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 # Changelog
 
 This is the log for changes to the HEJ program. Further changes to the HEJ API
 are documented in [`Changes-API.md`](Changes-API.md). If you are using HEJ as a
 library, please also read the changes there.
 
 ## Version 2.2
 
 This release adds support for the new processes:
 
 * Wp+Wp with jets.
 * Wm+Wm with jets.
 
 In addition, there are new options when running HEJ:
 
 * Enable NLO truncation for use in HEJ@NLO predictions.
 * Require a lowpt jet, used for running lowpt separately.
 
 This release includes minor changes which affect users of HEJ as a library (see
 [`Changes-API.md`](Changes-API.md)). Compilation now requires a
 compiler supporting C++17.
 
+### 2.2.3
+
+* Fix `HEJ-config --optional-dependencies`.
+
 ### 2.2.2
 
 * Fixed calculation of unordered gluon emission in Z+jets production.
 
 ### 2.2.1
 
 * Fixed calculation of extremal qqbar contribution to W+jets production.
 
 ### 2.2.0
 
 #### New Processes
 
 * Resummation for WpWp/WmWm with jets, including interference between
   configurations.
 * Significantly improved description of Higgs boson plus jet production:
   - Processes with extremal Higgs boson emission are now treated as
     leading-log.
   - Resummation is now enabled for Higgs boson production with a
     single jet.
 * `HEJFOG` can generate multiple jets together with a charged
   lepton-antilepton pair via a virtual Z boson or photon.
 
 #### Updates to configuration file
 
 * With the new option `off-shell tolerance` HEJ repairs the momenta
   of massless particles that are slightly off-shell and incoming
   particles with small but non-vanishing transverse momenta.
 * Introduced new event types `unknown` and `invalid` under the `event
   treatment` option. `unknown` indicates processes that are not
   recognised by HEJ. `invalid` is reserved for unphysical processes.
 * Introduced new event treatment `abort` for aborting the program when
   an undesired event type is encountered.
 * Removed the deprecated settings `min extparton pt` and
   `max ext soft pt fraction`.
 * Removed the deprecated `analysis` setting.
 
 #### Changes to input/output
 * Event reader supports event input from named pipes (fifo)
 
 ## Version 2.1
 
 This release adds support for two new processes:
 
 * W boson with jets.
 * Jets with a charged lepton-antilepton pair via a virtual Z boson or photon.
 
 In addition, the complete set of first subleading processes (unordered
 gluon, central and extremal quark-antiquark pair) is implemented for
 pure jets and W + jets, see
 [arXiv:2012.10310](https://arxiv.org/abs/2012.10310). Unordered gluon emission
 is also supported for Higgs boson + jets and Z boson/photon + jets.
 
 This release include many changes to the code, which affect users of
 HEJ as a library (see [`Changes-API.md`](Changes-API.md)).
 
 ### 2.1.3
 
 * Updated documentation.
 
 ### 2.1.2
 
 * Updated `cxxopts.hpp` dependency.
 
 ### 2.1.1
 
 * Fixed invalid iterator accesses.
 * Reorganised automated tests.
 * Updated documentation.
 
 ### 2.1.0
 
 #### New Processes
 * Resummation for W bosons with jets
   - New subleading processes `extremal qqbar` & `central qqbar` for a quark and
     anti-quark in the final state, e.g. `g g => u d_bar Wm g` (the other
     subleading processes also work with W's)
   - `HEJFOG` can generate multiple jets together with a (off-shell) W bosons
     decaying into lepton & neutrino
 * Resummation for jets with a charged lepton-antilepton pair via a
   virtual Z boson or photon. Includes the `unordered` subleading process.
 * Resummation can now be performed on all subleading processes within pure
   jets also. This includes `unordered`, `extremal qqbar` and `central
   qqbar` processes.
 
 #### More Physics implementation
 * Partons now have a Colour charge
   - Colours are read from and written to LHE files
   - For reweighted events the colours are created according to leading colour in
     the FKL limit
 * Use relative fraction for soft transverse momentum in tagging jets (`soft pt
   regulator`) as new (optional) parameter.
   - This supersedes `min extparton pt`, which is marked **deprecated** and will
     be removed in version 2.2.0
   - This is a direct replacement for the old `max ext soft pt fraction`, which
     is also **deprecated**.
 * Changed the redistribution of the momenta of soft emissions. Now also bosons
   can take part of the recoil (previously only jets).
 
