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[Charm] BW reduction of doubly charmed baryon lines Sep 2024

Ao Xu requested to merge charm-ccbaryon-hadronic-2024-patch into 2024-patches

Reduce BW of doubly charmed baryon lines with hadronic final states by:

  1. Add prescale of 10% for wrong-sign and doubly Cabbibo suppressed lines used for background study
  2. Add hlt1 filter, which has an efficiency above 90% (checked with early 2024 data)
  3. Switch off PersistReco for a few lines, keeping only 1 PersistReco line (Xicc++->LcKpipi)
  4. Reduce mass sideband of intermediate charmed hadron by 15%
  5. Tighten IPCHI2 cut to 1 for bachelors from Xicc+ decays, except for Xicc+->LcKpi
  6. Tighten IPCHI2 cut to 2 for bachelors from Xicc++ decays
  7. Tune IPCHI2 cut on daughters of intermediate charmed baryons according the lifetime order of tau(Xic0)<tau(Lc)<tau(Omegac)<tau(Xic+)

BW tested on real 2024 data with the snippet from @rjhunter, running on ccbaryon_hadronic and cbaryon_spectroscopy modules (considered to be independent of other modules) and over 130K events. BW reduced from 237 MB/s to 94 MB/s, by 143 MB/s or 60%.

Mitigate #840.

Edited by Ao Xu

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