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Journal Articles

Charmed dibaryon resonances in the potential quark model

Oka, Makoto; Maeda, Saori*; Liu, Y.-R.*

International Journal of Modern Physics; Conference Series (Internet), 49, p.1960004_1 - 1960004_8, 2019/07

 Times Cited Count:4 Percentile:96.72

The charmed dibaryon resonances are given by a model Hamiltonian with the quark-model based short-range interaction and the long-range meson-exchange interactions. Sharp resonances states below the $$Sigma_{c}$$-$$N$$ and $$Sigma_{c}^{*}$$-$$N$$ thresholds are predicted.

Journal Articles

Resonance states in the $$Y_cN$$ potential model

Maeda, Saori*; Oka, Makoto; Liu, Y.-R.*

Physical Review C, 98(3), p.035203_1 - 035203_9, 2018/09

 Times Cited Count:9 Percentile:76.63(Physics, Nuclear)

We calculate two-body $$J^{pi}=0^{+}, 1^{+}$$, and $$J^{pi}=2^{+}$$ resonance states of $$Y_{c}$$ ($$= Lambda_{c}$$, $$Sigma_{c}$$, or $$Sigma_{c}^{*}$$) and $$N$$ using the complex scaling method. We employ the $$Y_{c}N$$-CTNN potentials, which were proposed in our previous study, and obtain four resonances near $$Sigma_{c}N$$ and $$Sigma_{c}^{*}N$$ thresholds. From the analysis by the binding energies of partial channel systems, we conclude that these resonance states are Feshbach resonances. We compare the results with the $$Y_{c}N$$ resonance states in the heavy quark limit, where the $$Sigma_{c}N$$ and $$Sigma_{c}^{*}N$$ thresholds are degenerate, and find that they form two pairs of the heavy-quark doublets in agreement with the heavy quark spin symmetry.

Journal Articles

Exotic hadrons from heavy ion collisions

Cho, S.*; Hyodo, Tetsuo*; Jido, Daisuke*; Ko, C. M.*; Lee, S. H.*; Maeda, Saori*; Miyahara, Kenta*; Morita, Kenji*; Nielsen, M.*; Onishi, Akira*; et al.

Progress in Particle and Nuclear Physics, 95, p.279 - 322, 2017/07

AA2016-0538.pdf:0.65MB

 Times Cited Count:54 Percentile:86.05(Physics, Nuclear)

With upgraded detectors at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC), it has become possible to measure hadrons beyond their ground states in high energy heavy ion collisions. Therefore, heavy ion collisions provide a new method for studying exotic hadrons that are either molecular states made of various hadrons or compact system consisting of muliquarks. Because their structures are related to the fundamental properties of Quantum Chromodynamics (QCD), studying exotic hadrons is currently one of the most active areas of research in hadron physics. The present review is a summary of the current understanding of a selected set of exotic candidate particles that can be potentially measured in heavy ion collisions.

Journal Articles

A Model of charmed baryon-nucleon potential and two- and three-body bound states with charmed baryon

Maeda, Saori*; Oka, Makoto; Yokota, Akira*; Hiyama, Emiko*; Liu, Y.-R.*

Progress of Theoretical and Experimental Physics (Internet), 2016(2), p.023D02_1 - 023D02_29, 2016/02

 Times Cited Count:30 Percentile:87.61(Physics, Multidisciplinary)

A potential model for the interaction between a charmed baryon ($$Lambda_c$$, $$Sigma_c$$, and $$Sigma^*_c$$) and the nucleon ($$N$$) is constructed. The model contains a long-range meson ($$pi$$ and $$sigma$$) exchange part and a short-distance quark exchange part. The quark cluster model is used to evaluate the short-range repulsion and a monopole type form factor is introduced to the long-range potential to reflect the extended structure of hadrons. We determine the cutoff parameters in the form factors by fitting the $$NN$$ scattering data with the same approach and we obtain four sets of parameters (a)-(d). The most attractive potential (d) leads to bound $$Lambda$$c$$N$$ states with $$J^pi = 0^+ $$and $$1^+$$ once the channel couplings among $$Lambda_c, Sigma_c$$ and $$Sigma^*_c$$ are taken into account. One can also investigate many-body problems with the model. Here, we construct an effective $$Lambda_cN$$ one-channel potential with the parameter set (d) and apply it to the 3-body $$Lambda_{cNN}$$ system. The bound states with $$J$$ = 1/2 and 3/2 are predicted.

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