[Halld-pid-upgrade] [Revised Logentry] DIRC Hit Pattern data/MC comparison

[Shepherd, Matthew]

Beautiful!  Congratulations on achieving this very nice milestone!


> On Feb 11, 2019, at 10:50 AM, jrsteven at jlab.org wrote:
> 
> DIRC Hit Pattern data/MC comparison
> 
> 	• Edit
> 	• Delete
> Lognumber 3650993. Submitted by jrsteven on Mon, 02/11/2019 - 08:40. 
> Last updated on Mon, 02/11/2019 - 10:45
> Logbooks:	HDDIRC
> Attached Files:	
> <application-pdf.png>Data pixel maps for direct photons (each page is a bar and canvas is an 5 cm step in x)
> <application-pdf.png>bggen MC pixel maps for direct photons (each page is a bar and canvas is an 5 cm step in x)
> <application-pdf.png>Data pixel maps for reflected photons (each page is a bar and canvas is an 5 cm step in x)
> <application-pdf.png>bggen MC pixel maps for reflected photons (each page is a bar and canvas is an 5 cm step in x)
> To compare the PMT hit patterns between data/MC, we selected pi+ from rho events in both data (runs 60590-60617) and bggen MC. The requirements for the track are that it enters bar #3 (4th from the beamline) at a position 0 < x < 5 cm, and the track momentum > 4 GeV (to have a constant cherenkov angle). This small area allows us to see a unique hit pattern on the PMT plane seen below. The first image is for photons which travel directly to the optical box with data (top) and MC (bottom):
> 
> 
> 
> The plot below shows photons reflected by the far end of the bars again with data (top) and MC (bottom). These are separated by a time cut:
> 
> 
> 
> Bottom line: we see clear Cherenkov photon patterns! More investigation is needed to understand the details and study the photon yield per track.
> 
> In the attachments you'll find PDF files which have a page for each of the bars and canvases for different x regions of the bar. Separate files are there for data and bggen MC for comparison.
> 
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