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diff --git a/History.txt b/History.txt
index 65ed4cf..8f63632 100644
--- a/History.txt
+++ b/History.txt
@@ -1,551 +1,554 @@
//==========================================================================
//
// History file for EvtGen
//
//===========================================================================
+21 Jan 2019 John Back
+ Correct B 4-momentum in EvtSLDiBaryonAmp for the BToDiBaryonlnupQCD model.
+
7th December 2018 John Back
Added the EvtBLLNuL (BLLNUL) model that generates rare B -> ell ell nu ell
decays, where ell = e or mu, courtesy of Anna Danilina and Nikolai Nikitin
(LHCb). Removed the EvtB2MuMuMuNu (BUTOMMMN) model, since its now replaced
by the more general BLLNuL one.
5th November 2018 John Back
Added the BToDiBaryonlnupQCD model for generating B to p N* l nu decays,
where N can be any (exited) charged baryon (spin 1/2 or 3/2), courtesy of
Mark Smith and Ryan Newcombe (LHCb), with added code optimisations.
17th October 2018 John Back
Added various decay models from LHCb EvtGenExtras package:
EvtBcVHad ("BC_VHAD"), Evtbs2llGammaMNT ("BSTOGLLMNT"),
Evtbs2llGammaISRFSR ("BSTOGLLISRFSR"), EvtbTosllMS ("BTOSLLMS"),
EvtbTosllMSExt ("BTOSLLMSEXT"), EvtLb2Baryonlnu ("Lb2Baryonlnu"),
EvtLb2plnuLCSR ("Lb2plnuLCSR"), EvtLb2plnuLQCD ("Lb2plnuLQCD"),
EvtFlatSqDalitz ("FLATSQDALITZ") and EvtPhspFlatLifetime
("PHSPFLATLIFETIME").
5th October 2018 John Back
Updated setupEvtGen.sh to work with the new HepForge Phabricator site.
13th March 2018 John Back
Updated EvtPythiaEngine to correctly handle updates of various particle
properties so that Pythia uses the same information as EvtGen (evt.pdl)
for the generic and alias PYTHIA decay model.
12th March 2018 John Back
Updated EvtBcXMuNu models (X = Scalar, Vector, Tensor) to generate
Bc to D0(star) mu nu decays, with associated form factors in EvtBCXFF,
courtesy of Aleksei Luchinskii (LHCb). Also generalised the calculation
of their maximum probabilities by reusing the CalcMaxProb method in
EvtSemiLeptonicAmp, which now allows for different Q^2 binning
(default remains at 25 bins).
R01-07-00-------------------------------------------------------------------
13th December 2017 John Back
New tag incorporating all changes below. Recommended external packages
are HepMC 2.06.09, pythia 8.230, Photos++ 3.61 and Tauola++ 1.1.6c,
as used in the setupEvtGen.sh script.
12th December 2017 John Back
Changed Pythia validation example decay files to use Pythia8 codes.
6th December 2017 John Back
Modified the examples to use DECAY.DEC (see 25th April 2016) instead of
DECAY_2010.DEC. Changed EvtExternalGenList to assume Pythia8 codes are
used in decay files by default, which is the case for DECAY.DEC. Also
updated the setupEvtGen.sh script to work with Pythia 8.2x versions.
29th November 2017 John Back
Modified EvtSVP, EvtVVP and EvtTVP models to handle both radiative and
two-lepton decays, courtesy of Aleksei Luchinskii (LHCb).
14th July 2017 John Back
Only create external generator objects if they don't already exist in
EvtExternalGenFactory. Modified configure script to work with Pythia 8.2x
5th July 2017 Michal Kreps
Register the VTOSLL model.
14th June 2017 John Back
Add isNeutralKaon() boolean function and corrected comments in EvtDDalitz.
8th May 2017 Michal Kreps
Fix bug in EvtbTosllVectorAmp to recognise Bs --> K*bar mu mu decay as
b --> d ll transition.
8th May 2017 Michal Kreps
Significantly simplify way how we decide on decay mode and daughters
ordering in DDalitz model. With new code by definition all orderings of
daughters in the decay file will yield same output.
4th May 2017 John Back
Further fixes to DDalitz particle ordering (including charge-conjugates):
Mode 5: D0 -> K- K0bar K+ and K+ K- K0bar
Mode 12: D0 -> pi0 pi- pi+ and pi+ pi0 pi-
Removed unneeded index ordering checks for mode 10 (D+ -> pi- pi+ pi+)
and mode 11 (Ds+ -> pi- pi+ pi+)
27th April 2017 John Back
Fixed DDalitz particle ordering for mode 7: D+ -> pi+ K- K+ and K+ pi+ K-
and their charge-conjugates
7th April 2017 John Back
Modified EvtGenExternal/EvtPythiaEngine to ensure that the EvtGen-based
instances of Pythia8 (for generic and alias decays) use the same
particle properties as defined by EvtGen, courtesy Patrick Robbe (LHCb).
