[G12] resolution of tagger in kinematic fitter

[Lei Guo]

That’s fine except the E_beam here should be the Energy of the photon, instead the constant (of the electron beam energy) that’s now used in the code. Did I get that wrong?

Lei

Lei Guo
Assistant Professor
Physics Department
Florida International University
Miami, FL

email: leguo at fiu.edu <mailto:leguo at fiu.edu> or lguo at jlab.org
Office:305-348-0234

> On Feb 10, 2016, at 12:39 PM, Carlos Salgado <salgado at jlab.org> wrote:
> 
> Hi
> 
> Follow the discussion in last g12 meeting.
> 
> The formula in the code for the variance of the photon bean energy is OK.
> 
> The uncertainty in the energy of the photon is 0.001* E_beam (per NIM and Eugene P.) The hodos were built such that this is true (different widths)
> 
> Then consider a counter of width (energy) "a"  where the (assume) energy distribution is flat: then Variance = sigma^2 = 1/a* int^a_0 E^2 dE = a^2/3
> 
> Therefore if we distribute the uncertainty over a counter (energy bin) the variance is : sigma^2 = (0.001*E_beam)**2/3
> 
> =Carlos
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