Publications (213)483.8 Total impact

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ABSTRACT: Scattering lengths for two pseudoscalar meson systems, $\pi\pi(I=2)$, $KK(I=1)$ and $\pi K(I=3/2,\ 1/2)$, are calculated from lattice QCD by using the finite size formula. We perform the calculation with $N_f=2+1$ gauge configurations generated on $32^3 \times 64$ lattice using the Iwasaki gauge action and nonperturbatively ${\cal O}(a)$improved Wilson action at $a^{1} = 2.19$ GeV. The quark masses correspond to $m_\pi = 0.17  0.71$ GeV. For $\pi K(I=1/2)$ system, we use the variational method with the two operators, $\bar{s}u$ and $\pi K$, to separate the contamination from the higher states. In order to obtain the scattering length at the physical quark mass, we fit our results at the several quark masses with the formula of the ${\cal O}(p^4)$ chiral perturbation theory (ChPT) and that including the effects of the discretization error from the Wilson fermion, Wilson chiral perturbation theory (WChPT). We found that the mass dependence of our results near $m_\pi=0.17$ GeV are described well by WChPT but not by ChPT. The scattering lengths at the physical point are given as $a_0^{(2)} m_\pi =0.04263(22)(41)$, $a_0^{(1)} m_K =0.310(17)(32)$, $a_0^{(3/2)}\mu_{\pi K}=0.0469(24)(20)$ and $a_0^{(1/2)}\mu_{\pi K}=0.142(14)(27)$. Possible systematic errors are also discussed.Physical Review D 11/2013; 89(5). DOI:10.1103/PhysRevD.89.054502 · 4.86 Impact Factor 
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ABSTRACT: We present results of our trial calculation of the $K \to \pi\pi$ decay amplitudes with the improved Wilson fermion action. Calculations are carried out with $N_f=2+1$ gauge configurations generated with the Iwasaki gauge action and nonperturbatively $O(a)$improved Wilson fermion action at $a=0.091\,{\rm fm}$, $m_\pi=280\,{\rm MeV}$ and $m_K=560\,{\rm MeV} (\sim 2 m_\pi)$ on a $32^3\times 64$ ($La=2.9 {\rm fm}$) lattice. 
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ABSTRACT: We investigate the charmed baryon mass spectrum using the relativistic heavy quark action on 2+1 flavor PACSCS configurations previously generated on $32^3 \times 64$ lattice. The dynamical updown and strange quark masses are tuned to their physical values, reweighted from those employed in the configuration generation. At the physical point, the inverse lattice spacing determined from the $\Omega$ baryon mass gives $a^{1}=2.194(10)$ GeV, and thus the spatial extent becomes $L = 32 a = 2.88(1)$ fm. Our results for the charmed baryon masses are consistent with experimental values, except for the mass of $\Xi_{cc}$, which has been measured by only one experimental group so far and has not been confirmed yet by others. In addition, we report values of other doubly and triply charmed baryon masses, which have never been measured experimentally.Physical review D: Particles and fields 01/2013; 87(9). DOI:10.1103/PhysRevD.87.094512 · 4.86 Impact Factor 
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ABSTRACT: We review the work of the PACSCS Collaboration, which aimed to realize lattice quantum chromodynamics (QCD) calculations at the physical point, i.e., those with quark masses set at physical values. This has been a longterm goal of lattice QCD simulation since its inception in 1979. After reviewing the algorithmic progress, which played a key role in this development, we summarize the simulations that explored the quark mass dependence of hadron masses down to values close to the physical point. In addition to allowing a reliable determination of the light hadron mass spectrum, this work provided clues on the validity range of chiral perturbation theory, which is widely used in phenomenology. We then describe the application of the technique of quark determinant reweighting, which enables lattice QCD calculations exactly on the physical point. The physical quark masses and the strong coupling constants are fundamental constants of the strong interaction. We describe a nonperturbative Schrodinger functional approach to figure out the nonperturbative renormalization needed to calculate them. There are a number of physical applications that can benefit from lattice QCD calculations carried out either near or at the physical point. We take up three illustrative examples: calculation of the physical properties of the rho meson as a resonance, the electromagnetic form factor and charge radius of the pion, and charmed meson spectroscopy. Bringing single hadron properties under control opens up a number of new areas for serious lattice QCD research. One such area is electromagnetic effects in hadronic properties. We discuss the combined QCD plus QED simulation strategy and present results on electromagnetic mass difference. Another area is multihadron states, or nuclei. We discuss the motivations and difficulties in this area, and describe our work for deuteron and helium as our initial playground. We conclude with a brief discussion on the future perspective of lattice QCD.08/2012; DOI:10.1093/ptep/pts002 
