[Hps-analysis] vertex x position

[Graf, Norman A.]

?Agreed. I think for questions such as this, we need to analyze UNnconstraind vertices.


Norman


________________________________
From: Hps-analysis <hps-analysis-bounces at jlab.org> on behalf of Graham, Mathew Thomas <mgraham at slac.stanford.edu>
Sent: Wednesday, August 2, 2017 10:58 AM
To: Omar Moreno
Cc: hps-analysis at jlab.org
Subject: Re: [Hps-analysis] vertex x position


If this is still target constrained then this will skew the mean by quite a bit...

On Aug 2, 2017, at 11:56 AM, Omar Moreno <email at omarmoreno.net<mailto:email at omarmoreno.net>> wrote:

I'm seeing a much smaller shift (~-13 um)  (see attached).  I wonder how much you would need to move the target to get the 127 um shift we see in data? Just curious ...

On Wed, Aug 2, 2017 at 9:54 AM, Rafayel Paremuzyan <rafopar at jlab.org<mailto:rafopar at jlab.org>> wrote:
This is the most recent scan with svt_top from 2015 data
https://logbooks.jlab.org/entry/3340385

It shows beam_x position is -0.127mm

So might be it is normal than Omar sees X slightly negative.

Rafo
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