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1. Progress and status of APEmille

Author

APE collaboration, Bartoloni, A., Cabasino, S., Cabibbo, N., Cosimi, M., De Riso, P., Errico, W., Giovannetti, S., Laico, F., Leich, H., Lonardo, A., Magazzu, G., Michelotti, A., Panizzi, E., Paolucci, P. S., Rossetti, D., Schwendicke, U., Simma, H., Sulanke, K. H., Torelli, M., Tripiccione, R., and Vicini, P.

Subjects
High Energy Physics - Lattice
Abstract

We report on the progress and status of the APEmille project: a SIMD parallel computer with a peak performance in the TeraFlops range which is now in an advanced development phase. We discuss the hardware and software architecture, and present some performance estimates for Lattice Gauge Theory (LGT) applications., Comment: Talk presented at LATTICE97, 3 pages, Latex

Published
1997
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2. Quenched $B_K$-parameter with the Wilson and Clover actions at $\beta = 6.0$

Author

Crisafulli, M., Donini, A., Lubicz, V., Martinelli, G., Rapuano, F., Ungarelli, C., Vladikas, A., Collaboration, the APE, Bartoloni, A., Battista, C., Cabasino, S., Cabibbo, N., Marzano, F., Panizzi, E., Paolucci, P. S., Sarno, R., Todesco, G. M., Torelli, M., and Vicini, P.

Subjects
High Energy Physics - Lattice
Abstract

We present results for the Kaon $B$ parameter from a sample of $200$ configurations using the Wilson action and $460$ configurations using the Clover action, on a $18^3 \times 64$ lattice at $\beta=6.0$. A slight improvement of the chiral behaviour of $B_K$ is observed due to the Clover action. We have also compared the results for $B_K$ obtained from two different procedures for the boosting of the coupling constant $g$. We observe a strong dependence of $B_K$ on the prescription adopted for $g$ in the Wilson case, contrary to the results of the Clover case which are almost unaffected by the choice of $g$. Combining some recently obtained non perturbative estimates for the renormalisation constants with our Clover matrix element, we observe a significant improvement in the chiral behaviour of $B_K$., Comment: 3 pages, Latex, Postscript file with figures available at ftp://hpteo.roma1.infn.it/pub/preprints/lat94/donini ; to appear in Lattice '94, Nucl. Phys. (Proc.Suppl.)

Published
1995
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3. APE Results of Hadron Masses in Full QCD Simulations

Author

Antonelli, S., Bartoloni, A., Battista, C., Bellacci, M., Cabasino, S., Cabibbo, N., Fernandez, L. A., Panizzi, E., Paolucci, P. S., Munoz-Sudupe, A., Ruiz-Lorenzo, J. J., Sarno, R., Tarancon, A., Todesco, G. M., Torelli, M., and Vicini, P.

Subjects
High Energy Physics - Lattice
Abstract

We present numerical results obtained in full QCD with 2 flavors of Wilson fermions. We discuss the relation between the phase of Polyakov loops and the {\bf sea} quarks boundary conditions. We report preliminary results about the HMC autocorrelation of the hadronic masses, on a $16^3 \times 32$ lattice volume, at $\beta=5.55$ with $k_{sea}=0.1570$., Comment: 3 pages, compressed ps-file (uufiles), Contribution to Lattice 94

Published
1994
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4. Lattice Calculation of D- and B-meson Semileptonic Decays, using the Clover Action at beta=6.0 on APE

Author

Allton, C. R., Crisafulli, M., Lubicz, V., Martinelli, G., Rapuano, F., Stella, N., Vladikas, A., Bartoloni, A., Battista, C., Cabasino, S., Cabibbo, N., Panizzi, E., Paolucci, P. S., Sarno, R., Todesco, G. M., Torelli, M., and Vicini, P.

Subjects
High Energy Physics - Lattice
Abstract

We present the results of a high statistics lattice calculation of hadronic form factors relevant for $D-$ and $B-$meson semi-leptonic decays into light pseudoscalar and vector mesons. The results have been obtained by averaging over 170 gauge field configurations, generated in the quenched approximation, at $\beta=6.0$, on a $18^3 \times 64$ lattice, using the $O(a)$-improved SW-Clover action.From the study of the matrix element $$, we obtain $f_+ (0)=0.78\pm 0.08$ and from the matrix element $<\bar K^{* 0}\vert J_\mu \vert D^+>$ we obtain $V(0)=1.08\pm 0.22$, $A_1(0)=0.67\pm 0.11$ and $A_2(0)=0.49\pm 0.34$. We also obtain the ratios $V(0)/A_1(0)=1.6\pm 0.3$ and $A_2(0)/A_1(0)= 0.7\pm 0.4$. Our predictions for the different form factors are in good agreement with the experimental data, although, in the case of $A_2(0)$, the errors are still too large to draw any firm conclusion. With the help of the Heavy Quark Effective Theory (HQET) we have also extrapolated the lattice results to $B$-meson decays. The form factors follow a behaviour compatible with the HQET predictions. Our results are in agreement with a previous lattice calculation, performed at $\beta=6.4$, using the standard Wilson action., Comment: LaTeX, 15 pages, postscript figures attached uuencoded

Published
1994
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5. Polyakov Loops and Finite-Size Effects of Hadron Masses in Lattice Full Q.C.D

Author

Antonelli, S., Bellacci, M., Fernández, L. A., Muñoz-Sudupe, A., Ruiz-Lorenzo, J. J., Sarno, R., Tarancón, A., Bartoloni, A., Battista, C., Cabibbo, N., Cabasino, S., Panizzi, E., Paolucci, P. S., Todesco, G. M., Torelli, M., Tripiccione, R., and Vicini, P.