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ABSTRACT: We present the results of 1+1+1 flavor QCD+QED simulation at the physical point, in which the dynamical quark effects in QED and the updown quark mass difference are incorporated by the reweighting technique. The physical quark masses together with the lattice spacing are determined with $m_{\pi^+}$, $m_{K^+}$, $m_{K^0}$ and $m_{\Omega^}$ as physical inputs. Calculations are carried out using a set of 2+1 flavor QCD configurations near the physical point generated by the nonperturbatively $O(a)$improved Wilson quark action and the Iwasaki gauge action at $\beta=1.9$ on a $32^3\times 64$ lattice. We evaluate the values of the up, down and strange quark masses individually with nonperturbative QCD renormalization.Physical review D: Particles and fields 05/2012; 86(3). DOI:10.1103/PhysRevD.86.034507 · 4.86 Impact Factor 
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ABSTRACT: We perform a lattice QCD study of the $\rho$ meson decay from the $N_f=2+1$ full QCD configurations generated with a renormalization group improved gauge action and a nonperturbatively $O(a)$improved Wilson fermion action. The resonance parameters, the effective $\rho\to\pi\pi$ coupling constant and the resonance mass, are estimated from the $P$wave scattering phase shift for the isospin I=1 twopion system. The finite size formulas are employed to calculate the phase shift from the energy on the lattice. Our calculations are carried out at two quark masses, $m_\pi=410\,{\rm MeV}$ ($m_\pi/m_\rho=0.46$) and $m_\pi=300\,{\rm MeV}$ ($m_\pi/m_\rho=0.35$), on a $32^3\times 64$ ($La=2.9\,{\rm fm}$) lattice at the lattice spacing $a=0.091\,{\rm fm}$. We compare our results at these two quark masses with those given in the previous works using $N_f=2$ full QCD configurations and the experiment. 
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ABSTRACT: We perform a lattice QCD study of the $\rho$ meson decay from the $N_f=2+1$ full QCD configurations generated with a renormalization group improved gauge action and a nonperturbatively $O(a)$improved Wilson fermion action. The resonance parameters, the effective $\rho\to\pi\pi$ coupling constant and the resonance mass, are estimated from the $P$wave scattering phase shift for the isospin I=1 twopion system. The finite size formulas are employed to calculate the phase shift from the energy on the lattice. Our calculations are carried out at two quark masses, $m_\pi=410\,{\rm MeV}$ ($m_\pi/m_\rho=0.46$) and $m_\pi=300\,{\rm MeV}$ ($m_\pi/m_\rho=0.35$), on a $32^3\times 64$ ($La=2.9\,{\rm fm}$) lattice at the lattice spacing $a=0.091\,{\rm fm}$. We compare our results at these two quark masses with those given in the previous works using $N_f=2$ full QCD configurations and the experiment.Physical review D: Particles and fields 06/2011; 84. DOI:10.1103/PhysRevD.84.094505 · 4.86 Impact Factor 
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ABSTRACT: We investigate the charm quark system using the relativistic heavy quark action on 2+1 flavor PACSCS configurations previously generated on $32^3 \times 64$ lattice. The dynamical updown and strange quark masses are set to the physical values by using the technique of reweighting to shift the quark hopping parameters from the values employed in the configuration generation. At the physical point, the lattice spacing equals $a^{1}=2.194(10)$ GeV and the spatial extent $L=2.88(1)$ fm. The charm quark mass is determined by the spinaveraged mass of the 1S charmonium state, from which we obtain $m_{\rm charm}^{\msbar}(\mu = m_{\rm charm}^{\msbar}) = 1.260(1)(6)(35)$ GeV, where the errors are due to our statistics, scale determination and renormalization factor. An additional systematic error from the heavy quark is of order $\alpha_s^2 f(m_Q a)(a \Lambda_{QCD})$, which is estimated to be a percent level if the factor $f(m_Q a)$ analytic in $m_Q a$ is of order unity. Our results for the charmed and charmedstrange meson decay constants are $f_D=226(6)(1)(5)$ MeV, $f_{D_s}=257(2)(1)(5)$ MeV, again up to the heavy quark errors of order $\alpha_s^2 f(m_Q a)(a \Lambda_{QCD})$. Combined with the CLEO values for the leptonic decay widths, these values yield $V_{cd} = 0.205(6)(1)(5)(9)$, $V_{cs} = 1.00(1)(1)(3)(3)$, where the last error is on account of the experimental uncertainty of the decay widths.Physical review D: Particles and fields 04/2011; 84(7). DOI:10.1103/PhysRevD.84.074505 · 4.86 Impact Factor 
