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MarlinKinfit

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Kinematic fitting library for MarlinKinfit. Does not include the Processors, which have been moved to MarlinKinfitKinfitProcessors.

MarlinKinfit is distributed under the GPLv3 License

License

License and Copyright

Copyright (C), MarlinKinfit Authors

MarlinKinfit is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License long with this program. If not, see http://www.gnu.org/licenses/.

Kinematic fitting library for Marlin.

Currently two examples are available:

  • WW5CFit: This processor performs a 5C fit (px, py, pz, E and equal mass constraints) on 4 jet events, as one would do for WW or ZZ events. The center of mass energy and the name of the input jet collection are steerable.

    The provided example steering assumes that you have a standard DBD ILD_o1_v5 DST file at 500 GeV. It runs the FastJetProcessor in exclusive kt mode to remove the gammagamma->hadrons overlay and then performs the fit on the remaining jets.

  • TTBarExample: This processor performs a 6C fit (px, py, pz, E and 2 W mass constraints) on 6 jet events, as one could do for ttbar events. To reduce the combinatorics it is assumed that 2 jets are b-tagged. The center of mass energy and the name of the input jet collections are steerable.

    The provided example steering assumes that you have an LCIO file which already contains two collections of 4 light jets and 2 b-jets per event. If you don't have such a file, you have to call digitization, particle flow, jet finder and b-tagging before calling TTBarExample.

In addition, TopTester provides an example how to use TopEventILC, a toy MC of either fully hadronic or semi-leptonic ttbar events plus a matching kinematic fit. In the toy MC, the generated four-vectors of the 6 final-state fermions are smeared with the same resolutions as used in the fit, and the correct jet pairing is cheated. This comes handy for testing further developments of the fit engines, or of new types of fit objects, contraints etc.

Further information about the fit engine and the user interface provided in MarlinKinfit can be found at https://www.desy.de/~blist/kinfit/doc/html/

and in the LCNotes LC-TOOL-2009-001 and LC-TOOL-2009-004 available from http://www-flc.desy.de/lcnotes/

26.11.2014 Jenny List