[b1_ana] Rates Update

[O. A. Rondon]

Hi Ellie,

No problem if the high x side of the highest x bin does not reach 1. I
meant to say that it can include as much high range as the spectrometer
can accept.

But there is clear overlap between bins now, which we need to avoid.

Thank you and cheers,

Oscar


Elena Long wrote:
> 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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>>>
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>>
>>
>