Quark number densities at imaginary chemical potential in Nf=2 lattice QCD with Wilson fermions and its model analyses

Junichi Takahashi, Hiroaki Kouno, Masanobu Yahiro

研究成果: Contribution to journalArticle査読

23 被引用数 (Scopus)

抄録

We investigate the temperature (T) dependence of quark number densities (nq) at imaginary and real chemical potential (μ) by using Nf=2 lattice QCD and the hadron resonance gas (HRG) model. Quark number densities are calculated at imaginary μ with lattice QCD (LQCD) on an 82×16×4 lattice with the clover-improved Nf=2 Wilson fermion action and the renormalization-group-improved Iwasaki gauge action. The results are consistent with the previous results of the staggered-type quark action. The nq obtained are extrapolated to real μ by assuming the Fourier series for the confinement region and the polynomial series for the deconfinement region. The extrapolated results are consistent with the previous results of the Taylor expansion method for the reweighting factor. The upper bound (μ/T)max of the region where the extrapolation is considered to be reliable is estimated for each temperature T. We test whether T dependence of nucleon and Δ-resonance masses can be determined from LQCD data on nq at imaginary μ by using the HRG model. In the test calculation, nucleon and Δ-resonance masses reduce by about 10% in the vicinity of the pseudocritical temperature.

本文言語英語
論文番号014501
ジャーナルPhysical Review D - Particles, Fields, Gravitation and Cosmology
91
1
DOI
出版ステータス出版済み - 1 7 2015

All Science Journal Classification (ASJC) codes

  • 核物理学および高エネルギー物理学
  • 物理学および天文学(その他)

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