60 citations · 120 across the 7 of their papers we have counts for
4 papers · 1 filter
Scalar radius of the pion and two photons into two pions. Strong S-wave final state interactions
J. A. Oller, L. Roca, C. Schat
The quadratic pion scalar radius, <r^2>^π_s, plays an important role for present precise determinations of ππscattering. The solution of the Muskhelishvili-Omnès equations for the…
Excited Baryons in Large Nc QCD: Matching the 1/Nc expansion to quark models using the permutation group S_N
Dan Pirjol, Carlos Schat
We show how to match quark models to the 1/Nc expansion of QCD. As an example we discuss in detail the mass operator of orbitally excited baryons and match it to the one-gluon exch…
The permutation group S_N and large Nc excited baryons
Dan Pirjol, Carlos Schat
We study the excited baryon states for an arbitrary number of colors Nc from the perspective of the permutation group S_N of N objects. Classifying the transformation properties of…
Improved dispersion relations for γγ\to π^0π^0
Jose A. Oller, Luis Roca, Carlos Schat
We perform a dispersive theoretical study of the reaction γγ\to pi^0π^0 emphasizing the low energy region. The large source of theoretical uncertainty to calculate the γγ\toπ^0π^0…