Practical approach to the sign problem at finite theta-vacuum angle

Takahiro Sasaki, Hiroaki Kouno, Masanobu Yahiro

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We investigate a way of circumventing the sign problem in lattice QCD simulations with a theta-vacuum term, using the Polyakov-loop extended Nambu-Jona-Lasinio model. We consider the reweighting method for the QCD Lagrangian after the UA(1) transformation. In the Lagrangian, the P-odd mass term as a cause of the sign problem is minimized. In order to find a good reference system in the reweighting method, we estimate the average reweighting factor by using the two-flavor Polyakov-loop extended Nambu-Jona-Lasinio model and eventually find a good reference system.

Original languageEnglish
Article number056003
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number5
Publication statusPublished - Mar 8 2013

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)


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