MENU 2016

Session

Meson-Nucleon Interactions

26 Jul 2016, 14:15

2F Hall I (Clock Tower Centennial Hall, Kyoto University)

Conveners

Meson-Nucleon Interactions: A-4 / 26-mni-2

• Satoshi Yokkaichi

Meson-Nucleon Interactions: A-1 / 26-mni-1

• Fuminori Sakuma

Meson-Nucleon Interactions: B-5 / 26-mni-3

• Takatsugu Ishikawa

Meson-Nucleon Interactions: C-1 / 27-mni-4

• Tetsuo Hyodo

Meson-Nucleon Interactions: D-4 / 29-mni-5

• Hideko Nagahiro

Meson-Nucleon Interactions: E-1 / 29-mni-6

• Hiroyuki Noumi

97. The phi meson in nuclear matter and the strangeness content of the nucleon

Philipp Gubler (ECT*)

26/07/2016, 14:15

In this presentation, recent results about the behavior of the phi meson in nuclear matter will be presented [1,2,3]. Furthermore, the relation between the phi meson spectral function and QCD condensates, in particular the strange quark condensate, will be discussed. We find a strong correlation between a possible mass shift of the phi-meson in nuclear matter and the strangeness content of the...

19. The “K-pp” system investigated with a coupled-channel Complex Scaling Method

Akinobu Dote (KEK Theory Center)

26/07/2016, 14:15

In mesic nuclei, kaonic nuclei have been a hot topic for a decade. Due to so strong KbarN attraction that generates a hyperon resonance Lambda(1405), kaonic nuclei could have various interesting properties, in particular to form a dense matter. To clarify exotic nature caused by anti-kaons, the most essential kaonic nucleus “K-pp” has been studied eagerly from both theoretical and experimental...

20. Recent result of an exclusive measurement of 3He(K-, Λp)n reaction to search for KbarNN bound state at J-PARC

Takumi Yamaga (Osaka university)

26/07/2016, 14:50

As a consequence of the attractive KbarN interaction, kaonic nuclei which is bound state of anti-kaon and nucleon has been widely discussed. All theoretical studies support the existence of kaonic nuclei, however, its energy and width are widely spread depending on energy dependence of the KbarN interaction model. The investigation of such bound state would help us to understand the KbarN...

98. Systematic study of the vector meson spectral modification in the nuclear medium at J-PARC

Yusuke Komatsu (RIKEN)

26/07/2016, 14:50

The spontaneous breaking of chiral symmetry is considered to be the origin of hadron mass. An order parameter of chiral symmetry breaking is a quark anti-quark condensate, but it is not observable. Instead, the spectral function of vector mesons is predicted to be changed in a hot and/or dense medium through the restoration of chiral symmetry. The J-PARC E16 experiment is proposed to study the...

22. On the structure observed in the in-flight 3He (K^- , Lambda p) n reaction at J-PARC

Takayasu Sekihara (Advanced Science Research Center, JAEA)

26/07/2016, 15:20

Recently, a peak structure was observed near the K^- p p threshold in the in-flight 3He (K^- , Lambda p) n reaction of the E15 experiment at J-PARC. This peak could be a signal of the lightest kaonic nuclei, that is, the Kbar N N (I=1/2) state, which has been intensively studied both experimentally and theoretically in the last decade. In this contribution we theoretically investigate what is...

99. Phi mesons in cold nuclear matter with chirally-based resonant phi-N interactions

Astrid Hiller Blin (IFIC/CSIC/Universidad de Valencia)

26/07/2016, 15:20

The phi-meson properties in cold nuclear matter are revisited by implementing resonant phi-N interactions as described in chirally-based approaches including the unitarization of scattering amplitudes. Several N*-like states are dynamically generated in these models around 2 GeV, immediately above the phi N threshold. We find that these states give a sizable contribution to the phi collisional...