5th April 2017 Michal Kreps
Fixed indexing in copy constructor of Evt3Rank3C, which would otherwise
produce an infinite loop; bug report from David Grellscheid.
3rd November 2016 John Back
Modified EvtFlatQ2 model to work for all B -> X lepton lepton modes, as
well as adding an extra phase space factor to correct for the dip at low
q^2, courtesy of Marcin Chrzaszcz & Thomas Blake (LHCb), which is enabled
by using "FLATQ2 1" instead of just "FLATQ2" in the decay file.
13th October 2016 John Back
Added the TauolaCurrentOption decfile keyword to select the hadronic
current in Tauola; default is the BaBar-tuned current option (int = 1).
EvtParticles can store double attributes using the functions
setAttributeDouble(name, double) and getAttributeDouble(name), which can
be useful for storing and retrieving amplitude weights, for example.
The analogous EvtParticle integer attribute interface remains unchanged:
setAttribute(name, int) and getAttribute(name).
13th September 2016 John Back
Modified EvtTauolaEngine to use internal Tauola spin matrices for
tau pair events by temporarily setting the PDG id of the mother as a
boson, keeping the same 4-momentum. The BaBar hadronic currents are now
used by default. Also added the ability to change some Tauola parameters
using the "Define" keyword in decay files. Added an example decay file
illustrating the new features: validation/TauolaFiles/Btautau.dec
9th September 2016 Michal Kreps
Reimplement code in EvtBTo3pi.F, EvtBTo3piMPP.F, EvtBTo3piP00.F and
EvtBToKpipi.F in C++ in order to remove dependence on Fortran compiler.
With this, there is no internal Fortran code in EvtGen.
R01-06-00-------------------------------------------------------------------
1st June 2016 John Back
New tag incorporating all changes below. Recommended external packages
are HepMC 2.06.09, pythia 8.186, Photos++ 3.61 and Tauola++ 1.1.5.
28th April 2016 Michal Kreps
For Ds+ --> 2pi+ pi- there was double counting of branching fraction
resulting in total branching fraction being 1.5 times larger than measured
one. Fix by revisiting submodes, which now fill total Ds --> 3pi.
25th April 2016 Michal Kreps
Added DECAY.DEC/XML, which contain updated semileptonic charm and beauty
branching fractions using the 2014 PDG, tuned to minimize disagreements
between measurements and EvtGen for both inclusive and exclusive decays.
Updated the evt.pdl particle properties file to the PDG 2014 edition.
Implemented new LQCD form factors for Lb --> L mu mu from arXiv paper
1602.01399 (EvtRareLbToLllFFlQCD); old LQCD form factors are removed.
18th March 2016 John Back
Fixed incorrect spinor algebra used in S1 -> 1/2 S2, 1/2 -> S3 S4 decays
in EvtDiracParticle::rotateToHelicityBasis() functions, courtesy of
Luis Miguel Garcia Martin and the IFIC Valencia LHCb group.
19th Feburary 2016 John Back
Fixed bug in the definition of the initial spinor term Sinit in
EvtRareLbToLll::HadronicAmpRS(), from Tom Blake (LHCb).
12th February 2016 John Back
From LHCb, added extensions to the EvtHQET2(FF) model for semitauonic
decays from Brian Hamilton, which needs a patch to EvtSemiLeptonicAmp
from Jack Wimberley to ensure that the q^2 range is physical when
finding the maximum amplitude probability.
2nd December 2015 John Back
From LHCb, added EvtKStopizmumu model for KS -> pi0 mu mu decays based on
JHEP08(1998)004, courtesy of Veronika Chobanova, Diego Martinez Santos
and Jeremy Dalseno. Added EvtConst::Fermi for Fermi coupling constant.
R01-05-00-------------------------------------------------------------------
21st October 2015 John Back
New tag incorporating all changes below. Recommended external packages
are HepMC 2.06.09, pythia 8.186, Photos++ 3.61 and Tauola++ 1.1.5.
Added the EvtB2MuMuMuNu model for simulating the very rare four-leptonic
decays B- -> mu+ mu- anti-nu_mu mu-, courtesy Nikolai Nikitin.
16th October 2015 John Back
Updated the configure script to automatically select the library names
for PHOTOS++; version 3.56 and below uses Fortran, version 3.61 and above
uses C++ only (default). Avoid using v3.60, since it does not work.
This needs the PHOTOS libraries built before EvtGen is configured.
Modified setupEvtGen.sh to use Photos++ v3.61.
7th October 2015 John Back
Updated EvtGenExternal/EvtPhotosEngine to check that additional particles
from the outgoing vertex are indeed (FSR) photons, since later versions of
PHOTOS introduce pair emission, where particles may not always be photons.
