[Clas_hadron] abstract for PANIC11

[Kei Moriya]

Hi Mac,

Thank you for reading the abstract.
Regarding your question, the chiral dynamics
result has been calculated assuming s-wave
meson-baryon interactions, and this fixes
the form of the interaction that generates
the Lambda(1405). Therefore if the spin-parity
were not 1/2-, then this would invalidate
a crucial assumption in the calculation result.
However, since the experimental result shows that
1/2- is the case, there is no contradiction.

The dynamical resonance calculation is a result about
the "dynamics" that generate the resonance, and are
manifested in the lineshapes (=Sigma pi spectrum),
strength of polarization, etc. of the resonance,
i.e., the properties that are specific to that resonance.

On the other hand, the spin-parity is a "kinematics"
attribute that does not predict any parameters for
the resonance, but simply define the basis for which
all dynamical theories for that resonance must obey
(i.e., for the Lambda(1405) that the decay distribution
must be flat for Sigma pi, and how the polarization is
transferred to the Sigma etc.).

Regards,

	Kei

(1/28/11 1:24 PM), Mac Mestayer wrote:
> Hello Kei;
>
> Your abstract is well-written and interesting.
> Because it is an experimental result, you are certainly
> justified in drawing conclusions from the observed
> phenomenology. However, I have a basic (perhaps naive)
> question: is there a contradiction between the observation
> that the Lam1405 is in a definite 1/2 - state and the
> conclusion that it has strong dynamical components that
> distinguish it from other known resonances?
>
> I certainly think you should submit the abstact; just
> wanted to bring up the issue of interpretation of the results.
>
> regards, Mac
>
>
>
> "mestayer at jlab.org", (757)-269-7252
>
> On Wed, 26 Jan 2011, Kei Moriya wrote:
>
>>
>> Dear Spectroscopists,
>>
>> I am planning to submit an abstract for PANIC11,
>> held at MIT in July this year.
>>
>> My talk will concern the Lambda(1405) research based on
>> the g11a dataset that I worked on for my thesis.
>> Results shown will include the lineshapes of each Sigma pi
>> decay mode, the differential cross sections, and also the
>> spin-parity analysis.
>>
>> My abstract in pdf format can be found at:
>> http://www.jlab.org/Hall-B/secure/hadron/abstracts/2011/PANIC11_Kei-Moriya.pdf
>> Any kind of feedback is very welcome.
>> Please send all comments to clas_hadron at jlab.org
>>
>> Thank you.
>>
>> Kei Moriya
>> _______________________________________________
>> Clas_hadron mailing list
>> Clas_hadron at jlab.org
>> https://mailman.jlab.org/mailman/listinfo/clas_hadron
>>
>