes for previous versions as well as new ones.

# Sherpa 1.1.1

Version 1.1.1 includes all bugfixes for previous versions as well as new ones (see Changelog below).

The Sherpa package and a manual for getting started, can be downloaded here:

A Changelog for important differences between the previous version and this version is provided below.

:!: Please note that you still have to apply the patches provided below after unpacking the tarball.

# Known problems/known bugs/FAQs

• The compilation of Sherpa on Intel Mac computers may fail due to backtracing not being diabled correctly. Fix: Apply patch file via 'patch -p0 < intel_mac.patch' in the top level directory of your Sherpa installation and recompile with "TOOLS/makeinstall".
• The TOOLS/update_datfiles script was missing in the release tarball. You can download it here: {{update_datfiles.sh}}.
• Some incoming particles had the status 1 (active) instead of 2 (decayed) when underlying event was turned on (this should only cause problems if your analysis framework chokes on this). Fix: Apply patch file via 'patch -p0 < particles-status.patch' in the top level directory of your Sherpa installation and recompile with "TOOLS/makeinstall".
• Runs with activated Underlying Event might stall with "WARNING in Phase_Space_Handler::WeightedEvent?() : too many trials". Fix: Apply patch file via 'patch -p0 < mpi-stall.patch' in the top level directory of your Sherpa installation and recompile with "TOOLS/makeinstall".

# Changelog

• none

## Bugfixes

• Bugfix for overwriting of particle properties in BSM models.
• Bugfix for "missing flavour" crash when initializing libraries with CKM matrix elements.
• Bugfixes for all-in-one-file setup reading.
• Bugfix for crash of underlying event with some PDFs from LHAPDF.
• Bugfix in parton shower for non-CKKW setups (cures problems with 0 jet setups).
• Bugfix in mass smearing of hadron decays (cures multiplicity problem in pp).
• Some compile fixes for gcc 4.2
• Adjust installation routine for non-standard LHAPDF installations, where the PDFsets are not located in $LHAPDFDIR/share/lhapdf/PDFsets, but somewhere else in$LHAPDFDIR.
• Improvements in the TOOLS/update_datfiles script, which handles the update of dat-files written for 1.0.11.

## New features

(no effect on standard processes, tested)

• Add EPA spectrum for p -> p \gamma
• Update for effective MSSM-higgs gluon couplings; Lorentz structures for A0gg vertices

# Remarks

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!

A few non-standard setups 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).