[Clas_cascades] {SpamScore: ssss}Re: eg3 data analysis

[Mac Mestayer]

Hello Igor;

Why don't you call Ralf on the phone?  I'm sure you
could clear up the various mis-understandings more
quickly that way.
 				- Mac

"mestayer at jlab.org", (757)-269-7252

On Tue, 21 Sep 2010, Igor Strakovsky wrote:

> Dear Ralf,
>
> On Mon, 20 Sep 2010 07:52:16 -0400, Ralf W Gothe <gothe at physics.sc.edu> wrote:
>
>>>> As Zhiwen already pointed out to you, you may find it on our wiki page
>>>> or in his slides e.g.
>>>> http://www.jlab.org/Hall-B/secure/hadron/meetings/19mar10/hadron20100319_zwzhao_Lambda1520Theta+.pdf
>>>
>>> I've looked through Zhiwen's slides, but I could not find a picture that
>>> I asked Zhiwen to show me. If you mean a particular slide, please let
>>> me know which one.
>> I thought your "KS plot" is the one Zhiwen talked about, i.e. the invariant
>> mass of the K-short?!
>
> Nope, I asked a plot for recoil Ks.  Can I see it?
>
>>> BTW, the slide of p21 gives a very intriguing picture. It shows data and
>>> simulation for the proton momentum distribution. They exactly coincide at
>>> P<0.2 GeV/c(?), where direct detection of protons in CLAS is technically
>>> impossible. However, in the whole region P>0.2 GeV/c, where the direct
>>> detection is possible, the data and simulation are strongly different,
>>> up to 10 times or even more.
>>>
>>> Could you please explain why the boundary between good and bad agreement
>>> of data and simulation is just the lowest detected momentum?
>>>
>> If we trust the Deuteron model that goes into the simulation, then as you
>> know the difference is that neutron is not purely quasi-free.
>
> First of all, you did not answer my question which is crystal, I hope
> Then, I cannot understand your point.  Can you please be more specific?
>
>>> OK, one question on just this slide 21 was formulated above. Here is one
>>> more question. The slide shows the proton momentum distribution in the
>>> log scale.
>>>
>>> Is it possible to see a linear scale for P<250 MeV/c or so?
>
>> I don't have the source, but Zhiwen could produce it.
>
> I would love to see it.
>
>>> BTW, if you are going to use impulse approximation (spectator mechanism),
>>> you have to keep your cut on the level P<50 MeV/c (average momentum of
>>> the nucleon in the deuteron), not P<200 MeV/c.
>>>
>> No matter where you cut, you always have non-quasi-free contributions, which
>> can never be determined precisely.
>
> What?  What are you talking about?
>
>>> And an additional question. For me, the missing proton mass distributions
>>> (p20} look too broad. It means for me that your proton momentum recovery
>>> might be not sufficiently good.
>
> And ???
>
> Thanks, Igor
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