13-17 June 2016
Niigata University (Ikarashi Campus)
Asia/Tokyo timezone

Critical line in finite temperature and density lattice QCD by O(4) scaling analysis

15 Jun 2016, 16:30
1h 30m
Library Hall, Central Library (Niigata University (Ikarashi Campus))

Library Hall, Central Library

Niigata University (Ikarashi Campus)

Central Library, Niigata University (Ikarashi Campus), 8050 Ikarashi 2-nocho, Nishi-ku Niigata City, 950-2181, Japan
Board: 20
Poster Presentation Posters


Mr Ryo IWAMI (Niigata University)


We study scaling behavior of a chiral order parameter in the low density region, performing a simulation of two-flavor lattice QCD with improved Wilson quarks. It have been confirmed that the scaling behavior of the chiral order parameter defined by a Ward-Takahashi identity agrees with the scaling function of the three-dimensional O(4) spin model at zero chemical potential. We discuss the scaling properties of the chiral phase transition at finite density, applying the reweighting method and calculating derivatives of the chiral order parameter with respect to the chemical potential. In the comparison between the scaling functions of the O(4) spin model and QCD at low density, there is a fit parameter which can be interpreted as the curvature of the chiral phase transition curve in the QCD phase diagram with respect to temperature and chemical potential. We determine the curvature of the phase boundary by the fitting. The physical scale is set by the gradient flow.

Primary author

Mr Ryo IWAMI (Niigata University)


Mr Atsushi Uji (Niigata Univ.) Dr Hiroshi Ohno (Univ. Tsukuba) Prof. Kazuyuki Kanaya (Univ. Tsukuba) Mr Naoki Wakabayashi (Niigata Univ.) Dr Shinji Ejiri (Niigata University) Dr Shinsuke Yoshida (CCNU) Dr Takashi Umeda (Hiroshima Univ.)

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