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124 results on '"Tago Y"'

1. Finite Temperature Gauge Theory on Anisotropic Lattices

Author

Fujisaki, M., Okuda, M., Tago, Y., Hashimoto, T., Hioki, S., Matsufuru, H., Miyamura, O., Nakamura, A., de Forcrand, Ph., Takaishi, T., Perez, M. Garcia, and Stamatescu, I. O.

Subjects
High Energy Physics - Lattice
Abstract

The finite temperature transition of QCD can be seen as a change in the structure of the hadrons and as a symmetry breaking transition -- a change in the structure of the vacuum. These phenomena are observed differently and carry complementary information. We aim at a correlated analysis involving hadronic correlators and the vacuum structure including field and density correlations, both non-trivial questions., Comment: 3 pages, Talk presented at LATTICE96(finite temperature)

Published
1996
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2. Search for Effective Lattice Action of Pure QCD

Author

deForcrand, Ph., Fujisaki, M., Hashimoto, T., Hioki, S., Matsufuru, H., Miyamura, O., Nakamura, A., Stamatescu, M. Okuda I. O., Tago, Y., and Takaishi, T.

Subjects
High Energy Physics - Lattice
Abstract

We study a coupling flow of pure QCD gauge system by using the Monte Carlo Renormalization Group method. A rough location of the renormalized trajectory in two coupling space is obtained. Also we compare 4 different actions; (a)standard Wilson, (b)Symanzik's, (c)Iwasaki's and (d)QCDTARO's. The rotational symmetry is restored better as an action gets close to the renormalized trajectory., Comment: 4 pages of A4 format plus 1 Postscript figure, (tar+gzip+uuencode) Talk presented at LATTICE96(poster)

Published
1996
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3. Systematic study of autocorrelation time in pure SU(3) lattice gauge theory

Author

Akemi, K., deForcrand, Ph., Fujisaki, M., Hashimoto, T., Hioki, S., Miyamura, O., Nakamura, A., Okuda, M., Stamatescu, I. O., Tago, Y., and Takaishi, T.

Subjects
High Energy Physics - Lattice
Abstract

Results of our autocorrelation measurement performed on Fujitsu AP1000 are reported. We analyze (i) typical autocorrelation time, (ii) optimal mixing ratio between overrelaxation and pseudo-heatbath and (iii) critical behavior of autocorrelation time around cross-over region with high statistic in wide range of $\beta$ for pure SU(3) lattice gauge theory on $8^4$, $16^4$ and $32^4$ lattices. For the mixing ratio K, small value (3-7) looks optimal in the confined region, and reduces the integrated autocorrelation time by a factor 2-4 compared to the pseudo-heatbath. On the other hand in the deconfined phase, correlation times are short, and overrelaxation does not seem to matter For a fixed value of K(=9 in this paper), the dynamical exponent of overrelaxation is consistent with 2 Autocorrelation measurement of the topological charge on $32^3 \times 64$ lattice at $\beta$ = 6.0 is also briefly mentioned., Comment: 3 pages of A4 format including 7-figures

Published
1993
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4. Scaling Study of Pure Gauge Lattice QCD by Monte Carlo Renormalization Group Method

Author

Akemi, K., deForcrand, Ph., Fujisaki, M., Hashimoto, T., Hege, H. C., Hioki, S., Miyamura, O., Nakamura, A., Stamatescu, M. Okuda I. O., Tago, Y., and Takaishi, T.

Subjects
High Energy Physics - Lattice
Abstract

The scaling behavior of pure gauge SU(3) in the region $\beta=5.85 - 7.60$ is examined by a Monte Carlo Renormalization Group analysis. The coupling shifts induced by factor 2 blocking are measured both on 32$^4$ and 16$^4$ lattices with high statistics. A systematic deviation from naive 2-loop scaling is clearly seen. The mean field and effective coupling constant schemes explain part, but not all of the deviation. It can be accounted for by a suitable change of coupling constant, including a correction term ${\cal O}(g^7)$ in the 2-loop lattice $\beta$-function. Based on this improvement, $\sqrt{\sigma}/\Lambda_{\overline {MS}}^{n_f=0}$ is estimated to be $2.2(\pm 0.1)$ from the analysis of the string tension $\sigma$., Comment: 4 pages of A4 format including 7-postscript figures

