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Journal Articles

Heavy hadronic molecules coupled with multiquark states

Yamaguchi, Yasuhiro; Garc$'i$a-Tecocoatzi, H.*; Giachino, A.*; Hosaka, Atsushi; Santopinto, E.*; Takeuchi, Sachiko*; Takizawa, Makoto*

Few-Body Systems, 62(3), p.33_1 - 33_7, 2021/09

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

We investigate the hidden-charm pentaquarks as hadronic molecules of $$Lambda_cbar{D}^{(ast)}$$ and $$Sigma_c^{(ast)}bar{D}^{(ast)}$$ coupled to a $$uudcbar{c}$$ compact core by employing an interaction satisfying the heavy quark and chiral symmetries. Our model can consistently explain the masses and decay widths of $$P_c^+(4312)$$, $$P_c^+(4440)$$ and $$P_c^+(4457)$$ with spin parity assignments $$J^P=1/2^-$$, $$3/2^-$$ and $$1/2^-$$, respectively. We find that the mass ordering is dominantly determined by the short-range interaction given by coupling to the compact core, while the decay widths by the tensor force of the one-pion exchange.

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

 Times Cited Count:2 Percentile:90.09(Astronomy & Astrophysics)

Journal Articles

Roper-like resonances with various flavor contents and their two-pion emission decays

Arifi, A. J.*; Nagahiro, Hideko*; Hosaka, Atsushi; Tanida, Kiyoshi

Physical Review D, 101(11), p.111502_1 - 111502_5, 2020/06

 Times Cited Count:8 Percentile:83.46(Astronomy & Astrophysics)

Journal Articles

Three-body decay of $$Lambda_c^{*} (2765)$$ and determination of its spin-parity

Arifi, A. J.*; Nagahiro, Hideko*; Hosaka, Atsushi; Tanida, Kiyoshi

Physical Review D, 101(9), p.094023_1 - 094023_17, 2020/05

 Times Cited Count:6 Percentile:75.52(Astronomy & Astrophysics)

Journal Articles

$$P_c$$ pentaquarks with chiral tensor and quark dynamics

Yamaguchi, Yasuhiro; Garc$'i$a-Tecocoatzi, H.*; Giachino, A.*; Hosaka, Atsushi; Santopinto, E.*; Takeuchi, Sachiko*; Takizawa, Makoto*

Physical Review D, 101(9), p.091502_1 - 091502_7, 2020/05

 Times Cited Count:19 Percentile:96.13(Astronomy & Astrophysics)

We investigate the hidden-charm pentaquarks as hadronic molecules of $$Lambda_cbar{D}^{(ast)}$$ and $$Sigma_c^{(ast)}bar{D}^{(ast)}$$ coupled to a $$uudcbar{c}$$ compact core by employing an interaction satisfying the heavy quark and chiral symmetries. Our model can consistently explain the masses and decay widths of $$P_c^+(4312)$$, $$P_c^+(4440)$$ and $$P_c^+(4457)$$ with spin parity assignments $$J^P=1/2^-$$, $$3/2^-$$ and $$1/2^-$$, respectively. We find that the mass ordering is dominantly determined by the short-range interaction given by coupling to the compact core, while the decay widths by the tensor force of the one-pion exchange.

Journal Articles

Compact $$ssscbar c$$ 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

 Times Cited Count:0

Journal Articles

Compact $$ssscbar{c}$$ 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

AA2019-0487.pdf:1.01MB

 Times Cited Count:7 Percentile:80.58(Astronomy & Astrophysics)

Journal Articles

Search of QCD phase transition points in the canonical approach of the NJL model

Wakayama, Masayuki*; Hosaka, Atsushi

Physics Letters B, 795, p.548 - 553, 2019/08

 Times Cited Count:4 Percentile:61.83(Astronomy & Astrophysics)

Journal Articles

Vector and Axial-vector form factors in radiative kaon decay and flavor SU(3) symmetry breaking

Shim, S.-I.*; Hosaka, Atsushi; Kim, H.-C.*

Physics Letters B, 795, p.438 - 445, 2019/08

 Times Cited Count:2 Percentile:39.22(Astronomy & Astrophysics)

Journal Articles

Photoproduction and electroproduction of $$Lambda(1405)$$ via $$gamma^{(*)} pto K^{*+}pi^0Sigma^0$$

