ICCUB Seminar

Constraining effective field theories for baryon-baryon interactions with lattice QCD

By Marc Illa (ICCUB)   

Thursday 25 Feb , 11:00:00

Place: Zoom


The difference in the level of understanding between baryonic systems containing strangeness and the usual nuclear matter is so large due to the scarcity of experimental data. This limits the constraints that can be put on the low-energy coefficients appearing in the effective field theory (EFT) Lagrangian describing the interaction between two non-relativistic octet baryons. Trying to bridge this gap is lattice QCD, a demanding numerical approach to solve the complex dynamics of strongly-interacting systems. In this talk, I will present the results obtained by the NPLQCD collaboration for two octet-baryon systems, with strangeness ranging from 0 to -4, at two sets of quark masses that are heavier than those in nature [1,2]. In particular, I will present their scattering parameters and binding energies, as well as the constraints on the relevant EFT coefficients. The findings point to interesting symmetries observed in hypernuclear forces as predicted in the limit of QCD with a large number of colors.

[1] M. L. Wagman et al. (NPLQCD) Baryon-Baryon Interactions and Spin-Flavor Symmetry from Lattice Quantum Chromodynamics, Phys. Rev. D 96, 114510 (2017); arXiv:1706.06550 [hep-lat]

[2] M. Illa et al. (NPLQCD) Low-energy Scattering and Effective Interactions of Two Baryons at mπ ∼ 450 MeV from Lattice Quantum Chromodynamics; arXiv:2009.12357 [hep-lat]