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ChangeLog -- Summary of changes to the WHIZARD package
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Use svn log to see detailed changes.

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	Version 3.0.1+
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2021-07-08
	RELEASE: version 3.0.1

2021-07-06
	MPI parallelization now comes with two incarnations:
	- standard MPI parallelization ("simple", default)
	- MPI with load balancer ("load")
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2021-07-05
	Bug fix for C++17 default compilers w/ HepMC3/ROOT interface

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2021-07-02
	Improvement for POWHEG matching:
	- implement massless recoil case
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	- enable reading in existing POWHEG grids
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	- support kinematic cuts at generator level

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2021-07-01
	Distinguish different cases of photons in NLO EW corrections

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2021-06-21
	Option to keep negative PDF entries or set them zero

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2021-05-31
	Full LCIO MC production files can be properly recasted

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2021-05-24
        Use defaults for UFO models without propagators.py

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2021-05-21
	Bug fix: prevent invalid code for UFO models containing hyphens

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2021-05-20
	UFO files with scientific notation float constants allowed
	UFO files: max. n-arity of vertices bound by process multiplicity

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##################################################################
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2021-04-27
	RELEASE: version 3.0.0
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2021-04-20
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	Minimal required OCaml version is now 4.05.0.
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	Bug fix for tau polarization from stau decays

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2021-04-19
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	NLO EW splitting functions and collinear remnants completed
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	Photon recombination implemented

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2021-04-14
	Bug fix for vertices/status codes with HepMC2/3 event format
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2021-04-08
	Correct Lorentz statistics for UFO model with Majorana fermions

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2021-04-06
	Bug fix for rare script failure in system_dependencies.f90.in
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	Kappa factor for quartic Higgs coupling in SM_ac(_CKM) model
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2021-04-04
	Support for UFO extensions in SMEFTSim 3.0

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2021-02-25
	Enable VAMP and VAMP2 channel equivalences for NLO integrations

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2021-02-04
	Bug fix if user does not set a prefix at configuration

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2020-12-10
	Generalize NLO calculations to non-CMS lab frames

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2020-12-08
	Bug fix in expanded p-wave form factor for top threshold

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2020-12-06
	Patch for macOS Big Sur shared library handling due to libtool;
	   the patch also demands gcc/gfortran 11.0/10.3/9.4/8.5

2020-12-04
	O'Mega only inserts non-vanishing couplings from UFO models

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2020-11-21
	Bug fix for fractional hypercharges in UFO models

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2020-11-11
	Enable PYTHIA6 settings for eh collisions (enable-pythia6_eh)

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2020-11-09
	Correct flavor assignment for NLO fixed-order events

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2020-11-05
	Bug fix for ISR handler not working with unstable particles

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2020-10-08
	Bug fix in LHAPDF interface for photon PDFs

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2020-10-07
	Bug fix for structure function setup with asymmetric beams

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2020-10-02
	Python/Cython layer for WHIZARD API

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2020-09-30
	Allow mismatches of Python and name attributes in UFO models

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2020-09-26
	Support for negative PDG particles from certain UFO models

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2020-09-24
	Allow for QNUMBERS blocks in BSM SLHA files

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2020-09-22
	Full support for compilation with clang(++) on Darwin/macOS
	More documentation in the manual
	Minor clean-ups

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2020-09-16
	Bug fix enables reading LCIO events with LCIO v2.15+

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##################################################################

2020-09-16
	RELEASE: version 2.8.5

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2020-09-11
	Bug fix for H->tau tau transverse polarization with PYTHIA6
	   (thanks to Junping Tian / Akiya Miyamoto)

2020-09-09
	Fix a long standing bug (since 2.0) in the calculation of color
	factors when particles of different color were combined in a
	particle class.  NB: O'Mega never produced a wrong number,
	it only declared all processes as invalid.

