arXiv subjects

Saori Maeda

Publications and source records attributed to Saori Maeda.

4 recordsLinked to original sources

arXiv2019

Charmed dibaryon resonances in the potential quark model

Charmed dibaryon states with the spin-parity $J^π=0^+$, $1^+$, and $2^+$are predicted for the two-body $Y_cN$ ($=Λ_c$, $Σ_c$, or $Σ^*_c$) systems. We employ the complex scaling method for the coupled channel Hamiltonian with the $Y_cN$-CTNN potentials, which were proposed in our previous study. We find four sharp resonance states near the $Σ_c N$ and $Σ^*_c N$ thresholds. From the analysis of 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 $Σ_c N$ and $Σ^*_c N$ thresholds are degenerate, and find that they form two pairs of the heavy-quark doublets in agreement with the heavy quark spin symmetry.

hep-ph↗

arXiv2018

Resonance in the $Y_{c}N$ potential model

We calculate two-body $J^π=0^{+}, 1^{+}$, and $J^π=2^{+}$ resonance states of $Y_{c}$ ($= Λ_{c}$, $Σ_{c}$, or $Σ_{c}^{*}$) 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 $Σ_{c}N$ and $Σ_{c}^{*}N$ 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 $Σ_{c}N$ and $Σ_{c}^{*}N$ thresholds are degenerate, and find that they form two pairs of the heavy-quark doublets in agreement with the heavy quark spin symmetry.

nucl-th↗

arXiv2017

Exotic Hadrons from Heavy Ion Collisions

Heavy ion collisions (HIC) at high energies are excellent ways for producing heavy hadrons and composite particles. With upgraded detectors at RHIC and LHC, it has become possible to measure hadrons beyond their ground states. Therefore, HIC provide a new method for studying exotic hadrons that are either hadronic molecular states or compact multiquark systems. Because their structures are related to the fundamental properties of QCD, studying exotic hadrons is currently one of the most active areas of research in hadron physics. Experiments carried out at various accelerator facilities have indicated that some exotic hadrons may have already been produced. The present review is a summary of the current understanding of a selected set of exotic particle candidates that can be potentially measured in HIC. It also includes discussions on the production of exotic hadrons in HIC based on the coalescence and statistical models. A more detailed discussion leads to the conclusion that the yield of a hadron is typically an order of magnitude smaller when it is a compact multiquark state than that of an excited hadronic state with normal quark numbers and/or a molecular configuration. Attention is also given to some of the proposed heavy exotic hadrons that could be produced with sufficient abundance in HIC because of the significant numbers of charm and bottom quarks produced at RHIC and LHC, making it possible to study them in these experiments. Further included in the discussion are the general formalism for the coalescence model that involves resonance particles and its implication on the present estimated yield for resonance production. Finally, a review is given on recent studies to constrain the hadron-hadron interaction through correlation measurements in HIC and their implications on the interpretation and the possible existence of exotic states in hadronic interactions.

nucl-th↗

arXiv2016

A model of charmed baryon-nucleon potential and 2- and 3-body bound states with charmed baryon

A potential model for the interaction between a charmed baryon ($Λ_c$, $Σ_c$, and $Σ_c^*$) and the nucleon ($N$) is constructed. The model contains a long-range meson ($π$ and $σ$) 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 $Λ_c N$ states with $J^π= 0^+$ and $1^+$ once the channel couplings among $Λ_c$, $Σ_c$ and $Σ_c^*$ are taken into account. One can also investigate many-body problems with the model. Here, we construct an effective $Λ_c N$ one-channel potential with the parameter set (d) and apply it to the 3-body $Λ_c NN$ system. The bound states with $J=1/2$ and $3/2$ are predicted.

nucl-th↗