Subjects
High Energy Physics - Lattice
Abstract

The polarization of Polyakov type loops is responsible for the difference between quenched and unquenched finite size effects on the QCD mass spectrum. With a numerical simulation, using different sea quarks boundary conditions, we show that we can align the spatial Polyakov loops in a predefined direction. Starting from these results, we propose a procedure to partially remove the Polyakov type contributions in the meson propagators., Comment: (6 pages latex). 4 postscript figures availables via anonymous ftp to 141.108.5.193 . Preprint Rome 94/1013

Published
1994
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6. A High Statistics Lattice Calculation of $f^{static}_B$ at $\beta=6.2$ Using the Clover Action

Author

Allton, C. R., Crisafulli, M., Lubicz, V., Salina, G., Martinelli, G., Vladikas, A., Bartoloni, A., Battista, C., Cabasino, S., Cabibbo, N., Marzano, F., Paolucci, P. S., Pech, J., Rapuano, F., Sarno, R., Todesco, G. M., Torelli, M., Tross, W., Vicini, P., and Collaboration, The APE

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Lattice
Abstract

We present a calculation of $f_B$ in the static limit, obtained by numerical simulation of quenched QCD, at $\beta=6.2$ on a $18^3 \times 64$ lattice, using the SW-Clover quark action. The decay constant has been extracted by studying heavy(static)-light correlation functions of different smeared operators, on a sample of 220 gauge field configurations. We have obtained $f_B^{static}=(290 \pm 15 \pm 45)$ MeV, where the first error comes from the uncertainty in the determination of the matrix element and the second comes from the uncertainty in the lattice spacing. We also obtain $M_{B_s}-M_{B_d}= (70 \pm 10)$ MeV and $f^{stat}_{B_s}/f^{stat}_{B_d}=1.11(3)$. A comparison of our results with other calculations of the same quantity is made., Comment: 12 pages, LaTex, 3 figs. (figures not included; available upon request from lubicz@roma1.infn.it) ROME prep. 94/981, 18 February 1994

Published
1994
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7. The Teraflop parallel computer APEmille

Author

Aglietti, F., Bartoloni, A., Battista, C., Cabasino, S., Cosimi, M., Michelotti, A., Monello, A., Panizzi, E., Paolucci, P. S., Rinaldi, W., Rossetti, D., Simma, H., Torelli, M., Vicini, P., Cabibbo, N., Centurioni, E., Errico, W., Laico, F., Magazzù, G., Tripiccione, R., Goos, Gerhard, editor, Hartmanis, Juris, editor, van Leeuwen, Jan, editor, Hertzberger, Bob, editor, and Sloot, Peter, editor

Published
1997
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8. The Teraflop parallel computer APEmille

Author

Aglietti, F., primary, Bartoloni, A., additional, Battista, C., additional, Cabasino, S., additional, Cosimi, M., additional, Michelotti, A., additional, Monello, A., additional, Panizzi, E., additional, Paolucci, P. S., additional, Rinaldi, W., additional, Rossetti, D., additional, Simma, H., additional, Torelli, M., additional, Vicini, P., additional, Cabibbo, N., additional, Centurioni, E., additional, Errico, W., additional, Laico, F., additional, Magazzù, G., additional, and Tripiccione, R., additional

Published
1997
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9. THE APE COMPUTER: AN ARRAY PROCESSOR OPTIMIZED FOR LATTICE GAUGE THEORY SIMULATIONS

Author

ALBANESE, M., primary, BACILIERI, P., additional, CABASINO, S., additional, CABIBBO, N., additional, COSTANTINI, F., additional, FIORENTINI, G., additional, FLORE, F., additional, FONTI, L., additional, FUCCI, A., additional, LOMBARDO, M. P., additional, GALEOTTI, S., additional, GIACOMELLI, P., additional, MARCHESINI, P., additional, MARINARI, E., additional, MARZANO, F., additional, MIOTTO, A., additional, PAOLUCCI, P., additional, PARISI, G., additional, PASCOLI, D., additional, PASSUELLO, D., additional, PETRARCA, S., additional, RAPUANO, F., additional, REMIDDI, E., additional, RUSACK, R., additional, SALINA, G., additional, and TRIPICCIONE, R., additional

Published
1992
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10. B -> K* gamma decay on APE

Author

Abada, A., Boucaud, Philippe, Crisafulli, M., Leroy, J.P., Lubicz, V., Martinelli, G., Rapuano, F., Serone, M., Stella, N., Bartoloni, A., Battista, C., Cabasino, S., Cabibbo, N., Panizzi, E., Paolucci, P.S., Sarno, R., Todesco, G.M., Torelli, M., Vicini, P., Abada, A, Boucaud, P, Crisafulli, M, Leroy, Jp, Lubicz, Vittorio, Martinelli, G, Rapuano, F, Serone, M, Stella, N, Bartoloni, A, Battista, C, Cabasino, S, Cabibbo, N, Panizzi, E, Paolucci, P, Sarno, R, Todesco, Gm, Torelli, M, and Vicini

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

We present results for the radiative decay B\rightarrow K^* \gamma, obtained by using the Clover action at \beta = 6.0 on APE. The compatibility between the scaling laws predicted by the Heavy Quark Effective Theory (HQET) and pole dominance is discussed. The final result depends crucially on the assumed q^2-dependence of the form factors.

Published
1995

11. Quenched BK-parameter with the Wilson and Clover actions at beta=6.0

Author

Crisafulli M, Donini A, Martinelli G, Rapuano F, Ungarelli C, Vladikas A, Bartoloni A, Battista C, Cabasino S, Cabibbo N, Marzano F, Panizzi E, Paolucci PS, Sarno R, Todesco GM, Torelli M, Vicini P., LUBICZ, Vittorio, Crisafulli, M, Donini, A, Lubicz, Vittorio, Martinelli, G, Rapuano, F, Ungarelli, C, Vladikas, A, Bartoloni, A, Battista, C, Cabasino, S, Cabibbo, N, Marzano, F, Panizzi, E, Paolucci, P, Sarno, R, Todesco, Gm, Torelli, M, and Vicini, P.

