[Eg6_analysis] The momentum distributions

[hattawy at ipno.in2p3.fr]

Hello all,
  These plots are for p not p/q. The reason why we have the main
difference at the end of the target, is i am doing the fitting of
delta_phi vs.TDC over all the interval of Z, while i think before it was
fitted just for the middle region before. Nathan, For the good track
events, i am not including the z match for the good track events, just (
sdist, edist, x2, r_0,  number of photoelectrons>25, npd_track and one
electron is going in clas). For dp/p, you can find attached file for the
this distribution in the case of good events.

Regards,
Mohammad.

> 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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