[g13] Sector 4 problems in g13b data

[nivanov at jlab.org]

Hi Paul,

Thank you for explanations.
Note also that the quantities (\Delta p/p) in Sector 4 is not so small
that you believe: they want to be about 20% for \teta>40.

Do anybody remember where was cutoff between 'good' and 'bad' runs?
Could this cutoff separate v1 and v2?

Thank you,
Nickolay



> The first 2/3rds of the g13b runs didn't have the DC alignment
> constants properly extended over the run range.  They used the old DC
> alignment constants, for which the largest problem was in Sector 4.
> 2/3rds the way through cooking g13b the problem was noticed and
> corrected, and so the last ~1/3 of the g13b runs are fine (and all of
> g13a) (I don't remember which run number is the cutoff).  In Sector 4
> I believe the problem was on the order of 3%.
>
>   - Paul
>
> On Dec 3, 2009, at 10:41 AM, nivanov at jlab.org wrote:
>
> Hi Pawel,
>
> We analyzing all the runs for 1.3<Eg<1.5 GeV.
>
> When you suggested to consider last 1/3 runs only?
>
> Best,
> Nickolay
>
>
>
>> Dear Nickolay,
>>
>> Which runs are you analyzing? The last 1/3 I hope, as was suggested?
>>
>> Best Regards,
>>
>>    Pawel
>>
>> nivanov at jlab.org wrote:
>>> Dear g13,
>>>
>>> Analyzing the azimuthal dependence of the deuteron
>>> photodisintegration
>>> in g13b, we found surprising problems with Sector 4 (150<\phi<210).
>>> Practically all the proton distributions in Sector 4 differ
>>> essentially
>>> from corresponding ones in other sectors. In particular, in
>>> http://www.jlab.org/~nivanov/Preliminary_mass.ppt
>>> both the TOF and missing mass distributions of the proton are
>>> presented
>>> for sectors 3 and 4 (at \teta>40). One can see a sizable
>>> difference...
>>>
>>> Do anyone know what takes place in sector 4?
>>> TOF problems?
>>>
>>> Thank you,
>>> Nickolay Ivanov
>>>
>>>
>>>
>>>
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>>>
>>
>
>
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