Abstract

We present results for the kaon B parameter obtained by APE-100 from a sample of 100 configurations using the Wilson action and 200 configurations using the Clover action, on a 18(3) x 64 lattice at beta = 6.0. We have also compared the results for B-K using two different values for the effective coupling constant g. We observe a strong dependence of B-K on the prescription adopted for g in the Wilson case, contrary to the results of the Clover case which are almost unaffected by the choice of g.

Published
1995

12. Light-quark physics on different lattices

Author

Allton CR, Crisafulli M, Martinelli G, Bartoloni A, Battista C, Cabasino S, Cabibbo N, Marzano F, Paolucci PS, Pech J, Rapuano F, Sarno R, Todesco GM, Torelli M, Tross W, Vicini P., LUBICZ, Vittorio, Allton, Cr, Crisafulli, M, Lubicz, Vittorio, Martinelli, G, Bartoloni, A, Battista, C, Cabasino, S, Cabibbo, N, Marzano, F, Paolucci, P, Pech, J, Rapuano, F, Sarno, R, Todesco, Gm, Torelli, M, Tross, W, and Vicini, P.

Abstract

The light quark results from three different simulations are summarized. We get consistent results, within our statistics, between smeared and non smeared data. A comparison is performed with similar results from the UKQCD collaboration. All runs have been performed on two 6.4 GF APE computers [1].

Published
1994

13. D-meson and B-meson semileptonic decays

Author

Abada A, Allton CR, Bartoloni A, Battista C, Boucaud P, Cabasino S, Cabibbo N, Carpenter DB, Crisafulli M, Gusken S, Hernandez P, Martinelli G, Marzano F, Paolucci PS, Pech J, Pene O, Rapuano F, Sachrajda CT, Sarno R, Schilling K, Siegert G, Stella N, Todesco GM, Torelli M, Tross W, Vicini P, Vladikas A., LUBICZ, Vittorio, Abada, A, Allton, Cr, Bartoloni, A, Battista, C, Boucaud, P, Cabasino, S, Cabibbo, N, Carpenter, Db, Crisafulli, M, Gusken, S, Hernandez, P, Lubicz, Vittorio, Martinelli, G, Marzano, F, Paolucci, P, Pech, J, Pene, O, Rapuano, F, Sachrajda, Ct, Sarno, R, Schilling, K, Siegert, G, Stella, N, Todesco, Gm, Torelli, M, Tross, W, Vicini, P, and Vladikas, A.

Subjects
High Energy Physics::Lattice, High Energy Physics::Phenomenology, food and beverages, High Energy Physics::Experiment
Abstract

Recent results for semi-leptonic decays of D and B mesons at beta = 6.4, using the Wilson action, and at beta = 6.0, using the Clover action, are reported.

Published
1994

14. A high statistics lattice calculation of fB(static) at beta=6.2 using the Clover action

Author

Allton CR, Crisafulli M, Martinelli G, Salina G, Vladikas A, Bartoloni A, Battista C, Cabasino S, Cabibbo N, Marzano F, Paolucci PS, Pech J, Rapuano F, Sarno R, Todesco GM, Torelli M, Tross W, Vicini P., LUBICZ, Vittorio, Allton, Cr, Crisafulli, M, Lubicz, Vittorio, Martinelli, G, Salina, G, Vladikas, A, Bartoloni, A, Battista, C, Cabasino, S, Cabibbo, N, Marzano, F, Paolucci, P, Pech, J, Rapuano, F, Sarno, R, Todesco, Gm, Torelli, M, Tross, W, and Vicini, P.

Subjects
High Energy Physics::Lattice, High Energy Physics::Experiment
Abstract

We present a calculation of f(B) in the static limit, obtained by numerical simulation of quenched QCD, at beta = 6.2 on a 18(3) x 64 lattice, using the SW-Clover quark action. The decay constant has been extracted by studying heavy (static)-light correlation functions of different smeared operators, on a sample of 220 gauge field configurations. We have obtained f(B)static = (290 +/- 15 +/- 45) MeV, where the first error comes from the uncertainty in the determination of the matrix element and the second comes from the uncertainty in the lattice spacing. We also obtain M(Bs) - M(Bd) = (70 +/- 10) MeV and f(Bs)stat/f(Bd)stat = 1.11 (3). A comparison of our results with other calculations of the same quantity is made.

Published
1994

15. $B \rightarrow K^\star \gamma$ decay on APE

Author

Abada, As., Boucaud, Ph., Crisafulli, M., Leroy, J. P., Lubicz, V., Martinelli, G., Rapuano, F., Serone, M., Stella, N., Bartoloni, A., Battista, C., Cabasino, S., Cabibbo, N., Panizzi, E., Paolucci, P. S., Sarno, R., Todesco, G. M., Torelli, M., Vicini, P., and The APE Collaboration

Published
1995

16. Quenched $B_K$-parameter with the Wilson and Clover actions at $��= 6.0$

Author

Crisafulli, M., Donini, A., Lubicz, V., Martinelli, G., Rapuano, F., Ungarelli, C., Vladikas, A., Collaboration, the APE, Bartoloni, A., Battista, C., Cabasino, S., Cabibbo, N., Marzano, F., Panizzi, E., Paolucci, P. S., Sarno, R., Todesco, G. M., Torelli, M., and Vicini, P.

Subjects
High Energy Physics - Lattice (hep-lat), FOS: Physical sciences
Abstract

We present results for the Kaon $B$ parameter from a sample of $200$ configurations using the Wilson action and $460$ configurations using the Clover action, on a $18^3 \times 64$ lattice at $��=6.0$. A slight improvement of the chiral behaviour of $B_K$ is observed due to the Clover action. We have also compared the results for $B_K$ obtained from two different procedures for the boosting of the coupling constant $g$. We observe a strong dependence of $B_K$ on the prescription adopted for $g$ in the Wilson case, contrary to the results of the Clover case which are almost unaffected by the choice of $g$. Combining some recently obtained non perturbative estimates for the renormalisation constants with our Clover matrix element, we observe a significant improvement in the chiral behaviour of $B_K$., 3 pages, Latex, Postscript file with figures available at ftp://hpteo.roma1.infn.it/pub/preprints/lat94/donini ; to appear in Lattice '94, Nucl. Phys. (Proc.Suppl.)