Published
1993
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5. Autocorrelation in Updating Pure SU(3) Lattice Gauge Theory by the use of Overrelaxed Algorithms

Author

Akemi, K., deForcrand, Ph., Fujisaki, M., Hashimoto, T., Hege, H. C., Hioki, S., Miyamura, O., Nakamura, A., Stamatescu, M. Okuda I. O., Tago, Y., and Takaishi, T.

Subjects
High Energy Physics - Lattice
Abstract

We measure the sweep-to-sweep autocorrelations of blocked loops below and above the deconfinement transition for SU(3) on a $16^4$ lattice using 20000-140000 Monte-Carlo updating sweeps. A divergence of the autocorrelation time toward the critical $\beta$ is seen at high blocking levels. The peak is near $\beta$ = 6.33 where we observe 440 $\pm$ 210 for the autocorrelation time of $1\times 1$ Wilson loop on $2^4$ blocked lattice. The mixing of 7 Brown-Woch overrelaxation steps followed by one pseudo-heat-bath step appears optimal to reduce the autocorrelation time below the critical $\beta$. Above the critical $\beta$, however, no clear difference between these two algorithms can be seen and the system decorrelates rather fast., Comment: 4 pages of A4 format including 6-figures

Published
1992
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8. Renormalization Group Flow of SU(3) Gauge Theory

Author

de Forcrand, P., Garcia Perez, M., Hashimoto, T., Hioki, S., Matsufuru, H., Miyamura, O., Nakamura, A., Stamatescu, I.O., Tago, Y., Takaishi, T., and Umeda, T.

Subjects
High Energy Physics::Lattice, Particle Physics - Lattice
Abstract

We calculate numerically the renormalization group (RG) flow of lattice QCD in two-coupling space, $(\beta_{1\times 1},\beta_{1\times 2})$. This is the first explicit calculation of the RG flow of SU(3) gauge theory. From the RG flow,a renormalized trajectory (RT) is revealed. Its behavior is consistent with the strong coupling expansion near the high-temperature fixed point. Actions with $(\beta_{1\times 1},\beta_{1\times 2})$ are studied; the lattice spacing is evaluated by measuring the string tension from the heavy quark potential. Recovery of the rotational symmetry is studied as a function of the ratio $\beta_{1\times 2} / \beta_{1\times 1}$. We calculate numerically the renormalization group (RG) flow of lattice QCD in two-coupling space, $(\beta_{1\times 1},\beta_{1\times 2})$. This is the first explicit calculation of the RG flow of SU(3) gauge theory. From the RG flow,a renormalized trajectory (RT) is revealed. Its behavior is consistent with the strong coupling expansion near the high-temperature fixed point. Actions with $(\beta_{1\times 1},\beta_{1\times 2})$ are studied; the lattice spacing is evaluated by measuring the string tension from the heavy quark potential. Recovery of the rotational symmetry is studied as a function of the ratio $\beta_{1\times 2} / \beta_{1\times 1}$.

Published
1998

12. Quest for More Information from Lattice QCD Simulations

Author

Collaboration, QCD-TARO, primary, Forcrand, Ph. de, additional, Pérez, M. Garcí a, additional, Hashimoto, T., additional, Hioki, S., additional, Matsufuru, H., additional, Miyamura, O., additional, Umeda, T., additional, Nakamura, A., additional, Stamatescu, I.-O., additional, Tago, Y., additional, and Takaishi, T., additional

Published
2000
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13. Finite temperature gauge theory on anisotropic lattices

Author

Fujisaki, M., primary, Okuda, M., additional, Tago, Y., additional, Hashimoto, T., additional, Hioki, S., additional, Matsufuru, H., additional, Miyamura, O., additional, Nakamura, A., additional, de Forcrand, Ph., additional, Takaishi, T., additional, García Pérez, M., additional, and Stamatescu, I.-O., additional

