[G12] Beam Correction II

[mpaolone at jlab.org]

Hey everyone,

It looks like a lot of work has been done since our last meeting on Friday
afternoon.  I propose a g-12 Beam Correction meeting early this week to
discuss the results, address questions, and coordinate efforts between
everyone involved.  For this meeting, we only need the main beam
correction people to attend (Mukesh, Craig, MK, Johann), but anyone who is
interested is encouraged to join us also.

So how does Tuesday afternoon sound?  Say at 2pm?

-Michael


> 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>_______________________________________________
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> --
> 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
>
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> --
> 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
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