Bulletin of the American Physical Society
2006 Division of Nuclear Physics Annual Meeting
Wednesday–Saturday, October 25–28, 2006; Nashville, Tennessee
Session AA: Future Directions in Nuclear Physics |
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Sponsoring Units: DNP Chair: Susan Seestrom, Los Alamos National Laboratory Room: Gaylord Opryland Tennessee C |
Thursday, October 26, 2006 8:30AM - 8:40AM |
AA.00001: Welcome |
Thursday, October 26, 2006 8:40AM - 9:15AM |
AA.00002: Fundamental Investigations in QCD Invited Speaker: Quantum Chromodynamics is both an integral part of the Standard Model and the archetype for nature's non-Abelian gauge theories. The running coupling constant of QCD allows (requires) the theory to be studied in both the perturbative and the non-perturbative regime. Strongly interacting matter is predicted to have a rich phase structure, which is of particular interest in that QCD is the only fundamental theory with a phase transition that is currently accessible to direct experimental investigation. The intrinsically non-Abelian nature of QCD also leads to intriguing predictions of essentially classical fields in heavy nuclei at low momentum fraction. In addition, seemingly straightforward theoretical questions such as the origin of the proton's spin remain only partially addressed because of complications arising from the strength of the interaction. Answers to those questions will depend on additional experimental measurements to quantify the contributions of the gluons and the sea to the nucleon's spin. The opportunities to explore the rich structure of QCD at existing and future facilities will be presented, the current understanding of recent data will be reviewed, and the emerging connections of QCD to other fields of physics will be discussed. [Preview Abstract] |
Thursday, October 26, 2006 9:15AM - 9:50AM |
AA.00003: The JLab Physics Program Today and with the 12 GeV Upgrade Invited Speaker: JLab is bringing about a new and deeper understanding of nuclear matter, and with the 12 GeV upgrade, qualitatively new possibilities will open. JLab has accomplished many of its original goals, including exploring the transition between the nucleon/ meson and quark/gluon regimes and a substantially improved understanding of the strong force. There have also been important discoveries. Precision studies of elastic scattering have shown an unanticipated $Q^2$ dependence of the ratio $G_E^p/G_M^p$, a result that has underscored the importance of quark orbital angular momentum (OAM). The role of OAM appears to be critical for understanding other results as well, including data from both inclusive and semi-inclusive deep inelastic scattering (DIS). An important theoretical achievement has been the development of generalized parton distributions (GPD’s), which among other things, make it possible to understand both elastic and inelastic processes under a single theoretical framework. GPD's are already being probed at JLab, and after the upgrade, it will become possible to do what is essentially tomography of the nucleon. Another important probe in electron scattering is the study of parity violating spin asymmetries. Experiments have already used parity violation (PV) to probe the role of strange quarks in the nucleon, and both precision electroweak tests as well as studies of the properties of neutron matter are planned. At 12 GeV, the study of PV in DIS will provide new information on both hadronic and electroweak physics. Finally, of great importance at 12 GeV will be the GlueX experiment that will search for new exotic hybrid mesons. Predicted to exist because of excitations of gluonic flux tubes, the discovery of these mesons might well provide the most definitive probe to date of the glue that makes up a large fraction of the nucleon’s mass. [Preview Abstract] |
Thursday, October 26, 2006 9:50AM - 10:25AM |
AA.00004: Towards a Deeper Understanding of the Nucleus with Exotic Nuclei Invited Speaker: Despite more than fifty years of study, many questions about now nuclei are put together remain. While nuclei near the valley of stability have provided a wealth of information, they are not sufficient to provide us with a comprehensive and unified description of the nucleus. Especially lacking is an accurate picture of those exotic species that are the basis of cosmic alchemy. The missing pieces in the puzzle can be filled in with a determined experimental and theoretical effort focusing on nuclei lying far from the valley of stability. Here, I will outline the intellectual challenges that can be addressed by proposed exotic-beam facilities, and how new experimental data will quide and refine theoretical descriptions of the nucleus. [Preview Abstract] |
Thursday, October 26, 2006 10:25AM - 11:00AM |
AA.00005: Coffee Break
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Thursday, October 26, 2006 11:00AM - 11:35AM |
AA.00006: How nuclear physics is helping us get beyond the Standard Model. Invited Speaker: Nuclear physics experiments were instrumental in establishing the elements of the weak interaction that are incorporated into the Standard Model. After decades of scrutiny there are now substantial indications that require important Standard Model revisions. Nuclear physics continues to play a key role. I will discuss some new results and some of the key discoveries that may be just around the corner. [Preview Abstract] |
Thursday, October 26, 2006 11:35AM - 11:45AM |
AA.00007: Long Range Plan Introduction S. Seestrom |
Thursday, October 26, 2006 11:45AM - 12:05PM |
AA.00008: Long Range Plan Overview R. Tribble |
Thursday, October 26, 2006 12:05PM - 12:55PM |
AA.00009: Long Range Plan Discussion |
Thursday, October 26, 2006 12:55PM - 1:00PM |
AA.00010: Closing Remarks S. Seestrom |
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