[G8b_run] Good News: Tagger Sag and Momentum Corrections

[Ken Livingston]

Hi Volker,
Deep joy! Talk to you tomorrow.

Cheers,
Ken


Volker Crede wrote:
> Hi all,
>
> very good news: we have finally obtained very reasonable results from 
> the kinematic fitter. The updated pictures in the attachment are 
> similar to those Charles sent out on Monday. The typical tagger sag 
> plot (on page 1) shows a flat energy dependence after applying Mike's 
> energy correction. Also, the pulls look good and the large 
> displacements have disappeared.
>
> We have been quite wrong earlier this week; we entirely underestimated 
> the effects of an energy-dependent energy correction and many thanks 
> to Mike for asking us to apply his polynomial. Most of the issues Ken 
> raised in yesterday's email receive now satisfying answers. The pulls 
> look quite reasonable now and compare very well with Mike Williams 
> results for the g10 data (see table on page 3). It looks like we have 
> the systematics of the g8b data under control. The justification now 
> for not applying pion momentum corrections is that we don't observe 
> problems with the measured momenta.
>
> Best wishes and talk to you tomorrow in the meeting
>
>    Volker & Chuck
>
> ----------------------------------
>
> Volker Crede
> Assistant Professor
> Florida State University
> Department of Physics
> 206 Keen Building
> Tallahassee, FL  32306  USA
>
> Phone: 001 850 644-2423
> Fax: 001 850 644-4478
> crede at fsu.edu
> ------------------------------------------------------------------------
>
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-- 
=======================================================
Ken Livingston          

Dept. of Physics & Astronomy,        Tel: +44 141 330 6428
University of Glasgow,               Fax: +44 141 330 5889
Glasgow G12 8QQ.
Scotland. UK.
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