Bulletin of the American Physical Society
3rd Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 54, Number 10
Tuesday–Saturday, October 13–17, 2009; Waikoloa, Hawaii
Session 1WF: Workshop on the Structure of Hadrons and Hypernuclei Studied by Photonuclear and Hadronic Reactions at Jlab, LEPS, and J-PARC I |
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Chair: David Tedeschi, University of South Carolina Room: Kohala 3 |
Tuesday, October 13, 2009 9:00AM - 9:30AM |
1WF.00001: Strangeness in Hadronic and Nuclear Systems Invited Speaker: The strange quark presents many challenges and opportunities in modern nuclear physics. We first review some modern aspects of the spectroscopy of baryons involving a strange quark. In terms of baryon spectroscopy there are far less $\Sigma $ and $\Xi $ states established experimentally than are expected within quark models. Coupled with this, lattice QCD is currently better suited to studying the spectroscopy of excited hyperons than nucleons because of the heavier mass of the strange quark. This opens the possibility that lattice might actually be able to predict some states before they can be measured. We also review some remarkable recent progress in the understanding of the energies of hypernuclei starting at the quark level. One can very naturally understand the absence of $\Sigma$ hypernuclei, the very small spin-orbit force in $\Lambda$ hypernuclei and the binding energies of many $\Lambda$ hypernuclei as well as predicting the binding energies of $\Xi$ hypernuclei. The relevance of these phenomena to the properties of dense matter will also be discussed. [Preview Abstract] |
Tuesday, October 13, 2009 9:30AM - 10:00AM |
1WF.00002: Studies of the Nucleon Structure at Jefferson Lab Invited Speaker: The JLab 6 GeV electron beam has been used to study the nucleon's internal structure in the transition from the regime of strongly interacting quarks and gluons to the deep inelastic regime of quasi-free interactions. Elastic and inelastic electron scattering, including the measurement of polarization observables, has led to deeper insight into the complex spatial and spin structure of the nucleon. In this talk, I will discuss results on the electromagnetic nucleon elastic form factors and on nucleon resonance transition form factors of several excited states of the proton. I will also present recent measurements of the spin responses of protons and neutrons in inclusive and exclusive electro production processes. Finally, I will discuss the prospects of probing generalized parton distributions (GPDs) in measurement of processes such as deeply virtual Compton scattering, both with the current 6 GeV machine, as well as at the higher energies available after the JLab 12 GeV upgrade. [Preview Abstract] |
Tuesday, October 13, 2009 10:00AM - 10:30AM |
1WF.00003: Hadronic Physics at LEPS/SPring-8 Invited Speaker: At the Laser Electron Photon facility at SPring-8 (LEPS), highly polarized photon beams in the energy range from 1.5 to 3.0 GeV are used for studying hadronic physics. The beams are produced by Compton scattering of laser photons from 8-GeV electrons in the SPring-8 storage ring synchrotron radiation source. The main detector setup has been a charged-particle spectrometer with a dipole magnet in the forward direction. We recently extended our kinematical coverage by adding a time projection chamber (TPC) surrounding the target. We have been studying various meson/baryon photoproduction reactions, including searching for the exotics such as $\Theta^{+}$ pentaquark. For further upgrade of the beam and the detector, by constructing a new beamline at SPring-8, the LEPS2 project has been proposed. In this talk, recent results from the LEPS experiment are overviewed and future prospects are discussed. [Preview Abstract] |
Tuesday, October 13, 2009 10:30AM - 11:00AM |
1WF.00004: COFFEE BREAK
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Tuesday, October 13, 2009 11:00AM - 11:30AM |
1WF.00005: Hypernuclear and Strange Quark Programs in Jefferson Lab Halls A and C Invited Speaker: The first several generations of experiments on hypernuclei and strange quark production have been completed in Jeffeson Lab's Halls A and C. I will present a summary of the program showing the primary results. The wide range of results from the program has changed our understanding of both hypernuclei and strange quark electro- and photo-production. The results show that the elementary reaction is dominated by t-channel at forward angles for production of the Lambda, while s-channel dominates Sigma production. The Longitudinal response is large (approximately 50\% of the Transverse), suggesting that these experiments can constrain models for the kaon form factor. On nuclear targets, good signal-to-noise ratios have been achieved with unprecedented resolutions. The reaction produces mirror nuclei to production with hadronic beams, and importantly determines the binding energies. Additionally, for the first time excited core states have been observed allowing tests of hypernuclear potentials and production models. [Preview Abstract] |
Tuesday, October 13, 2009 11:30AM - 12:00PM |
1WF.00006: Hypernuclear Study with Hadronic Reactions, from AGS/KEK-PS to J-PARC Invited Speaker: I will overview the hypernuclear experiments with meson beams at BNL-AGS and KEK-PS, which have been carried out with strong collaboration between US and Japan. The talk will start with the S = -1 physics; Lambda-hypernuclear spectroscopy, Sigma hypernucleus search, weak decay of the Lambda hypernuclei, gamma-ray spectroscopy of the Lambda hypernuclei, production of the neutron-rich Lambda hypernucleus, and also cover the S = -2 physics; search for H-dibaryon, double-Lambda hypernuclear studies, and so on. Many of these experiments will continue at J-PARC with upgraded experimental equipments and conditions, which will be discussed in detail by Nagae at the plenary talk. [Preview Abstract] |
Tuesday, October 13, 2009 12:00PM - 12:30PM |
1WF.00007: Baryon resonance studies via meson photoproduction at CLAS Invited Speaker: The CLAS Collaboration has been investigating the formation of baryon resonances in photoproduction processes for several years using the CEBAF Large Acceptance Spectrometer in Hall B at Jefferson Lab. Differential cross section data for pseudoscalar and vector mesons have been obtained with unprecedented statistics. Recently, the focus has been shifted towards the extraction of polarization observables using circularly and linearly polarized beams and frozen-spin targets. Preliminary cross section and polarization data will be presented as well as results from partial wave analyses and model calculations discussed with regard to the extraction of s-channel contributions. [Preview Abstract] |
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