MAM Seminar: Positivity constraints on chiral low-energy constants for pion-nucleon scattering

Thursday May 22 2013, 2:00pm - Coffee room 

Speaker:Juan Jose Sanz-Cillero

Abstract:

Positivity constraints on the chiral low energy constants of the pion-nucleon Lagrangian
up to the O(p4) level are derived with the help of axiomatic principles, such as analyticity, crossing
symmetry and unitarity, in the upper part of Mandelstam triangle.

 I will show the basic recipes and steps that one needs to follow in order to derive this type of constraints. We find that these constraints are well respected numerically, when considering the existing fit results from covariant baryon chiral perturbation theory using extended-on-mass-shell scheme.

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