Published
1995
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17. A high statistic lattice calculation of $\int_{B}^{static}$ at $\beta$ = 6.2 using the Clover action

Author

Allton, C.R., Crisafulli, M., Lubicz, V., Salina, G., Martinelli, G., Vladikas, A., Bartoloni, A., Battista, C., Cabasino, S., Cabibbo, N., Marzano, F., Paolucci, P.S., Pech, J., Rapuano, F., Sarno, R., Todesco, G.M., Torelli, M., Tross, W., and Vicini, P.

Subjects
Particle Physics - Theory
Abstract

We present a calculation of $f_B$ in the static limit, obtained by numerical simulation of quenched QCD, at $\beta=6.2$ on a $18~3 \times 64$ lattice, using the SW-Clover quark action. The decay constant has been extracted by studying heavy(static)-light correlation functions of different smeared operators, on a sample of 220 gauge field configurations. We have obtained $f_B~{static}=(290 \pm 15 \pm 45)$ MeV, where the first error comes from the uncertainty in the determination of the matrix element and the second comes from the uncertainty in the lattice spacing. We also obtain $M_{B_s}-M_{B_d}= (70 \pm 10)$ MeV and $f~{stat}_{B_s}/f~{stat}_{B_d}=1.11(3)$. A comparison of our results with other calculations of the same quantity is made. We present a calculation of ƒ B in the static limit, obtained by numerical simulation of quenched QCD, at β =6.2 on a 18 3 × 64 lattice, using the SW-Clover quark action. The decay constant has been extracted by studying heavy (static)-light correlation functions of different smeared operators, on a sample of 220 gauge field configurations. We have obtained ƒ B static =(290±15±45) MeV , where the first error comes from the uncertainty in the determination of the matrix element and the second comes from the uncertainty in the lattice spacing. We also obtain M B s − M B d =(70±10) MeV and ƒ B s stat /ƒ B d stat =1.11 (3) . A comparison of our results with other calculations of the same quantity is made.

Published
1994

18. PRELIMINARY-RESULTS FROM APE-100

Author

Bartoloni, A, Battista, C, Cabasino, S, Marzano, F, Paolucci, Ps, Pech, J, Rapuano, F, Sarno, R, Todesco, Gm, Torelli, M, Tross, W, Vicini, P, Tripiccione, Raffaele, Cabibbo, N, Salina, G, Fucci, A, Lubicz, V, Maiani, L, Martinelli, G, and Vladikas, A.

Published
1993

19. An overview of the APEmille parallel computer

Author

Aglietti, F, Bartoloni, A, Battista, C, Cabasino, S, Cabibbo, N, Caporali, B, Centurioni, E, Cosimi, M, Errico, W, Laico, F, Magazzú, G, Marzano, F, Michelotti, A, Panizzi, E, Paolucci, P, Rapuano, F, Rinaldi, W, Rossetti, D, Torelli, M, Tripiccione, R, Vicini, P, Vicini, P., RAPUANO, FEDERICO, Aglietti, F, Bartoloni, A, Battista, C, Cabasino, S, Cabibbo, N, Caporali, B, Centurioni, E, Cosimi, M, Errico, W, Laico, F, Magazzú, G, Marzano, F, Michelotti, A, Panizzi, E, Paolucci, P, Rapuano, F, Rinaldi, W, Rossetti, D, Torelli, M, Tripiccione, R, Vicini, P, Vicini, P., and RAPUANO, FEDERICO

Abstract

We describe the architecture of the APEmille Parallel Computer, the new generation of the APE family of processors optimized for Lattice Gauge Theory simulations. We emphasize the features of the new machine potentially useful for applications in other areas of computational physics

Published
1997

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Author

Abada, A, Boucaud, P, Cabibbo, N, Crisafulli, M, Leroy, J, Lubicz, V, Martinelli, G, Rapuano, F, Serone, M, Stella, N, Bartoloni, A, Battista, C, Cabasino, S, Panizzi, E, Paolucci, P, Sarno, R, Todesco, G, Torelli, M, Vicini, P, Vicini, P., RAPUANO, FEDERICO, Abada, A, Boucaud, P, Cabibbo, N, Crisafulli, M, Leroy, J, Lubicz, V, Martinelli, G, Rapuano, F, Serone, M, Stella, N, Bartoloni, A, Battista, C, Cabasino, S, Panizzi, E, Paolucci, P, Sarno, R, Todesco, G, Torelli, M, Vicini, P, Vicini, P., and RAPUANO, FEDERICO

Published
1996

21. Polyakov loops and finite-size effects of hadron masses in full lattice QCD

Author

Antonelli, S., Bellacci, M., Fernández Pérez, Luis Antonio, Muñoz Sudupe, Antonio, Ruiz Lorenzo, J. J., Sarno, R., Tarancón, A., Bartoloni, A., Battista, C., Cabibbo, N., Cabasino, S., Panizzi, E., Paolucci, P. S., Todeesco, G. M., Torelli, M., Tripiccione, R., Vicini, P., Antonelli, S., Bellacci, M., Fernández Pérez, Luis Antonio, Muñoz Sudupe, Antonio, Ruiz Lorenzo, J. J., Sarno, R., Tarancón, A., Bartoloni, A., Battista, C., Cabibbo, N., Cabasino, S., Panizzi, E., Paolucci, P. S., Todeesco, G. M., Torelli, M., Tripiccione, R., and Vicini, P.