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2020-09-08
	Enable Openloops matrix element equivalences for optimization

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2020-09-02
	Compatibility fix for PYTHIA v8.301+ interface

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2020-09-01
	Support exclusive jet clustering in ee for Fastjet interface

##################################################################

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2020-08-30
	RELEASE: version 3.0.0_beta
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2020-08-27
	Major revision of NLO distributions and events for
	   processes with structure functions:
	- Use parton momenta/flavors (instead of beams) for events
	- Bug fix for Lorentz boosts and Lorentz frames of momenta
	- Bug fix: apply cuts to virtual NLO component in correct frame
	- Correctly assign ISR radiation momenta in data structures
	- Refactoring on quantum numbers for NLO event data structures
	- Functional tests for hadron collider NLO distributions
	- many minor bug fixes regarding NLO hadron collider physics

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2020-08-11
	Bug fix for linking problem with OpenMPI

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2020-08-07
	New WHIZARD API: WHIZARD can be externally linked as a
	  library, added examples for Fortran, C, C++ programs

##################################################################

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2020-07-08
	RELEASE: version 2.8.4

2020-07-07
	Bug fix: steering of UFO Majorana models from WHIZARD

##################################################################

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2020-07-06
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	Combined integration also for hadron collider processes at NLO
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2020-07-05
	Bug fix: correctly steer e+e- FastJet clustering algorithms
	Major revision of NLO differential distributions and events:
	- Correctly assign quantum numbers to NLO fixed-order events
	- Correctly assign weights to NLO fixed-order events for
	     combined simulation
	- Cut all NLO fixed-order subevents in event groups individually
	- Only allow "sigma" normalization for NLO fixed-order events
	- Use correct PDF setup for NLO counter events
	- Several technical fixes and updates of the NLO testsuite

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##################################################################
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2020-07-03
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	RELEASE: version 2.8.3

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2020-07-02
	Feature-complete UFO implementation for Majorana fermions

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2020-06-22
	Running width scheme supported for O'Mega matrix elements

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2020-06-20
	Adding H-s-s coupling to SM_Higgs(_CKM) models

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2020-06-17
	Completion of ILC 2->6 fermion extended test suite

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2020-06-15
	Bug fix: PYTHIA6/Tauola, correctly assign tau spins for stau decays

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2020-06-09
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	Bug fix: correctly update calls for additional VAMP/2 iterations
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	Bug fix: correct assignment for tau spins from PYTHIA6 interface

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2020-06-04
	Bug fix: cascades2 tree merge with empty subtree(s)

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2020-05-31
	Switch $epa_mode for different EPA implementations

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2020-05-26
	Bug fix: spin information transferred for resonance histories

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2020-04-13
	HepMC: correct weighted events for non-xsec event normalizations

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2020-04-04
	Improved HepMC3 interface: HepMC3 Root/RootTree interface
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2020-03-24
	ISR: Fix on-shell kinematics for events with ?isr_handler=true
	   (set ?isr_handler_keep_mass=false for old behavior)

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2020-03-11
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	Beam masses are correctly passed to hard matrix element for CIRCE2
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	EPA with polarized beams: double-counting corrected
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##################################################################

2020-03-03
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	RELEASE: version 3.0.0_alpha
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2020-02-25
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	Bug fix: Scale and alphas can be retrieved from internal event format to
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	   external formats

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2020-02-17
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	Bug fix: ?keep_failed_events now forces output of actual event data
	Bug fix: particle-set reconstruction (rescanning events w/o radiation)
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2020-01-28
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	Bug fix for left-over EPA parameter epa_e_max (replaced by epa_q_max)
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2020-01-23
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	Bug fix for real components of NLO QCD 2->1 processes
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2020-01-22
        Bug fix: correct random number sequencing during parallel MPI event
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	   generation with rng_stream
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2020-01-21
	Consistent distribution of events during parallel MPI event generation

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2020-01-20
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	Bug fix for configure setup for automake v1.16+
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2020-01-18
	General SLHA parameter files for UFO models supported

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2020-01-08
	Bug fix: correctly register RECOLA processes with flavor sums

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2019-12-19
	Support for UFO customized propagators
	O'Mega unit tests for fermion-number violating interactions

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2019-12-10
	For distribution building: check for graphviz/dot
	   version 2.40 or newer

