Light hadron spectrum in 2+1 flavor full QCD by CP-PACS and JLQCD Collaborations

Ishikawa, Takeshi; Aoki, Sinya; Fukugita, M.; Hashimoto, S.; Ishikawa, Ken-ichi; Ishizuka, N.; Iwasaki, Y.; Kanaya, K.; Kaneko, T.; Kuramashi, Y.; Okawa, M.; Onogi, Tetsuya; Taniguchi, N.; Tsutsui, N.; Ukawa, A.; Yoshié, T.

doi:10.1016/j.nuclphysbps.2004.11.142

Cited by 27 publications

(28 citation statements)

References 13 publications

(16 reference statements)

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“…Moreover we can employ the N f = 2 and 2+1 flavor dynamical configurations already generated with the clover quark action at several sea quark masses and lattice spacings [23,24,25] in future studies. We calculate the EDM on the same 16 3 ×32 configurations, using the clover fermion with c SW = 1.340, the tadpole improved value of the clover coefficient determined from…”

Section: Simulation Details a Simulation Parametersmentioning

confidence: 99%

Neutron electric dipole moment with external electric field method in lattice QCD

et al. 2007

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We discuss a possibility that the Neutron Electric Dipole Moment (NEDM) can be calculated in lattice QCD simulations in the presence of the CP violating θ term. In this paper we measure the energy difference between spin-up and spin-down states of the neutron in the presence of an uniform and static external electric field. We first test this method in quenched QCD with the RG improved gauge action on a 16 3 ×32 lattice at a −1 ≃ 2 GeV, employing two different lattice fermion formulations, the domain-wall fermion and the clover fermion for quarks, at relatively heavy quark mass (m P S /m V ≃ 0.85). We obtain non-zero values of NEDM from calculations with both fermion formulations. We next consider some systematic uncertainties of our method for NEDM, using 24 3 × 32 lattice at the same lattice spacing only with the clover fermion. We finally investigate the quark mass dependence of NEDM and observe a non-vanishing behavior of NEDM toward the chiral limit. We interpret this behavior as a manifestation of the pathology in the quenched approximation.

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Section: Simulation Details a Simulation Parametersmentioning

confidence: 99%

Neutron electric dipole moment with external electric field method in lattice QCD

et al. 2007

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“…In particular, ground state hadron masses in the quenched approximation agree with the experimental values in 10% accuracy [1]. Furthermore unquenching of the dynamical quarks tends to improve the agreement [2]. On the other hand, studies of the excited hadrons are still in an exploratory stage in spite of their physical importance.…”

Section: Introductionmentioning

confidence: 98%

Spectral analysis of excited nucleons in lattice QCD with maximum entropy method

Sasaki

Hatsuda

2005

Physics Letters B

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We study the mass spectra of excited baryons with the use of the lattice QCD simulations. We focus our attention on the problem of the level ordering between the positive-parity excited state N ′ (1440) (the Roper resonance) and the negative-parity excited state N * (1535). Nearly perfect parity projection is accomplished by combining the quark propagators with periodic and anti-periodic boundary conditions in the temporal direction. Then we extract the spectral functions from the lattice data by utilizing the maximum entropy method. We observe that the masses of the N ′ and N * states are close for wide range of the quark masses (M π = 0.61 − 1.22 GeV), which is in contrast to the phenomenological prediction of the quark models. The role of the Wilson doublers in the baryonic spectral functions is also studied.

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“…We use (2+ 1)-flavor QCD configurations generated for Refs. [11,12] with non-perturbatively O(a)-improved Wilson quarks and Iwasaki glue [13]. Our gauge coupling β = 2.05 corresponds to a = 0.0701(29) fm, and our hopping parameters correspond to m π /m ρ ≃ 0.63 and m η ss /m φ ≃ 0.74.…”

Section: Introductionmentioning

confidence: 99%

Equation of state in (2+1)-flavor QCD with gradient flow

Kanaya

Ejiri

Iwami

et al. 2017

Proceedings of 34th Annual International Symposium on Lattice Field Theory — PoS(LATTICE2016)

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The energy-momentum tensor and equation of state are studied in finite-temperature (2+1)-flavor QCD with improved Wilson quarks using the method proposed by Makino and Suzuki based on the gradient flow. We find that the results of the gradient flow are consistent with the previous results using the T -integration method at T < ∼ 280 MeV (N t > ∼ 10), while a disagreement is found at T > ∼ 350 MeV (N t < ∼ 8) presumably due to the small-N t lattice artifact. We also report on the results on the renormalized chiral condensate and its disconnected susceptibility using the method of Hieda and Suzuki. The results show a clear signal of the expected chiral restoration crossover even with Wilson-type quarks which violate the chiral symmetry explicitly. 34th annual International Symposium on Lattice Field Theory

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Light hadron spectrum in 2+1 flavor full QCD by CP-PACS and JLQCD Collaborations

Abstract: CP-PACS and JLQCD collaborations are carrying out a joint project of the 2+1 flavor full QCD simulation. Gauge configurations are generated for the non-perturbatively O(a)-improved Wilson quark action and the Iwasaki gauge action using PHMC algorithm at three lattice spacings, a ∼

Cited by 27 publications

References 13 publications

Neutron electric dipole moment with external electric field method in lattice QCD

Neutron electric dipole moment with external electric field method in lattice QCD

Spectral analysis of excited nucleons in lattice QCD with maximum entropy method

Equation of state in (2+1)-flavor QCD with gradient flow

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