6 papers
Emergent four-body parameter in universal two-species bosonic systems
Lorenzo Contessi, Johannes Kirscher, Manuel Pavon Valderrama
The description of unitary few-boson systems is conceptually simple: only one parameter -- the three-body binding energy -- is required to predict the binding energies of clusters…
Triple-X and beyond: hadronic systems of three and more X(3872)
Lorenzo Contessi, Johannes Kirscher, Manuel Pavon Valderrama
The resonance has been conjectured to be a charm meson-antimeson two-body molecule. Meanwhile, there is no experimental evidence for larger, few-body co…
Multi-fermion systems with contact theories
Martin Schäfer, Lorenzo Contessi, Johannes Kirscher +1
We address the question of minimal requirements for the existence of quantum bound states. In particular, we demonstrate that a few-body system with zero-range momentum-independent…
B(He) from short range effective field theory
Lorenzo Contessi, Nir Barnea, Avraham Gal
We present an effective field theory (EFT) at leading order to describe light single- hypernuclei. Owing to the weak binding and to the short interaction range, meson e…
The onset of hypernuclear binding
L. Contessi, M. Schäfer, N. Barnea +2
Binding energies of light, , hypernuclei are calculated using the stochastic variational method in a pionless effective field theory (EFT) approach at leading order w…
Resolving the hypernuclear overbinding problem in pionless effective field theory
Lorenzo Contessi, Nir Barnea, Avraham Gal
We address the -hypernuclear `overbinding problem' in light hypernuclei which stands for a 1--3 MeV excessive separation energy calculated in He. This problem arises i…