Bergische Universität Wuppertal
Forschungsbericht 2003 - 2005

Fachbereich C - Mathematik und Naturwissenschaften
Physik

Computergestützte Elementarteilchenphysik

Leiter: Prof. em. Klaus Schilling

Anschrift:
Fachbereich C, Zimmer D10.20
Berg. Universität Wuppertal
email: schillin@theorie.physik.uni-wuppertal.de

Allgemeiner Überblick:

Die Quantenchromodynamik wird als die fundamentale Theorie der Starken Wechselwirkung angesehen, ist aber analytisch weitgehend nicht auswertbar.  Ihre Vorhersagen werden daher nichtperturbativ, durch Simulation auf Supercomputern untersucht.  Wegen der hohen Ressourcenanforderungen kommen bei der Computer-Implementation modernste Methoden der Angewandten Mathematik und Informatik zur Anwendung.  Dabei spielte das parallele Supercomputersystem ALICE an der Bergischen Universität eine entscheidende Rolle.

Für den Berichtzeitraum ist besonders hinzuweisen  auf die in Physical Revue D veröffentlichte Arbeit 4, mit der erstmals überhaupt in diesem Rahmen  die Berechnung  des Zerfalls von schweren Quarkonium Zuständen gelang und die daher  einen wichtigen Meilenstein in der Simulation der QCD darstellt.

Forschungsbereiche:

• Theoretische Physik,

• Elementarteilchenphysik,

• Numerik,

• Algorithmen,

• Informatik.

Wissenschaftliche Zusammenarbeiten:

• Vrije Univ. Amsterdam,

• Cyprus University in Nicosia,

• Boston University,

• Glasgow University,

• Jefferson Lab.,

• Technische Hochschule Karlsruhe,

• Liverpool University,

• University College London,

• Massachussets Institute of Technology in Boston,

• Zentralinstitut für Angewandte Mathematik im Forschungszentrum Jülich,

• ETH Zürich

Veröffentlichungen:

1) DEMONSTRATION OF STRING BREAKING IN QUANTUM CHROMODYNAMICS BY LARGE-SCALE EIGENVALUE COMPUTATIONS.  By N. Attig, T. DC<ssel, T. Lippert (Julich, NIC), G.S. Bali (Glasgow U.), H. Neff (Boston U.), Z. Prkacin, K. Schilling (Wuppertal U.),. 2005. 4pp.  Prepared for Conference on Computational Physics (CCP 2004), Genoa, Italy, 1-4 Sep 2004.  Published in Comput.Phys.Commun.169:382-385,2005

2) STRING BREAKING.  By Gunnar S Bali (Glasgow U.), Thomas Dussel (ZAM, Julich), Thomas Lippert (ZAM, Julich & Wuppertal U.), Hartmut Neff (University Coll. London), Zdravko Prkacin (ZAM, Julich), Klaus Schilling (Wuppertal U.),. Dec 2005. 8pp.  Talk given at Workshop on Computational Hadron Ph26) FAST PARALLEL I/O ON CLUSTER COMPUTERS.  By Thomas Düssel, Norbert Eicker, Florin Isaila, Thomas Lippert, Thomas Moschny, Hartmut Neff, Klaus Schilling, Walter Tichy. Mar 2003. 22pp. ** Temporary entry ** e-Print Archive: cs.dc/0303016ysics (Hadron Physics 13), Nicosia, Cyprus, 14-17 Sep 2005. e-Print Archive: hep-lat/0512018

3) ANATOMY OF STRING BREAKING IN QCD.  By Zdravko Prkacin (Wuppertal U.), Gunnar S Bali (Glasgow U.), Thomas Düssel (Jülich, Forschungszentrum), Thomas Lippert (Wuppertal U. & Jülich, Forschungszentrum), Hartmut Neff (University Coll. London), Klaus Schilling (Wuppertal U.),. Oct 2005. 6pp.  Talk given at 23rd International Symposium on Lattice Field Field: Lattice 2005, Trinity College, Dublin, Ireland, 25-30 Jul 2005.  Published in PoS LAT2005:308,2005 e-Print Archive: hep-lat/0510051

