[Clas12_verystrange] Xi1820 efficiency

[Johann Goetz]

OK, here it is. sorry for the delay in getting this out.

I generated 300k of the following reaction:

g p --> Xi-(1820) K+ K+
  Xi-(1820) --> Lambda K-
    Lambda --> p pi-

The Xi-(1820) was generated via a massive and broad Y* state with a t-slope
of about 1.9 (consistent with g11/g12 results for t-slope of Xi-(1530)).
The generator was the Pluto (root-based) library and the efficiency
calculator was the fastmc in Mike's home directory.

detected particles / % acceptance
K+ K+ K- p / 4.66 %
K+ K+ K- pi- / 0.30 %
K+ K+ K- / 18.73 %

--
Johann.
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