[Eg6_analysis] The momentum distributions

[Nathan Baltzell]

Thanks Mohammad,

Interesting.  For elastics, at target center dp is about -15MeV,
while at downstream end +30Mev.  Are these plots p/q or p?
Looks maybe like there's an L/R shift too for elastics.

I wonder why this is stronger for elastics than all tracks?
Maybe due to smaller momentum (I think p/q peaks at ~100MeV for
all and ~150 for elastics).  Maybe dp/p would be good to plot
too.  Do you require CLAS-RTPC z match also in unelastic case?

-Nathan



On Mon, 14 Jan 2013 13:52:45 -0600, Stepan Stepanyan <stepanya at jlab.org>  
wrote:

> Hello Mohammed,
>
> Nice, now I can see that the large momentum differences, delta_P,
> are at the ends of the target. So, it looks to me that the old and new
> constants work the same way at the middle of the target while they
> are diverge at the ends. We may consider using the new ones if
> they are the correct ones. I do not know how to check this.
>
> Regards, Stepan
>
> On 1/14/13 2:14 PM, hattawy at ipno.in2p3.fr wrote:
>> Hello all,
>>     Here you can find attached file for the results of the  
>> distributions,
>> For both the elastic events and good track events as well.
>>
>> Best regards,
>> Mohammad.
>>
>>
>>
>>> Dear Mohammed,
>>>
>>> These are interesting results.  And as Stepan mentioned, the
>>> difference between the new and old momentum as a function of
>>> the track's z and phi would be very interesting to see.  It
>>> might also be interesting to remove the elastic requirement
>>> and see how a larger kinematic range is affected (and get you
>>> a lot of quick statistics), although it is of course important
>>> to see the elastics separately too.
>>>
>>> Regards,
>>> Nathan
>>>
>>>
>>>
>>> On Mon, 14 Jan 2013 08:38:53 -0600, <hattawy at ipno.in2p3.fr> wrote:
>>>
>>>> Hi Stepan,
>>>>     In Fact, due to the small number of events, we could not find big
>>>> differences. With the current number of elastic events, both of the
>>>> packages have showen almost the same distributions of delta_z and
>>>> delta_phi, but not exactly the same. Here i attached the plots of
>>>> delta_z for both setup parameters, you can have a look through them.
>>>> Now i am cooking data with size 20 times the data i started with, keep
>>>> in touch with the new results as soon as possible.
>>>>
>>>> Ragards,
>>>> Mohammad.
>>>>
>>>>
>>>>> Hello Mohammad,
>>>>>
>>>>> Thanks for this nice analysis. Did you tried to see if there
>>>>> is any Z-vertex or \Phi dependence to the momentum
>>>>> difference.
>>>>>
>>>>> Regards, Stepan
>>>>>
>>>>> On 1/14/13 5:46 AM, hattawy at ipno.in2p3.fr wrote:
>>>>>> Dear all,
>>>>>>      For the comparison between the momentum distributions between  
>>>>>> the
>>>>>> old
>>>>>> setup parameters of delta_phi and the new ones i have extracted, we
>>>>>> have ~97 of the elastic events in the new setup which are common  
>>>>>> with
>>>>>> the old setup and we have ~1% differnce in the number of the elastic
>>>>>> events between the two setup ( 359 elastic events in the old data,  
>>>>>> 351
>>>>>> elastic events in the new one and 340 events common). For the  
>>>>>> momentum
>>>>>> differene distribution, you can have a look at the attached file, in
>>>>>> which
>>>>>> delta_p = new momentum - old momentum, just for the common elastic
>>>>>> events.
>>>>>> It is mainly a peak centered aroud zero, but there is a tail in the
>>>>>> positive side, in which the momentum constructed with the new
>>>>>> parameters
>>>>>> is higher than the old one. I could not conclude anything with this
>>>>>> number
>>>>>> of elastic events from the distributions of dedx vs. p.
>>>>>> In conclusion, we can go to the next cooking with the current
>>>>>> parameters.
>>>>>>
>>>>>> Best regards,
>>>>>> Mohammad Hattawy.
>>>>>>
>>>>>>
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