[Frost] Phi lab correction

[Eugene Pasyuk]

Hi Priya,

This looks nice. Now we need to check if this phi correction has any effect on other things.

Mike, Natalie:
 
Could you revisit your study of target angle offset with Priya's phi correction to see if it make difference.

-Eugene

----- Original Message -----
> From: "Priyashree Roy" <pr10c at my.fsu.edu>
> To: frost at jlab.org
> Sent: Tuesday, July 16, 2013 10:06:59 AM
> Subject: [Frost] Phi lab correction
> 
> Dear all,
> 
> As we have seen in our recent frost meetings, the lambda pulls had a
> sine dependence on phi lab. I have attempted to correct phi lab
> using a sine function correction and then I recalculated
> four-momentum of the particles. The new four-vectors were used as
> inputs for kinematic fitting and the pulls were extracted. The pulls
> looked much better. I think changing the amplitude of the sine
> function by a little amount (0.7percent correction instead 0.5
> percent) should eliminate phi dependence of lambda pulls completely.
> The correction does not alter magnitude of momentum and theta lab
> and the overall pull and CL distributions look good.
> 
> Here are the details of the correction :
> http://www.jlab.org/Hall-B/secure/g9/priyaroy/Phi_lab_correction.pdf
> 
> Regards,
> Priyashree
> 
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