[G12] Beam Correction II

[Michael C. Kunkel]

On 11/7/11 8:24 AM, Hicks, Kenneth wrote:
>
> Looked at another way, the correction factor changed from 0.584% to 
> 0.509%, a change of 584/509=1.15. Can you
>
> do better to get a more accurate correction with less uncertainty?
>
> *From:* g12-bounces at jlab.org [mailto:g12-bounces at jlab.org] *On Behalf 
> Of *Johann Goetz
> *Sent:* Monday, November 07, 2011 8:20 AM
> *To:* Michael C. Kunkel
> *Cc:* g12
> *Subject:* Re: [G12] Beam Correction II
>
> seems like the error in your result (the 1.00584) is maybe 0.001 or 
> so. Is that reasonable?
>
> On Sun, Nov 6, 2011 at 5:47 PM, Michael C. Kunkel <mkunkel at jlab.org 
> <mailto:mkunkel at jlab.org>> wrote:
>
> On 11/6/11 6:32 AM, Dennis Weygand wrote:
>
> What exactly does 'manually' mean?
>
> On Nov 4, 2011, at 8:53 PM, Michael C. Kunkel wrote:
>
>
>
> Greetings G12'rs
>
> I have realized if I do a manual fit to find the correction value, I 
> can obtain different correction values for the beam.
>
> My previous email had a correction factor of 1.00509. When I do it 
> manually I get a correction factor of 1.00584.
>
> I have attached the new plot for run 56515. There is now only a 2.78 
> MeV difference in the mass peak from the expect.
>
> I know believe this is the correct path to undertake for the beam 
> corrections.
>
> BR
> MK
>
> <corrected_plotII.jpg>_______________________________________________
> G12 mailing list
> G12 at jlab.org <mailto:G12 at jlab.org>
> https://mailman.jlab.org/mailman/listinfo/g12
>
> --
>
> Dennis Weygand
>
> weygand at jlab.org <mailto:weygand at jlab.org>
>
> (757) 269-5926 <tel:%28757%29%20269-5926> (office)
>
> (757) 870-4844 <tel:%28757%29%20870-4844> (cell)
>
> It means, instead of having ROOT do a TF1 fit with initial parameters 
> and allowed variances, I open the histogram, right click the 
> histogram, open fit panel, manually set my limits ..etc.....ie manually
>
>
> BR
> MK
>
>
> _______________________________________________
> G12 mailing list
> G12 at jlab.org <mailto:G12 at jlab.org>
> https://mailman.jlab.org/mailman/listinfo/g12
>
>
>
>
> -- 
> Johann T. Goetz, PhD. <http://sites.google.com/site/theodoregoetz/>
> jgoetz at ucla.edu <mailto:jgoetz at ucla.edu>
> Nefkens Group, UCLA Dept. of Physics & Astronomy
> Hall-B, Jefferson Lab, Newport News, VA
> Office: 757-269-5465 (CEBAF Center F-335)
> Mobile: 757-768-9999
>
Hi Ken,

I'm not sure what you mean by "can I do better". I have recently done a 
better job of my fitting procedure, once I learned of a ROOT fitting 
caveat, but this still leaves my proton mass low. I will be presenting 
it tomorrow, but if you have suggestions before that, I am always open 
to that.

BR
MK
-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://mailman.jlab.org/pipermail/g12/attachments/20111107/9417e61d/attachment.html