[b1_ana] Rates Update

[Elena Long]

I will add the x binning, however I do want to point out that it won't 
be a trivial task. There are a few trivial things I'm working on first, 
since I can get them out of the way relatively quickly, before getting 
to the x binning.

One thing I do want to mention is that none of the bins accept an x 
range up to one. The maximum x within the physics rate ~0.64.

As it stands currently, the x ranges are:
xmin < xcentral < xmax

0.09 < 0.18 < 0.35
0.18 < 0.29 < 0.45
0.27 < 0.36 < 0.49
0.34 < 0.44 < 0.58


Take care,
Ellie

Elena Long, Ph.D.
Post Doctoral Research Associate
University of New Hampshire
elena.long at unh.edu
ellie at jlab.org
http://nuclear.unh.edu/~elong
(603) 862-1962

On Fri 03 May 2013 02:33:54 PM EDT, O. A. Rondon wrote:
> 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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