Published
1997
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14. Search for effective lattice action of pure QCD

Author

de Forcrand, Ph., primary, Fujisaki, M., additional, Hashimoto, T., additional, Hioki, S., additional, Matsufuru, H., additional, Miyamura, O., additional, Nakamura, A., additional, Okuda, M., additional, Stamatescu, I.-O., additional, Takaishi, T., additional, and Tago, Y., additional

Published
1997
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16. THE STRUCTURE OF MESONS NEAR Tc – THE QCD-TARO COLLABORATION –

Author

AKEMI, K., primary, FUJISAKI, M., additional, OKUDA, M., additional, TAGO, Y., additional, HASHIMOTO, T., additional, HIOKI, S., additional, MIYAMURA, O., additional, MATSUFURU, H., additional, NAKAMURA, A., additional, DE FORCRAND, PH., additional, STAMATESCU, I. O., additional, and TAKAISHI, T., additional

Published
1996
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17. An International Computer Experiment

Author

Akemi, K., primary, Fujisaki, M., additional, Okuda, M., additional, Tago, Y., additional, Hashimoto, T., additional, Hioki, S., additional, Miyamura, O., additional, Matsufuru, H., additional, Nakamura, A., additional, de Forcrand, Ph., additional, Stamatescu, I.- O., additional, and Takaishi, T., additional

Published
1996
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20. Analyzing finite temperature mesonic correlators

Author

Akemi, K., primary, Fujisaki, M., additional, Okuda, M., additional, Tago, Y., additional, Hashimoto, T., additional, Hioki, S., additional, Miyamura, O., additional, Nakamura, A., additional, de Forcrand, Ph., additional, Stamatescu, I.O., additional, and Takaishi, T., additional

Published
1995
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21. MCRG study and renormalized coupling constants

Author

Fujisaki, M., primary, Okuda, M., additional, Tago, Y., additional, de Forcrand, Ph., additional, Hashimoto, T., additional, Hioki, S., additional, Miyamura, O., additional, Nakamura, A., additional, Shoji, F., additional, Stamatescu, I.O., additional, and Takaishi, T., additional

Published
1995
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25. Hadron spectroscopy on a 323 × 48 lattice

Author

Akemi, K., primary, de Forcrand, Ph., additional, Fujisaki, M., additional, Hashimoto, T., additional, Hege, H.C., additional, Hioki, S., additional, Makino, J., additional, Miyamura, O., additional, Nakamura, A., additional, Okuda, M., additional, Stamatescu, I.O., additional, Tago, Y., additional, and Takaishi, T., additional

Published
1992
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26. QCD on the highly parallel computer AP1000

Author

Akemi, K., primary, de Forcrand, Ph., additional, Fujisaki, M., additional, Hashimoto, T., additional, Hege, H.C., additional, Hioki, S., additional, Makino, J., additional, Miyamura, O., additional, Nakamura, A., additional, Okuda, M., additional, Stamatescu, I.O., additional, Tago, Y., additional, and Takaishi, T., additional

Published
1992
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27. SU(3) renormalization group study on parallel computer AP1000

Author

Akemi, K., primary, de Forcrand, Ph., additional, Fujisaki, M., additional, Hashimoto, T., additional, Hege, H.C., additional, Hioki, S., additional, Makino, J., additional, Miyamura, O., additional, Nakamura, A., additional, Okada, M., additional, Stamatescu, I.O., additional, Tago, Y., additional, and Takaishi, T., additional

Published
1992
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28. QCD ON THE MASSIVELY PARALLEL COMPUTER APlOOO.

Author

Akemi, K., Fujisaki, M., Okuda, M., Tago, Y., Hashimoto, T., Hioki, S., Miyamura, O., Takaishi, T., Nakamura, A., de Forcrand, Ph., Hege, C., and Stamatescu, I. O.

