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Problems with B -> 4 mu and gamma mu mu EvtGen models
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Description

There are some problems with the B to 4 mu and gamma mu mu decay models, which were originally from the EvtGenExtras package in LHCb:

  1. The lepton spin loop iterators for the B0 modes in EvtbsToLLLLAmp and EvtbsToLLLHyperCPAmp need correcting to avoid zero amplitudes. See https://gitlab.cern.ch/evtgen/evtgen/-/commit/6838e2c7
  1. The BQTOLLLLHYPERCP model regularly returns very high probability values, which constantly fail accept/reject.
  1. The BSTOGLLISRFSR model is also regularly failing accept/reject.

Event Timeline

jback triaged this task as Normal priority.Sep 11 2021, 3:46 PM
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