[Hps-analysis] followup on track pulls

[Jaros, John A.]

Matt, 
Since there is more or less independence from track momentum, can we just scale the appropriate tracking errors to get unit width pulls?
John

-----Original Message-----
From: Hps-analysis [mailto:hps-analysis-bounces at jlab.org] On Behalf Of Graham, Mathew Thomas
Sent: Wednesday, September 27, 2017 9:26 AM
To: Nelson, Timothy Knight
Cc: hps-analysis at jlab.org
Subject: Re: [Hps-analysis] followup on track pulls


Here’s the second plot (which is z0 by the way) expanded to +/-10…here it’s easier to see that the red (p>0.55GeV) is marginally narrower than the mid (blue) and p<0.4GeV (black), but there’s no smoking gun here.   




	On Sep 27, 2017, at 9:43 AM, Graham, Mathew Thomas <mgraham at slac.stanford.edu> wrote:

	Here are the projections in low, mid, high bins of momentum (normalized to integral=1) for slope and z0.  No labels on the plots because it doesn’t matter,  widths are basically the same.  
	<PastedGraphic-1.png> 

	<PastedGraphic-2.png>
	



		On Sep 27, 2017, at 8:34 AM, Nelson, Timothy Knight <tknelson at slac.stanford.edu> wrote:
		
		Hey Matt,
		
		I’m not so sure there is *nothing* to see there.  The width is certainly correlated with Pz in the s-z view (impossible to quantify by eye - sliced fits or just a profile would flesh this out) and there are trends in the tails of the r-phi view (looks interesting but not too serious).
		
		T
		
		

			On Sep 27, 2017, at 7:00 AM, Graham, Mathew Thomas <mgraham at slac.stanford.edu> wrote:
			
			<electron-all-trkpar-vs-Pz-newcalc-pull.pdf>
			



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