[Hps-analysis] Rad frac updated

[Graham, Mathew Thomas]

Thanks for this Bradley, Good to have official numbers!

For events/file, that is basically what I’m using (*10 because I use DSTs)…I’ll switch to 590 from (600); that’s <2% though for me.

On Feb 16, 2017, at 8:57 AM, Bradley T Yale <btu29 at wildcats.unh.edu<mailto:btu29 at wildcats.unh.edu>> wrote:

I averaged over a lot of WAB files (>10k) and got more accurate numbers for wabv3SF.
The cross section page was updated.

The cross section is actually closer to 590.207 mb, and 11518 generated events/file.
The procedure overshoots on average when trying to generate enough events.

However, the cross section is still not as stable as it is for the tridents, and doesn't improve with a >0.5 GeV sum cut (like it did for the tridents). I'm looking into other wab cuts that may fix it. Both types of tridents have exactly 10k events, and very stable cross sections though.

In the meantime, these new numbers provide a >10% difference in the WAB normalization, and should be used instead of 600/10k.

Bradley

________________________________
From: Hps-analysis <hps-analysis-bounces at jlab.org<mailto:hps-analysis-bounces at jlab.org>> on behalf of Holly Vance <hvanc001 at odu.edu<mailto:hvanc001 at odu.edu>>
Sent: Thursday, February 16, 2017 11:22:39 AM
To: hps-analysis at jlab.org<mailto:hps-analysis at jlab.org>
Subject: [Hps-analysis] Rad frac updated

Hi all,

This past week I showed the rad frac at 12% with vertex cuts. I had not accounted for alpha difference in radiatives (I thought these were generated with correct alpha, but it seems they are not).

In any case, I now calculate rad frac to be 9% which seems consistent with Omar and Matt S.

-Holly
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