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 2WF: Workshop on the Structure of Hadrons and Hypernuclei Studied by Photonuclear and Hadronic Reactions at Jlab, LEPS, and J-PARC II |
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Chair: Takashi Nakano, Research Center for Nuclear Physics, Osaka University Room: Kohala 3 |
Tuesday, October 13, 2009 2:00PM - 2:30PM |
2WF.00001: Nucleon Transition Form Factors with CLAS12 Invited Speaker: The measurements of exclusive single-meson and double-pion electroproduction cross sections off the proton to study nucleon resonances will be extended to higher momentum transfers with the CLAS12 detector and the energy upgraded CEBAF beam at JLab. Based on new theoretical developments to extract and interpret the electromagnetic transition form factors and on the experience gained from the most recent results, the newly formed collaboration of experimentalists and theorists shall enable us to provide unprecedented high-precision data, high-quality analyses, and state of the art model and QCD based calculations in a Q$^2$ domain up to 10\,GeV$^2$. For the first time nucleon resonance structures will be studied at still unexplored distance scales, where the dressed quark contributions are the dominating degrees of freedom, and where their strong interaction is responsible for the ground and excited nucleon state formations. These studies will provide promising opportunities to understand the origin of more than 98\,\% of the nucleon mass that is created by strong fields predominantly at the distance scales accessible with CLAS12. [Preview Abstract] |
Tuesday, October 13, 2009 2:30PM - 3:00PM |
2WF.00002: Baryon resonances at LEPS Invited Speaker: Backward-angle photoproductions of $\pi ^{0}$, $\eta $, $\eta $', and $\omega $ mesons have been measured in the photon energy range from 1.5 GeV to 2.4 GeV at the SPring-8/LEPS facility. Differential cross sections and photon beam asymmetries have been obtained. The cross section data show the bump structures around 2.1 GeV. The photon beam asymmetries for $\pi ^{0}$ photoproduction show a strong angular dependence. The data will be discussed connecting with baryon resonances. In addition, the future plan of experiments with photon energies up to 3 GeV will be introduced. [Preview Abstract] |
Tuesday, October 13, 2009 3:00PM - 3:30PM |
2WF.00003: Strangeness in the Proportion: strangeness in the nucleon probed via parity-violating electron scattering Invited Speaker: The contribution of strange quark/anti-quark pairs to the properties of the nucleon has been a topic of considerable interest for some time. While $s\overline{s}$ pairs are clearly observed in deep-inelastic scattering processes, and have reasonably well-determined parton distribution functions, their influence on static nucleon properties, such as the scaler, axial and vector matrix elements, is more controversial. Their contribution to the vector matrix elements, where are encoded as the strange electric and strange magnetic form factors, can be isolated using parity-violating electron scattering as a probe. Over the past 15 year or so a, program of such measurements has been underway at Jefferson Lab (HAPPEx and G0 collaborations), the MAMI microtron at Mainz (PV-A4) and MIT/Bates (SAMPLE). These have lead to a remarkably consistent picture providing rather precise values for these atrange form factors over a range of $Q^2$. The results from these experiments, and prospects for the near future, will be reviewed. [Preview Abstract] |
Tuesday, October 13, 2009 3:30PM - 4:00PM |
2WF.00004: COFFEE BREAK
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Tuesday, October 13, 2009 4:00PM - 4:30PM |
2WF.00005: Photoproductions for the study of baryon resonances Invited Speaker: Photoproduction data from the recent photon-electron facilities have been providing interesting results in the region of strangeness production. Exclusive measurement is useful for the extraction of the structure of hyperons and their resonances, in particular of their expected {\it exotic} nature. It is then desired to have a standard framework to extract such information and establish some conditions suited to the search for the interesting features. In this talk, we will make discussions in the effective Lagrangian method. We formulate the model microscopically as much as available, and attempt to extract important reaction mechanism and resonance structure from the data in such a way that the results are compared with theoretical descriptions of QCD. We discuss examples of kaon photoproductions associated with $\Lambda_{gs}$ and its resonances, and also $\phi$ photoproduction. [Preview Abstract] |
Tuesday, October 13, 2009 4:30PM - 5:00PM |
2WF.00006: Light hypernuclei and hyperon-nucleon potentials based on lattice QCD Invited Speaker: We will provide an overview of recent theoretical studies on light hypernuclei and lattice QCD hyperon-nucleon potentials. Results of ab initio calculations of s-shell hypernuclei are outlined, revealing the importance of coupled-channel such as $\Lambda N-\Sigma N$. The challenge to obtain the lattice QCD potentials will also be presented. [Preview Abstract] |
Tuesday, October 13, 2009 5:00PM - 5:30PM |
2WF.00007: Hadronic Physics at J-PARC Invited Speaker: J-PARC, Japan Proton Accelerator Research Complex, has just finished its 1$^{st}$ phase construction, and got the 1$^{st}$ beams at the experimental facilities. Among the experimental facilities, such as the Materials and Life Science Experimental Facility and the Neutrino Experimental Facility, the Hadron Experimental Facility is for fixed target experiments which utilize the secondary beams produced by the proton beam slowly extracted from the 50-GeV synchrotron. At the Hadron Facility, the K1.8BR beam line, for secondary beams (pi, K, ...) up to 1.1 GeV/c, is already available, and the K1.8 beam line, for secondary beams up to 1.8 GeV/c, will be ready by the end of October, 2009. The neutral kaon beam line, KL, is also under construction and will be tested in this fall. Other beam lines, such as K1.1BR (for secondary beam up to 0.8 GeV/c), K1.1 (up to 1.1 GeV/c), and high-momentum beam line (low intensity primary protons and high momentum unseparated secondary beams), are in preparation. Among many experiments proposed so far (http://j-parc.jp/NuclPart/Proposal{\_}e.html), some nuclear/hadron physics experiments as well as particle physics experiments are being conducted at these beam lines. In this talk, hadron physics experiments at the Hadron Experimental Facility of J-PARC are introduced with a review of their predecessors. In addition, a summary will be presented on the discussions related to J-PARC during the previous two days of the US-Japan seminar titled ``Meson Production Reactions at Jefferson Lab and J-PARC.'' [Preview Abstract] |
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