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2019-11-21
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	Bug fix: alternate setups now work correctly
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	Infrastructure for accessing alpha_QED event-by-event
	Guard against tiny numbers that break ASCII event output
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	Enable inverse hyperbolic functions as SINDARIN observables
	Remove old compiler bug workarounds
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2019-11-20
	Allow quoted -e argument, implemented -f option

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2019-11-19
	Bug fix: resonance histories now work also with UFO models
	Fix in numerical precision of ASCII VAMP2 grids

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2019-11-06
	Add squared matrix elements to the LCIO event header

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2019-11-05
	Do not include RNG state in MD5 sum for CIRCE1/2

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2019-11-04
	Full CIRCE2 ILC 250 and 500 GeV beam spectra added
	Minor update on LCIO event header information

2019-10-30
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	NLO QCD for final states completed
	When using Openloops, v2.1.1+ mandatory

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2019-10-25
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	Binary grid files for VAMP2 integrator

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##################################################################
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2019-10-24
	RELEASE: version 2.8.2

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2019-10-20
	Bug fix for HepMC linker flags

2019-10-19
	Support for spin-2 particles from UFO files

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2019-09-27
	LCIO event format allows rescan and alternate weights

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2019-09-24
	Compatibility fix for OCaml v4.08.0+

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##################################################################
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2019-09-21
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	RELEASE: version 2.8.1

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2019-09-19
	Carriage return characters in UFO models can be parsed
	Mathematica symbols in UFO models possible
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	Unused/undefined parameters in UFO models handled
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2019-09-13
	New extended NLO test suite for ee and pp processes

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2019-09-09
	Photon isolation (separation of perturbative and fragmentation
	   part a la Frixione)

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2019-09-05
	Major progress on NLO QCD for hadron collisions:
	- correctly assign flavor structures for alpha regions
	- fix crossing of particles for initial state splittings
	- correct assignment for PDF factors for real subtractions
	- fix kinematics for collinear splittings
	- bug fix for integrated virtual subtraction terms

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2019-09-03
	b and c jet selection in cuts and analysis

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2019-08-27
	Support for Intel MPI

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2019-08-20
	Complete (preliminary) HepMC3 support (incl.
	   backwards HepMC2 write/read mode)

2019-08-08
	Bug fix: handle carriage returns in UFO files (non-Unix OS)

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##################################################################

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2019-08-07
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	RELEASE: version 2.8.0

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2019-07-31
	Complete WHIZARD UFO interface:
	- general Lorentz structures
	- matrix element support for general color factors
	- missing features: Majorana fermions and SLHA

2019-07-20
	Make WHIZARD compatible with OCaml 4.08.0+

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2019-07-19
	Fix version testing for LHAPDF 6.2.3 and newer
	Minimal required OCaml version is now 4.02.3.

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2019-04-18
	Correctly generate ordered FKS tuples for alpha regions
	   from all possible underlying Born processes

2019-04-08
	Extended O'Mega/Recola matrix element test suite

2019-03-29
	Correct identical particle symmetry factors for FKS subtraction

2019-03-28
	Correct assertion of spin-correlated matrix
	   elements for hadron collisions

2019-03-27
	Bug fix for cut-off parameter delta_i for
	   collinear plus/minus regions

##################################################################
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2019-03-27
	RELEASE: version 2.7.1

2019-02-19
	Further infrastructure for HepMC3 interface (v3.01.00)

2019-02-07
	Explicit configure option for using debugging options
	Bug fix for performance by removing unnecessary debug operations

2019-01-29
	Bug fix for DGLAP remnants with cut-off parameter delta_i

2019-01-24
	Radiative decay neu2 -> neu1 A added to MSSM_Hgg model

##################################################################
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2019-01-21
	RELEASE: version 2.7.0

2018-12-18
	Support RECOLA for integrated und unintegrated subtractions

2018-12-11
	FCNC top-up sector in model SM_top_anom

2018-12-05
	Use libtirpc instead of SunRPC on Arch Linux etc.