Abstract

© 1995 Published by Elsevier B.V.We thank G. Parisi for useful suggestions concerning this work and for many discussions and G.C. Rossi for a careful reading of the manuscript. We acknowledge interesting discussions with E. Marinari. We would like to thank F. Marzano, J. Pech, F. Rapuano for encouragements and support. L.A.F., A.M.S., J.J.R.L. and A.T. acknowledge CICyT (Spain) for partial financial support. J.J.R.L. is also supported by a grant of MEC (Spain)., Polyakov type loops are responsible for the difference between quenched and unquenched finite size effects on the QCD mass spectrum. With a numerical simulation, using appropriate sea quark spatial boundary conditions, we show that we can align the phases of spatial Polyakov loops in a predelined direction. Starting from these results, we propose a procedure to minimize fluctuations due to these effects in meson propagators., CICyT (Spain), MEC (Spain), Depto. de Física Teórica, Fac. de Ciencias Físicas, TRUE, pub

Published
1995

22. APE results of hadron masses in full QCD simulations

Author

Antonelli, S., Bartoloni, A., Battista, C., Bellacci, M., Cabasino, S., Cabibbo, N., Fernández Pérez, Luis Antonio, Panizzi, E., Paolucci, P. S., Muñoz Sudupe, Antonio, Ruiz Lorenzo, J. J., Sarno, R., Tarancón, A., Todesco, G. M., Torelli, M., Vinici, P., Antonelli, S., Bartoloni, A., Battista, C., Bellacci, M., Cabasino, S., Cabibbo, N., Fernández Pérez, Luis Antonio, Panizzi, E., Paolucci, P. S., Muñoz Sudupe, Antonio, Ruiz Lorenzo, J. J., Sarno, R., Tarancón, A., Todesco, G. M., Torelli, M., and Vinici, P.

Abstract

© 1995 Elsevier Science B.V. International Symposium on Lattice Field Theory (LATTICE 94) (12. 1994. Bielefeld, Germany). We thank G. Parisi for many suggestions and useful discussions. We thank for support and discussions E. Marinari, F. Marzano, F. Rapuano, R. Tripiccione and F. Zuliani., Depto. de Física Teórica, Fac. de Ciencias Físicas, TRUE, pub

Published
1995

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Author

Crisafulli, M, Donini, A, Lubicz, V, Martinelli, G, Rapuano, F, Ungarelli, C, Vladikas, A, Bartoloni, A, Battista, C, Cabasino, S, Cabibbo, N, Marzano, F, Panizzi, E, Paolucci, P, Sarno, R, Todesco, G, Torelli, M, Vicini, P, RAPUANO, FEDERICO, Vicini, P., Crisafulli, M, Donini, A, Lubicz, V, Martinelli, G, Rapuano, F, Ungarelli, C, Vladikas, A, Bartoloni, A, Battista, C, Cabasino, S, Cabibbo, N, Marzano, F, Panizzi, E, Paolucci, P, Sarno, R, Todesco, G, Torelli, M, Vicini, P, RAPUANO, FEDERICO, and Vicini, P.

Abstract

We present results for the kaon B parameter obtained by APE-100 from a sample of 100 configurations using the Wilson action and 200 configurations using the Clover action, on a 18(3) x 64 lattice at beta = 6.0. We have also compared the results for B-K using two different values for the effective coupling constant g. We observe a strong dependence of B-K on the prescription adopted for g in the Wilson case, contrary to the results of the Clover case which are almost unaffected by the choice of g

Published
1995

24. The new wave of the APE project: APEmille

Author

Bartoloni, A, Battista, C, Bellacci, M, Cabasino, S, Cabibbo, N, Cosimi, M, Dagostino, U, Marzano, F, Panizzi, E, Paolucci, P, Rapuano, F, Rinaldi, W, Sarno, R, Todesco, G, Torelli, M, Vicini, P, Laico, F, Tripiccione, R, Tripiccione, R., RAPUANO, FEDERICO, Bartoloni, A, Battista, C, Bellacci, M, Cabasino, S, Cabibbo, N, Cosimi, M, Dagostino, U, Marzano, F, Panizzi, E, Paolucci, P, Rapuano, F, Rinaldi, W, Sarno, R, Todesco, G, Torelli, M, Vicini, P, Laico, F, Tripiccione, R, Tripiccione, R., and RAPUANO, FEDERICO

Abstract

We describe APEmille, the latest generation of the APE parallel processors. This machine, an evolution of the APE100 concept, is very efficient for LGT simulations as well as for a broader class of applications requiring massive floating point computations. Several new features characterise this evolution. In particular local addressing capabilities are added to all computing nodes. APEmille also exhibits a higher degree of integration with a network of workstations acting as a global host system. An APEmille system in the Teraflops range will be completed in three-four years. The architecture proposed in this paper is being currently simulated and evaluated. © 1995 Elsevier Science B.V. All rights reserved.

Published
1995

25. A high statistics lattice calculation of using the clover action

Author

Allton, C, Crisafulli, M, Lubicz, V, Martinelli, G, Salina, G, Vladikas, A, Bartoloni, A, Battista, C, Cabasino, S, Cabibbo, N, Marzano, F, Paolucci, P, Pech, J, Rapuano, F, Sarno, R, Todesco, G, Torelli, M, Tross, W, Vicini, P, Vicini, P., RAPUANO, FEDERICO, Allton, C, Crisafulli, M, Lubicz, V, Martinelli, G, Salina, G, Vladikas, A, Bartoloni, A, Battista, C, Cabasino, S, Cabibbo, N, Marzano, F, Paolucci, P, Pech, J, Rapuano, F, Sarno, R, Todesco, G, Torelli, M, Tross, W, Vicini, P, Vicini, P., and RAPUANO, FEDERICO

