[Halld-offline] reorganization of tracking and pid code

[Kornicer, Mihajlo]

Hi Simon,

I am getting errors like
...
DCDCTrackHit_factory.cc:284 Ring or straw out of range! ring=3 (should
be 1-28)  straw=55 (should be 1-54)
...
for some single-photon events. I did fresh src/calib/hdds checkout,
revision 5902, and I use default geometry. Errors originate from calls to

        vector<const DTrackTimeBased*> chargedswum;
        eventLoop->Get(chargedswum);

inside DPhoton_factory. Can you please take a look at this, control
file is attached.

Thanks,
Mihajlo

Quoting Simon Taylor <staylor at jlab.org>:

> Hello, all.
>
> Based on the discussion we had at the most recent offline meeting, I
> have reorganized the tracking code in the following manner:  at the
> wire-based fitting stage, each track candidate is fitted multiple times
> based on a list of mass hypotheses.  All tracks that survive the fitting
> are
> put in the wire-based track list and serve as the input to the
> time-based tracking phase.    Each fitted track in the time-based phase
> is then matched to the outer detectors (TOF and BCAL) and the dEdx in
> the chambers is calculated.   A figure-of-merit using the chi2 of the
> fit, the dEdx, and the time-of-flight to the outer detectors is computed
> to indicate how good the particular mass hypothesis (passed on through
> the wire-based fits) is.  I have created a new factory in the PID
> library called DChargedTrack that is intended to be the charged-particle
> equivalent of DPhoton.   The DChargedTrack object contains a vector of
> fitted tracks.  There is one vector for each track candidate.  The lists
> are ordered according to the figure-of-merit from the DTrackTimeBased
> object.   The DParticle factory is now reserved for a higher level of
> the reconstruction chain and is currently an empty shell.
>
> Please let me know if you have any problems stemming from the
> reorganization.
>
> Simon
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