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ABSTRACT: We present preliminary results on the $\rho$ meson decay width from $N_f=2+1$ full QCD configurations generated by PACSCS Collaboration. The decay width is estimated from the $P$wave scattering phase shift for the isospin $I=1$ twopion system. The finite size formula presented by L\"uscher in the center of mass frame and its extension to nonzero total momentum frame by Rummukainen and Gottlieb are employed for the calculations of the phase shift. Our calculations are carried out at $m_\pi=410\ {\rm MeV}$ ($m_\pi/m_\rho=0.46$) and $a=0.091\ {\rm fm}$ on a $32^3\times 64$ ($La=2.9 {\rm fm}$) lattice. 
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ABSTRACT: We present an evaluation of the quark mass renormalization factor for N f = 2 + 1 QCD. The Schrödinger functional scheme is employed as the intermediate scheme to carry out nonperturbative running from the low energy region, where renormalization of bare mass is performed on the lattice, to deep in the high energy perturbative region, where the conversion to the renormalization group invariant mass or the scheme is safely carried out. For numerical simulations we adopted the Iwasaki gauge action and nonperturbatively improved Wilson fermion action with the clover term. Seven renormalization scales are used to cover from low to high energy regions and three lattice spacings to take the continuum limit at each scale. The regularization independent step scaling function of the quark mass for the N f = 2 + 1 QCD is obtained in the continuum limit. Renormalization factors for the pseudo scalar density and the axial vector current are also evaluated for the same action and the bare couplings as two recent large scale N f = 2 + 1 simulations; previous work of the CP PACS/JLQCD collaboration, which covered the updown quark mass range heavier than m π ∼ 500 MeV and that of PACSCS collaboration for much lighter quark masses down to m π = 155MeV. The quark mass renormalization factor is used to renormalize bare PCAC masses in these simulations.Journal of High Energy Physics 06/2010; 2010(8):127. DOI:10.1007/JHEP08(2010)101 · 6.22 Impact Factor 
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ABSTRACT: We present the results of the physical point simulation in 2+1 flavor lattice QCD with the nonperturbatively $O(a)$improved Wilson quark action and the Iwasaki gauge action at $\beta=1.9$ on a $32^3 \times 64$ lattice. The physical quark masses together with the lattice spacing is determined with $m_\pi$, $m_K$ and $m_\Omega$ as physical inputs. There are two key algorithmic ingredients to make possible the direct simulation at the physical point: One is the masspreconditioned domaindecomposed HMC algorithm to reduce the computational cost. The other is the reweighting technique to adjust the hopping parameters exactly to the physical point. The physics results include the hadron spectrum, the quark masses and the pseudoscalar meson decay constants. The renormalization factors are nonperturbatively evaluated with the Schr{\"o}dinger functional method. The results are compared with the previous ones obtained by the chiral extrapolation method. Comment: 20 pages, 17 figures, version to appear in Phys. Rev. DPhysical Review D 11/2009; 81(7). DOI:10.1103/PhysRevD.81.074503 · 4.86 Impact Factor 
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ABSTRACT: The $S$wave $\pi K$ scattering lengths are calculated for both the isospin 1/2 and 3/2 channels in the lattice QCD by using the finite size formula. We perform the calculation with $N_f=2+1$ gauge configurations generated on $32^3 \times 64$ lattice using the Iwasaki gauge action and nonperturbatively $O(a)$improved Wilson action at $1/a = 2.17$ GeV. The quark masses correspond to $m_\pi = 0.30  0.70$ GeV. For $I=1/2$, to separate the contamination from excited states, we construct a $2 \times 2$ matrix of the time correlation function and diagonalize it. Here, we adopt the two kinds of operators, $\bar{s}u$ and $\pi K$. It is found that the signs of the scattering lengths are in agreement with experiment, namely attraction in $I=1/2$ and repulsion in $I=3/2$. We investigate the quarkmass dependence of the scattering lengths and also discuss the limitation of chiral perturbation theory. Comment: 7 pages, 3 figures, Talk presented at Lattice2009, Peking University, Beijing, China 