 #### Updates to Runcard
 * Allow multiplication and division of multiple scale functions e.g.
   `H_T/2*m_j1j2`
 * Grouped `event treatment` for subleading channels together in runcard
   - Rename `non-HEJ` processes to `non-resummable`
 * Read electro-weak constants from input
   - new mandatory setting `vev` to change vacuum expectation value
   - new mandatory settings `particle properties` to specify mass & width of
     bosons
   - `HEJFOG`: decays are now specified in `decays` setting (previously under
     `particle properties`)
 * Allow loading multiple analyses with `analyses`. The old `analysis` (with "i")
   is marked **deprecated**.
 * Optional setting to specify maximal number of Fixed Order events (`max
   events`, default is all)
 * Allow changing the regulator lambda in input (`regulator parameter`, only for
   advanced users)
 
 #### Changes to Input/Output
 * Added support to read & write `hdf5` event files suggested in
   [arXiv:1905.05120](https://arxiv.org/abs/1905.05120) (needs
   [HighFive](https://github.com/BlueBrain/HighFive))
 * Support input with average weight equal to the cross section (`IDWTUP=1 or 4`)
 * Support unmodified Les Houches Event Files written by Sherpa with
   `cross section = sum(weights)/sum(trials)`
 * Analyses now get general run information (`LHEF::HEPRUP`) in the
   constructor. **This might break previously written, external analyses!**
   - external analyses should now be created with
     `make_analysis(YAML::Node const & config, LHEF::HEPRUP const & heprup)`
 * Support `rivet` version 3 with both `HepMC` version 2 and 3
   - Multiple weights with `rivet 3` will only create one `.yoda` file (instead
     of one per weight/scale)
 * Added option to unweight only resummation events
   (`unweight: {type: resummation}`)
 * Added option for partially unweighting resummation events, similar to
   the fixed-order generator.
 * Improved unweighting algorithm.
 * Follow HepMC convention for particle Status codes: incoming = 11,
   decaying = 2, outgoing = 1 (unchanged)
 
 #### Miscellaneous
 * Print cross sections at end of run
 * Added example analysis & scale to `examples/`. Everything in `examples/` will
   be build when the flag `-DBUILD_EXAMPLES=TRUE` is set in `cmake`.
 * Dropped support for HepMC 3.0.0, either HepMC version 2 or >3.1 is required
   - It is now possible to write out both HepMC 2 and HepMC 3 events at the same
     time
 * Require LHADPF version 6. Dropped support for all other versions.
 * Use `git-lfs` for raw data in test (`make test` now requires `git-lfs`)
 * Currents are now generated with [`FORM`](https://github.com/vermaseren/form)
   - `FORM` is included as a `git submodule`, use `git submodule update --init`
     to download `FORM`
 * Create [Sphinx](http://sphinx-doc.org/) and [Doxygen](http://doxygen.org/)
   documentation by `make sphinx` or `make doxygen` in your `build/` folder
 
 ## Version 2.0
 
 First release of HEJ 2. Complete code rewrite compared to HEJ 1. Improved
 matching to Fixed Order ([arXiv:1805.04446](https://arxiv.org/abs/1805.04446)).
 Implemented processes: Higgs boson with jets (FKL and unordered gluon emission,
 with finite quark mass loop,
 [arXiv:1812.08072](https://arxiv.org/abs/1812.08072)), and pure jets (only FKL).
 See [arXiv:1902.08430](https://arxiv.org/abs/1902.08430)
 
 ## 2.0.7
 
 * Added missing `#include` directives.
 
 ### 2.0.6
 
 * Fixed compiling rivet when YODA headers are _outside_ of rivet directory.
 
 ### 2.0.5
 
 * Fixed event classification for input not ordered in rapidity.
 
 ### 2.0.4
 
 * Fixed wrong path of `HEJ_INCLUDE_DIR` in `hej-config.cmake`.
 
 ### 2.0.3
 
 * Fixed parsing of (numerical factor) * (base scale) in configuration.
 * Don't change scale names, but sanitise Rivet output file names instead.
 
 ### 2.0.2
 
 * Changed scale names to `"_over_"` and `"_times_"` for proper file names (was
   `"/"` and `"*"` before).
 
 ### 2.0.1
 
 * Fixed name of fixed-order generator in error message.
 
 ### 2.0.0
 
 * First release.