Added the genRootDecayChain.cc validation program to create ROOT files
containing information about the complete decay tree. Two example test
decay files BKstarGamma.dec and BuDst0rhop.dec can be used with this; the
first tests PHOTOS, the second looks at sequential decay chain storage.
The plotBKstarGamma.C ROOT macro can be used for B -> K* gamma plots.
2nd October 2015 John Back
Modified EvtSVPHelAmp and added a new EvtSVPHelCPMix model, implementing
the complete mixing phenomenology of Bs to vector gamma decays, courtesy
of Clara Remon (LHCb).
EvtD0mixDalitz code: cleanup, inverted q/p for decays of D0bar (simplifies
user decay files) and fixed y parameter bug, courtesy of Jordi Tico (LHCb).
Changed the initialisation order of the infrared cut-off in EvtPhotosEngine.
This actually has no effect, since the exponentiation function sets it to the
same 1e-7 value, but it's now in the correct order if we need to update it.
Removed all remaining obsolete pragma (Win32) warnings from some classes.
23rd September 2015 Michal Kreps
Reimplement the real Spence function in C++ and removed its fortran
implementation.
15th September 2015 Michal Kreps
Fixed accessed uninitialised memory in EvtPDL.cpp, line 213.
Modified the configure and setupEvtGen.sh scripts to work on Mac; needed
Mac compilation patch files added to the new "platform" subdirectory.
10th September 2015 John Back
Updated setupEvtGen.sh to use the recommended external packages:
HepMC 2.06.09, pythia 8.186, Photos++ 3.56 and Tauola++ 1.1.5.
Fixed form-factor calculations for the BTOSLLBALL model 6 used to generate
b -> sll decays, courtesy of Christoph Langenbruch and David Loh (LHCb).
Affects B->K*ll, B->rholl and B->omegall, particularly the electron modes.
In the validation directory, added runPhotosTest.sh for testing FSR in
Upsilon(4S) -> e+ e- decays, and changed the plot comparison scripts to
use the 2nd directory "oldRootFiles" (which could be a soft-link) for
including ROOT histograms made from a previous version of EvtGen.
27th August 2015 John Back
Added Mersenne-Twister random number generator (RNG) EvtMTRandomEngine.
It requires c++11 compiler features (>= gcc 4.7), which should
automatically be enabled by the configure script. Introduced the
preprocessor environment variable EVTGEN_CPP11 for c++11 features.
EvtMTRandomEngine is the default RNG for the validation and test examples
if c++11 features are enabled.
Added a phase-space test validation/genPHSP.sh and PhaseSpacePlots.C to
visually check the flatness of Dalitz plots in order to ensure that the
RNG is not producing biased results that depend on particle ordering.
Added the models EvtbsToLLLLAmp and EvtbsToLLLLHyperCP for
B0_q -> l+ l- l+ l- decays (SM and one supersymmetric scenario),
courtesy of Nikolai Nikitin and Konstantin Toms. Documentation provided
in doc/evt_BQTOLLLL_model.pdf and doc/evt_BQTOLLLLHYPERCP_model.pdf.
Changed the installation and set-up script name to be just setupEvtGen.sh;
it uses the VERSION variable to specify the required tag. List of tags
are available using either "svn ls -v http://svn.cern.ch/guest/evtgen/tags"
or by going to http://svn.cern.ch/guest/evtgen/tags in a web browser.
12th June 2015 John Back
Changed the width of chi_b1 in evt.pdl from 9.8928 GeV (!) to zero.
1st May 2015 John Back
Added Bc -> scalar ell nu (EvtBcSMuNu) and Bc -> tensor ell nu
(EvtBcTMuNu) decays, courtesy of Jack Wimberley, LHCb. Also included the
chi_c1 mode for EvtBcVMuNu.
R01-04-00-------------------------------------------------------------------
2nd April 2015 John Back
Removed the EvtStdlibRandomEngine class since this can produce biases
to kinematic distributions when one or more of the daughters is a
resonance, such as B0 -> K pi psi (thanks to Antonio Augusto Alves Jr
who discovered this issue). EvtSimpleRandomEngine is now the default
random number generator in the validation and test examples.
Incorporated several additions and modifications from LHCb:
a) From Michal Kreps, Tom Blake & Christoph Langenbruch,
added rare Lb --> Lambda^(*) ell ell models described in
arXiv:1108.6129, with various form factors from Gutsche et al.
(arXiv:1301.3737) and lattice QCD (arXiv:1212.4827)
b) From Andrew Crocombe, implemented Bs --> K* form factors
from Ball-Zwicky and z-parametrization form factors from
arXiv:1006.4945 for EvtbTosllBallFF
c) Christoph Langenbruch fixed the Bs -> phi ll form factors in
EvtbTosllBallFF; T3 showed a non-physical pole at very low
q2 which significantly affected the electron mode
d) From Michal Kreps, removed semicolons from wrong places to
clear warnings when compiled with the "-pedantic" option.
