[Hps-analysis] SVT ECal relative alignment

[Graf, Norman A.]

Hello Stepan,
 Yes, the residuals are cluster - track.
Norman

-----Original Message-----
From: Stepan Stepanyan [mailto:stepanya at jlab.org] 
Sent: Wednesday, July 29, 2015 11:38 AM
To: Graf, Norman A.; hps-software; hps-analysis at jlab.org
Subject: Re: SVT ECal relative alignment

Norman,

On X-axis, is it really cluster_position-track_postion?

Stepan

On 7/29/15 1:13 PM, Graf, Norman A. wrote:
> Hello All,
>   I've taken the straight tracks from the field-off run 5784 and 
> projected them to the Ecal. The residuals are plotted in the 
> attachment using the z position of the cluster (which was essentially 
> constant at 1393.7). Although the accuracy is quite good (~2.5 to ~3 
> mm) there are clear systematic shifts in both x and y for both top and 
> bottom. Do these patterns make sense to anyone? I've also attached the 
> cluster x-y positions, showing the fiducial cuts imposed on the clusters.
>
> I should note that these events were reconstructed using a 
> non-production steering file. The calorimeter positions were taken 
> from the uncorrected cluster collections pointed to by the 
> ReconstructedParticle objects. The reconstruction did use the
>
> HPS-EngRun2015-Nominal-v2
>
> detector which has the SVT survey incorporated. Have the ECal survey 
> numbers been incorporated into this detector? If not, are these shifts 
> commensurate with any of the measured offsets?
> Thanks,
> Norman
>
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