期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 2, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP02(2021)060
关键词
Lattice QCD; Lattice Quantum Field Theory
资金
- Spanish project [FPA2017-85985-P]
- Generalitat Valenciana grant [PROMETEO/2019/083]
- European Union Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant [713673]
- La Caixa Foundation [100010434, LCF/BQ/IN17/11620044]
- Gauss Centre for Supercomputing e.V.
- [H2020-MSCA-ITN2015/674896-ELUSIVES]
- [H2020-MSCA-RISE-2015/690575]
The paper presents a general method for deriving the energy shift of an interacting system of N spinless particles using nonrelativistic effective field theory, with relativistic corrections explicitly included. This method is applied to obtain the ground state of N particles and the first excited state of two and three particles to a certain order, based on the threshold parameters of relativistic scattering amplitudes. The resulting expressions are used to analyze the N-particle ground state energy shift in the complex phi (4) theory.
We present a general method for deriving the energy shift of an interacting system of N spinless particles in a finite volume. To this end, we use the nonrelativistic effective field theory (NREFT), and match the pertinent low-energy constants to the scattering amplitudes. Relativistic corrections are explicitly included up to a given order in the 1/L expansion. We apply this method to obtain the ground state of N particles, and the first excited state of two and three particles to order L-6 in terms of the threshold parameters of the two- and three-particle relativistic scattering amplitudes. We use these expressions to analyze the N-particle ground state energy shift in the complex phi (4) theory.
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