Subjects
QUANTUM chromodynamics, PARALLEL computers, HADRONIC atoms, MIMD computers, COMPUTER simulation
Published
1993

29. THE STRUCTURE OF MESONS NEAR Tc - THE QCD-TARO COLLABORATION -.

Author

AKEMI, K., FUJISAKI, M., OKUDA, M., TAGO, Y., HASHIMOTO, T., HIOKI, S., MIYAMURA, O., MATSUFURU, H., NAKAMURA, A., DE FORCRAND, PH., STAMATESCU, I. O., and TAKAISHI, T.

Subjects
MESONS, QUANTUM chromodynamics, PIONS, QUARKS, GAUSSIAN distribution
Published
1996

30. Latitudinal variation in egg size and number in anadromous masu salmon Oncorhynchus masou.

Author

Morita, K., Tamate, T., Sugimoto, Y., Tago, Y., Watanabe, T., Konaka, H., Sato, M., Miyauchi, Y., Ohkuma, K., and Nagasawa, T.

Subjects
SALMON, FEMALES, LATITUDE, SPAWNING, MARINE biology
Abstract

Latitudinal variation in egg size and number in anadromous masu salmon Oncorhynchus masou was examined. Relatively greater variation in egg size occurred among rivers than among females within rivers or within females. Egg size was generally greater and egg number generally lower at more northerly latitudes. [ABSTRACT FROM AUTHOR]

Published
2009
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32. Coronary laser angioplasty with excimer laser

Author

Abe, Y., primary, Imanishi, K., additional, Yonezawa, T., additional, Chinzei, T., additional, Suzukawa, M., additional, Niwa, S., additional, Yotsuya, K., additional, Sogawa, I., additional, Uemiya, T., additional, Kanazawa, S., additional, Fujimasa, I., additional, Imachi, K., additional, Mabuchi, K., additional, Asano, M., additional, Tago, Y., additional, Kouno, A., additional, Ono, T., additional, and Atsumi, K., additional

Published
1988
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33. Laser angioplasry with contact ceramic tip

Author

Abe, Y., primary, Yonezawa, T., additional, Imanishi, K., additional, Chinzei, T., additional, Imachi, K., additional, Mabuchi, K., additional, Asano, M., additional, Fujimasa, I., additional, Tago, Y., additional, Kouno, A., additional, Ono, T., additional, and Atsumi, K., additional

Published
1988
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42. An International Computer Experiment: The QCD-TARO Collaboration

Author

Akemi, K., Fujisaki, M., Okuda, M., Tago, Y., Hashimoto, T., Hioki, S., Miyamura, O., Matsufuru, H., Nakamura, A., Forcrand, Ph. de, Stamatescu, I.- O., and Takaishi, T.

Abstract

We present the Japanese-European QCD-TARO collaboration. We discuss the hardware basis and the concept of analyses and present selected results. We comment on the chances and bottlenecks connected to the non-local, international character of the collaboration.

Published
2013
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43. Quest for More Information from Lattice QCD Simulations

Author

Collaboration, QCD-TARO, de Forcrand, Ph., Pérez, M. Garcí a, Hashimoto, T., Hioki, S., Matsufuru, H., Miyamura, O., Umeda, T., Nakamura, A., Stamatescu, I.-O., Tago, Y., and Takaishi, T.

Abstract

Lattice QCD is one of the most powerful tools to study the non-perturbative nature of the strong interaction. Although much information has been obtained so far to understand QCD, the computational cost becomes higher and higher as we calculate on finer lattices; simulations near the continuum are still far beyond. We report the progress on (1) renormalization group (RG) improved actions and (2) anisotropic lattice, which QCD-TARO group has developed and studied in order to get more information from the simulations on the present computers. RG improved actions were proposed and studied by Wilson and Iwasaki to remove discretization effects for long distance observables. We have studied 1×1 + 1×2 type actions, which includes Wilson, Symanzik and Iwasaki ones, by the strong and weak coupling expansions and Monte Carlo RG method. We have calculated RG flow and obtained a new effective β-function. Anisotropic lattice, where the temporal lattice spacing is smaller than that along the spatial one, makes us possible to perform finer resolution measurements in the temporal direction. This is especially useful at the finite temperature, where the temporal lattice size is limited. We have calculated meson pole and screening masses. We have found they behave in a different manner as a function of T.

Published
2013
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