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diff --git a/README b/README
index 42bdf15..d0b6837 100644
--- a/README
+++ b/README
@@ -1,198 +1,206 @@
RELEASE NOTES
=============
Please see History.txt for a detailed list of changes to this package.
The major points comparing this version with the 2009 release are the following:
1. This version requires HepMC (version 2.04 and above) for storing event structures
of particle decays, and can also use Pythia 8 (version 8.180 and above is required)
and the C++ interfaced packages Photos (version 3.5.2 and above) and Tauola
(version 1.0.7 and above). These external generators are included via engine
classes in the new sub-directory EvtGenExternal.
Two libraries can be created for EvtGen:
i) libEvtGen.so contains the EvtGenBase and EvtGenModel core code/decay models,
ii) libEvtGenExternal.so contains _only_ the code within EvtGenExternal.
This means that the external generator interface can be ignored by not
loading/creating the 2nd library libEvtGenExternal.so.
In the installation instructions below, it is possible to select which external
generators you want to use. Note, however, that the generic "DECAY.DEC" file
contains Pythia decays, and if Pythia is not included in the build, these
decays are not generated (in fact, they would need a new decay model specified).
Likewise, if Photos is not included, there will be no radiative corrections
done for particle decays.
To use the external generators, use the following code:
#include "EvtGenExternal/EvtExternalGenList.hh"
#include "EvtGenBase/EvtAbsRadCorr.hh"
#include "EvtGenBase/EvtDecayBase.hh"
// Set up the default external generator list: Photos, Pythia and/or Tauola
EvtExternalGenList genList;
EvtAbsRadCorr* radCorrEngine = genList.getPhotosModel();
std::list<EvtDecayBase*> extraModels = genList.getListOfModels();
// Create the EvtGen generator object
EvtGen myGenerator("decayFile.dec", "evt.pdl", randomEnginePointer,
radCorrEngine, &extraModels);
//If you don't want to use external generators, use the following:
//EvtGen myGenerator("decayFile.dec", "evt.pdl", randomEnginePointer);
The files Pythia8_README.txt and Tauola_README.txt have more details about
using the new Pythia 8 and Tauola generators (called via the PYTHIA and TAUOLA
"decay.dec" model names). The new Photos generator is still called via the PHOTOS
"decay.dec" model name.
It is now possible to use alias particle decays for the Pythia 8 model.
Two Pythia 8 instances are used in EvtPythiaEngine for normal and aliased decays.
Since the underlying code for Photos and Tauola is still Fortran, it is only
possible to have one (unique) instance of each of these external generators.
This can only be fixed if these packages are converted to pure C++ code.
2. This version of EvtGen is effectively a merger of the latest LHCb and BaBar
EvtGenBase and EvtGenModels code. Various decay models have been added, and
there have been a range of bug fixes.
3. There is also a new Dalitz decay class model "GENERIC_DALITZ"
(EvtGenModels/EvtGenericDalitz.cpp), that should be used instead of EvtDDalitz.
The generic Dalitz model uses xml files to configure the resonance amplitude
parameters (instead of being hardcoded in EvtDDalitz):
Decay D+
1.0 K- pi+ pi+ GENERIC_DALITZ MyDalitzParameters.xml;
Enddecay
Examples of xml Dalitz parameter files are given in the sub-directory
validation/DalitzFiles, e.g. see DalitzDecays.xml.
4. It is possible to use decay files in xml format. Use the python script
convertDecayFile.py for converting decay files to the new format.
The src/EvtGen.cpp constructor has an additional boolean argument useXml that
needs to be set to true if xml decay files are to be used (default is useXml=false).
For example, DECAY_2010.XML is the xml version of DECAY_2010.DEC.
5. Bug fixes for Bs mixing decay/CP violation amplitudes.
Added the capability to use either coherent or incoherent mixing in EvtCPUtil.
One or the other can be chosen as the mixing method for the B system by
choosing 0 (coherent) or 1 (incoherent) for the last integer argument
in the EvtGen() constructor.
BUILDING THE CODE
=================
To build the EvtGen code, first make sure that there is a valid (C++) version
of HepMC avilable:
HepMC http://hepmc.web.cern.ch//hepmc/
HepMC is used to store particle information.
Optionally, it is possible to use other external generators, such as Pythia8
(for Pythia decays in the DECAY.DEC file, for example), Photos (for
radiative corrections) and Tauola (for tau decays):
Pythia8 http://home.thep.lu.se/~torbjorn/Pythia.html
Photos http://photospp.web.cern.ch/photospp/
Tauola http://tauolapp.web.cern.ch/tauolapp/
All of these packages have instructions for building them.
Once these packages are available, build the EvtGen release by creating a build directory
alongside the EvtGen source directory (assumed here to be called evtgen.git) and running:
cmake ../evtgen.git <options>
within the EvtGen build directory, using the following options:
-DCMAKE_INSTALL_PREFIX=<location> : Location in which to install EvtGen (highly recommended)
-DHEPMC2_ROOT_DIR=<location> : Location of HepMC install directory
- While linking with HepMC is mandatory, depending on
- your environment the installation may be detected
+ Depending on your environment the installation may be detected
automatically. Failing this, you can specify the
location via this option.
