JOPSS - Search Results

Journal Articles

Doubly heavy tetraquark resonant states

Meng, Q.*; Harada, Masayasu*; Hiyama, Emiko; Hosaka, Atsushi; Oka, Makoto

Physics Letters B, 824, p.136800_1 - 136800_5, 2022/01

https://doi.org/10.1016/j.physletb.2021.136800

Times Cited Count：14 Percentile：97.23(Astronomy & Astrophysics)

Spectrum of the doubly heavy tetraquarks, , is studied in a constituent quark model. Four-body problem is solved in a variational method where the real scaling technique is used to identify resonant states above the fall-apart decay thresholds. In addition to the two bound states that were reported in the previous study we have found several narrow resonant states above the and thresholds. Their structures are studied and are interpreted by the quark dynamics. A narrow resonance with spin-parity is found to be a mixed state of a compact tetraquark and a scattering state. This is driven by a strong color Coulombic attraction between the quarks. Negative-parity excited resonances with , and form a triplet under the heavy-quark spin symmetry. It turns out that they share a similar structure to the -mode of a singly heavy baryon as a result of the strongly attractive correlation for the doubly heavy diquark.

Journal Articles

Prediction of Double-heavy Tetraquarks Bound States in Quark Model

Meng, Q.*; Hiyama, Emiko; Hosaka, Atsushi; Oka, Makoto; Gubler, P.; Can, K. U.*; Takahashi, Toru*; Zong, H. S.*

Few-Body Systems, 62(4), p.79_1 - 79_5, 2021/12

https://doi.org/10.1007/s00601-021-01665-6

Times Cited Count：0 Percentile：0(Physics, Multidisciplinary)

Journal Articles

Stable double-heavy tetraquarks; Spectrum and structure

Meng, Q.*; Hiyama, Emiko*; Hosaka, Atsushi; Oka, Makoto; Gubler, P.; Can, K. U.*; Takahashi, Toru*; Zong, H. S.*

Physics Letters B, 814, p.136095_1 - 136095_6, 2021/03

https://doi.org/10.1016/j.physletb.2021.136095

Times Cited Count：35 Percentile：98.84(Astronomy & Astrophysics)

Journal Articles

Weinberg operator contribution to the nucleon electric dipole moment in the quark model

Yamanaka, Nodoka*; Hiyama, Emiko

Physical Review D, 103(3), p.035023_1 - 035023_10, 2021/02

https://doi.org/10.1103/PhysRevD.103.035023

Times Cited Count：12 Percentile：74.69(Astronomy & Astrophysics)

Journal Articles

Spectrum of singly heavy baryons from a chiral effective theory of diquarks

Kim, Y.*; Hiyama, Emiko*; Oka, Makoto; Suzuki, Kei

Physical Review D, 102(1), p.014004_1 - 014004_9, 2020/07

AA2019-0768.pdf:0.47MB

https://doi.org/10.1103/PhysRevD.102.014004

Times Cited Count：17 Percentile：76.24(Astronomy & Astrophysics)

Applying the chiral effective theory of diquarks, we analyze the spectrum and structure of singly heavy baryons. We introduce the phenomenological quark-model potentials for the confinement. We predict the charmed and bottom baryon spectrum showing the inverse mass hierarchy.

Journal Articles

Compact pentaquark states predicted by a quark model

Meng, Q.*; Hiyama, Emiko*; Can, K. U.*; Gubler, P.; Oka, Makoto; Hosaka, Atsushi; Zong, H.*

Physics Letters B, 798, p.135028_1 - 135028_8, 2019/11

https://doi.org/10.1016/j.physletb.2019.135028

Times Cited Count：0

Journal Articles

Mass spectra of heavy mesons with instanton effects

Wu, Q.*; Hiyama, Emiko*; Kim, H.-C.; Yakhshiev, U.*; Zong, H.*

Progress of Theoretical and Experimental Physics (Internet), 2018(12), p.123D01_1 - 123D01_11, 2018/12

https://doi.org/10.1093/ptep/pty135

Times Cited Count：0 Percentile：0.01(Physics, Multidisciplinary)

Journal Articles

Quark model estimate of hidden-charm pentaquark resonances

Hiyama, Emiko; Hosaka, Atsushi; Oka, Makoto; Richard, J.-M.*

Physical Review C, 98(4), p.045208_1 - 045208_8, 2018/10

https://doi.org/10.1103/PhysRevC.98.045208

Times Cited Count：43 Percentile：95.61(Physics, Nuclear)

A quark model, which reproduces the ground-state mesons and baryons, i.e., the threshold energies, is applied to the configurations, where is a light quark and the charmed quark. In the calculation, several open channels are explicitly included such as , , , etc. To distinguish genuine resonances and estimate their width, we employ Gaussian Expansion Method supplemented by the real scalingmethod (stabilization). No resonance is found at the energies of the and pentaquarks. On the other hand, there is a sharp resonant state at 4690 MeV with state and another one at 4920 MeV with state, which have a compact structure.