4) OBSERVATION OF STRING BREAKING IN QCD.  By SESAM Collaboration: Gunnar S. Bali (Glasgow U.), Hartmut Neff (Boston U.), Thomas DCssel, Thomas Lippert (NIC, Jülich Forschungszentrum), Klaus Schilling (Wuppertal U.). May 2005. 27pp.  Published in Phys.Rev.D71:114513,2005 e-Print(Jefferson Lab.) Archive: hep-lat/0505012

5) FINITE-SIZE EFFECTS IN LATTICE QCD WITH DYNAMICAL WILSON FERMIONS.  By Boris Orth, Thomas Lippert (Wuppertal U. & Jülich, NIC), Klaus Schilling (Wuppertal U.). WUB-05-03, FZJ-ZAM-IB-2005-01, Mar 2005. 21pp.  Published in Phys.Rev.D72:014503,2005 e-Print Archive: hep-lat/0503016

6) NUMERICAL METHODS FOR THE QCD OVERLAP OPERATOR IV: HYBRID MONTE CARLO.  By N. Cundy, S. Krieg (Wuppertal U.), G. Arnold (Jülich, NIC), A. Frommer (Wuppertal U., Dept. Math.), Th. Lippert (Jülich, NIC & Wuppertal U.), K. Schilling (Wuppertal U.),. Feb 2005. 49pp.  e-Print Archive: hep-lat/0502007

7) HELICITY DEPENDENT AND INDEPENDENT GENERALIZED PARTON DISTRIBUTIONS OF THE NUCLEON IN LATTICE QCD.  By LHPC Collaboration: Ph. Hagler (Vrije U., Amsterdam), J.W. Negele, D.B. Renner, W. Schroers (MIT, LNS), T. Lippert, K. Schilling (Wuppertal U.). Oct 2004. 5pp.  Talk given at 8th Workshop on Electron Nucleus Scattering, Elba, Italy, 21-25 Jun 2004.  Published in Eur.Phys.J.A24S1:29-33,2005 e-Print Archive: hep-ph/0410017

8) STRING BREAKING WITH DYNAMICAL WILSON FERMIONS.  By G.S. Bali (Glasgow U.), Th. DC<ssel, Th. Lippert (Jülich, Forschungszentrum), H. Neff (Boston U.), Z. Prkacin, K. Schilling (Wuppertal U.),. 2005. 3pp.  Contribution to the 22^nd International Symposium on Lattice Field Theory (Lattice 2004), Batavia, Illinois, 21-26 Jun 2004.  Published in Nucl.Phys.Proc.Suppl.140:609-611,2005 Also in *Batavia 2004, Lattice field theory* 609-611 e-Print Archive: hep-lat/0409137

9) DYNAMICAL OVERLAP SIMULATIONS USING HMC.  By N. Cundy, S. Krieg (Wuppertal U.), A. Frommer (Wuppertal U., Dept. Math.), Th. Lippert (Jülich, NIC), K. Schilling (Wuppertal U.),. Sep 2004. 3pp.  Talk given at 22nd International Symposium on Lattice Field Theory (Lattice 2004), Batavia, Illinois, 21-26 Jun 2004.  Published in Nucl.Phys.Proc.Suppl.140:841-843,2005 Also in *Batavia 2004, Lattice field theory* 841-843 e-Print Archive: hep-lat/0409029

10) QUARKS ON THE LATTICE. (In German) By T. Lippert (Jülich, Forschungszentrum), K. Schilling (Wuppertal U.), 2004. 6pp.  Published in Phys.J.3N5:65-70,2004.  14) LIGHT HADRONS IN A BOX.  By T. Lippert, B. Orth, K. Schilling (Wuppertal U.). Feb 2004. 10pp.  Prepared for NIC Symposium 2004, Jülich, Germany, 17-18 Feb 2004.  Published in *Jülich 2004, NIC symposium 2004* 139-148

