[Halld-tagger] [EXTERNAL] generated BH pair samples

[Richard Jones]

Hello Andrew,

I generated a couple of large BetheHeitler samples for you to look at, each
with a specific set of features.

   1. BHgen -- 10G events with weights corresponding to cross section, such
   that the average weight over any subset of the events is the corresponding
   partial cross section (ub) for the final states corresponding to these
   cuts. If you want an unweighted sample, you need to run an accept/reject
   pass over these events.
      - pairs vertex generator: Dirac++ library, all diagrams at tree level
      - output format: hddm_s
      - number of events per file: ~240k, event numbers 1...1M, beam
      photons that are lost on the collimator are suppressed.
      - polarization mixed: eventNo=1..500,000 : 90 degrees (perp, 100%
      linear), eventNo=500,001..1,000,000 : 0 (para, 100% linear)
      - hddm output data files url:
      https://urldefense.proofpoint.com/v2/url?u=https-3A__grinch.phys.uconn.edu-3A2880_Gluex_simulation_BHgen-2D6-2D2021_BHgen-5FNNNNN.hddm&d=DwIBaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=-MwMW0sKroUIjy-Lh9rb3KzmWIgdcbbr9_jez8RLmto&m=3X8agioPC5cl5ZA5NahzK8SCryL0VnlJIRuwDTY1p18&s=R34HhdyCzpQxC1QdQeVJB5L2NaomzdX84NZNz-hidoU&e= ,
      where NNNNN=10000..19999.
      - root trees output data files url: root://
      nod27.phys.uconn.edu/Gluex/simulation/BHgen-6-2021/BHgen_X.root,
      where X=10000, 10100, 10200, 10300, ... 19900, each contains events from
      100 output files BHgen_NNNNN.hddm captured in a root tree.
   2. Bernard -- 10G events unweighted, all events have weight=1 assigned
   in the output file.
      - pairs vertex generator: cern G4 library (G4BetheHeitler5DModel
      class, based on work by Bernard, uses polarization formula from Berlin
      paper).
      - output format: hddm_s
      - number of events per file: ~240k, event numbers 1...1M, beam
      photons that are lost on the collimator are suppressed.
      - polarization mixed: eventNo=1..500,000 : 90 degrees (perp, 100%
      linear), eventNo=500,001..1,000,000 : 0 (para, 100% linear)
      - hddm output data files url:
      https://urldefense.proofpoint.com/v2/url?u=https-3A__grinch.phys.uconn.edu-3A2880_Gluex_simulation_Bernard-2D6-2D2021_BHgen-5FNNNNN.hddm&d=DwIBaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=-MwMW0sKroUIjy-Lh9rb3KzmWIgdcbbr9_jez8RLmto&m=3X8agioPC5cl5ZA5NahzK8SCryL0VnlJIRuwDTY1p18&s=iHge1dgTQoUNlsQlLBdfjaoAJ9JkBu7KN3xQIbngIl0&e= ,
      where NNNNN=10000..19999.
      - root trees output data files url: root://
      nod27.phys.uconn.edu/Gluex/simulation/Bernard-6-2021/BHgen_X.root,
      where X=10000, 10100, 10200, 10300, ... 19900, each contains events from
      100 output files BHgen_NNNNN.hddm captured in a root tree.

-Richard Jones
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