+ -DEVTGEN_HEPMC3=OFF : Link with HepMC3 instead of HepMC2
+ -DHEPMC3_ROOT_DIR=<location> : Location of HepMC3 install directory
+ Depending on your environment the installation may be detected
+ automatically. Failing this, you can specify the
+ location via this option, or to instruct cmake to look for the instllation
+ using -DCMAKE_PREFIX_PATH=<location> or -DHepMC3_DIR=<location>/share/HepMC3/cmake/
+
+
-DEVTGEN_PYTHIA=ON : Enable linking with Pythia 8
-DPYTHIA8_ROOT_DIR=<location> : Location of Pythia8 install directory
As with HepMC this may be automatically detected
depending on your build environment, otherwise the
location can be specified via this option.
-DEVTGEN_PHOTOS=ON : Enable linking with Photos++
-DPHOTOSPP_ROOT_DIR=<location> : Location of Photos++ install directory
As with HepMC this may be automatically detected
depending on your build environment, otherwise the
location can be specified via this option.
-DEVTGEN_TAUOLA=ON : Enable linking with Tauola++
-DTAUOLAPP_ROOT_DIR=<location> : Location of Tauola++ install directory
As with HepMC this may be automatically detected
depending on your build environment, otherwise the
location can be specified via this option.
+ -DEVTGEN_BUILD_DOC=OFF : Enable building of documentation in 'test' directory
-DEVTGEN_BUILD_TESTS=ON : Enable building executables in 'test' directory
-DEVTGEN_BUILD_VALIDATIONS=ON : Enable building executables in 'validation' directory
Then compile and (optionally, although highly recommended) install the EvtGen code using
make
make install
This should create the libraries lib/libEvtGen.so and lib/libEvtGenExternal.so,
as well as the archives lib/archive/libEvtGen.a and lib/archive/libEvtGenExternal.a
(the "EvtGenExternal" library/archive will not be created if linking is not enabled for
any of the external generators).
A series of validation and test executables are also created (discussed below). The
CMakeLists.txt file in these two directories can be used as a template for building any
user executables.
The build/install will also create CMake config files that allow the library targets to be
easily imported into other projects.
To use Pythia 8, the environment variable PYTHIA8DATA needs to be set to the location
of the corresponding xml documentation directory, which also contains the default values
for particle decays and models: <location of Pythia 8 base directory>/xmldoc
Code validation
===============
The validation sub-directory contains code validation test cases for Pythia, Tauola
and B mixing models.
Note that these executables also depend on ROOT, which is only used to create ntuples and
plots for the validation examples.
The script genAllDecayExamples.sh runs other scripts that generate a range of decay
modes using the genExampleRootFiles.cc program. The script compareAllDecays.sh runs
a range of scripts that creates comparison plots using the compareRootFiles.cc program.
For now, the comparisons use the same plots, but each of the "compare.sh" files can
be edited to compare any two versions of ROOT data created by the
genExampleRootFiles.cc program.
The testCPVDecays.cc program runs a test for the B mixing decay model.
Examples
========
Some examples are provided in the test sub-directory.
Note that these executables also depend on ROOT, which is only used to create ntuples and
plots for the validation examples.
Running the script "./do_tests" will run a series of EvtGen examples.
Example decay files are in the test/exampleFiles sub-directory.
diff --git a/cmake/Modules/ExternalDependencies.cmake b/cmake/Modules/ExternalDependencies.cmake
index 64c7ab2..e17037f 100644
--- a/cmake/Modules/ExternalDependencies.cmake
+++ b/cmake/Modules/ExternalDependencies.cmake
@@ -1,38 +1,38 @@
set(HEPMC2_ROOT_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../external/HepMC" CACHE PATH "Location of HepMC 2 installation")
set(HEPMC3_ROOT_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../external/HepMC3" CACHE PATH "Location of HepMC 3 installation")
if(DEFINED ENV{PYTHIAVER})
set(PYTHIA8_ROOT_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../external/pythia$ENV{PYTHIAVER}" CACHE PATH "Location of Pythia8 installation")
else()
set(PYTHIA8_ROOT_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../external/pythia8230" CACHE PATH "Location of Pythia8 installation")
endif()
set(Photos++_ROOT_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../external/PHOTOS" CACHE PATH "Location of Photos++ installation")
set(Tauola++_ROOT_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../external/TAUOLA" CACHE PATH "Location of Tauola++ installation")
set(PHOTOSPP_ROOT_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../external/PHOTOS" CACHE PATH "Location of Photos++ installation/alternative spelling")
set(TAUOLAPP_ROOT_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../external/TAUOLA" CACHE PATH "Location of Tauola++ installation/alternative spelling")
#Here we are looking for HepMC interfaces. Note that the OPTIONAL_COMPONENTS includes the libraries that appear only in the new TAUOLA/PHOTOS
if (EVTGEN_HEPMC3)
-find_package(HepMC3 REQUIRED)
+find_package(HepMC3 REQUIRED HINTS ${HEPMC3_ROOT_DIR})
if(${EVTGEN_PYTHIA})
find_package(Pythia8 REQUIRED)
endif()
if(${EVTGEN_PHOTOS})
find_package(Photos++ REQUIRED COMPONENTS pp ppHepMC3)
endif()
if(${EVTGEN_TAUOLA})
find_package(Tauola++ REQUIRED COMPONENTS Fortran CxxInterface HepMC3)
endif()
else()
find_package(HepMC2 REQUIRED)
if(${EVTGEN_PYTHIA})
find_package(Pythia8 REQUIRED)
endif()
if(${EVTGEN_PHOTOS})
find_package(Photos++ REQUIRED OPTIONAL_COMPONENTS pp ppHepMC CxxInterface Fortran)
endif()
if(${EVTGEN_TAUOLA})
find_package(Tauola++ REQUIRED COMPONENTS Fortran CxxInterface OPTIONAL_COMPONENTS HepMC)
endif()
endif()

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