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ABSTRACT: We present an evaluation of the running coupling constant for Nf = 2+1 QCD. The Schrödinger functional scheme is used as the intermediate scheme to carry out nonperturbative running from the low energy region, where physical scale is introduced, to deep in the high energy perturbative region, where conversion to the scheme is safely performed. Possible systematic errors due to the use of perturbation theory occur only in the conversion from threeflavor to fourflavor running coupling constant near the charm mass threshold, where higher order terms beyond 5th order in the β function may not be negligible. For numerical simulations we adopted Iwasaki gauge action and nonperturbatively improved Wilson fermion action with the clover term. Seven renormalization scales are used to cover from low to high energy region and three lattice spacings to take the continuum limit at each scale. A physical scale is introduced from the previous Nf = 2+1 simulation of the CPPACS/JLQCD collaboration [1], which covered the updown quark mass range heavier than mπ ~ 500 MeV. Our final result is = 0.12047(81)(48)(+0−173) and = 239(10)(6)(+0−22) MeV .Journal of High Energy Physics 10/2009; 2009(10):053. DOI:10.1088/11266708/2009/10/053 · 5.62 Impact Factor 
Article: SU(2) and SU(3) chiral perturbation theory analyses on baryon masses in 2+1 flavor lattice QCD
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ABSTRACT: We investigate the quark mass dependence of baryon masses in 2+1 flavor lattice QCD using SU(3) heavy baryon chiral perturbation theory up to oneloop order. The baryon mass data used for the analyses are obtained for the degenerate updown quark mass of 3 MeV to 24 MeV and two choices of the strange quark mass around the physical value. We find that the SU(3) chiral expansion fails to describe both the octet and the decuplet baryon data if phenomenological values are employed for the mesonbaryon couplings. The SU(2) case is also examined for the nucleon. We observe that higher order terms are controlled only around the physical point. We also evaluate finite size effects using SU(3) heavy baryon chiralperturbation theory, finding small values of order 1% even at the physical point. Comment: 26 pages, 10 tables, 58 figuresPhysical review D: Particles and fields 05/2009; 80(5). DOI:10.1103/PhysRevD.80.054502 · 4.86 Impact Factor 
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ABSTRACT: I present derivation of L\"uscher's finite size formula for the elastic $N\pi$ and the $NN$ scattering system for several angular momenta from the relativistic quantum field theory. 
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ABSTRACT: We study heavyheavy and heavylight quark systems for charm with a relativistic heavy quark action in 2+1 flavor lattice QCD. Configurations are generated by the PACSCS Collaboration at the lattice spacing is $a=0.09$ fm with the lattice size of $32^3\times 64$ employing the $O(a)$improved Wilson quark action and the Iwasaki gauge action. We present preliminary results for the charmonium spectrum and the $D$ and $D_s$ meson decay constants evaluated at 3.5 MeV$< m_{\rm ud}<$ 12 MeV with $m_{\rm s}$ around the physical value. We investigate the dynamical quark mass dependences of the hyperfine and the orbital splittings. The decay constants are compared with the recent experimental values. 
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ABSTRACT: We present simulation details and results for the light hadron spectrum in N f = 2 + 1 lattice QCD with the nonperturbatively O(a)improved Wilson quark action and the Iwasaki gauge action. Simulations are carried out at a lattice spacing of 0.09 fm on a (2.9fm)^3 box using the PACSCS computer. We employ the Luscher's domaindecomposed HMC algorithm with several improvements to reduce the degenerate updown quark mass toward the physical value. So far the resulting pseudoscalar meson mass is ranging from 702MeV down to 156MeV. We discuss on the stability and the efficiency of the algorithm. The light harden spectrum extrapolated at the physical point is compared with the experimental values. We also present the values of the quark masses and the pseudoscalar meson decay constants. 