Published
1994

26. A high statistics lattice calculation of ƒB in the static limit on APE

Author

Allton, C, Lubicz, V, Martinelli, G, Salina, G, Vladikas, A, Bartoloni, A, Battista, C, Cabasino, S, Cabibbo, N, Marzano, F, Paolucci, P, Pech, J, Rapuano, F, Sarno, R, Todesco, G, Torelli, M, Tross, W, Tripiccione, R, Vicini, P, Vicini, P., RAPUANO, FEDERICO, Allton, C, Lubicz, V, Martinelli, G, Salina, G, Vladikas, A, Bartoloni, A, Battista, C, Cabasino, S, Cabibbo, N, Marzano, F, Paolucci, P, Pech, J, Rapuano, F, Sarno, R, Todesco, G, Torelli, M, Tross, W, Tripiccione, R, Vicini, P, Vicini, P., and RAPUANO, FEDERICO

Published
1994

27. D- and B-meson semi-leptonic decays

Author

Abada, A, Allton, C, Bartoloni, A, Battista, C, Boucard, P, Cabasino, S, Cabibbo, N, Carpenter, D, Crisafulli, M, Güsken, S, Hernandez, P, Lubicz, V, Martinelli, G, Marzano, F, Paolucci, P, Pech, J, Pene, O, Rapuano, F, Sachrajda, C, Sarno, R, Schilling, K, Siegert, G, Stella, N, Todesco, G, Torelli, M, Tross, W, Vicini, P, Vladikas, A, Vladikas, A., RAPUANO, FEDERICO, Abada, A, Allton, C, Bartoloni, A, Battista, C, Boucard, P, Cabasino, S, Cabibbo, N, Carpenter, D, Crisafulli, M, Güsken, S, Hernandez, P, Lubicz, V, Martinelli, G, Marzano, F, Paolucci, P, Pech, J, Pene, O, Rapuano, F, Sachrajda, C, Sarno, R, Schilling, K, Siegert, G, Stella, N, Todesco, G, Torelli, M, Tross, W, Vicini, P, Vladikas, A, Vladikas, A., and RAPUANO, FEDERICO

Published
1994

28. Light quark physics on different lattices

Author

Allton, C, Crisafulli, M, Lubicz, V, Martinelli, G, Bartoloni, A, Battista, C, Cabasino, S, Cabibbo, N, Marzano, F, Paolucci, P, Pech, J, Rapuano, F, Sarno, R, Todesco, G, Torelli, M, Tross, W, Vicini, P, RAPUANO, FEDERICO, Vicini, P., Allton, C, Crisafulli, M, Lubicz, V, Martinelli, G, Bartoloni, A, Battista, C, Cabasino, S, Cabibbo, N, Marzano, F, Paolucci, P, Pech, J, Rapuano, F, Sarno, R, Todesco, G, Torelli, M, Tross, W, Vicini, P, RAPUANO, FEDERICO, and Vicini, P.

Abstract

The light quark results from three different simulations are summarized. We get consistent results, within our statistics, between smeared and non smeared data. A comparison is performed with similar results from the UKQCD collaboration. All runs have been performed on two 6.4 GF APE computers [1]

Published
1994

29. Decay constants of heavy-light mesons

Author

Allton, C, Crisafulli, M, Lubicz, V, Martinelli, G, Salina, G, Bartoloni, A, Battista, C, Cabasino, S, Cabibbo, N, Marzano, F, Paolucci, P, Pech, J, Rapuano, F, Sarno, R, Todesco, G, Torelli, M, Tross, W, Vicini, P, RAPUANO, FEDERICO, Vicini, P., Allton, C, Crisafulli, M, Lubicz, V, Martinelli, G, Salina, G, Bartoloni, A, Battista, C, Cabasino, S, Cabibbo, N, Marzano, F, Paolucci, P, Pech, J, Rapuano, F, Sarno, R, Todesco, G, Torelli, M, Tross, W, Vicini, P, RAPUANO, FEDERICO, and Vicini, P.

Abstract

The decay constants of the heavy-light pseudoscalar mesons are studied in a high statistics run using the Wilson action at beta = 6.0 and beta = 6.2, and the clover action at beta = 6.0. The systematics of O(a) discretisation errors are discussed. Our best estimates of the decay constants are: f(D) = 218(9) MeV, f(D)/f(D s) = 1.11(1) and we obtain preliminary values for f(B)

Published
1994

30. THE APE-100 COMPUTER: (I) THE ARCHITECTURE

Author

Battista, C, Cabasino, S, Marzano, F, Paolucci, P, Pech, J, Rapuano, F, Sarno, R, Todesco, G, Torelli, M, Tross, W, Vicini, P, Cabibbo, N, Marinari, E, Parisi, G, Salina, G, Prete, F, Lai, A, Lombardo, M, Tripiccione, R, Fucci, A, Battista,C, Marzano,F, Paolucci, P., Pech, J., Todesco, GM, Torelli,M, Marinari,E, Prete, FD, Lombardo, MP, Fucci A., RAPUANO, FEDERICO, Battista, C, Cabasino, S, Marzano, F, Paolucci, P, Pech, J, Rapuano, F, Sarno, R, Todesco, G, Torelli, M, Tross, W, Vicini, P, Cabibbo, N, Marinari, E, Parisi, G, Salina, G, Prete, F, Lai, A, Lombardo, M, Tripiccione, R, Fucci, A, Battista,C, Marzano,F, Paolucci, P., Pech, J., Todesco, GM, Torelli,M, Marinari,E, Prete, FD, Lombardo, MP, Fucci A., and RAPUANO, FEDERICO

Published
1993

31. This title is unavailable for guests, please login to see more information.

Author

Cabasino, S, Marzano, F, Pech, J, Rapuano, F, Sarno, R, Todesco, G, Tross, W, Cabibbo, N, Guagnelli, M, Marinari, E, Paolucci, P, Parisi, G, Salina, G, Laj, A, Lombardo, M, Tripiccione, R, Remiddi, E, RAPUANO, FEDERICO, Remiddi, E., Cabasino, S, Marzano, F, Pech, J, Rapuano, F, Sarno, R, Todesco, G, Tross, W, Cabibbo, N, Guagnelli, M, Marinari, E, Paolucci, P, Parisi, G, Salina, G, Laj, A, Lombardo, M, Tripiccione, R, Remiddi, E, RAPUANO, FEDERICO, and Remiddi, E.

