[Hps-analysis] test pass 7d

Nelson, Timothy Knight tknelson at slac.stanford.edu
Fri Nov 17 17:51:35 EST 2017


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. <ngraf at slac.stanford.edu> 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://urldefense.proofpoint.com/v2/url?u=https-3A__heavyphotonsearch.slack.com_messages_C5FCT7161_&d=DwIGaQ&c=lz9TcOasaINaaC3U7FbMev2lsutwpI4--09aP8Lu18s&r=J4PP6Zl8IyGHpsqWaKegORCYw8hoCHePTw5O95a5lqQ&m=s52aaeaZrWgt4QyVnpl3DVclc03dztWpSwlO9Vvf4A0&s=IHfifZtXt36gCrc-WZZ1-JVSqynWs_ivKzZ-S6KdgSc&e=  . 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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