9th October 2014 John Back
Change svnweb.cern.ch to svn.cern.ch in the setup script.
1st April 2014 John Back
In EvtReport, modified the logging output severity status flags
to have the "EVTGEN_" prefix, e.g. INFO becomes EVTGEN_INFO.
The global report() function has been renamed to EvtGenReport().
31st March 2014 John Back
Added the ability to store named attributes for EvtParticles in the
form of a map<string, int>. The setAttribute(name, value) stores the
required value, while getAttribute(name) retrieves the integer value.
This is used in EvtPhotosEngine to specify the final-state radiation
"FSR" attribute to 1 for any additional photons (EvtPhotonParticles)
created by Photos++. It also stores the "ISR" attribute, but this
is always set to zero, since only FSR photons are created.
If the named attribute doesn't exist, then getAttribute() returns zero.
29th January 2014 Daniel Craik
Removed mass assertion on GS shape in EvtDalitzReso to allow it to also
be used for charged rho resonances.
27th January 2014 John Back
Minor corrections to Vub models to remove further gcc 4.8 warnings.
Updated configure script to work for MacOS clang (from Genser team).
R01-03-00-------------------------------------------------------------------
9th January 2014 John Back
New tag version "1.3.0", incorporating all changes below.
Replaced auto-install script to work with this version as well as
the latest versions of all external generator packages.
Updated README to mention the new CERN-based web pages for Photos++
and Tauola++.
8th January 2014 John Back
Fix gcc 4.6 and 4.8 compilation warnings, courtesy of
Patrick Robbe (LHCb); main changes are removal of unused variables.
Changed the EvtPythiaEngine class and configure script to use new
Pythia 8 header locations; Pythia 8.180 or above is now required.
7th January 2014 John Back
Modified EvtBCVFF to correct the Kiselev form factors from
Jack Wimberley (LHCb).
9th October 2013 Daniel Craik
Added Gounaris-Sakurai and Gaussian shapes to EvtGenericDalitz
and set sensible defaults for LASS parameters.
19th September 2013 John Back
Modified EvtGenExternal/EvtPythiaEngine to keep track of any new
particles that are added to the default Pythia database to avoid
duplicating particle/anti-particle entries that could override
previously defined Pythia decay chains.
18th September 2013 John Back
Added Mac OS flags for the configure script and src/Makefile.
15th July 2013 Daniel Craik
Added flag to turn on scaling of LASS amplitude by M/q in EvtDalitzReso
15th July 2013 Daniel Craik
EvtParserXML now accepts file names containing environment variables,
exponential non-resonant shape in EvtDalitzReso now defined as exp(-alpha*m^2),
LASS shape in EvtDalitzReso now takes a cutoff parameter
4th July 2013 Daniel Craik
Added LASS, exponential non-resonant and linear non-resonant shapes to EvtGenericDalitz.
3rd July 2013 Daniel Craik
Fixed auto-install script for R01-02-00.
1st July 2013 Daniel Craik
Added auto-install script for R01-02-00.
R01-02-00-------------------------------------------------------------------
15th May 2013 John Back
New tag, version "1.2.0", incorporating all changes below.
14th May 2013 Michal Kreps
Added Blatt-Weisskopf barrier factors up to L=5 in
EvtGenBase/EvtBlattWeisskopf::compute().
14th May 2013 John Back
Added additional entries (appended at the end) to the evt.pdl particle
data file courtesy of Romulus Godang and Belle II colleagues.
14th March 2013 John Back
Added the method EvtParticle::getPDGId() to get the PDG integer for a
particle directly (which just calls EvtPDL::getStdHep()).
Added a check in EvtPhotosEngine::doDecay to skip Photos if a given
particle has too many daughters (>= 10) to avoid a problem with a
hard coded upper limit in the Photos PHOENE subroutine.
2nd February 2013 Daniel Craik
Updated EvtDalitzTable to estimate probMax when it is missing from a
Dalitz model.
1st February 2013 John Back
Added the ability to read in Pythia 6 commands in ascii decay files in
EvtDecayTable::readDecayFile (this was already possible in xml files).
Modified the Photos++ engine default settings to be more suited to B
decays (from LHCb defaults).
31st January 2013 John Back
Added the ability to read in Pythia 8 commands in ascii decay files
in EvtDecayTable::readDecayFile. They can be set using the syntax:
"PythiaTypeParam module:variable=value", where Type = Generic, Alias or
Both for specifying whether the parameter is for the generic or alias
Pythia decay engines (or both). The 2nd argument must not contain any
spaces. Fixed the list of commands strings being used in the
EvtPythiaEngine class (i.e. Pythia parameters that can be set via decay
files).