Abstract

We discuss the Ape Collaboration results for the hadronic mass spectrum obtained in the staggered fermion formulation at beta = 6.0 on a 24(3) x 32 lattice. We underscore the good features that are coming out at higher beta-values, as for example the value of the sigma-term, the status of flavor symmetry and the relation with Wilson fermion discretization

Published
1991

32. This title is unavailable for guests, please login to see more information.

Author

Cabasino, S, Marzano, F, Pech, J, Rapuano, F, Sarno, R, Todesco, G, Tross, W, Cabibbo, N, Guagnelli, M, Marinari, E, Paolucci, P, Parisi, G, Salina, G, Lombardo, M, Tripiccione, R, Remiddi, E, RAPUANO, FEDERICO, Remiddi, E., Cabasino, S, Marzano, F, Pech, J, Rapuano, F, Sarno, R, Todesco, G, Tross, W, Cabibbo, N, Guagnelli, M, Marinari, E, Paolucci, P, Parisi, G, Salina, G, Lombardo, M, Tripiccione, R, Remiddi, E, RAPUANO, FEDERICO, and Remiddi, E.

Abstract

We discuss the Ape Collaboration recent results for the Wilson fermions hadronic mass spectrum at beta = 6.0 on a 24(3) X 32 lattice. Some of the main new points are the results for the nucleon-sigma term and the estimates for excited states

Published
1991

33. Progress and status of APEmille

Author

Bartoloni, A., primary, Cabasino, S., additional, Cabibbo, N., additional, Cosimi, M., additional, De Riso, P., additional, Errico, W., additional, Giovannetti, S., additional, Laico, F., additional, Leich, H., additional, Lonardo, A., additional, Magazzú, G., additional, Michelotti, A., additional, Panizzi, E., additional, Paolucci, P.S., additional, Rossetti, D., additional, Schwendicke, U., additional, Simma, H., additional, Sulanke, K.H., additional, Torelli, M., additional, Tripiccione, R., additional, and Vicini, P., additional

Published
1998
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34. An overview of the APEmille project

Author

Bartoloni, A., primary, Cabasino, S., additional, Cosimi, M., additional, De Riso, P., additional, Lonardo, A., additional, Michelotti, A., additional, Panizzi, E., additional, Paolucci, P.S., additional, Rossetti, D., additional, Torelli, M., additional, Vicini, P., additional, Cabibbo, N., additional, Errico, W., additional, Giovannetti, S., additional, Laico, F., additional, Magazzú, G., additional, Tripiccione, R., additional, and Simma, H., additional

Published
1998
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35. Status of quenched QCD on ape computers

Author

Cabasino, S, Cabibbo, N, Fernández, L, Gunduc, Y, Lombardo, M, Marinari, E, Marzano, F, Paolucci, P, Parisi, G, Pech, J, Rapuano, F, Remiddi, E, Salina, G, Sarno, R, Tarancón, A, Todesco, G, Tripiccione, R, Tross, W, Tross, W., RAPUANO, FEDERICO, Cabasino, S, Cabibbo, N, Fernández, L, Gunduc, Y, Lombardo, M, Marinari, E, Marzano, F, Paolucci, P, Parisi, G, Pech, J, Rapuano, F, Remiddi, E, Salina, G, Sarno, R, Tarancón, A, Todesco, G, Tripiccione, R, Tross, W, Tross, W., and RAPUANO, FEDERICO

Abstract

I report on the recent work done by the Ape Collaboration. © 1990.

Published
1990

36. An overview of the APEmille parallel computer

Author

Aglietti, F, primary, Bartoloni, A, additional, Battista, C, additional, Cabasino, S, additional, Cabibbo, N, additional, Caporali, B, additional, Centurioni, E, additional, Cosimi, M, additional, Errico, W, additional, Laico, F, additional, Magazzú, G, additional, Marzano, F, additional, Michelotti, A, additional, Panizzi, E, additional, Paolucci, P.S, additional, Rapuano, F, additional, Rinaldi, W, additional, Rossetti, D, additional, Torelli, M, additional, Tripiccione, R, additional, and Vicini, P, additional

Published
1997
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37. A lattice study of the exclusive decay amplitude, using the Clover action at β = 6.0

Author

Abada, As, primary, Boucaud, Ph, additional, Cabibbo, N, additional, Crisafulli, M, additional, Leroy, J.P, additional, Lubicz, V, additional, Martinelli, G, additional, Rapuano, F, additional, Serone, M, additional, Stella, N, additional, Bartoloni, A, additional, Battista, C, additional, Cabasino, S, additional, Panizzi, E, additional, Paolucci, P.S, additional, Sarno, R, additional, Todesco, G.M, additional, Torelli, M, additional, and Vicini, P, additional

Published
1996
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38. Quenched BK-parameter with the Wilson and Clover actions at β = 6.0

Author

Crisafulli, M., primary, Donini, A., additional, Lubicz, V., additional, Martinelli, G., additional, Rapuano, F., additional, Ungarelli, C., additional, Vladikas, A., additional, Bartoloni, A., additional, Battista, C., additional, Cabasino, S., additional, Cabibbo, N., additional, Marzano, F., additional, Panizzi, E., additional, Paolucci, P.S., additional, Sarno, R., additional, Todesco, G.M., additional, Torelli, M., additional, and Vicini, P., additional

Published
1995
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39. The new wave of the APE project: APEmille

Author

Bartoloni, A., primary, Battista, C., additional, Bellacci, M., additional, Cabasino, S., additional, Cabibbo, N., additional, Cosimi, M., additional, Dagostino, U., additional, Marzano, F., additional, Panizzi, E., additional, Paolucci, P.S., additional, Rapuano, F., additional, Rinaldi, W., additional, Sarno, R., additional, Todesco, G.M., additional, Torelli, M., additional, Vicini, P., additional, Laico, F., additional, and Tripiccione, R., additional

