[Gep5] SLAC energy resolution

[Charles Fl Perdrisat]

Hi all, from Milan. Great result for energy resolution. What is the 
uncertainty on both constants. See you on Tuesday/ Charles

On Thu, 1 Aug 2013, Carlos Ayerbe-Gayoso wrote:

> Hello everybody
>
> Matthew has finished his analysis of the energy resolution from the SLAC 
> test. Following the suggestion from Mark due to the linearity of the energy 
> calibration for two, three electron in the 3GeV setup, he added those points 
> obtaining the attached result.
>
> Besides, he neglected the use of the 9GeV setup since the spectrum is not so 
> clean as the other setups. Also, he rejected the 24 GeV and 36 GeV peaks from 
> the 12 GeV set up.
>
> Perhaps the 24 GeV should not be rejected (it should be discussed comparing 
> how far of linearity is such calibration), but the 36 GeV is clear to be 
> rejected since its position was very close to the limit of the ADC range 
> causing some overflow problems.
>
> I suggested him to make the fit only with the stochastic A/sqrt(E) and 
> calibration tems C, since Avoni paper only presents those two terms.  Avoni 
> paper presents 10.8%/sqrt(E) and 1.4%.
>
> As you can see, Matthew achieve 11.2%/sqrt(E) but a negligible C term.
>
> I think it is a very good result, and more or less confirm that the outer 
> modules are in quite good state.
>
> Thank you very much
>
> Greets
>
> Carlos
>