31st January 2013 Daniel Craik
Added named parameters to various decay models.
30th January 2013 John Back
Fixed some of the parameter arguments used in the EvtSVSCPiso model.
24th January 2013 John Back
Set the Photos++ and Tauola++ models to use the EvtGen random number
engine when useEvtGenRandom is set to true in the EvtExternalGenList
constructor.
23rd January 2013 John Back
Added EvtGenExternal/EvtPythiaRandom to allow the use of the EvtGen
random number engine to also be used for the random engine for Pythia 8.
Added a boolean (useEvtGenRandom, default = true) within the
EvtExternalGenList constructor to use this feature.
18th December 2012 John Back
Corrected some wrong daughter ordering assignments for decay modes 5 and
12 in EvtDDalitz. Updated validation/DalitzDecays.xml to also contain
D decay mode 12, as well as various modes that may use K_S0 and K_L0.
Added validation/genDDalitzModes.sh and updated
validation/compareDalitz.C to do a complete comparison of the D Dalitz
modes with the xml versions.
11th December 2012 Daniel Craik
Updated the Xml parser to support named model parameters. Updated the
generic Dalitz model to use named model parameters as an example.
15th October 2012 John Back
Make EvtSimpleRandomEngine inherit from EvtRandomEngine to avoid
crash in EvtGen.cpp when no random engine is defined
(from Bjoern Spruck).
R01-01-00-------------------------------------------------------------------
4th October 2012 John Back
New tag, version "1.1.0", incorporating all changes below.
Provide proper default constructors for EvtVector4R and
EvtPhotonParticle. Modified the validation and test code to also
compile/link in the case of no external generators being included.
3rd October 2012 John Back
Corrected the t3 vector form factor values for the Ball-Zwicky '05
model (modelId = 6) in EvtbTosllBallFF::getVectorFF(), which
were set to t3tilde instead.
18th September 2012 John Back
Moved the external generator engines to a new sub-directory
EvtGenExternal. Building the code now creates 2 libraries:
libEvtGen.so (Base+Models) and libEvtGenExternal.so.
This allows anyone to ignore using the new external generators
if required (by not creating/loading the 2nd library).
Added prefix option to the configure script/Makefile to allow the user
to specify an installation directory for the include files, libraries,
DECAY.DEC and evt.pdl files (for Genser).
14th September 2012 Michal Kreps
Fixed the calculation of the angle between decay planes in the function
EvtKine::EvtDecayAngleChi. Fixed typo in EvtLb2Lll decay model. Only
some NP scenarious could be affected, SM one is definitely unaffected.
13th September 2012 John Back
Added the use of the environment variables EVTGEN_PHOTOS, EVTGEN_PYTHIA
and EVTGEN_TAUOLA to specify if the Photos, Pythia and/or Tauola engine
classes are used or not. These variables are set by the configure script,
depending if the library paths are specified for these generators.
R01-00-01--------------------------------------------------------------------
12th September 2012 John Back
New tag incorporating all changes below, since R01-00-00.
11th September 2012 John Back
Modified the Photos and Tauola engine classes to use the new
Photospp and Tauolapp namespaces that are present in the latest
versions of Photos++(3.5) and Tauola++(1.0.7). Updated the configure file
to get the correct location of the Tauola++ include files.
Added the D0->pi+pi-pi0 decay mode in EvtDDalitz from Marco Gersabeck
and Frederic Dreyer (LHCb).
Added new decay models/classes from Alexey Luchinsky (LHCb):
EvtBcVMuNu, EvtTVP, EvtWnPi, EvtSVP, EvtXPsiGamma, EvtBcVNpi
29th June 2012 John Back
Corrected mass(squared) variables filled in the Dalitz TTree in
validation/genExampleRootFiles.
15th May 2012 Daniel Craik
Updated EvtD0gammaDalitz to deal with D mesons from neutral B->DK
Added save function to validation/compareDalitz.C.
11th May 2012 Daniel Craik
Replaced BaBar specific configuration for BlattWeisskopf birth factors.
Updated XML conversion script to handle new configuration.
Fixed some bugs in the XML conversion script related to particle
modifications.
9th May 2012 Daniel Craik
Added latex documentation for xml decay files.
2nd May 2012 Daniel Craik
Added resDaughters attribute to the Dalitz resonance xml tag to
simplify defining symmetric resonances. Updated validation xml files to
use the new functionality.
27th April 2012 Daniel Craik
Upgraded EvtGenericDalitz to use EvtDalitzReso for resonances.
Added validation to compare EvtGenericDalitz to all 11 EvtDDalitz modes.
Added a root macro to quickly compare two Dalitz decays for validation.
