[b1_ana] Rates Update

[O. A. Rondon]

Hi,

PAC day = 2 calendar days.

About the bins and errors, I would like to repeat my previous comments.
We need to define x bins for each setting. We can definitely combine
data of different Q^2 into the same x bin (from two spectrometer
settings,) but we shouldn't integrate over anything wider than ~ 0.2 in
x for the same setting.

Take a look at the HERMES Q^2 vs x plot: the bins at x = 0.09 and x =
0.18 are 0.09 and 0.18 wide. But for the proposal we have been talking
about 0.2 wide, and now the bin width is being taken as the full
spectrometer acceptance in x. The only bin that should include all the
way to x = 1 is the highest one, but it still needs a low x edge.

Cheers,

Oscar

Elena Long wrote:
> Good afternoon,
> 
> Patricia and I have been working on the rates, and I think we've come to
> an agreement. There's a difference from last night, which stems from the
> fact that I was using old (larger) values for the spectrometer energy
> acceptance on the SHMS. They've been updated to what the SHMS can
> actually do, and new plots can be found at the link below.
> 
> I've also moved the <x> bins for b1 and Azz to reflect the central range
> that they are measuring over. The dark points on the kinematics plots
> show the central value of where we would park the spectrometer.
> 
> One thing that I'm currently unclear on is whether a PAC day consists of
> 24 hours (100% efficiency) or 12 hours (50% efficiency). I've plotted
> both cases given 30 days (9 days at x=0.15 and 0.3, 10 days at x=0.35,
> and 30 days at x=0.45).
> 
> https://hallcweb.jlab.org/wiki/index.php/Elong-13-05-02
> 
> Now that the code has been cross-checked, this afternoon I'm going to
> scan over x and Q2 again to see if I can find a "sweet spot" for any of
> the points. Also in the plans is re-coloring the kinematics plots so
> that each data period is easy to see.
> 
> Take care,
> Ellie
> 
> 
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