Speaker
Dr
Lisheng Geng
(Beihang University)
Description
Over the past twenty years, one has seen remarkable progress in ab initio studies of nuclear structure and reactions with chiral nuclear forces. In a series of recent studies [1-5], we have shown that it is possible to construct chiral nuclear forces using covariant baryon chiral perturbation theory, which enjoy a number of appealing features. For instance, they are manifestly covariant and therefore can be applied in ab initio studies based on covariant frameworks, such as the Dirac-Brueckner Hartree-Fock approach. Second, they converge relatively faster than their non-relativistic counterparts both in the two-body [1-5] and in the three-body sector [6]. In this talk, we explain in detail how they are built from covariant baryon chiral perturbation theory [1,2], highlight their applications to lattice QCD simulations in the hyperon-nucleon/hyperon sector [3,4], and show the recent progress in going to higher chiral orders in this endeavor [5,7].
References:
1) Leading order relativistic chiral nucleon-nucleon interaction, Xiu-Lei Ren, Kai-Wen Li, Li-Sheng Geng, Bing-Wei Long, Peter Ring, Jie Meng, arXiv:1611.08475 [nucl-th], Chin.Phys. C42 (2018), 014103.
2) Leading order relativistic hyperon-nucleon interactions in chiral effective field theory, Kai-Wen Li, Xiu-Lei Ren, Li-Sheng Geng, Bing-Wei Long, arXiv:1612.08482 [nucl-th], Chin.Phys. C42 (2018), 014105.
3) Strangeness S=−1 hyperon-nucleon interactions: Chiral effective field theory versus lattice QCD, Jing Song, Kai-Wen Li, Li-Sheng Geng, arXiv:1802.04433 [nucl-th], Phys.Rev. C97 (2018), 065201.
4) Strangeness $S=-2$ baryon-baryon interactions in relativistic chiral effective field theory, Kai-Wen Li, Tetsuo Hyodo, Li-Sheng Geng, arXiv:1809.03199 [nucl-th], Phys.Rev. C98 (2018), 065203.
5) Covariant chiral nucleon-nucleon contact Lagrangian up to order $\mathcal{O}(q^4)$, Yang Xiao, Li-Sheng Geng, Xiu-Lei Ren, arXiv:1812.03005 [nucl-th].
6) Short-range three-nucleon interaction from A=3 data and its hierarchical structure, L. Girlanda, A. Kievsky, M. Viviani, L.E. Marcucci, arXiv:1811.09398 [nucl-th].
7）Meson-baryon scattering up to the next-to-next-to-leading order in covariant baryon chiral perturbation theory, Jung-Xu Lu, Li-Sheng Geng, Xiu-Lei Ren, Meng-Lin Du, arXiv:1812.03799 [nucl-th], Phys.Rev. D99 (2019) 054024.
Primary author
Dr
Lisheng Geng
(Beihang University)