Journal Articles

Production and decay of charmed baryons

Hosaka, Atsushi; Hiyama, Emiko; Kim, S.-H.*; Kim, H.-C.*; Nagahiro, Hideko*; Noumi, Hiroyuki*; Oka, Makoto; Shirotori, Kotaro*; Yoshida, Tetsuya*; Yasui, Shigehiro*

Nuclear Physics A, 954, p.341 - 351, 2016/10

https://doi.org/10.1016/j.nuclphysa.2016.05.009

Times Cited Count：3 Percentile：26.8(Physics, Nuclear)

In this paper, we discuss reactions involving charmed baryons to explore their unique features. A well known phenomenon, the separation of the two internal motions of the and types of a three-quark system is revisited. First we discuss the mass spectrum of low-lying excitations as functions of the heavy quark mass, smoothly connecting the and heavy quark limits. The properties of these modes can be tested in the production and decay reactions of the baryons. For the productions, we consider a one step process which excites dominantly mode excitations. We find abundant production rates for some of excited states. For decays, we study pion emission process, which provides a clean tool to test the structure of heavy quark systems due to well controlled low energy dynamics of the pion and quark. Both productions and decays of the charmed baryons are the issues of the future experiments at J-PARC.

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

https://doi.org/10.1093/ptep/ptv194

Times Cited Count：32 Percentile：82.89(Physics, Multidisciplinary)

A potential model for the interaction between a charmed baryon (, , and ) and the nucleon () is constructed. The model contains a long-range meson ( and ) 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 scattering data with the same approach and we obtain four sets of parameters (a)-(d). The most attractive potential (d) leads to bound c states with and once the channel couplings among and are taken into account. One can also investigate many-body problems with the model. Here, we construct an effective one-channel potential with the parameter set (d) and apply it to the 3-body $Lambda_{cNN}$ system. The bound states with = 1/2 and 3/2 are predicted.

Journal Articles

Spectrum of heavy baryons in the quark model

Yoshida, Tetsuya*; Hiyama, Emiko*; Hosaka, Atsushi*; Oka, Makoto; Sadato, Katsunori*

Physical Review D, 92(11), p.114029_1 - 114029_19, 2015/12

https://doi.org/10.1103/PhysRevD.92.114029

Times Cited Count：173 Percentile：99.11(Astronomy & Astrophysics)

Single- and double-heavy baryons are studied in the constituent quark model. The model Hamiltonian is chosen as a standard one with two exceptions: (1) the color-Coulomb term depends on quark masses and (2) an antisymmetric (spin-orbit) force is introduced. Model parameters are fixed by the strange baryon spectra, and baryons. The masses of the observed charmed and bottomed baryons are, then, fairly well reproduced. Our focus is on the low-lying negative-parity states, in which the heavy baryons show specific excitation modes reflecting the mass differences of heavy and light quarks. By changing quark masses from the SU(3) limit to the strange quark mass, and, further, to the charm and bottom quark masses, we demonstrate that the spectra change from the SU(3) symmetry patterns to the heavy-quark-symmetry ones.

Journal Articles

Radiative capture reaction rate from to H dibaryon in the imaginary time method

Hikota, Eri*; Funaki, Yasuro*; Hiyama, Emiko*; Oka, Makoto

Physical Review C, 92(1), p.015205_1 - 015205_10, 2015/07

https://doi.org/10.1103/PhysRevC.92.015205

Times Cited Count：0 Percentile：0.02(Physics, Nuclear)

Radiative capture rates of thermal states into a H dibaryon are calculated in the novel imaginary time method. The H dibaryon is assumed to be a bound state of with spin , isospin and strangeness . We consider the transition to H from scattering states which mix with . In order to calculate the transition rates, we formulate a coupled-channel imaginary time method by extending the one-channel formula originally proposed by Yabana and Funaki. The imaginary time method allows us to avoid the sum over all the excited thermal initial states, and thus to save computational time significantly. The transition rates are given as a function of temperature and the unknown binding energy of the H dibaryon, which we take as a parameter. It is found that the transition rate is not sensitive to the choices of the H binding energy or the strengths of the channel coupling for temperatures 3 MeV or higher.