Bulletin of the American Physical Society
5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 63, Number 12
Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii
Session CK: Hadron Spectroscopy with Electron, Photon, and Hadron Beams I |
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Chair: Masashi Kaneta, Tohoku University Room: Hilton Queen's 4 |
Wednesday, October 24, 2018 7:00PM - 7:30PM |
CK.00001: Recent results and future prospects for electro- and photoproduction of strangeness Invited Speaker: Brian O Beckford Investigation of strangeness production continues to be studied both theoretically and experimentally. Electro and photoproduction of associated strangeness from nucleons provides information on strengths of couplings constants, hadron form-factors, and will be critical to resolving questions regarding (QCD) predicted resonances yet to be experimentally observed, and about exotic particles containing multi-strangeness as recently discussed by lattice QCD for dibaryons. Additionally, it also provides a means to study the baryon resonance spectrum and hyperon-nucleon interactions. Some in operation and proposed experiments use electron, or real and virtual photon beams, at laboratories such as JLab, ELPH, LEPS/LEPS2, MAMI, and ELSA. Large high-quality data have been reported from the SAPHIR, LEPS, GRAAL, and CLAS collaborations. Smaller photoproduction data sets have been reported by the NKS collaboration. The results from these collaborations are instrumental in a resurgence of theoretical studies. This talk will discuss progress and results in recent data including some differential and total cross-sections and polarization observables and briefly outline future prospects. |
Wednesday, October 24, 2018 7:30PM - 7:45PM |
CK.00002: A study of Lambda-Nucleon scattering using the CLAS detector Joseph Rowley, Kenneth H Hicks, John W Price Current data for the elastic scattering of Lambda hyperons from the nucleon |
Wednesday, October 24, 2018 7:45PM - 8:00PM |
CK.00003: The N&[Omega] interaction: meson exchanges, inelastic channels, and quasibound state Takayasu Sekihara, Yuki Kamiya, Tetsuo Hyodo Based on a baryon-baryon interaction model with meson exchanges, we investigate the origin of the strong attraction in the NΩ(5S2) interaction, which was indicated by recent lattice QCD simulations. The long range part of the potential is constructed by the conventional mechanisms, the exchanges of the η meson and of the correlated two mesons in the scalar-isoscalar channel, denoted by "σ" in the literature. The short range part is represented by the contact interaction. We find that the meson |
Wednesday, October 24, 2018 8:00PM - 8:15PM |
CK.00004: Lattice QCD study on the strangeness -2 baryonic states Kenji Sasaki We investigate baryon-baryon (BB) interactions via the time-dependent HAL QCD method which enables us to derive potentials from Nambu-Bethe-Salpeter (NBS) wave function simulated on the lattice. |
Wednesday, October 24, 2018 8:15PM - 8:30PM |
CK.00005: Studying the hyperon-nucleon interaction through final-state interactions in exclusive $\Lambda$ photoproduction off the Deuteron Nicholas Zachariou
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Wednesday, October 24, 2018 8:30PM - 8:45PM |
CK.00006: Search for a new narrow Lambda* resonance near the Lambda eta threshold at J-PARC Kiyoshi Tanida Evidence for a narrow $\Lambda^*$ resonance at a mass of about 1665 MeV (just above the combined mass of the $\Lambda$ ground state plus the $\eta$ meson) has been seen in the $M(pK^-)$ mass of the Dalitz plot for $\Lambda_c \to pK^-\pi^+$ decay at the Belle experiment. Additional evidence for this resonance is found in the partial-wave analysis (PWA) of data on $K^- p$ reactions done independently by several groups, driven by angular distributions of the $K^- p \to \Lambda\eta$ reaction by the Crystal Ball collaboration. If a narrow $\Lambda^*$ resonance exists at this mass, then the conventional quark model cannot explain it, and a possible explanation is that it is a crypto-exotic baryon with a dominant meson-baryon component to its wave function. |
Wednesday, October 24, 2018 8:45PM - 9:00PM |
CK.00007: $\pi\Sigma$ Spectra in the Kaon-Induced Reaction on Deuteron Hiroyuki Noumi $\Lambda(1405)$ is a hyperon resonance with a spin-parity of $1/2^-$, located just below the $\bar{K}N$ mass. There is a longstanding question if $\Lambda(1405)$ is a $\bar{K}N$ molecular state [1]. We carried out an experiment to observe missing mass spectra of $\pi^{\pm,0}\Sigma^{\mp,0}$ in the $K^-d\rightarrow n{\pi^{\pm,0}\Sigma^{\mp,0}}$ reactions at the J-PARC K1.8BR beam line [2]. A kaon beam of 1 GeV/$c$ was irradiated on a deuterium target. A neutron scattered at a very forward angle off deuteron was detected. A recoiled $\bar{K}$ is expected to react with a residual nucleon. An S-wave $\bar{K}N\rightarrow\pi\Sigma$ scattering is expected to be dominant since the recoiled momentum of $\bar{K}$ is as low as $\sim$250 MeV/$c$. In particular, the scattering process can take place even below the $\bar{K}N$ mass threshold. Therefore, we could access $\Lambda(1405)$ directly though the scattering process. We will present and discuss line shapes of the $\pi\Sigma$ spectra around the $\bar{K}N$ mass threshold in relation to the nature of $\Lambda(1405)$. Reference
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Wednesday, October 24, 2018 9:00PM - 9:15PM |
CK.00008: J/ψ Photoproduction near threshold with CLAS12 Joseph Newton One of the objectives of nuclear physics is to understand how quarks and gluons interact to form a hadron. For decades, electron scattering has been used to study the distribution of charge and magnetization in the nucleon. Even though electric and magnetic form factors have been measured, experimental study of the gluonic form factor of the proton is lacking. With available beam energies up to 11 GeV from CEBAF at Jefferson Lab, the CLAS12 detector is well suited to study J/ψ photoproduction near threshold. The reaction (γ p -> l+l-p') will be studied in the untagged photoproduction regime. In this talk, we present the first look at the data collected during the first physics run of CLAS12 with a 10.6 GeV electron beam impinging on a liquid Hydrogen target. Analysis details will be discussed, including particle identification and event selection for quasi-real photoproduction. |
Wednesday, October 24, 2018 9:15PM - 9:30PM |
CK.00009: Search for Hidden-Charm Pentaquark with CLAS12 Valery Kubarovsky LHCb recently announced the discovery of two exotic structures in the J/ψ+p decay channel, which have been referred to as charmonium-pentaquark states. Resolving differences between models for these states, clarifying the nature of the discovered hidden-charm pentaquark peaks, and discovery of any similar states with other quantum numbers, will require further experimental studies. It is natural to expect that such pentaquark states should be produced in the photoproduction process γ+p-> Pc -> J/ψ+p, where they will appear as s-channel resonances at photon energy around 10 GeV. The energy and luminosity of the Jefferson Lab CLAS12 photon beam will permit detailed studies of the production and decay properties of such pentaquark resonances. This presentation will discuss a search for these pentaquark states which is currently underway with CLAS12. |
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