11) INSIGHT INTO NUCLEON STRUCTURE FROM LATTICE CALCULATIONS OF MOMENTS OF PARTON AND GENERALIZED PARTON DISTRIBUTIONS.  J.W. Negele (MIT, LNS), R.C. Brower (Boston U.), P. Dreher, R. Edwards (Jefferson Lab.), George Tamminga Fleming, Ph. Hagler, U.M. Heller (Tal(Jefferson Lab.)lahassee U.), Th. Lippert (Wuppertal U.), A.V. Pochinsky, D.B. Renner (MIT), D. Richards (Jefferson Lab.), K. Schilling (Wuppertal U.), W. Schroers (MIT). JLAB-THY-04-15, Apr 2004. 9pp.  Prepared for 2nd Cairns Topical Workshop on Lattice Hadron Physics 2003 (LHP 2003), Cairns, Australia, 22-30 Jul 2003.  Published in Nucl.Phys.Proc.Suppl.128:170-178,2004 Also in *Cairns 2003, Lattice hadron physics* 170-178 e-Print Archive: hep-lat/0404005

12) COMPUTING THE ETA AND ETA-PRIME MESONS IN LATTICE QCD.  By Klaus Schilling, Hartmut Neff (Boston U.), Thomas Lippert (Wuppertal U.), Jan 2004. 29pp.  Introductory review based on a talk presented by K. Schilling at the 1st Workshop on Lattice Hadron Physics, Cairns, Australia.  Published in Lect.Notes Phys.663:147-176,2005 Also in *Cairns 2003, Lattice hadron physics* 147-176 e-Print Archive: hep-lat/0401005 (Jefferson Lab.)

13) A PARTIALLY QUENCHED ANALYSIS OF THE ETA - ETA-PRIME SYSTEM IN N(F) = 2 QCD.  By H. Neff (Boston U., Ctr. Comp. Sci.), Th. Lippert (Wuppertal U.), J. Negele (MIT, LNS), K. Schilling (Wuppertal U.),. Jan 2004. 3pp. Contributed to 21st International Symposium on Lattice Field Theory (LATTICE 2003), Tsukuba, Ibaraki, Japan, 15-19 Jul 2003.  Published in Nucl.Phys.Proc.Suppl.129:218-220,2004 Also in *Tsukuba 2003, Lattice 2003* 218-220 e-Print Archive: hep-lat/0401004

14) TRANSVERSE STRUCTURE OF NUCLEON PARTON DISTRIBUTIONS FROM LATTICE QCD.  By LHPC Collaboration and SESAM Collaboration (LHPC et al.). CTP-3452, Dec 2003. 4pp.  Published in Phys.Rev.Lett.93:112001,2004 e-Print Archive: hep-lat/0312014 19) VOLUME DEPENDENCE OF LIGHT HADRON MASSES IN FULL LATTICE QCD.  By B. Orth, T. Lippert, K. Schilling (Wuppertal U.),. Sep 2003. 3pp. Submitted to 21st International Symposium on Lattice Field Theory (LATTICE 2003), Tsukuba, Ibaraki, Japan, 15-19 Jul 2003.  Published in Nucl.Phys.Proc.Suppl.129:173-175,2004 Also in *Tsukuba 2003, Lattice 2003* 173-175 e-Print Archive: hep-lat/0309085

15) MOMENTS OF NUCLEON SPIN DEPENDENT GENERALIZED PARTON DISTRIBUTIONS.  By LHPC collaboration and SESAM collaboration (W. Schroers et al.).  W. Schroers (MIT, LNS), R.C. Brower, P. Dreher, R. Edwards, George Tamminga Fleming, P. Hagler, U.M. Heller, T. Lippert, J.W. Negele, A.V. Pochinsky, D.B. Renner, D. Richards, K. Schilling (Boston U. & Jefferson Lab & APS, Maryland & Wuppertal U.).  JLAB-THY-03-235, Sep 2003. 3pp.  To appear in the proceedings of 21st International Symposium on Lattice Field Theory (LATTICE 2003), Tsukuba, Ibaraki, Japan, 15-19 Jul 2003.  Published in Nucl.Phys.Proc.Suppl.129:907-909,2004 Also in *Tsukuba 2003, Lattice 2003* 907-909 e-Print Archive: hep-lat/0309065

