Hello,
I am trying to read some "final"/reconstructed LCIO or ROOT files in
order to understand how to proceed with my task. For the beginning I
took few files mentioned at:
https://confluence.slac.stanford.edu/display/hpsg/Finding+Monte+Carlo+data+at+SLAC
e.g. this one:
ap2.2gev075mev_001_SLIC-v2r11p1_geant4-v9r3p2_QGSP_BERT_HPS-Proposal2014-v3-2pt2_readout_recon.slcio
(the corresponding ROOT files do not load with the last LCIO library
saying: "The StreamerInfo of class HpsEvent read from file has the same
version (=1) as the active class but a different checksum. You should
update the version to ClassDef(HpsEvent,2). Do not try to write objects
with the current class definition, the files will not be readable.")
I converted the working file into ROOT DST by means of the "dst_maker".
By the way most of the other files available on that page, e.g.:
ap075mev_egs_tri_2.2gev_0.00125x0_200na_5e5b_30mr_001_SLIC-v2r11p1_geant4-v9r3p2_QGSP_BERT_HPS-Proposal2014-v3-2pt2_readout_recon.slcio
egs_tri_2.2gev_0.00125x0_200na_5e5b_30mr_001_SLIC-v2r11p1_geant4-v9r3p2_QGSP_BERT_HPS-Proposal2014-v3-2pt2_readout_recon.slcio
do not convert, causing a segmentation fault of "dst_maker".
Now, I tried to look into the obtained ROOT file, there are some tracks
and EC hits, but there are no "_particles" (except for, I guess, input
mc_particles).
Am I missing something or using obsolete "examples" of MC data? Or the
construction of reconstructed particles does not work yet?
Another question, on the page:
https://confluence.slac.stanford.edu/display/hpsg/HPS+Data+Summary+Tapes
you provided a list of DST variables, however if one could spend a few
minutes explaining what are for example:
tracks: d0, phi, omega, tan_lambda, z0,
svt_hits: covariance matrix cxy,czz...,
mc_particles: endpoint,
gbl_tracks: kappa, theta, phi, d0, z0, seed_kappa, seed_theta, seed_phi,
seed_d0, seed_z0, chi^2, ndf, momentum, covariance
it would be much more helpful.
Best Regards,
Mikhail.
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