[Theory-seminars] Theory Seminar. TODAY. 1pm. Room L102. Cesar Fernandez-Ramirez

[César Fernández Ramírez]

Theory Seminar
Monday, July 20, 2015
1:00 p.m.
CEBAF Center, L102

Speaker: Cesar Fernandez-Ramirez (Jefferson Lab)

Title: “Amplitude Analysis of KN Scattering"

Abstract: I present a unitary multichannel model for $\bar{K}N$ scattering in the resonance region
that fulfills unitarity, it has the correct analytical properties for the amplitudes once they are extended 
to the complex-s plane and the partial waves have the right threshold behavior. 
To determine the parameters of the model we have fitted 
single-energy partial waves up to J=7/2 and  up to 2.15 GeV of energy 
in the center of mass reference frame obtaining the poles of the Lambda and Sigma resonances,
which are compared to previous analysis.
We provide the most comprehensive picture of the S=-1 hyperon spectrum to the date
and some important differences are found between the available analyses deeming the
gathering of further experimental information on KN scattering
mandatory in order to make progress in the assessment of the 
hyperon spectrum. I will also comment on the Lambda(1405) and its nature.


- - - - -
​‍Dr. César Fernández-Ramírez

Jefferson Lab Theory Center
12000 Jefferson Ave., Newport News, VA 23606, USA

Phone: (+1) 757-269-7844
Fax: (+1) 757-269-7002
E-mail: cesar at jlab.org





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