Heavy-quark free energy, Debye mass, and spatial string tension at finite temperature in two flavor lattice QCD with Wilson quark action

Maezawa, Y.; Ukita, N.; Aoki, Sinya; Ejiri, Shinji; Hatsuda, Tetsuo; Ishii, Noriyoshi; Kanaya, K.

doi:10.1103/physrevd.75.074501

Cited by 67 publications

(111 citation statements)

References 40 publications

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“…We adopt the same lattice actions as in our previous study at µ q = 0 [24]. We use the RG-improved Iwasaki gauge action [25] and the N f = 2 clover-improved Wilson quark action [26] defined by…”

Section: A Lattice Actionmentioning

confidence: 99%

Equation of state and heavy-quark free energy at finite temperature and density in two flavor lattice QCD with Wilson quark action

et al. 2010

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We study the equation of state at finite temperature and density in two-flavor QCD with the RGimproved gluon action and the clover-improved Wilson quark action on a 16 3 × 4 lattice. Along the lines of constant physics at mPS/mV = 0.65 and 0.80, we compute the second and forth derivatives of the grand canonical partition function with respect to the quark chemical potential µq = (µu +µ d )/2 and the isospin chemical potential µI = (µu − µ d )/2 at vanishing chemical potentials, and study the behaviors of thermodynamic quantities at finite µq using these derivatives for the case µI = 0. In particular, we study density fluctuations at nonezero temperature and density by calculating the quark number and isospin susceptibilities and their derivatives with respect to µq. To suppress statistical fluctuations, we also examine new techniques applicable at low densities. We find a large enhancement in the fluctuation of quark number when the density increased near the pseudocritical temperature, suggesting a critical point at finite µq terminating the first order transition line between hadronic and quark gluon plasma phases. This result agrees with the previous results using staggered-type quark actions qualitatively. Furthermore, we study heavy-quark free energies and Debye screening masses at finite density by measuring the first and second derivatives of these quantities for various color channels of heavy quark-quark and quark-anti-quark pairs. The results suggest that, to the leading order of µq, the interaction between two quarks becomes stronger at finite densities, while that between quark and anti-quark becomes weaker.

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Section: A Lattice Actionmentioning

confidence: 99%

Equation of state and heavy-quark free energy at finite temperature and density in two flavor lattice QCD with Wilson quark action

et al. 2010

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“…Therefore, it is important to compare these two screening masses. The gluon screening-mass (so called Debye screening mass) has been studied from the Polyakov-line correlator based on the Taylor expansion method using the same gauge configurations [2,3]. The Debye screening mass is also expressed as power series ofμ, /T ), respectively.…”

Section: Comparison With Gluon Screening-massesmentioning

confidence: 99%

“…We utilize the gauge configurations generated by WHOT-QCD Collaboration on 16 3 × 4 lattice with the renormalization-group improved Iwasaki gauge action and N f = 2 clover-improved Wilson quark action [2,3] Fig. 1(b).…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…In this article, we focus on screening masses of mesons in pseudo-scalar (PS) and vector (V) channels calculated from the spatial correlation functions, and present current results of our group in lattice QCD simulations with two flavors of the Wilson-type quark action. Using gauge configurations generated by WHOT-QCD Collaboration [2,3], we calculate the meson correlation functions along the line of constant physics and extract temperature dependence of the meson screening-masses from long spatial-distance behavior of the correlators.…”

Section: Introductionmentioning

confidence: 99%

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Hadron properties at finite temperature and density with two-flavors of Wilson fermion

Iida¹,

Maezawa²,

Yazaki³

2011

Proceedings of the XXVIII International Symposium on Lattice Field Theory — PoS(Lattice 2010)

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, where T pc is the pseudo-critical temperature. We find that the temperature dependence of the screening masses normalized by temperature, M 0 /T , shows notable structure around T pc , and approach 2π at high temperature in both channels, which is consistent with twice the thermal mass of a free quark in high temperature limit. The screening masses at low density are also investigated by using the Taylor expansion method with respect to the quark chemical potential. We find that the expansion coefficients in the leading order become positive in the temperature range, and thermal and density effect on the meson screening-masses becomes apparent in the quark-gluon plasma phase. The meson screening-masses are also compared with the gluon (Debye) screening masses at finite temperature and density.

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“…[8,9]. The RG-improved gauge action and the N f = 2 clover-improved Wilson quark action are adopted.…”

Section: Numerical Simulations For the Calculation Of The Chiral Condmentioning

confidence: 99%

Scaling behavior of chiral phase transition in two-flavor QCD with improved Wilson quarks at finite density

Ejiri¹

2011

Proceedings of the XXVIII International Symposium on Lattice Field Theory — PoS(Lattice 2010)

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We study scaling behavior of a chiral order parameter performing a simulation of two-flavor QCD with improved Wilson quarks. It has been shown that the scaling behavior of the chiral order parameter defined by a Ward-Takahashi identity agrees with the scaling function of the threedimensional O(4) spin model at zero chemical potential. We extend the scaling study to finite density QCD. Calculating derivatives of the chiral order parameter with respect to the chemical potential in two-flavor QCD, the scaling property of chiral phase transition is discussed in the low density region. We moreover calculate the curvature of the phase boundary of the chirl phase transition in the temperature and chemical potential plane assuming the O(4) scaling relation.

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Heavy-quark free energy, Debye mass, and spatial string tension at finite temperature in two flavor lattice QCD with Wilson quark action

Cited by 67 publications

References 40 publications

Equation of state and heavy-quark free energy at finite temperature and density in two flavor lattice QCD with Wilson quark action

Equation of state and heavy-quark free energy at finite temperature and density in two flavor lattice QCD with Wilson quark action

Hadron properties at finite temperature and density with two-flavors of Wilson fermion

Scaling behavior of chiral phase transition in two-flavor QCD with improved Wilson quarks at finite density

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