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

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