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Good question Tim. I'll take a look at the Møller MC and see if that sheds any light on this.





From: Nelson, Timothy Knight
Sent: Friday, November 17, 2017 2:51 PM
To: Graf, Norman A.
Cc: Rafayel Paremuzyan; [log in to unmask]; hps-software
Subject: Re: [Hps-analysis] test pass 7d
 
Hi Norman,

Thanks for being really on top of this. 

It’s not a question for today, but on the momenta: do we really even know that we expect the x and y momenta to be centered on zero given ECal acceptance and alignment effects? This has been on my mind a fair bit w.r.t. trying to pin down large scale SVT alignments.

Cheers,
Tim

> On Nov 17, 2017, at 2:17 PM, Graf, Norman A. <[log in to unmask]> wrote:
>
> Dear Colleagues,
> I've posted the results of my first, quick analysis of the tpass7d output to the #project-2015pass7 channel on Slack: https://heavyphotonsearch.slack.com/messages/C5FCT7161/ . So far I have only analyzed the Møller skim from run 5772.
> Preliminary conclusions are:
>
> Unconstrained vertex position reconstruction consistent with beamspot centered at (0,0) and a target at z=0.5mm.
>
> Unconstrained vertex momenta show only very small deviations of beam from z axis.
>
> Uniformity of mass calculated from the three vertex collections (Unconstrained, BeamspotConstrained and TargetConstrained) confirms the internal consistency of locating the target at z=0.5mm.
>
> TargetConstrained Møller mass (from a simple Gaussian fit) is
>
> m=0.033276±0.000003
>
> TargetConstrained Møller mass resolution (from a simple Gaussian fit) is
>
> sigma=1.4633E-3 ± 3.0E-6
>
> So far, so good.
>
> Norman
>
>
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