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Hadron Structure from Lattice QCD

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Hadron Structure from Lattice QCD BNL-5 26 7 4 Formal Report Proceedings of RIKEN BNL Research Center Workshop Volume 41 Hadron Structure from Lattice QCD March 18 - 22,2002 0rg a nize rs : T. Blum, D. Boer, M. Creutz, S. Ohta, and K. Orginos RIKEN BNL Research Center Building 51OA, Brookhaven National Laboratory, Upton, NY 11973-5000, USA DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereox nor any employees, nor any of their contractors, subcontractors or their employees, makes any warranty, express or implied, or assumes any legal liability or responsibilityfor the accuracy, completeness, or any third party’s use or the results of such use of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specijk commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof or its contractors or subcontractors. The views and opinions of authors expressed herein do not necessarily state or refect those of the United States Government or any agency thereoJ: Available electronically at- http://www.doe.gov/bridge Available to U.S. Department of Energy and its contractors in paper from- U.S. Department of Energy Office of Scientific and Technical Information P.O. Box 62 Oak Ridge, TN 3783 1 (423) 576-840 1 Available to the public from- U.S. Department of Commerce National Technical Information Service 5285 Port Royal Road Springfield, VA 22 131 (703) 487-4650 @ Printed on recycled paper Preface to the Series The RIKEN BNL Research Center (RBRC) was established in April 1997 at Brookhaven National Laboratory. It is funded by the "Rikagaku Kenkyusho" (RIKEN, The Institute of Physical and Chemical Research) of Japan. The Center is dedicated to the study of strong interactions, including spin physics, lattice QCD, and RHIC physics through the nurturing of a new generation of young physicists. During the first year, the Center had only a Theory Group. In the second year, an Experimental Group was also established at the Center. At present, there are seven Fellows and eight Research Associates in these two groups. During the third year, we started a new Tenure Track Strong Interaction Theory RHIC Physics Fellow Program, with six positions in the first academic year, 1999-2000. This program has increased to include ten theorists and one experimentalist in the current academic year, 200 1-2002. Beginning this year there is a new RIKEN Spin Program at Rl3RC with four Researchers and three Research Associates. In addition, the Center has an active workshop program on strong interaction physics with each workshop focused on a specific physics problem. Each workshop speaker is encouraged to select a few of the most important transparencies from his or her presentation, accompanied by a page of explanation. This material is collected at the end of the workshop by the organizer to forrn proceedings, which can therefore be available within a short time. To date there are forty-two proceeding volumes available. The construction of a 0.6 teraflops parallel processor, dedicated to lattice QCD, begun at the Center on February 19, 1998, was completed on August 28, 1998. T. D. Lee August 2,2001 *Work perf'ormed under the auspices of U.S.D.O.E. Contract No. DE-AC02-98CH10886. CONTENTS Preface to the Series.............................................................................................. i Introduction Tom Blum, Daniel Boer, Mike Creutz, Shigemi Ohta and Kostas Orginos.. ...................... 1 Hadron Structure from QCDSF Gewit Schierholz .......................................................................................... 3 Light-Front Methods and Non-Perturbative QCD Stanley Brodshy ........................................................................................... 11 Factorization, Local and Nonlocal Operators George Sterrnan .......................................................................................... 33 Chiral Aspects of Parton Physics Xiangdong Ji .............................................................................................. 4 1 Transversity Measurements at RHIC and JSEK Akio Ogawa ................................................................................................ 47 Helicity Distributions at RHIC YUJZ.. Goto.. ................................................................................................. 53 Chiral Corrections to Nucleon Parton Distributions Jiunn-Wei Chen............................................................................................ 59 Connecting Structure Functions on the Lattice with Phenomenology Wally Melnitchouk.. ...................................................................................... 65 Chiral Symmetry with Overlap Fermions Keh-Fei Liu................................................................................................ 75 Excited Baryon Spectroscopy David Richards. ............................................................................................ 8 1 Study of Nucleon Light Cone Quark Distributions in Quenched, Full and Cooled Lattice QCD John Negele. ............................................................................................... 89 Instanton Contribution to the Hadronic Masses and Electro-Magnetic Form Formfactors Pietro Faccioli. ............................................................................................ 97 Dirac Operator Spectrum and Topology with Domain Wall Fermions Torn Blurn.. ................................................................................................. 103 Improved Domain Wall Fermions Kostas Orginos ............................................................................................. 111 Lattice QCD with Two Flavor Dynamical Domain-Wall Quarks Taku Izubuchi .............................................................................................. 119 Flavor Singlet and Exotic Mesons on the Lattice Chris Michael .............................................................................................. 125 Isovector Axial Charge of the Nucleon from Lattice QCD Shoichi Sasaki ............................................................................................. 133 Lightcone Nonlocality and Lattice QCD Daniel Boer ................................................................................................ 139 Hard Scattering in the QCD String Rich Brower ................................................................................................ 145 Relativistic Heavy Quarks on the Lattice Sinya Aoki ................................................................................................... 151 Non-Perturbative Renormalization with DWF Chris Dawson ............................................................................................... 157 One Loop Average Momentum of Singlet Parton Densities in the Schroedinger Functional Scheme Filippo Palombi ........................................................................................... 163 Baryons in Partially Quenched QCD Martin Savage ............................................................................................. 171 Non-Perturbative Renormalization in the Finite Box Sinya Aoki ................................................................................................... 177 Breaking the Multi-Loop Barrier in Lattice Perturbation Theory Paul Rakow ................................................................................................ 183 List of Registered Participants .................................................................................. 189 Agenda ............................................................................................................. 193 Additional RIISEN BNL Research Center Proceeding Volumes ........................................... 195 Contact Information Hadron Structure from Lattice QCD Introduction The RIKEN BNL Research Center workshop on “Hadron Structure from Lattice QCD” was held at BNL during March 11-15, 2002. Hadron structure has been the subject of many theoretical and experimental investigations, with significant success in understanding the building blocks of matter. The nonperturbative nature of QCD, however, has always been an obstacle to deepening our understanding of hadronic physics. Lattice QCD provides the tool to overcome these difficulties and hence a link can be established between the fundamental theory of QCD and hadron phenomenology. Due to the steady progress in improving lattice calculations over the years, comparison with experimentally measured hadronic quantities has become important. In this respect the workshop was especially timely. By providing an opportunity for experts from the lattice and hadron structure communities to present their latest results, the workshop enhanced the exchange of knowledge and ideas. With a total of 32 registered participants and 26 talks, the interest of a growing community is clearly exemplified. At the workshop Schierholz and Negele presented the current status of lattice computa- tions of hadron structure. Substantial progress has been made during recent years now that the quenched results are well under control and the first dynamical results have appeared. In both the
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