[Eg6_analysis] IC calibration

[Dupré Raphaël]

It is high energy pi0! (The exact cut should be indicated on the page)

On Tue, Aug 27, 2013 at 3:00 PM, Stepan Stepanyan <stepanya at jlab.org> wrote:
> Raphael,
>
> Thanks for explanations. We will have a meeting this coming Thursday.
>
> By the way, I sue to think that pi0 mass peak with for IC was 7 MeV,
> why are we getting 11 MeV?
>
> Stepan
>
>
> On 8/27/13 8:56 AM, Dupré Raphaël wrote:
>>
>> Dear Stepan,
>>
>> Mohammad has comparisons for missing energy and other variables too,
>> he can show them in a future meeting. In particular, the RMS for
>> missing energy was reduced for incoherent (I did not see coherent). We
>> chose to illustrate with the pi0 mass peak since it is simpler to
>> interpret, we do not expect contamination effects and it depends only
>> on photon kinematic and energy.
>>
>> Best,
>>
>> On Tue, Aug 27, 2013 at 2:46 PM, Stepan Stepanyan<stepanya at jlab.org>
>> wrote:
>>>
>>> Hello Mohammad,
>>>
>>> My first thoughts will be it does not matter what corrections you will
>>> use.
>>> Just keep in mind that getting a narrower pi0 peak is not the ultimate
>>> goal.
>>> The goal is to get energy and angles of photons measured correctly, since
>>> that is what will end up in your calculations of kinematics for DVCS.
>>>
>>> Regards, Stepan
>>>
>>>
>>> On 8/26/13 12:07 PM, Mohammad Hattawy wrote:
>>>>
>>>> Dear all,
>>>>     Following the work of IC calibration. Firstly, i corrected the
>>>> energy
>>>> and the time dependence separately which can be found in the link
>>>>
>>>> (https://clasweb.jlab.org/rungroups/lowq/wiki/index.php/User:Hattawy/IC_calibration
>>>> ). A new Method of correcting both at the same time is done and can be
>>>> found
>>>> in the link
>>>> (https://clasweb.jlab.org/rungroups/lowq/wiki/index.php/IC_calibration).
>>>>     As a result, from the side of the number of DVCS events, both
>>>> methods
>>>> gave almost the same numbers, while a gain of 0.4  MeV in the width of
>>>> the
>>>> reconstructed signal of pi0 has been achieved with the second method.
>>>>     Suggestions and comments are welcome.
>>>>
>>>>
>>>> --
>>>> Best regards,
>>>> Mohammad Hattawy.
>>
>>
>>
>



-- 
Raphaël Dupré