[Halld-tagger] [EXTERNAL] Fwd: your simulation samples are now ready

[Richard Jones]

Andrew,

I have generated new muon-pair Bethe Heitler MC samples using my BH
generator. The output is saved in the following directory.

/volatile/halld/jonesrt/BHgen-11-2021/BHgen_sXrY.hddm    # X =
3,4,5,11,12,13,14,15 and Y=10,100,1k,10k

Files are labeled based on a couple of different distinctions. There are 10
billion beam photons per model, originally produced in 10000 runs with
event numbers 1...1000000 in each. Event numbers 1...500000 are for PERP
(90 degree) and 500001...1000000 are generated in the PARA (0 degree)
orientation, both with 100% linear beam polarization. Only about 1/4 of the
beam photons make it through the collimator to the GlueX target, but the
ones that do make it convert at a random spot along the target with 100%
efficiency. I only transferred the sets with common cuts applied that we
agreed you want, see below. If you find files spaced out every 100 in
sequence number, it's because I merged them in sets of 100 already.

   1. s3 = the standard BH model : liquid hydrogen target, 12 GeV endpoint,
   tagged range 8-9 GeV.
      - 4 accept/reject reduction sets: s3r10, s3r100, s3r1k, s3r10k
      F1_timelike = 1;
      F2_timelike = 0;
      F1_spacelike = nucleonFormFactor(-t, kF1p);
      F2_spacelike = nucleonFormFactor(-t, kF2p);
      2. s11 = same as s3 except different form factor choice
      - F1_timelike = 0;
      - F2_timelike = 0;
      - F1_spacelike = nucleonFormFactor(-t, kF1p);
      - F2_spacelike = nucleonFormFactor(-t, kF2p);
   3. s12 = same as s3 except different form factor choice
      - F1_timelike = 0;
      - F2_timelike = 0;
      - F1_spacelike = nucleonFormFactor(-t, kF1p);
      - F2_spacelike = 0;
      4. s13 = same as s3 except different form factor choice
      - F1_timelike = 1;
      - F2_timelike = 1;
      - F1_spacelike = 0;
      - F2_spacelike = 0;
      5. s14 = same as s3 except different form factor choice
      - F1_timelike = 1;
      - F2_timelike = 0;
      - F1_spacelike = 0;
      - F2_spacelike = 0;
      6. s15 = same as s3 except different form factor choice
      - F1_timelike = 0;
      - F2_timelike = 1;
      - F1_spacelike = 0;
      - F2_spacelike = 0;
   7. s4 = 280Pb target with CPP geoemtry (cpp_main.xml), 12 GeV endpoint
   energy, 8-9 GeV tagged
      - includes coherent scattering from 208Pb atom, with atomic screening
      - includes quasi-elastic scattering from protons in 208Pb, standard
      proton form factors
      - includes qausi-elastic scattering from neutrons in 208Pb, standard
      neutron form factors
   8. s5 = 280Pb target with CPP geoemtry (cpp_main.xml), 12 GeV endpoint
   energy, 5-6 GeV tagged
      - same BH physics as s4, jsut different energy

The primary role of the geometry in the generator is just to select the
target material (hydrogen or lead). The position of the vertex in the
generated files also follows the position of the target in the geometry,
but you can override that if you want using the control.in cards of
hdgeant/4.

-Richard Jones
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