16) INSIGHT INTO NUCLEON STRUCTURE FROM GENERALIZED PARTON DISTRIBUTIONS.  By LHPC Collaboration and SESAM Collaboration J.W. Negele (MIT, LNS), R.C. Brower, P. Dreher, R. Edwards, George Tamminga Fleming, P. Hagler, T. Lippert, A.V. Pochinsky, D.B. Renner, D. Richards, K. Schilling, W. Schroers (Boston U. & Jefferson Lab & Wuppertal U.). MIT-THY-03-236, Sep 2003. 3pp.  Submitted to 21st International Symposium on Lattice Field Theory (LATTICE 2003), Tsukuba, Ibaraki, Japan, 15-19 Jul 2003.  Published in Nucl.Phys.Proc.Suppl.129:910-912,2004 Also in *Tsukuba 2003, Lattice 2003* 910-912 e-Print Archive: hep-lat/0309060

17) GAMMA N ---> DELTA TRANSITION FORM-FACTORS IN QUENCHED AND N(F) = 2 QCD. By C. Alexandrou (Cyprus U.), P. de Forcrand (Zürich, ETH & CERN), T. Lippert (Wuppertal U.), H. Neff (IASA, Athens & Athens U. & Boston U.), J.W. Negele (MIT, LNS), K. Schilling (Wuppertal U.), W. Schroers (MIT, LNS), A. Tsapalis (Cyprus U.),. Sep 2003. 3pp.  Contributed to 21st International Symposium on Lattice Field Theory (LATTICE 2003), Tsukuba, Ibaraki, Japan, 15-19 Jul 2003. Published in Nucl.Phys.Proc.Suppl.129:302-304,2004 Also in *Tsukuba 2003, Lattice 2003* 302-304 e-Print Archive: hep-lat/0309041

18) N TO DELTA ELECTROMAGNETIC TRANSITION FORM-FACTORS FROM LATTICE QCD.  By C. Alexandrou (Cyprus U.), Ph. de Forcrand (Zurich, ETH & CERN), Th. Lippert (Wuppertal U.), H. Neff (IASA, Athens & Boston U.), J.W. Negele (MIT, LNS), K. Schilling (Wuppertal U.), W. Schroers (MIT, LNS), A. Tsapalis (Cyprus U.),. Jul 2003. 14pp.  Published in Phys.Rev.D69:114506,2004 e-Print Archive: hep-lat/0307018

19) ON THE SCALING OF COMPUTATIONAL PARTICLE PHYSICS CODES ON CLUSTER COMPUTERS.  By Z. Sroczynski (Liverpool U., Dept. Math.), N. Eicker, T. Lippert, B. Orth, K. Schilling (Wuppertal U.),. Jul 2003. 26pp.  e-Print Archive: hep-lat/0307015

20) MOMENTS OF NUCLEON GENERALIZED PARTON DISTRIBUTIONS IN LATTICE QCD.  By LHPC collaboration and SESAM collaboration: Philipp Hagler, John Negele, D.B. Renner, W. Schroers (MIT, LNS), T. Lippert, K. Schilling (Wuppertal U.). MIT-CPT-3353, Apr 2003. 16pp.  Published in Phys.Rev.D68:034505,2003 e-Print Archive: hep-lat/0304018

21) FAST PARALLEL I/O ON CLUSTER COMPUTERS.  By Thomas Düssel, Norbert Eicker, Florin Isaila, Thomas Lippert, Thomas Moschny, Hartmut Neff, Klaus Schilling, Walter Tichy. Mar 2003. 22pp. ** Temporary entry ** e-Print Archive: cs.dc/0303016

Promotionen

• Guido Arnold, Der Phasenübergang in der U(1)-Gittereichtheorie, Dissertation Wuppertal 2003

• Boris Orth, Finite-Size Effects in Lattice QCD with Dynamical Wilson Fermions, Dissertation Wuppertal 2004

Diplomarbeiten

• Thomas Düssel, Stringbreaking in der QCD mit dynamischen Fermionen, Diplomarbeit Wuppertal 2003