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    • Type: Sub-task
    • Status: Closed (View Workflow)
    • Priority: Medium
    • Resolution: Completed
    • Affects Version/s: 6.18/02
    • Fix Version/s: 6.20/00
    • Component/s: RooFit/RooStats
    • Labels:
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      Description

      The Hypatia PDF is generalization of the crystal ball PDF and it is used for modelling mass resonances like the Jpsi and the B0 mass and is used by multiple LHCb working groups: https://arxiv.org/pdf/1312.5000.pdf

      Most often this implementation is used which contains a lot of commented-out code:

      https://gitlab.cern.ch/lhcb/Urania/blob/master/PhysFit/P2VV/P2VV/RooIpatia2.h

      https://gitlab.cern.ch/lhcb/Urania/blob/master/PhysFit/P2VV/src/RooIpatia2.cxx

      This is the double tailed version, in the paper only the single-tailed version is really mentioned, but both can be useful. Since this is such a crucial function, it would be great to have a standardized version in RooFit.

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              • Assignee:
                shageboe Stephan Hageboeck
                Reporter:
                vjevtic Vukan Jevtic
              • Votes:
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