Nam, S.-I.*; Hosaka, Atsushi

Physical Review C, 100(1), p.015205_1 - 015205_10, 2019/07

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

Journal Articles

Emergence of a complete heavy-quark spin symmetry multiplet; Seven molecular pentaquarks in light of the latest LHCb analysis

Liu, M.-Z.*; Pan, Y.-W.*; Peng, F.-Z.*; S$'a$nchez-S$'a$nchez, M.*; Geng, L.-S.*; Hosaka, Atsushi; Valderrama, M. P.*

Physical Review Letters, 122(24), p.242001_1 - 242001_5, 2019/06

 Times Cited Count:106 Percentile:99.61(Physics, Multidisciplinary)

Journal Articles

Identifying the $$Xi_{b}(6227)$$ and $$Sigma_{b}(6097)$$ as $$P$$-wave bottom baryons of $$J^P = 3/2^-$$

Cui, E.-L.*; Yang, H.-M.*; Chen, H.-X.*; Hosaka, Atsushi

Physical Review D, 99(9), p.094021_1 - 094021_15, 2019/05

 Times Cited Count:19 Percentile:88.98(Astronomy & Astrophysics)

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

 Times Cited Count:18 Percentile:91(Physics, Nuclear)

A quark model, which reproduces the ground-state mesons and baryons, i.e., the threshold energies, is applied to the $$qqqcbar c$$ configurations, where $$q$$ is a light quark and $$c$$ the charmed quark. In the calculation, several open channels are explicitly included such as $$J/psi +N$$, $$eta_c+N$$, $$Lambda_c +D$$, 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 $$P_c(4380)$$ and $$P_c(4450)$$ pentaquarks. On the other hand, there is a sharp resonant state at 4690 MeV with $$J=1/2^-$$ state and another one at 4920 MeV with $$J=3/2^-$$ state, which have a compact structure.

Journal Articles

Structure of charmed baryons studied by pionic decays

Nagahiro, Hideko*; Yasui, Shigehiro*; Hosaka, Atsushi; Oka, Makoto; Noumi, Hiroyuki*; Noumi, Hiroyuki*

Physical Review D, 95(1), p.014023_1 - 014023_20, 2017/01

 Times Cited Count:39 Percentile:92.61(Astronomy & Astrophysics)

We investigate the decays of the charmed baryons aiming at the systematic understanding of hadron internal structures based on the quark model by paying attention to heavy quark symmetry. We evaluate the decay widths from the one pion emission for the known excited states, $$Lambda^*_c(2595)$$, $$Lambda^*_c(2625)$$, $$Lambda^*_c(2765)$$, $$Lambda^*_c (2880)$$ and $$Lambda^*_c(2940)$$, as well as for the ground states $$Sigma_c(2455)$$ and $$Sigma^*_c(2520)$$. The calculated decay widths are in good agreement with the experimental data, and several important predictions for higher excited $$Lambda^*_c$$ baryons are given. We also find that the axial-vector type coupling of the pion to the light quarks is essential, which is expected from chiral symmetry, to reproduce the decay widths especially of the low lying $$Lambda^*_c$$ baryons. We emphasize the importance of the branching ratios of $$Gamma(Sigma^*_c pi)/Gamma(Sigma_c pi)$$ for the study of the nature of higher excited $$Lambda^*_c$$ baryons.

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

 Times Cited Count:115 Percentile:98.76(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 $$LS$$ (spin-orbit) force is introduced. Model parameters are fixed by the strange baryon spectra, $$Lambda$$ and $$Sigma$$ 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

Electron and ion coincidence momentum imaging of multichannel dissociative ionization of ethanol in intense laser fields

Itakura, Ryuji; Hosaka, Koichi*; Yokoyama, Atsushi; Ikuta, Tomoya*; Kannari, Fumihiko*; Yamanouchi, Kaoru*

Progress in Ultrafast Intense Laser Science XI; Springer Series in Chemical Physics, Vol.109, p.23 - 42, 2015/00

We investigate the multichannel dissociative ionization of ethanol in intense laser fields by the photoelectron-photoion coincidence momentum imaging and identify separately the ionization and subsequent electronic excitation in ethanol. From the energy correlation between a photoelectron and a fragment ion, we reveal the amount of the internal energy gained by ethanol cations from the laser field varies depending on the respective ionization and electronic excitation pathways.

