### Conveners

#### Parallel Session 4 - Few-Body Physics WG

- Akaki Rusetsky (HISKP, University of Bonn)
- Assumpta Parreno Garcia (University of Barcelona)
- Dean Lee (North Carolina State University)

Daniel Phillips
(Ohio University, Athens)

6/30/15, 4:20 PM

Few-Body Physics Working Group

Talk

I will show that combining effective field theories (EFTs) with Bayesian data analysis facilitates the rigorous quantification of theoretical uncertainties [1]. Bayesian methods are sometimes attacked on the grounds that the use of priors produces a subjective result. I will argue that, in fact, incorporating priors in the analysis permits the consistent application of analysis assumptions...

Harald W. Griesshammer
(George Washington University, Washington)

6/30/15, 4:45 PM

Few-Body Physics Working Group

Talk

The past few years have witnessed a renewed emphasis of the need to quantify residual theoretical uncertainties [1,2]. Ideally, “double-blind” calculations would assess them based on input and method, and not by comparison to data. This is particularly important if data is absent or its consistency needs to be checked. Effective Field Theories promise a well-defined scheme to provide such...

Johann Haidenbauer
(IKP, Forschungszentrum Juelich)

6/30/15, 5:00 PM

Few-Body Physics Working Group

Talk

We present results for the in-medium properties of a hyperon-nucleon (Y N) interaction derived within chiral effective field theory (EFT) and fitted to ΛN and ΣN scattering data. The single-particle potentials for the Λ and Σ hyperons in nuclear matter are evaluated in a conventional G-matrix calculation, and the Scheerbaum factor associated with the hyperon-nucleus spin-orbit interaction is...

Yordanka Ilieva
(University of South Carolina, Columbia)

6/30/15, 5:15 PM

Few-Body Physics Working Group

Talk

Theoretical studies suggest that experimental observables for hyperon production reactions can place stringent constraints on the free parameters of hyperon-nucleon potentials, which are critical for the understanding of hypernuclear matter and neutron stars. We will present preliminary experimental results for the polarization observables Σ, Py, Ox, Oz, Cx, and Cz for final-state interactions...

Xian-Wei Kang
(IAS and IKP, Forschungszentrum Jülich)

6/30/15, 5:30 PM

Few-Body Physics Working Group

Talk

The recent development of the antinucleon-nucleon (N-bar N) interaction in chiral effective
field theory [1] will be reported and the phenomenological meson-exchange models (taking Julich model as an example) will be mentioned as well. With such potentials and the distorted-wave Born approximation, we examine the influence of the antiproton-proton (p-bar p) interaction on the mass spectrum in...

Domenico Logoteta
(INFN-Pisa)

6/30/15, 5:45 PM

Few-Body Physics Working Group

Talk

We calculate the energy per particle of symmetric nuclear matter and pure neutron matter using the many-body Brueckner-Hartree-Fock (BHF) approach and employing the Chiral Next-to-next-to-next-to leading order (N3LO) nucleon-nucleon (NN) potential supplemented with various parametrizations of the Chiral Next-to-next-to leading order (N2LO) three-nucleon force. Such combination is able to...

Betzalel Bazak
(Racah Institute of Physics, The Hebrew University of Jerusalem)

6/30/15, 6:00 PM

Few-Body Physics Working Group

Talk

Recently, Tan suggested that the properties of universal quantum gases depend on a new characteristic quantity, called the contact. The contact describes the probability of two particles coming close to each other, i.e. it is a measure of the number of close particle pairs in the system. Utilizing the contact, this theory predicts the energy, pressure and other properties of the system. It was...