[Frost] About Normalization

[Michael Dugger]

Sung,

It might be easiest to use a relative normalization. You can count the 
number of events per energy bin in the CH2 target and assume that the 
incident photon flux scales with the number of CH2 events. This should 
give you a very good relative normalization for circular beam data. For 
linear beam, you need to account for the phi asymmetry, but that is not 
difficult to do.

-Michael

On Wed, 25 May 2011, Sungkyun Park wrote:

> Hi Eugene and Steffen,
>
> Now I try to get the asymmetry plot for observable I^{circle} in FROST data to compare it with the data published by Steffen.
> For this, I need to make the unpolarized target data from the FROST data.
> I know each run has the target polarization with the same direction but their values are different.
> To make unpolarized target data, I will divide each target polarization value.
> Before doing that, I need to consider the normalization because each run has different number of events.
>
> I make three picture in the following.
>  http://hadron.physics.fsu.edu/~skpark/research/research_may2511.html
> I will call picture-1 on the top left, picture-2 on the top right, and picture-3 on the bottom-left.
> I made these using gflux056200_erg2.aXX.dat in our gflux.
>
> Q1) what do I use as the normalization factor in each photon energy bins?
>
> picture-1 is about number of photons in each photon energy bin.
> picture-2 is about (number of photons)X(photon energy) in each photon energy bin.
>
> it I am on the wrong way, I really want to know how I get the normalization factor from gflux file.
>
> Sung
> Florida State University
>
>
>
>
> Florida State University
>