Seminar

Nucleon-nucleon effective field theory with dibaryon fields

By
Joan Soto (UB)
Date
Place
Aula 507
seminar ICCUB
I will introduce a non-relativistic effective field theory for low energy nucleons that includes explicit dibaryon fields in addition to nucleons and pions. The calculations can be carried out in dimensional regularization and standard minimal subtraction scheme, and hence the power counting becomes explicit. I will present results at NLO and NNLO for the nucleon-nucleon phase shifts in the 1S0 and 3S1-3D1 channels. The outcome is analogous to that of the KSW approach. I will finally show how this effective theory facilitates the resummation of a certain class of diagrams, involving the so called radiation pions, that may give rise to large contributions to the scattering lengths. Recent results on chiral extrapolation formulas for the latter will be presented.
NOTES

Notice unusual time.