100. Dilepton results from HADES using Au+Au data at 1.23 AGeV

Celso Franco (LIP-Lisbon)

26/07/2016, 15:50

The HADES experiment at GSI was designed to investigate the properties of hadrons inside dense nuclear matter. The latter is created in heavy-ion collisions at energies of 1-2 AGeV. HADES is currently the only running experiment that studies the region in the QCD phase diagram of very high net-baryon densities and low temperatures. Similar conditions are also present in one of the most...

25. Study of the Kbar-nucleus interaction by using the 12C(K-, p) reaction at J-PARC

Yudai Ichikawa (Japan Atomic Energy Agency)

26/07/2016, 15:50

An interaction between Kbar and nucleus is studied by using the X-ray from the kaonic atoms for a long time. However, it is difficult to determine the Kbar-nucleus interaction by using only kaonic-atoms data because the value of shift and width of the X-ray depend not only the potential depth but also the type of theoretical model. Thus, we study the Kbar-nucleus interaction by comparing an...

58. Interference effect between ϕ and Λ(1520) production channels in the γp→K+K-p reaction near threshold

Sun Young Ryu (Research Center for Nuclear Physics, Osaka University)

26/07/2016, 16:50

The $\varphi$-$\mathrm{\Lambda }(1520)$ interference effect in the $\gamma p\to K^{+}{K}^{-}p$ reaction has been measured for the first time in the energy range from 1.673 to 2.173 GeV at LEPS/SPring-8. The relative phases between $\varphi$ and $\mathrm{\Lambda }(1520)$ production amplitudes were obtained in the kinematic region where the two resonances overlap. The measurement results support strong constructive...

60. Status and prospects of LEPS2 solenoid spectrometer

Masayuki Niiyama (Kyoto Univ.)

26/07/2016, 17:20

A high intensity GeV gamma beam line, LEPS2, was constructed at SPring-8 in Japan in 2013. The LEPS2 beam line provides a highly polarized photon beam up to 3 GeV with one order higher intensity than that of LEPS1 facility. We are constructing a 4$\pi$ solenoidal spectrometer which can detect both of charged particles and photons. The LEPS2 solenoid spectrometer consists of a time projection...

62. On the near-threshold incoherent $\varphi$ photoproduction on the deuteron: any trace of a resonance?

Alvin Kiswandhi (Department of Physics, STKIP Surya)

26/07/2016, 17:50

We study the near-threshold incoherent $\varphi$ photoproduction on the deuteron based on a model of $\gamma N\to \varphi N$, consisting of Pomeron, $(\pi ,\eta )$ exchanges, and a $J^P=3/2^{-}$ resonance, which describes the low energy \gamma p \to \phi p$ LEPS data well, including the peak in the forward differential cross section. The calculation is done up to double rescatterings, with the spin...

21. Exotic baryons as a hadronic molecule in the heavy quark region

Yasuhiro Yamaguchi (INFN Genova)

27/07/2016, 14:15

In the hadron spectroscopy in the heavy quark region, new symmetry plays an important role. The symmetry is the heavy quark spin symmetry. It manifests the mass degeneracy of the states with different total spin, e.g. degeneracies of $D$ and $D^{\ast }$ mesons and ${\mathrm{\Sigma }}_c$ and ${\mathrm{\Sigma }}_c^{\ast }$ baryons. It is important to generate the exotic hadron structures found in the heavy quark region. The...

23. PERSPECTIVE STUDY OF CHRMONIUM, EXOTICS AND BARYONS WITH CHARM AND STRANGENESS

Mikhail Barabanov (JINR)

27/07/2016, 14:50

The spectroscopy of charmonium-like states together with the spectroscopy of charmed and strange baryons is discussed. It is a good testing tool for the theories of strong interactions, including: QCD in both the perturbative and non-perturbative regimes, LQCD, potential models and phenomenological models [1, 2, 3]. An understanding of the baryon spectrum is one of the primary goals of...

26. 1+1 large N_c QCD and its holographic dual

Hideo Suganuma (Kyoto Univ.)

27/07/2016, 15:20

Large N_c QCD in 1+3 dimensional spacetime can be converted into its holographic dual model via gauge/gravity correspondence (called the Sakai-Sugimoto model or holographic QCD)[1]. This QCD-based model well reproduces the mass spectrum of mesons, and also explains many properties of hadron phenomenology such as anomalies, the vector meson dominance, and the Skryme model. In this paper, we...

