We show how nuclear effective field theory (EFT) and ab initio nuclear-structure methods can turn input from lattice quantum chromodynamics (LQCD) into predictions for the properties of nuclei. argue that pionless EFT is appropriate to describe light nuclei obtained in LQCD simulations carried out at pion masses heavier than physical mass. solve using effective-interaction hyperspherical harmonics auxiliary-field diffusion Monte Carlo methods. Fitting three leading-order parameters deuteron,...

We extend the prediction range of Pionless Effective Field Theory with an analysis ground state 16O in leading order. To renormalize theory, we use as input both experimental data and lattice QCD predictions nuclear observables, which probe sensitivity nuclei to increased quark masses. The many-body Schrödinger equation is solved Auxiliary Diffusion Monte Carlo method. For first time a quantum calculation, linear optimization procedure, allows us devise accurate trial wave function large...

We address the $\Lambda$-hypernuclear `overbinding problem' in light hypernuclei which stands for a 1--3 MeV excessive $\Lambda$ separation energy calculated $_{\Lambda}^5$He. This problem arises most few-body calculations that reproduce ground-state energies lighter within various hyperon-nucleon interaction models. Recent pionless effective field theory nuclear are extended this work to hypernuclei. At leading order, $\Lambda N$ low-energy constants associated with scattering lengths and...

We consider a possible resummation of subleading effects in two-body systems with large scattering length as described by short-range effective field theory (EFT). In particular, we investigate the consequences part range corrections. Explicit calculations phase shifts and charge form factor indicate that, except for extreme choices, resummations do not alter convergence EFT expansion are often beneficial at lowest orders. have considered when regulator cutoff is removed well it finite, find...

Binding energies of light, A≤6, ΛΛ hypernuclei are calculated using the stochastic variational method in a pionless effective field theory (π̸EFT) approach at leading order with purpose assessing critically onset binding strangeness S=−2 hadronic sector. The π̸EFT input this sector consists (i) contact term constrained by scattering length aΛΛ, range values compatible correlations observed relativistic heavy ion collisions, and (ii) ΛΛN only available A≤6 hypernucler energy datum ΛΛ6He....

We present an improved action for renormalizable effective field theories (EFTs) of systems near the two-body unitarity limit. The ordering EFT interactions is constrained, but not entirely fixed, by renormalization group. remaining freedom can be used to improve theory's convergence, simplify its applications, and connect it phenomenological models. exemplify method on a contact theory applied up five $^{4}\mathrm{He}$ atoms. solve at leading order including subleading interaction that...

We obtain the s- and p-wave low-energy scattering parameters for n3H elastic position of 4H Jπ=1− resonance using pionless effective field theory at leading order. Results are extracted with three numerical techniques: confining system in a harmonic oscillator trap, solving Faddeev-Yakubovsky equations configuration space, an two-body cluster approach. The renormalization relevant amplitudes is assessed cutoff-regulator range between 1fm−1 10fm−1. Most remarkably, we find...

We address the question of minimal requirements for existence quantum bound states. In particular, we demonstrate that a few-body system with zero-range momentum-independent two-body interactions is unstable against decay into clusters, if mixed-symmetry its wave function enforced. claim any theory in which scattering length much larger than other scale involved exhibits such instability. exemplify this inability leading-order pionless effective field to describe stable states A>4 nuclei. A...

We present an effective field theory (EFT) at leading order to describe light single-$\Lambda$ hypernuclei. Owing the weak $\Lambda$ binding and $\Lambda N$ short interaction range, meson exchange forces are approximated by contact interactions within a pionless EFT where only degrees of freedom baryons. At order, $\Lambda$-nuclear contains two 2-body (singlet triplet) three 3-body terms, total 5 terms associated with coupling strengths or low energy constants (LECs). adopt LECs from...

We consider few-body systems in which only a certain subset of the particle-particle interactions is resonant. characterize each by unitary graph vertices represent distinguishable particles and edges resonant two-body interactions. Few-body whose connected will collapse unless repulsive three-body interaction included. find two categories graphs, distinguished kind repulsion necessary to stabilize associated system. Each category characterized whether contains loop or not: for tree-like...

We consider a possible resummation of subleading effects in two-body systems with large scattering length as described by short-range effective field theory (EFT). In particular, we investigate the consequences part range corrections. Explicit calculations phase shifts and charge form factor indicate that, except for extreme choices, resummations do not alter convergence EFT expansion are often beneficial at lowest orders. have considered when regulator cutoff is removed well it finite, find...

The description of unitary few-boson systems is conceptually simple: only one parameter -- the three-body binding energy required to predict energies clusters with an arbitrary number bosons. Whether this correlation between three- and many-boson still holds for two species bosons which inter-species interaction resonant depends on how many particles each are in system. For few-body $A$ $B$ a $AB$ interaction, it known that emergent $AAB$ $ABB$ scales correlated ground-state $AAAB$ $ABBB$...

The $X(3872)$ resonance has been conjectured to be a $J^{PC} = 1^{++}$ charm meson-antimeson two-body molecule. Meanwhile, there is no experimental evidence for larger, few-body compounds of multiple pairs which would resemble larger molecules or nuclei. Here, we investigate such multi-meson states the extent what can deduced theoretically from essentials interaction between uncharged $D^{0}$ and $D^{*0}$ mesons. From molecular $X(3872)$, predict $4X$ ($4^{++}$) octamer with binding energy...

We consider few-body systems in which only a certain subset of the particle-particle interactions is resonant. characterize each by {\it unitary graph} vertices represent distinguishable particles and edges resonant 2-body interactions. Few-body whose graph connected will collapse unless repulsive 3-body interaction included. find two categories graphs, distinguished kind repulsion necessary to stabilize associated system. Each category characterized whether contains loop or not: for...

We present an improved action for renormalizable effective field theories (EFTs) of systems near the two-body unitarity limit. The ordering EFT interactions is constrained, but not entirely fixed, by renormalization group. remaining freedom can be used to improve theory's convergence, simplify its applications, and connect it phenomenological models. exemplify method on a contact theory applied up five $^4$He atoms. solve at leading order including subleading interaction that accounts part...

Light hypernuclei containing one or two Λ baryons are the subject of an ongoing experimental campaign aiming to study spectrum these systems, as well 2 and 3-body interaction between hyperons nucleons. Here we shortly review theoretical systems within framework baryonic effective field theory.