期刊
EUROPEAN PHYSICAL JOURNAL C
卷 78, 期 10, 页码 -出版社
SPRINGER
DOI: 10.1140/epjc/s10052-018-6325-8
关键词
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资金
- DFG [CRC 110]
- Volkswagenstiftung [93562]
- Shota Rustaveli National Science Foundation (SRNSF) [DI-2016-26]
- European Union [713673]
- BCGS
We calculate the one-, two- and three-particle energy levels for different lattice volumes in the complex phi(4) theory on the lattice. We argue that the exponentially suppressed finite-volume corrections for the two- and three-particle energy shifts can be reduced significantly by using the single particle mass, which includes the finite-size effects. We show numerically that, for a set of bare parameters, corresponding to the weak repulsive interaction, one can reliably extract the two- and three-particle energy shifts. From those, we extract the scattering length, the effective range and the effective three-body coupling. We show that the parameters, extracted from the two- and three-particle energy shifts, are consistent. Moreover, the effective three-body coupling is significantly different from zero.
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