[Halld-offline] hits missing after pass thru evio encoding/decoding

Richard Jones richard.t.jones at uconn.edu
Wed Aug 27 12:45:44 EDT 2014

Hello all,

I am working on validating the sim-recon-rj-pm branch before we check it
into the trunk, and one of the things I am doing is making sure that the
tagger hits that are now being decoded from the evio fADC/TDC structs are
properly showing up as dana objects in the analysis. To do this, I am
running simulation output files through the hddm -> evio converter and then
reading the events back into dana from evio input files. The problem is
that I am seeing lots of missing hits that get dropped during this
coding/decoding process, and I wonder if this is correct. BTW, I also see
it for trunk code, although the output from hdgeant is different between
the two branches so I cannot do event-by-event comparisons.  Here is what I

   - BCAL - same number of hits (DBCALHit objects), but major decrease in
   the number of clusters (DBCALShower, DBCALCluster) that are made out of
   them. Is something being incorrectly transmitted through the filter?
   - FCAL - things all look consistent here
   - CDC - same number of hits before and after
   - FDC - 10% loss of hits (DFDCHit objects) , but major decrease in
   higher level objects like DFDCPseudo, DFDCIntersection which have 90% loss.
   - StartCounter - same number of hits before and after
   - FTOF - some hits are missing, but the higher-level objects
   (DTOFPaddleHit, DTOFPoint) seem consistent, maybe just a threshold cut?
   - Track objects - there may be a correlation between the pre-filter and
   post-filter statistics on these objects, but it is not obvious. The counts
   are rarely consistent between them for any of the track objects.
   - Neutrals objects - ditto.

Is there someone who is taking the lead in studying the behavior of this
filter? Should I ignore these differences, and consider the to/from evio
capability of our offline to be unready for actual use?

-Richard J.
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