Bulletin of the American Physical Society
2005 2nd Joint Meeting of the Nuclear Physics Divisions of the APS and The Physical Society of Japan
Sunday–Thursday, September 18–22, 2005; Maui, Hawaii
Session 2WA: Workshop 1B: Nuclear/Hadron Physics at the JLAB and J-PARC |
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Sponsoring Units: DNP JPS Chair: Shin'ya Sawada, KEK Room: Ritz-Carlton Hotel Salon 4 |
Sunday, September 18, 2005 2:00PM - 2:30PM |
2WA.00001: Hypernuclear physics at KEK and J-PARC Invited Speaker: Recent results on hypernuclear physics obtained at the 12-GeV proton synchrotron of KEK are reviewed, and the future experimental programs at J-PARC are discussed in this talk. The first part includes the results on hypernuclear gamma-ray spectroscopy with the HyperBall detector, weak decays of light lambda hypernuclei, production of a neutron-rich lambda hypernucleus, hyperon-proton scattering, and production of a double-lambda hypernucleus. The J-PARC facility has been in construction since 2001 at Tokai, Japan. The highest intensity Kaon beams will be available at an experimental hall in the summer of 2008. Various interesting experiments are proposed so far. Two of them are considered to be the Day-1 experiments. One is the new-generation spectroscopy of hadron many-body systems with strangeness -2 and -1, and the other is a search for deeply-bound Kaonic nuclear systems. These experiments together with other interesting ideas will be discussed. [Preview Abstract] |
Sunday, September 18, 2005 2:30PM - 3:00PM |
2WA.00002: Kaonic nuclei -- dense and cold nuclear systems Invited Speaker: We have predicted strongly bound kaonic states in few-body nuclei, the bindings of which are on the order of 100 MeV: the separation energies of a $K^{-}$ in $^{3}$He and $^{4}$He are calculated to be 108 and 86 MeV with widths of 20 and 34 MeV, respectively. Substantial contraction of the system is induced due to the strong \textit{KN} attraction, thus forming an unusually-dense nuclear object. Since these kaonic nuclei have large densities more than 3-times the normal density, they provide a unique playground for studying possible QCD structure in dense and cold nuclear medium. We discuss the implication of recently discovered strange tri-baryons in $^{4}$He(stopped-$K^{-}$, $p)$S$^{0 }$(3115) and $^{4}$He(stopped-$K^{-}$, $n)$ S$^{+}$ (3140) within the framework of deeply bound Kaonic states formed on shrunk nuclear cores. The S$^{+}$ (3140) corresponds to $T$=0 \textit{ppnK}$^{-}$, whereas the S$^{0 }$(3115) to $T$=1 \textit{pnnK}$^{-}$, which is an isobaric analog state of \textit{pppK}$^{-}$. The observed binding energies can be accounted for by including the relativistic effect and by invoking a medium-enhanced \textit{KN} interaction by 15{\%}. A new paradigm is discussed, which would be closely related to important issues of ``chiral symmetry restoration,'' ``kaon condensation'' and ``strange matter.'' [Preview Abstract] |
Sunday, September 18, 2005 3:00PM - 3:30PM |
2WA.00003: Probing Hadron Structure with High Energy Proton Beams Invited Speaker: The history of probing hadronic structure with proton beams is long and rich. Results from just one experiment that used an 800 GeV proton beam, FNAL E866/NuSea, have provided new insight into the composition of the nucleon sea, the partonic structure at high Bjorken-x, an upper limit on parton energy loss in cold nuclear matter, and more. Two similar experiments have been proposed at lower energies. FNAL E906 has been approved to run using the 120 GeV beam from the Fermilab Main Injector. The lower beam energy will yield more Drell-Yan events and extend the kinematical coverage to higher x values. A Letter of Intend has been submitted to J-PARC to perform the measurement using the 50 GeV proton beam. This will overlap with the E906 measurement and extend to even higher x values. The lower beam energy will also aid in the measurement of energy loss in cold nuclear matter. If a polarized proton beam were available at J-PARC in the future, then a polarized Drell-Yan measurement would be possible. I will highlight the results from FNAL E866/NuSea and discuss future plans for both E906 at FNAL and the LOI at J-PARC. [Preview Abstract] |
Sunday, September 18, 2005 3:30PM - 4:00PM |
2WA.00004: Future Hadronic Spectroscopy at JLAB and J-PARC Invited Speaker: Hadronic spectroscopy data provide crucial information about QCD in the nonperturbative regime. One important issue concerns how many internal degrees of freedom are really needed to describe baryon resonances. Essentially all of the known baryon resonances can be described as quark-diquark states, whereas quark models predict a much richer spectrum than observed experimentally involving three dynamical quark degrees of freedom. It is important to confirm whether these ``missing states'' exist. A related question concerns whether there are exotics and hybrid mesons and baryons, and if so, what are their spectra. Some of these questions might be answered by future experiments at JLAB and J-PARC. My talk will focus mainly on the prospect of making dramatic improvements in our knowledge of hyperon resonances, which could be studied by production and/or formation mechanisms at these two facilities. [Preview Abstract] |
Sunday, September 18, 2005 4:00PM - 4:30PM |
2WA.00005: $\lambda$-Nucleus Studies as JPARC Invited Speaker: This abstract has not been submitted yet. [Preview Abstract] |
Sunday, September 18, 2005 4:30PM - 5:00PM |
2WA.00006: J-PARC facility and physics opportunities Invited Speaker: J-PARC project is now in the fifth year of its construction. It will provide high-power protons at (1) 3 GeV for the usage spallation neutrons and muons and 2) 50 GeV for the usage of kaons and neutrinos. From JFY2004 the neutrino program has been officially approved for construction. The total budget is over 1,500 Oku Yen for Phase 1 project of the J-PARC. According to the present plan, the first beams will be available in 2008. In this talk, I will present a) current status of the project, b) plans for Day-1, c) plans beyond Day-1, and d) major issues that have to be solved now. [Preview Abstract] |
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