[Eg6_analysis] The momentum distributions

[Nathan Baltzell]

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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