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[Leszek Kosarzewski <leszek.kosarzewski AT gmail.com>]

Dear Colleagues Here are the work in progress codes for the dimuon photoproduction benchmark: https: //github. com/eic/detector_benchmarks/blob/0b2475c5c8fb42c88dc322a65102cb04a5ea4f01/benchmarks/nhcal_dimuon_fotoproduction/scripts/dimuon_fotoproduction_analysis. cxx#L456

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Dear Colleagues

Here are the work in progress codes for the dimuon photoproduction benchmark:

https://github.com/eic/detector_benchmarks/blob/0b2475c5c8fb42c88dc322a65102cb04a5ea4f01/benchmarks/nhcal_dimuon_fotoproduction/scripts/dimuon_fotoproduction_analysis.cxx#L456

With the current geometry we can make projections to nHCal (ID=113) and it's 2 projection surfaces (approximate positions):

surface=1 // the front surface at -395 cm

surface=2 // inner surface at -410 cm

There are local momentum vectors available. We are now working on selecting reconstructed hits in a certain distance from a straight line along the projection and momentum vector. In principle we can use other trajectory models or even ask Reco/Tracking group to add more surfaces for projections.

The full connection in the association chain was missing and we had to use Track id to make the full matching eg:

MCparticle -> ReconstructedParticle -> Track <--id--> Track <-- TrackSegment -> projection (TrackPoint at nHCal) 

However, it could be that the Track->TrackSegment association is available now.

We based it on Derek's macro:

https://github.com/eic/snippets/blob/main/Calorimetery/MatchClustersToTrackProjections/MatchProjectionsAndClusters.cxx

Best regards, Leszek