2018-11-30
	Display rescaling factor for weighted event samples with cuts

2018-11-29
	Reintroduce check against different masses in flavor sums
	Bug fix for wrong couplings in the Littlest Higgs model(s)

2018-11-22
	Bug fix for rescanning events with beam structure

2018-11-09
	Major refactoring of internal process data

2018-11-02
	PYTHIA8 interface

2018-10-29
        Flat phase space parametrization with RAMBO (on diet) implemented

2018-10-17
	Revise extended test suite

2018-09-27
	Process container for RECOLA processes

2018-09-15
	Fixes by M. Berggren for PYTHIA6 interface

2018-09-14
	First fixes after HepForge modernization

##################################################################
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2018-08-23
	RELEASE: version 2.6.4

2018-08-09
	Infrastructure to check colored subevents

2018-07-10
	Infrastructure for running WHIZARD in batch mode

2018-07-04
	MPI available from distribution tarball

2018-06-03
	Support Intel Fortran Compiler under MAC OS X

2018-05-07
	FKS slicing parameter delta_i (initial state) implementend

2018-05-03
	Refactor structure function assignment for NLO

2018-05-02
	FKS slicing parameter xi_cut, delta_0 implemented

2018-04-20
	Workspace subdirectory for process integration (grid/phs files)
	Packing/unpacking of files at job end/start
	Exporting integration results from scan loops

2018-04-13
	Extended QCD NLO test suite

2018-04-09
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	Bug fix for Higgs Singlet Extension model
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2018-04-06
	Workspace subdirectory for process generation and compilation
	--job-id option for creating job-specific names

2018-03-20
	Bug fix for color flow matching in hadron collisions
	   with identical initial state quarks

2018-03-08
	Structure functions quantum numbers correctly assigned for NLO

2018-02-24
	Configure setup includes 'pgfortran' and 'flang'

2018-02-21
	Include spin-correlated matrix elements in interactions

2018-02-15
	Separate module for QED ISR structure functions

##################################################################
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2018-02-10
	RELEASE: version 2.6.3

2018-02-08
	Improvements in memory management for PS generation

2018-01-31
	Partial refactoring: quantum number assigment NLO
	Initial-state QCD splittings for hadron collisions

2018-01-25
	Bug fix for weighted events with VAMP2

2018-01-17
	Generalized interface for Recola versions 1.3+  and 2.1+

2018-01-15
	Channel equivalences also for VAMP2 integrator

2018-01-12
	Fix for OCaml compiler 4.06 (and newer)

2017-12-19
	RECOLA matrix elements with flavor sums can be integrated

2017-12-18
	Bug fix for segmentation fault in empty resonance histories

2017-12-16
	Fixing a bug in PYTHIA6 PYHEPC routine by omitting CMShowers
	  from transferral between PYTHIA and WHIZARD event records

2017-12-15
	Event index for multiple processes in event file correct

##################################################################
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2017-12-13
	RELEASE: version 2.6.2

2017-12-07
	User can set offset in event numbers

2017-11-29
	Possibility to have more than one RECOLA process in one file

2017-11-23
	Transversal/mixed (and unitarized) dim-8 operators

2017-11-16
	epa_q_max replaces epa_e_max (trivial factor 2)

2017-11-15
	O'Mega matrix element compilation silent now

2017-11-14
	Complete expanded P-wave form factor for top threshold

2017-11-10
	Incoming particles can be accessed in SINDARIN

2017-11-08
	Improved handling of resonance insertion, additional parameters

2017-11-04
	Added Higgs-electron coupling (SM_Higgs)

##################################################################
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2017-11-03
	RELEASE: version 2.6.1

2017-10-20
	More than 5 NLO components possible at same time

2017-10-19
	Gaussian cutoff for shower resonance matching

2017-10-12
	Alternative (more efficient) method to generate
	   phase space file

2017-10-11
	Bug fix for shower resonance histories for processes
	   with multiple components

2017-09-25
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	Bug fix for process libraries in shower resonance histories
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2017-09-21
	Correctly generate pT distribution for EPA remnants

2017-09-20
	Set branching ratios for unstable particles also by hand

2017-09-14
	Correctly generate pT distribution for ISR photons

##################################################################
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2017-09-08
	RELEASE: version 2.6.0

2017-09-05
	Bug fix for initial state NLO QCD flavor structures
	Real and virtual NLO QCD hadron collider processes
	   work with internal interactions

