Rivet release 2.4.0

Posted October 7, 2015 by Rivet Developers ‐ 2 min read

This new release of Rivet adds a host of new features and 12 new analyses, including first 13 TeV data!

We’re very pleased to announce the release of Rivet 2.4.0 and an accompanying release of version 1.5.5 of the YODA histogramming package.

New features:

  • 12 new analyses, including first 13 TeV data!
  • The WFinder has been further improved to make the best information hypothesis of neutrino kinematics without needing to rely on “detecting” a particular neutrino with a zero mass hypothesis – this avoids a too-large energy (and hence mass) being set due to out-of-acceptance particles.
  • The MissingMomentum projection and FourMomentum have acquired extra methods to help with 3-momentum balance operations like converting visible momentum into missing momentum without accidentally getting a negative energy or having to modify the individual vector components.
  • A function has been added to ZFinder to retrieve all fiducial dressed leptons, for example to allow vetoing on a third one.
  • By request, you can now pass an arbitrary Cut to the Jet.bTags() and similar methods, to exclude very soft, experimentally unavailable truth-tag particles.
  • The FastJets projection is now more compatible with FastJet’s own “pure ghosts”: these will be excluded from the reported Jet constituents, without interfering with Rivet’s own ghost approach to flavour tagging.
  • Cross-section and event counter are now written out by default – these should be very useful for run merging of multiparton generation with separate partonic multiplicity samples, cf. MadGraph and Alpgen. The Rivet scripts do not yet use these, so please get in touch if it sounds useful! You’ll need the latest YODA to read them correctly.
  • Since the latest versions of YODA fully support reading the 1D and 3D scatter data types, we’ve now templated the Analysis::refData() functions so you can book analysis objects other than 1D histograms and profiles based on the reference data.

As always, this new version is recommended for immediate use. Please keep sending us your feedback and analysis codes!