# The 8th International Workshop on Chiral Dynamics 2015

June 29, 2015 to July 3, 2015
Pisa
Europe/Rome timezone

## Progress in the quest for a realistic three-nucleon force

Jun 30, 2015, 3:15 PM
15m
Room PS1 (Building E, Polo Fibonacci, Pisa)

### Room PS1

#### Building E, Polo Fibonacci, Pisa

Talk Few-Body Physics Working Group

### Speaker

Luca Girlanda (Universita del Salento, Lecce & INFN-Lecce)

### Description

Despite long-lasting efforts in the determination of a realistic three-nucleon force (TNF), none of the presently available models leads to a satisfactory description of bound and scattering states of the $A=3$ system. It seems natural to ascribe the above situation to the fact that these models include a very small number of adjustable parameters, compared to the two-nucleon interaction case. For example, in the framework of the chiral expansion, only 2 low-energy constants (LECs) enter up to and including N3LO. At the following order (N4LO) one encounters 10 additional LECs, which parametrize the short-range component of the TNF, and are unconstrained by chiral symmetry. As such, they could provide the necessary flexibility to arrive at a truly realistic model for the TNF. In this contribution we will report about our progress along these lines. In particular we examine to which extent the AV18 $NN$ interaction, supplemented by the leading and subleading contact-range TNF, provides a satisfactory fit to $N-d$ scattering data.

### Primary author

Luca Girlanda (Universita del Salento, Lecce & INFN-Lecce)

 Slides