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ABSTRACT: We investigate the quark mass dependence of meson and baryon masses obtained from 2+1 flavor dynamical quark simulations performed by the PACSCS Collaboration. With the use of SU(2) and SU(3) chiral perturbation theories up to NLO, we examine the chiral behavior of the pseudoscalar meson masses and the decay constants in terms of the degenerate updown quark mass ranging form 3 MeV to 24 MeV and two choices of the strange quark mass around the physical value. We discuss the convergence of the SU(2) and SU(3) chiral expansions and present the results for the low energy constants. We find that the SU(3) expansion is not convergent at NLO for the physical strange quark mass. The chiral behavior of the nucleon mass is also discussed based on the SU(2) heavy baryon chiral perturbation theory up to NNLO. Our results show that the expansion is well behaved only up to m_pi^2 ~ 0.2 GeV^2. Comment: 7 Pages, 8 figures, talk presented at the XXVI International Symposium on Lattice Field Theory, July 1419, 2008, Williamsburg, Virginia, USA 
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ABSTRACT: We present the first results of the PACSCS project which aims to simulate 2+1 flavor lattice QCD on the physical point with the nonperturbatively $O(a)$improved Wilson quark action and the Iwasaki gauge action. Numerical simulations are carried out at the lattice spacing of $a=0.0907(13)$fm on a $32^3\times 64$ lattice with the use of the DDHMC algorithm to reduce the updown quark mass. Further algorithmic improvements make possible the simulation whose ud quark mass is as light as the physical value. The resulting PS meson masses range from 702MeV down to 156MeV, which clearly exhibit the presence of chiral logarithms. An analysis of the PS meson sector with SU(3) ChPT reveals that the NLO corrections are large at the physical strange quark mass. In order to estimate the physical ud quark mass, we employ the SU(2) chiral analysis expanding the strange quark contributions analytically around the physical strange quark mass. The SU(2) LECs ${\bar l}_3$ and ${\bar l}_4$ are comparable with the recent estimates by other lattice QCD calculations. We determine the physical point together with the lattice spacing employing $m_\pi$, $m_K$ and $m_\Omega$ as input. The hadron spectrum extrapolated to the physical point shows an agreement with the experimental values at a few % level of statistical errors, albeit there remain possible cutoff effects. We also find that our results of $f_\pi=134.0(4.2)$MeV, $f_K=159.4(3.1)$MeV and $f_K/f_\pi=1.189(20)$ with the perturbative renormalization factors are compatible with the experimental values. For the physical quark masses we obtain $m_{\rm ud}^\msbar=2.527(47)$MeV and $m_{\rm s}^\msbar=72.72(78)$MeV extracted from the axialvector WardTakahashi identity with the perturbative renormalization factors. Comment: 43 pages, 48 figuresPhysical Review D 07/2008; 79(3). DOI:10.1103/PhysRevD.79.034503 · 4.86 Impact Factor 
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ABSTRACT: We calculate a twopion wave function for the I=2 Swave twopion system with a finite scattering momentum and estimate the interaction range between two pions, which allows us to examine the validity of a necessary condition for the finite size formula presented by Rummukainen and Gottlieb. We work in the quenched approximation employing the plaquette gauge action for gluons and the improved Wilson action for quarks at 1/a=1.63 GeV on the 323×120 lattice. The quark masses are chosen to give mpi=0.420, 0.488, and 0.587 GeV. We find that the energy dependence of the interaction range is small and the necessary condition is satisfied for our range of the quark mass and the scattering momentum, k<=0.16 GeV. We also find that the scattering phase shift can be obtained with a smaller statistical error from the twopion wave function than from the twopion time correlator.Physical review D: Particles and fields 05/2008; 78(1). DOI:10.1103/PHYSREVD.78.014511 · 4.86 Impact Factor
Publication Stats
4k  Citations  
483.80  Total Impact Points  
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Institutions

1993–2013

University of Tsukuba
 Centre for Computational Sciences
Tsukuba, Ibaraki, Japan


1995–1996

Washington University in St. Louis
 Department of Physics
Saint Louis, MO, United States