Published
1995
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40. APE results of hadron masses in full QCD simulations

Author

Antonelli, S., primary, Bartoloni, A., additional, Battista, C., additional, Bellacci, M., additional, Cabasino, S., additional, Cabibbo, N., additional, Fernández, L.A., additional, Panizzi, E., additional, Paolucci, P.S., additional, Muñoz-Sudupe, A., additional, Ruiz-Lorenzo, J.J., additional, Samo, R., additional, Tarancón, A., additional, Todesco, G.M., additional, Torelli, M., additional, and Vicini, P., additional

Published
1995
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41. B → K* γ decay on APE

Author

Abada, As., primary, Boucaud, Ph., additional, Crisafulli, M., additional, Leroy, J.P., additional, Lubicz, V., additional, Martinelli, G., additional, Rapuano, F., additional, Serone, M., additional, Stella, N., additional, Bartoloni, A., additional, Battista, C., additional, Cabasino, S., additional, Cabibbo, N., additional, Panizzi, E., additional, Paolucci, P.S., additional, Sarno, R., additional, Todesco, G.M., additional, Torelli, M., additional, and Vicini, P., additional

Published
1995
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42. Polyakov loops and finite-size effects of hadron masses in full lattice QCD

Author

Antonelli, S., primary, Bellacci, M., additional, Fernández, L.A., additional, Muñoz-Sudupe, A., additional, Ruiz-Lorenzo, J.J., additional, Sarno, R., additional, Tarancón, A., additional, Bartoloni, A., additional, Battista, C., additional, Cabibbo, N., additional, Cabasino, S., additional, Panizzi, E., additional, Paolucci, P.S., additional, Todesco, G.M., additional, Torelli, M., additional, Tripiccione, R., additional, and Vicini, P., additional

Published
1995
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43. A high statistics lattice calculation of using the clover action

Author

Allton, C.R., primary, Crisafulli, M., additional, Lubicz, V., additional, Martinelli, G., additional, Salina, G., additional, Vladikas, A., additional, Bartoloni, A., additional, Battista, C., additional, Cabasino, S., additional, Cabibbo, N., additional, Marzano, F., additional, Paolucci, P.S., additional, Pech, J., additional, Rapuano, F., additional, Sarno, R., additional, Todesco, G.M., additional, Torelli, M., additional, Tross, W., additional, and Vicini, P., additional

Published
1994
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44. Decay constants of heavy-light mesons

Author

Allton, C.R., primary, Crisafulli, M., additional, Lubicz, V., additional, Martinelli, G., additional, Salina, G., additional, Bartoloni, A., additional, Battista, C., additional, Cabasino, S., additional, Cabibbo, N., additional, Marzano, F., additional, Paolucci, P.S., additional, Pech, J., additional, Rapuano, F., additional, Sarno, R., additional, Todesco, G.M., additional, Torelli, M., additional, Tross, W., additional, and Vicini, P., additional

Published
1994
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45. A high statistics lattice calculation of ƒB in the static limit on APE

Author

Allton, C.R., primary, Lubicz, V., additional, Martinelli, G., additional, Salina, G., additional, Vladikas, A., additional, Bartoloni, A., additional, Battista, C., additional, Cabasino, S., additional, Cabibbo, N., additional, Marzano, F., additional, Paolucci, P.S., additional, Pech, J., additional, Rapuano, F., additional, Sarno, R., additional, Todesco, G.M., additional, Torelli, M., additional, Tross, W., additional, Tripiccione, R., additional, and Vicini, P., additional

Published
1994
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46. LBE SIMULATIONS OF RAYLEIGH-BÉNARD CONVECTION ON THE APE100 PARALLEL PROCESSOR

Author

BARTOLONI, A., primary, BATTISTA, C., additional, CABASINO, S., additional, PAOLUCCI, P. S., additional, PECH, J., additional, SARNO, R., additional, TODESCO, G. M., additional, TORELLI, M., additional, TROSS, W., additional, VICINI, P., additional, BENZI, R., additional, CABIBBO, N., additional, MASSAIOLI, F., additional, and TRIPICCIONE, R., additional

Published
1993
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47. A HARDWARE IMPLEMENTATION OF THE APE100 ARCHITECTURE

Author

BARTOLONI, A., primary, BASTIANELLO, G., additional, BATTISTA, C., additional, CABASINO, S., additional, MARZANO, F., additional, PAOLUCCI, P. S., additional, PECH, J., additional, RAPUANO, F., additional, PANIZZI, E., additional, SARNO, R., additional, TODESCO, G. M., additional, TORELLI, M., additional, TROSS, W., additional, VICINI, P., additional, CABIBBO, N., additional, FUCCI, A., additional, and TRIPICCIONE, R., additional

Published
1993
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48. A high performance single chip processing unit for parallel processing and data acquisition systems

Author

Bastianello, G., primary, Borgognoni, R., additional, Battista, C., additional, Cabasino, S., additional, Cabibbo, N., additional, Fucci, A., additional, Lai, A., additional, Marzano, F., additional, Paolucci, P.S., additional, Pech, J., additional, Sarno, R., additional, Todesco, G.M., additional, Torelli, M., additional, Tripiccione, R., additional, Tross, W., additional, and Vicini, P., additional

Published
1993
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50. The APE100 project.

Author

Avico, N., Battista, C., Cabasino, S., Cabibbo, N., Del Prete, F., Fucci, A., Lai, A., Lombardo, M. P., Marinari, E., Marzano, F., Paolucci, P. S., Parisi, G., Pech, J., Rapuano, F., Sarno, R., Salina, G., Todesco, G. M., Torelli, M., Tripiccione, R., and Tross, W.

Published
1990
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