2017-09-04
	Fully validated MPI integration and event generation

2017-09-01
	Resonance histories for shower: full support
	Bug fix in O'Mega model constraints
	O'Mega allows to output a parsable form of the DAG

2017-08-24
	Resonance histories in events for transferral
	   to parton shower (e.g. in ee -> jjjj)

2017-08-01
	Alpha version of HepMC v3 interface
	   (not yet really functional)

2017-07-31
	Beta version for RECOLA OLP support

2017-07-06
	Radiation generator fix for LHC processes

2017-06-30
	Fix bug for NLO with structure
	   functions and/or polarization

2017-06-23
	Collinear limit for QED corrections works

2017-06-17
	POWHEG grids generated already during integration

2017-06-12
	Soft limit for QED corrections works

2017-05-16
	Beta version of full MPI parallelization (VAMP2)
	Check consistency of POWHEG grid files
	Logfile config-summary.log for configure summary

2017-05-12
	Allow polarization in top threshold

2017-05-09
	Minimal demand automake 1.12.2
	Silent rules for make procedures

2017-05-07
	Major fix for POWHEG damping
	Correctly initialize FKS ISR phasespace

##################################################################
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2017-05-06
	RELEASE: version 2.5.0

2017-05-05
	Full UFO support (SM-like models)
	Fixed-beam ISR FKS phase space

2017-04-26
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	QED splittings in radiation generator
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2017-04-10
	Retire deprecated O'Mega vertex cache files

##################################################################
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2017-03-24
	RELEASE: version 2.4.1

2017-03-16
	Distinguish resonance charge in phase space channels
	Keep track of resonance histories in phase space
	Complex mass scheme default for OpenLoops amplitudes

2017-03-13
	Fix helicities for polarized OpenLoops calculations

2017-03-09
	Possibility to advance RNG state in rng_stream

2017-03-04
	General setup for partitioning real emission
	   phase space

2017-03-06
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	Bug fix on rescan command for converting event files
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2017-02-27
	Alternative multi-channel VEGAS implementation
	   VAMP2: serial backbone for MPI setup
	Smoothstep top threshold matching

2017-02-25
	Single-beam structure function with
	   s-channel mapping supported
	Safeguard against invalid process libraries

2017-02-16
	Radiation generator for photon emission

2017-02-10
	Fixes for NLO QCD processes (color correlations)

2017-01-16
	LCIO variable takes precedence over LCIO_DIR

2017-01-13
	Alternative random number generator
	   rng_stream (cf. L'Ecuyer et al.)

2017-01-01
	Fix for multi-flavor BLHA tree
	   matrix elements

2016-12-31
	Grid path option for VAMP grids

2016-12-28
	Alpha version of Recola OLP support
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2016-12-27
	Dalitz plots for FKS phase space

2016-12-14
	NLO multi-flavor events possible

2016-12-09
	LCIO event header information added

2016-12-02
	Alpha version of RECOLA interface
772
	Bug fix for generator status in LCIO
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2016-11-28
	RELEASE: version 2.4.0

2016-11-24
780
	Bug fix for OpenLoops interface: EW scheme
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	   is set by WHIZARD
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	Bug fixes for top threshold implementation
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2016-11-11
	Refactoring of dispatching
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2016-10-18
	Bug fix for LCIO output

2016-10-10
	First implementation for collinear soft terms
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2016-10-06
	First full WHIZARD models from UFO files
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2016-10-05
	WHIZARD does not support legacy gcc 4.7.4 any longer

2016-09-30
	Major refactoring of process core and NLO components
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2016-09-23
	WHIZARD homogeneous entity: discarding subconfigures
	  for CIRCE1/2, O'Mega, VAMP subpackages; these are
	  reconstructable by script projectors
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2016-09-06
	Introduce main configure summary
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2016-08-26
	Fix memory leak in event generation
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2016-08-25
	RELEASE: version 2.3.1

2016-08-19
	Bug fix for EW-scheme dependence of gluino propagators

2016-08-01
	Beta version of complex mass scheme support

2016-07-26
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	Fix bug in POWHEG damping for the matching
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2016-07-21
	RELEASE: version 2.3.0