24th April 2012 John Back
Solved two bugs in the EvtD0gammaDalitz model (from Jordi Tico, LHCb):
configuration of the conjugated model, and using only the B charge
to determine the model used, not the D flavour.
17th April 2012 Daniel Craik
Updated the GenericDalitz validation code to use the same probMax
values as DDalitz. Added XML decay file parsing to EvtGen::readUDecay.
Dec files are still the default.
30th March 2012 John Back
Update maximum probability values in EvtDDalitz::initProbMax()
for all DDalitz modes.
23rd March 2012 John Back
Added the EvtEta2MuMuGamma decay model from LHCb.
21st March 2012 John Back
Added EvtD0gammaDalitz decay model from LHCb.
20th March 2012 Daniel Craik
Added backwards compatibility for Pythia 6 commands in the XML
configuration. Updated decay file conversion tool to convert JetSetPar
lines to pythia6Param tags.
19th March 2012 Daniel Craik
Added infrastructure to pass commands to external generators.
XML config now takes Pythia8 configuration commands.
16th March 2012 Daniel Craik
Added the ability to define particles from the PDL for Dalitz decay
resonances instead of defining mass, width and spin seperately. Renamed
the lifetime attribute of Dalitz decay resonaces to width to avoid
confusion. Added further validation code for the generic Dalitz model.
15th March 2012 Daniel Craik
Added validation code for xml decay files and the generic Dalitz model.
R01-00-00 ------------------------------------------------------------------
6th March 2012 John Back
First official version for Genser (evtgen 1.0.0) that includes
support for external generators: Pythia8, Photos++ and Tauola++.
This also includes a preliminary version of creating Dalitz plot
decay models using EvtGenericDalitz.
diff --git a/src/EvtGenModels/EvtSLDiBaryonAmp.cpp b/src/EvtGenModels/EvtSLDiBaryonAmp.cpp
index 5154ddf..0ca4952 100644
--- a/src/EvtGenModels/EvtSLDiBaryonAmp.cpp
+++ b/src/EvtGenModels/EvtSLDiBaryonAmp.cpp
@@ -1,305 +1,306 @@
//--------------------------------------------------------------------------
//
// Environment:
// This software is part of the EvtGen package developed jointly
// for the BaBar and CLEO collaborations. If you use all or part
// of it, please give an appropriate acknowledgement.
//
// Copyright Information: See EvtGen/COPYRIGHT
// Copyright (C) 1998 Caltech, UCSB
//
// Module: EvtSLDiBaryonAmp.cc
//
// Description: Routine to implement semileptonic decays to dibaryonic final
// state. Details of amplitude calculation to be found in arXiv:1107.0801.
//
// Modification history:
//
// Mark Smith July 18, 2017 Module created
// Heavily adapted from the EvtSLBaryonAmp module
// Ryan Newcombe May 2018 Added capability for Rarita-Schwinger
// daughters. Indexing convention follows EvtSLBaryonAmp
// John B Oct 2018 Optimise amplitude calculation
//
//--------------------------------------------------------------------------
#include "EvtGenBase/EvtPatches.hh"
#include "EvtGenBase/EvtDiracSpinor.hh"
#include "EvtGenBase/EvtGammaMatrix.hh"
#include "EvtGenBase/EvtId.hh"
#include "EvtGenBase/EvtParticle.hh"
#include "EvtGenBase/EvtPDL.hh"
#include "EvtGenBase/EvtRaritaSchwinger.hh"
#include "EvtGenBase/EvtReport.hh"
#include "EvtGenBase/EvtVector4C.hh"
#include "EvtGenBase/EvtVector4R.hh"
#include "EvtGenModels/EvtBToDiBaryonlnupQCDFF.hh"
#include "EvtGenModels/EvtSLDiBaryonAmp.hh"
using std::endl;
EvtSLDiBaryonAmp::EvtSLDiBaryonAmp(EvtBToDiBaryonlnupQCDFF* formFactors) :
ffModel(formFactors)
{
}
void EvtSLDiBaryonAmp::CalcAmp(EvtParticle *parent, EvtAmp& amp) const {
static EvtId EM = EvtPDL::getId("e-");
static EvtId MUM = EvtPDL::getId("mu-");
static EvtId TAUM = EvtPDL::getId("tau-");