Journal Articles

Correlation between a photoelectron and a fragment ion in dissociative ionization of ethanol in intense near-infrared laser fields

Hosaka, Koichi*; Yokoyama, Atsushi; Yamanouchi, Kaoru*; Itakura, Ryuji

Journal of Chemical Physics, 138(20), p.204301_1 - 204301_9, 2013/05

 Times Cited Count:12 Percentile:44.57(Chemistry, Physical)

Dissociative ionization of ethanol (C$$_{2}$$H$$_{5}$$OH) induced by an intense near-infrared laser pulse are investigated using photoelectron-photoion coincidence method. It is shown that both the electronic ground state and the first electronically excited state of C$$_{2}$$H$$_{5}$$OH$$^{+}$$ are produced at the moment of photoelectron emission. From the observed correlation between the electronic states of C$$_{2}$$H$$_{5}$$OH$$^{+}$$ prepared at the moment of photoelectron emission and the kinetic energy release of the fragment ions, it is revealed that C$$_{2}$$H$$_{5}$$OH$$^{+}$$ prepared in the electronic ground state at the photoelectron emission gains larger internal energy in the end than that prepared in the electronically excited state. The averaged internal energy of C$$_{2}$$H$$_{5}$$OH$$^{+}$$ just before the dissociation is found to increase when the laser field intensity increases from 9 to 23 TW/cm$$^{2}$$. And when the laser pulse duration increases from 35 to 800 fs.

Journal Articles

Separation of ionization and subsequent electronic excitation for formation of electronically excited ethanol cation in intense laser fields

Ikuta, Tomoya*; Hosaka, Koichi*; Akagi, Hiroshi; Yokoyama, Atsushi; Yamanouchi, Kaoru*; Kannari, Fumihiko*; Itakura, Ryuji

Journal of Physics B; Atomic, Molecular and Optical Physics, 44(19), p.191002_1 - 191002_5, 2011/10

 Times Cited Count:8 Percentile:39.78(Optics)

Ionization and subsequent electronic excitation occurring within the same laser pulse (400 nm, 96 fs, 1.3$$sim$$18 TW/cm$$^{-2}$$) are separately investigated by measuring in coincidence an electron and a product ion produced from C$$_{2}$$H$$_{5}$$OH. We reveal that the nascent population in the electronically excited C$$_{2}$$H$$_{5}$$OH$$^{+}$$ prepared by the ionization decreases as the laser intensity increases, while the subsequent electronic excitation is enhanced through the resonant electronic transitions. Ionization and electronic excitation mechanisms are described based on the electronic state distributions of C$$_{2}$$H$$_{5}$$OH$$^{+}$$.

Journal Articles

Photoelectron-photoion coincidence momentum imaging for dissociative ionization of ethanol in intense laser fields

Hosaka, Koichi; Itakura, Ryuji; Yokoyama, Keiichi; Yamanouchi, Kaoru*; Yokoyama, Atsushi

Chemical Physics Letters, 475(1-3), p.19 - 23, 2009/06

 Times Cited Count:11 Percentile:35.14(Chemistry, Physical)

In intense laser fields, molecules are decomposed into fragments through a number of competing dissociative ionization pathways. We investigate the dissociative ionization dynamics of ethanol in intense laser fields with photoelectron-photoion coincidence momentum imaging. The channel-specific photoelectron spectra reveal the electronic states prepared just after ionization, depending both on the decomposition pathways and on the temporal profile of laser pulses.

Oral presentation

Photoelectron-photoion coincidence momentum imaging for dissociative ionization in intense laser fields

Hosaka, Koichi; Itakura, Ryuji; Yokoyama, Keiichi; Yamanouchi, Kaoru*; Yokoyama, Atsushi

no journal, , 

When molecules are exposed to intense laser fields, dissociative ionization is efficiently induced and several decomposition pathways competes. The present study aims at revealing the correlation between the electronic states just after ionization and the following dissociation process. The photoelectron-photoion coincidence momentum imaging (PEPICO-MI) technique enables us to detect photoelectrons and photoions produced in a single event simultaneously. We applied PEPICO-MI to dissociative ionization of ethanol (C$$_{2}$$H$$_{5}$$OH), whose branching ratio varies as a function of the laser pulse duration. When ethanol molecules are irradiated with a short laser pulse, photoelectron images strongly depend on the correlated product ions.

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