2016-07-20
	UFO file support (alpha version) in O'Mega
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2016-07-13
	New (more) stable of WHIZARD GUI
	Support for EW schemes for OpenLoops
	Factorized NLO top decays for threshold model
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2016-06-15
	Passing factorization scale to PYTHIA6
	Adding charge and neutral observables

2016-06-14
	Correcting angular distribution/tweaked kinematics in
	   non-collinear structure functions splittings
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2016-05-10
	Include (Fortran) TAUOLA/PHOTOS for tau decays via PYTHIA6
	   (backwards validation of LC CDR/TDR samples)

2016-04-27
	Within OpenLoops virtuals: support for Collier library
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2016-04-25
	O'Mega vertex tables only loaded at first usage
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2016-04-21
	New CJ15 PDF parameterizations added
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2016-04-21
	Support for hadron collisions at NLO QCD
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2016-04-05
	Support for different (parameter) schemes in model files
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2016-03-31
	Correct transferral of lifetime/vertex from PYTHIA/TAUOLA
	  into the event record
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2016-03-21
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	New internal implementation of polarization
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	  via Bloch vectors, remove pointer constructions
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2016-03-13
	Extension of cascade syntax for processes:
	  exclude propagators/vertices etc. possible
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2016-02-24
	Full support for OpenLoops QCD NLO matrix
	  elements, inclusion in test suite
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2016-02-12
	Substantial progress on QCD NLO support
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2016-02-02
	Automated resonance mapping for FKS subtraction
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2015-12-17
	New BSM model WZW for diphoton resonances
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##################################################################
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2015-11-22
	RELEASE: version 2.2.8

2015-11-21
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	Bug fix for fixed-order NLO events
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2015-11-20
	Anomalous FCNC top-charm vertices
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2015-11-19
	StdHEP output via HEPEVT/HEPEV4 supported
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2015-11-18
	Full set of electroweak dim-6 operators included
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2015-10-22
	Polarized one-loop amplitudes supported
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2015-10-21
	Fixes for event formats for showered events

2015-10-14
	Callback mechanism for event output
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2015-09-22
	Bypass matrix elements in pure event sample rescans
	StdHep frozen final version v5.06.01 included internally
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2015-09-21
	configure option --with-precision to
	  demand 64bit, 80bit, or 128bit Fortran
	  and bind C precision types
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2015-09-07
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	More extensive tests of NLO
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	   infrastructure and POWHEG matching
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2015-09-01
	NLO decay infrastructure
	User-defined squared matrix elements
	Inclusive FastJet algorithm plugin
	Numerical improvement for small boosts
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2015-08-11
	RELEASE: version 2.2.7
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2015-08-10
	Infrastructure for damped POWHEG
	Massive emitters in POWHEG
	Born matrix elements via BLHA
	GoSam filters via SINDARIN
	Minor running coupling bug fixes
	Fixed-order NLO events

2015-08-06
	CT14 PDFs included (LO, NLO, NNLL)

2015-07-07
	Revalidation of ILC WHIZARD-PYTHIA event chain
	Extended test suite for showered events
	Alpha version of massive FSR for POWHEG
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2015-06-09
	Fix memory leak in interaction for long cascades
	Catch mismatch between beam definition and CIRCE2 spectrum
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2015-06-08
	Automated POWHEG matching: beta version
	Infrastructure for GKS matching
	Alpha version of fixed-order NLO events
	CIRCE2 polarization averaged spectra with
	   explicitly polarized beams
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2015-05-12
	Abstract matching type: OO structure for matching/merging
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2015-05-07
	Bug fix in event record WHIZARD-PYTHIA6 transferral
	Gaussian beam spectra for lepton colliders
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2015-05-02
	RELEASE: version 2.2.6

2015-05-01
	Models for (unitarized) tensor resonances in VBS
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2015-04-28
	Bug fix in channel weights for event generation.
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2015-04-18
	Improved event record transfer WHIZARD/PYTHIA6

2015-03-19
	POWHEG matching: alpha version
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2015-02-27
	RELEASE: version 2.2.5

2015-02-26
	Abstract types for quantum numbers
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