static EvtId EP = EvtPDL::getId("e+");
static EvtId MUP = EvtPDL::getId("mu+");
static EvtId TAUP = EvtPDL::getId("tau+");
// The baryon, charged lepton and neutrino daughters
EvtParticle* baryon1 = parent->getDaug(0);
EvtParticle* baryon2 = parent->getDaug(1);
EvtParticle* lepton = parent->getDaug(2);
EvtParticle* neutrino = parent->getDaug(3);
// 4-momenta
+ EvtVector4R p0(parent->mass(), 0.0, 0.0, 0.0);
EvtVector4R p1 = baryon1->getP4();
EvtVector4R p2 = baryon2->getP4();
EvtVector4R pSum = p1 + p2;
- EvtVector4R p = parent->getP4() - pSum;
+ EvtVector4R p = p0 - pSum;
EvtVector4R pDiff = p2 - p1;
// Particle id's
EvtId Id1 = baryon1->getId();
EvtId Id2 = baryon2->getId();
EvtId l_num = lepton->getId();
EvtSpinType::spintype type1 = EvtPDL::getSpinType(Id1);
EvtSpinType::spintype type2 = EvtPDL::getSpinType(Id2);
// Number of chiral components of the baryon spinors
int N1 = EvtSpinType::getSpinStates(type1);
int N2 = EvtSpinType::getSpinStates(type2);
// Invariant mass of the two baryon particle system
double m_dibaryon = sqrt(pSum.mass2());
// Complex number i
EvtComplex I(0, 1);
// Lepton currents, same for all baryon options
EvtVector4C l1, l2;
if (l_num == EM || l_num == MUM || l_num == TAUM) {
l1 = EvtLeptonVACurrent(lepton->spParent(0), neutrino->spParentNeutrino());
l2 = EvtLeptonVACurrent(lepton->spParent(1), neutrino->spParentNeutrino());
} else if (l_num == EP || l_num == MUP || l_num == TAUP) {
l1 = EvtLeptonVACurrent(neutrino->spParentNeutrino(), lepton->spParent(0));
l2 = EvtLeptonVACurrent(neutrino->spParentNeutrino(), lepton->spParent(1));
} else {
EvtGenReport(EVTGEN_ERROR,"EvtSLDiBaryonAmp") << "Wrong lepton number"<<endl;
}
// Sigma summation terms. Store in a vector to avoid recalculating this for each i,j loop
std::vector<EvtGammaMatrix> sigmaVect;
for (int k = 0; k < 4; k++) {
EvtGammaMatrix sigmaSum;
for (int index = 0; index < 4; index++) {
sigmaSum += EvtGammaMatrix::sigmaLower(k, index)*p.get(index);
}
sigmaVect.push_back(sigmaSum);
}
// Vector and axial-vector terms; these get reset within the loop over k
EvtVector4C term1;
EvtVector4C term2;
// Handle case of two Dirac-type daughters, e.g. ppbar, pN(1440)
if (type1 == EvtSpinType::DIRAC && type2 == EvtSpinType::DIRAC) {
// Form factor parameters
EvtBToDiBaryonlnupQCDFF::FormFactors FF;
ffModel->getDiracFF(parent, m_dibaryon, FF);
// First baryon
for (int i = 0; i < N1; i++) {
// Get the baryon spinor in the B rest frame. Also just use u and not i*u,
// since the imaginary constant factor is not needed for the probability
EvtDiracSpinor u = baryon1->spParent(i);
// Second baryon
for(int j = 0; j < N2; j++) {
EvtDiracSpinor v = baryon2->spParent(j);
EvtDiracSpinor g5v = EvtGammaMatrix::g5()*v;
// Calculate and set the 4 complex amplitude components
for (int k = 0; k < 4; k++) {
EvtGammaMatrix sigmaSum = sigmaVect[k];
// Need two terms owing to the requirements of using the product operators
EvtDiracSpinor vgTermA = (FF.G1*EvtGammaMatrix::g(k) + I*FF.G2*sigmaSum)*g5v;
EvtDiracSpinor vgTermB = (FF.G3*p.get(k) + FF.G4*pSum.get(k) + FF.G5*pDiff.get(k))*g5v;
// S current = ubar adjoint*vTerms
term1.set(k, EvtLeptonSCurrent(u, vgTermA+vgTermB));
EvtDiracSpinor vfTermA = (FF.F1*EvtGammaMatrix::g(k) + I*FF.F2*sigmaSum)*v;
EvtDiracSpinor vfTermB = (FF.F3*p.get(k) + FF.F4*pSum.get(k) + FF.F5*pDiff.get(k))*v;
// S current = ubar adjoint*vTerms
term2.set(k, EvtLeptonSCurrent(u, vfTermA+vfTermB));
}
// Set the decay amplitude element
EvtVector4C term = term1 - term2;
amp.vertex(i,j,0,l1*term);
amp.vertex(i,j,1,l2*term);
} // j
} // i
} else if ((type1 == EvtSpinType::DIRAC && type2 == EvtSpinType::RARITASCHWINGER) ||