24. A study of the H-dibaryon in holographic QCD

Kohei Matsumoto (Kyoto University)

27/07/2016, 15:50

We investigate the H-dibaryon (uuddss) in holographic QCD [1, 2]. Holographic QCD is derived from a QCD-equivalent D-brane system in the superstring theory via the gauge/gravity correspondence. In holographic QCD, all baryons appear as topological chiral solitons of Nambu-Goldstone bosons and (axial) vector mesons [1, 2]. In this framework, the H-dibaryon can be described as an SO(3)-type...

69. Precision spectroscopy of deeply bound pionic states in 121, 116Sn

Takahiro Nishi (RIKEN Nishina center)

29/07/2016, 14:15

We report our recent experiment of the pionic 121, 116Sn atom using missing-mass spectroscopy of the 122, 117Sn(d, 3He) reaction near the charged pion emission threshold. An established approach for quantitative evaluation of the chiral symmetry breaking in finite density is study of pion-nucleus interaction through the experimental measurement of pionic atoms. So far the 1s pionic states in...

71. Spectroscopy of pionic atoms via (p, 2He) reaction

Yuni Watanabe (University of Tokyo)

29/07/2016, 14:45

Spectroscopy of pionic atoms enables us to investigate partial restoration of chiral symmetry at finite density.It is theoretically known that the isovector potential parameter of parameter of the pion-nucleus interaction is related to the chiral condensate.Past experiments with the (d,3He) reaction at GSI showed an evidence of partial restoration of chiral symmetry. For the further study of...

72. Formation of deeply bound pionic atoms and pion properties in nuclei

Natsumi Ikeno (Tottori University)

29/07/2016, 15:15

We study theoretically the formation of deeply bound pionic atoms to deduce precisely the pion properties in nuclei from the observables. It is important to know the pion properties in nuclei since they are believed to provide valuable information on the aspects of the symmetry of strong interaction at finite density. In this presentation, we show the theoretical formation spectra of deeply...

74. Study of the d(γ, K+)ΣπN reaction at LEPS

Atsushi Tokiyasu (Tohoku Univeristy)

29/07/2016, 16:50

The production mechanism of a \Sigma \pi pair from a deuteron target gives us an essential information on the interaction between \Lambda(1405) and nucleon. J-PARC E27 group studied the d(\pi+, K+)X reaction, and reported a large mass shift in the hyperon resonance region. Checking the spectrum using the other reaction is helpful to reveal the source of the large shift. We measured the...

75. Spectroscopic experiment of Λ(1405) via in-flight d(K-n) reaction at J-PARC K1.8BR

Shingo Kawasaki (RCNP)

29/07/2016, 17:20

Λ(1405) is the lightest among negative parity baryon excitation states, which is hardly explained by a simple quark model. Since the Λ(1405) is located just below the KbarN threshold, there is a longstanding argument if it is a KbarN bound state. A chiral unitary model claims that the Λ(1405) consists of two states (KbarN state and Σπ state). According to the model, a pole position of the...

77. Construction and application of the KbarN local potential based on chiral unitary approach

Kenta Miyahara (Kyoto university)

29/07/2016, 17:50

Aiming at quantitative studies of Kbar nuclei, we construct the reliable KbarN local potential. Based on the chiral coupled-channel approach, the chiral unitary approach, we establish a new construction method which respects the behavior of the scattering amplitude in the complex energy plane. This method is employed to the recent experimental data of the energy shift of the kaonic hydrogen by...

79. $\yen barKN$ interaction in the Skyrme model

Takashi Ezoe (RCNP, Osaka university)

29/07/2016, 18:20

We study the $\yen barKN$ system in the Skyrme model in a method based on the bound state approach of Callan-Klebanov but with the kaon around the physical nucleon of the rotating hedgehog. This corresponds to the variation after projection which is opposite to the variation before projection. The new method is considered to be more suited to the study of the weakly interacting $\yen barKN$...