[Theory-seminars] REMiNDER, Today 2:00pm, Room F224 - Carlos Granados

[Alessandro Pilloni]

Dear all,
remind the seminar today at 2PM

> 
> Theory Center Seminar
> Wednesday, May 17
> 2:00pm
> CEBAF Center, Room F224
> 
> Carlos Granados (CNU)
> Hyperon transition form factors
> The electromagnetic form factors for the transition of a Sigma to a Lambda hyperon at low energy 
> are calculated using dispersion theory. In this approach we consider the two pion cut of the
> transition, in which the imaginary part of the form factors is written as a direct product of the
> of the two-pion-Sigma-Lambda amplitudes and the complex conjugate of the pion form factor. A
> procedure combining dispersion theory and (NLO) baryon chiral perturbation theory is also used in
> computing the two-pion-Sigma-Lambda amplitudes including a two pion rescattering contribution.
> It is also found that the inclusion of decuplet baryons in the intermediate state of the transition
> is necessary in order to obtain reasonable results, consistent with overall expectations. Through
> this approach, the electric transition form factor remains very small while the magnetic form factor
> depends strongly on a not well defi
ned low-energy constant of the NLO Lagrangian. The predictive
> power of this approach will be enhanced by signi
cantly constraining this constant from a measurement 
> of the magnetic transition radius. Such a measurement can be performed at the future Facility
> for Antiproton and Ion Research (FAIR).
> 

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