(type1 == EvtSpinType::RARITASCHWINGER && type2 == EvtSpinType::DIRAC)) {
// Handle the case of one Dirac-type daughter (not including the leptons), e.g. one proton, and one
// Rarita-Schwinger-type (spin 3/2) daughter e.g. B -> p N(1520) l nu
// Form factor parameters
EvtBToDiBaryonlnupQCDFF::FormFactors FF;
ffModel->getRaritaFF(parent, m_dibaryon, FF);
if (type1 == EvtSpinType::DIRAC) {
// First baryon is Dirac
for (int i = 0; i < N1; i++) {
// Get the baryon spinor in the B rest frame. Also just use u and not i*u,
// since the imaginary constant factor is not needed for the probability
EvtDiracSpinor u = baryon1->spParent(i);
// Second baryon is RS-type
for (int j = 0; j < N2; j++) {
EvtRaritaSchwinger vRS = baryon2->spRSParent(j);
// Store products of g5 with the spinor components as well as
// EvtDiracSpinors to limit constructor calls inside k loop
std::vector<EvtDiracSpinor> g5vVect, vVect;
for (int index = 0; index < 4; index++) {
EvtDiracSpinor v = vRS.getSpinor(index);
EvtDiracSpinor g5v = EvtGammaMatrix::g5()*v;
g5vVect.push_back(g5v);
vVect.push_back(v);
}
// Calculate and set the 4 complex amplitude components
for (int k = 0; k < 4; k++) {
EvtGammaMatrix sigmaSum = sigmaVect[k];
EvtDiracSpinor g5v = g5vVect[k];
EvtDiracSpinor v = vVect[k];
// Need two terms owing to the requirements of using the product operators
EvtDiracSpinor vgTermA = (FF.G1*EvtGammaMatrix::g(k) + I*FF.G2*sigmaSum)*g5v;
EvtDiracSpinor vgTermB = (FF.G3*p.get(k) + FF.G4*pSum.get(k) + FF.G5*pDiff.get(k))*g5v;
// S current = ubar adjoint*vTerms
term1.set(k, EvtLeptonSCurrent(u, vgTermA+vgTermB));
EvtDiracSpinor vfTermA = (FF.F1*EvtGammaMatrix::g(k) + I*FF.F2*sigmaSum)*v;
EvtDiracSpinor vfTermB = (FF.F3*p.get(k) + FF.F4*pSum.get(k) + FF.F5*pDiff.get(k))*v;
// S current = ubar adjoint*vTerms
term2.set(k, EvtLeptonSCurrent(u, vfTermA+vfTermB));
}
// Set the decay amplitude element
EvtVector4C term = term1 - term2;
amp.vertex(i,j,0,l1*term);
amp.vertex(i,j,1,l2*term);
} // j
} // i
} else if (type2 == EvtSpinType::DIRAC) {
// Same as before, but where the first daughter is RS-type, e.g. B -> N(1520) p l nu
// First baryon is RS
for (int i = 0; i < N1; i++) {
// Get the baryon spinor in the B rest frame
EvtRaritaSchwinger uRS = baryon1->spRSParent(i);
// Store EvtDiracSpinors to reduce constructor calls inside k loop
std::vector<EvtDiracSpinor> uVect;
for (int index = 0; index < 4; index++) {
// Just use u and not i*u, since the imaginary constant factor is not needed
// for the probability
EvtDiracSpinor u = uRS.getSpinor(index);
uVect.push_back(u);
}
// Second baryon is Dirac
for (int j = 0; j < N2; j++) {
EvtDiracSpinor v = baryon2->spParent(j);
EvtDiracSpinor g5v = EvtGammaMatrix::g5()*v;
// Calculate and set the 4 complex amplitude components
for (int k = 0; k < 4; k++) {
EvtGammaMatrix sigmaSum = sigmaVect[k];
EvtDiracSpinor u = uVect[k];
// Need two terms owing to the requirements of using the product operators
EvtDiracSpinor vgTermA = (FF.G1*EvtGammaMatrix::g(k) + I*FF.G2*sigmaSum)*g5v;
EvtDiracSpinor vgTermB = (FF.G3*p.get(k) + FF.G4*pSum.get(k) + FF.G5*pDiff.get(k))*g5v;
// S current = ubar adjoint*vTerms
term1.set(k, EvtLeptonSCurrent(u, vgTermA+vgTermB));
EvtDiracSpinor vfTermA = (FF.F1*EvtGammaMatrix::g(k) + I*FF.F2*sigmaSum)*v;
EvtDiracSpinor vfTermB = (FF.F3*p.get(k) + FF.F4*pSum.get(k) + FF.F5*pDiff.get(k))*v;
// S current = ubar adjoint*vTerms
term2.set(k, EvtLeptonSCurrent(u, vfTermA+vfTermB));
}
// Set the decay amplitude element
EvtVector4C term = term1 - term2;
amp.vertex(i,j,0,l1*term);
amp.vertex(i,j,1,l2*term);
} // j
} // i
} // RS daughter check
} // Have Dirac and RS baryons
}

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