[clas12_rgk] Evgeny's puzzle

[Viktor Mokeev]

Dear All,

After discussion with Francois and simple analytical evaluation of the resolution over x_B, I cancel my proposal.

I agree with FX that we just observe the resolution over x_B for the elastic peak.

Only observation I have is: due to unknown reason, in the selected fake pi^+pi^-p events at W around 1.0 GeV we have  from substantial to dominant amount of true elastic electron scattering events and on top of them one additional hadron which should not belong to elastic event.

  Best Regards,
                        Victor
________________________________
From: Viktor Mokeev <mokeev at jlab.org>
Sent: Friday, October 25, 2019 7:26 PM
To: Francois-Xavier Girod-Gard <fxgirod at jlab.org>; clas12_rgk at jlab.org <clas12_rgk at jlab.org>; hybrid baryons <hybrid_baryons at jlab.org>
Subject: Re: [clas12_rgk] Evgeny's puzzle

Dear All,

 I propose to remove the events with x_B>1.

Best Regards,
                              Victor
________________________________
From: clas12_rgk <clas12_rgk-bounces at jlab.org> on behalf of Francois-Xavier Girod <fxgirod at jlab.org>
Sent: Friday, October 25, 2019 6:26 PM
To: clas12_rgk at jlab.org <clas12_rgk at jlab.org>; hybrid baryons <hybrid_baryons at jlab.org>
Subject: [clas12_rgk] Evgeny's puzzle

Dear all

I took a look at Evgeny's events and uploaded some information on the docDB
https://clas12-docdb.jlab.org/cgi-bin/DocDB/private/ShowDocument?docid=502

I was not able to produce CED pictures because the input DSTs from the trains do not have detector banks
However I think we can still see three kinds of events
(1) CVT "ghost" tracks around polar angle = 90 degrees (5% of events)
(2) CVT duplicate tracks correlated with the proton (22.5% of events)
(3) accidental tracks (72.5% of events)

Some samples of 1k events from each category are available under
/work/clas12/fxgirod/Evgeny/
In principle we can filter these events from decoded files, reconstruct them specifically and look at them on CED

Please let me know if you have questions of suggestions

Best regards
FX
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