Refine your search:     
Report No.
 - 
Search Results: Records 1-20 displayed on this page of 227

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

Journal Articles

Suppression of decay widths in singly heavy baryons induced by the $$U_A(1)$$ anomaly

Kawakami, Yohei*; Harada, Masayasu*; Oka, Makoto; Suzuki, Kei

Physical Review D, 102(11), p.114004_1 - 114004_9, 2020/12

 Times Cited Count:0 Percentile:100(Astronomy & Astrophysics)

We study strong and radiative decays of excited singly heavy baryons using an effective chiral Lagrangian based on the diquark picture. The effective Lagrangian contains a $$U_A(1)$$ anomaly term, which is found to suppress the decay width of $$Lambda_Q(1/2^-) to Lambda_Q(1/2^+)eta$$.

Journal Articles

Skyrmion; 60 years of evolution

Oka, Makoto

Nippon Butsuri Gakkai-Shi, 75(10), p.608 - 609, 2020/10

An introductory review of the Skyrmion in the JPS bulletin journal.

Journal Articles

Hexaquark picture for $$d$$*(2380)

Kim, H.*; Kim, K. S.*; Oka, Makoto

Physical Review D, 102(7), p.074023_1 - 074023_10, 2020/10

 Times Cited Count:0 Percentile:100(Astronomy & Astrophysics)

no abstracts in English

Journal Articles

Charmed baryon spectrum from lattice QCD near the physical point

Bahtiyar, H.*; Can, K. U.*; Erkol, G.*; Gubler, P.; Oka, Makoto; Takahashi, Toru*

Physical Review D, 102(5), p.054513_1 - 054513_18, 2020/09

 Times Cited Count:4 Percentile:13.24(Astronomy & Astrophysics)

Spectrum of the ground state and excited states of charmed baryons was evaluated in the lattice QCD, the first principle of hadronic interaction. We deliver the spectrum of the positive and negative parity baryons with one, two or three charmed quarks. A variational approach was employed by the use of multiple operators with different Dirac matrix configurations and the smearings.

Journal Articles

Strange pentaquarks with a hidden heavy quark-antiquark pair

Takeuchi, Sachiko*; Giachino, A.*; Takizawa, Makoto*; Santopinto, E.*; Oka, Makoto

Hadron Spectroscopy and Structure; Proceedings of the 18th International Conference (HADRON 2019), p.333 - 337, 2020/08

Pentaquarks with $$c bar{c}$$ or $$b bar{b}$$ heavy quarks are very much interesting. We analyze the strange pentaquark with $$c bar{c}$$ or $$b bar{b}$$ in the coupled-channel quark cluster model. We find bound, resonance and cusp like states.

Journal Articles

Signatures of the vortical quark-gluon plasma in hadron yields

Taya, Hidetoshi*; Park, A.*; Cho, S.*; Gubler, P.; Hattori, Koichi*; Hong, J.*; Huang, X.-G.*; Lee, S. H.*; Monnai, Akihiko*; Onishi, Akira*; et al.

Physical Review C, 102(2), p.021901_1 - 021901_6, 2020/08

 Times Cited Count:1 Percentile:38.64(Physics, Nuclear)

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

 Times Cited Count:6 Percentile:9.3(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

Chiral effective theory of diquarks and the $$U_A(1)$$ anomaly

Harada, Masayasu*; Liu, Y.-R.*; Oka, Makoto; Suzuki, Kei

Physical Review D, 101(5), p.054038_1 - 054038_11, 2020/03

 Times Cited Count:5 Percentile:9.3(Astronomy & Astrophysics)

Using a chiral effective theory of diquarks, we analyze the spectrum and structure of diquark and heavy baryons consisting of diquarks. $$U_A(1)$$ anomaly is considered in the chiral Lagrangian and its effects are studied.

Journal Articles

Radiative transitions of singly and doubly charmed baryons in lattice QCD

Bahtiyar, H.*; Can, K. U.*; Erkol, G.*; Oka, Makoto; Takahashi, Toru*

JPS Conference Proceedings (Internet), 26, p.022027_1 - 022027_4, 2019/11

Transition amplitude of spin 3/2 single and double-charm baryon to spin 1/2 ground state was evaluated in the lattice QCD, the first principle.

Journal Articles

Spectrum of the charmed baryons in 2+1-flavor lattice QCD

Can, K. U.*; Bahtiyar, H.*; Erkol, G.*; Gubler, P.; Oka, Makoto; Takahashi, Toru*

JPS Conference Proceedings (Internet), 26, p.022028_1 - 022028_5, 2019/11

Spectrum of the ground state and excited states of charmed baryons was evaluated in the lattice QCD, the first principle.

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

 Times Cited Count:4 Percentile:25.07(Astronomy & Astrophysics)

Journal Articles

Hadronic Paschen-Back effect in charmonium

Iwasaki, Sachio; Oka, Makoto; Suzuki, Kei*; Yoshida, Tetsuya*

AIP Conference Proceedings 2130, p.050001_1 - 050001_8, 2019/07

 Times Cited Count:0 Percentile:100

We find a novel phenomenon induced by the interplay between a strong magnetic field and finite orbital angular momenta in hadronic systems, which is analogous to the Paschen-Back effect observed in the field of atomic physics. This effect allows the wave functions to drastically deform. We discuss anisotropic decay from the deformation as a possibility to measure the strength of the magnetic field in heavy-ion collision at LHC, RHIC and SPS, which has not experimentally been measured. As an example we investigate charmonia with finite orbital angular momentum in a strong magnetic field. We calculate the mass spectra and mixing rate. To obtain anisotropic wave functions, we apply the cylindrical Gaussian expansion method, where the Gaussian bases to expand the wave functions have different widths along transverse and longitudinal directions in the cylindrical coordinate.

Journal Articles

Research and development on membrane IS process for hydrogen production using solar heat

Myagmarjav, O.; Iwatsuki, Jin; Tanaka, Nobuyuki; Noguchi, Hiroki; Kamiji, Yu; Ioka, Ikuo; Kubo, Shinji; Nomura, Mikihiro*; Yamaki, Tetsuya*; Sawada, Shinichi*; et al.

International Journal of Hydrogen Energy, 44(35), p.19141 - 19152, 2019/07

 Times Cited Count:8 Percentile:35.73(Chemistry, Physical)

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

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

Hadronic Paschen-Back effect in P-wave charmonia under strong magnetic fields

Iwasaki, Sachio; Oka, Makoto; Suzuki, Kei*; Yoshida, Tetsuya*

International Journal of Modern Physics; Conference Series (Internet), 49, p.1960002_1 - 1960002_6, 2019/07

The hadronic Paschen-Back effects in P-wave charmonia are analyzed using the constituent quark models in strong magnetic field.

Journal Articles

The Surface composition of asteroid 162173 Ryugu from Hayabusa2 near-infrared spectroscopy

Kitazato, Kohei*; Milliken, R. E.*; Iwata, Takahiro*; Abe, Masanao*; Otake, Makiko*; Matsuura, Shuji*; Arai, Takehiko*; Nakauchi, Yusuke*; Nakamura, Tomoki*; Matsuoka, Moe*; et al.

Science, 364(6437), p.272 - 275, 2019/04

 Times Cited Count:102 Percentile:0.15(Multidisciplinary Sciences)

The near-Earth asteroid 162173 Ryugu, the target of Hayabusa2 sample return mission, is believed to be a primitive carbonaceous object. The Near Infrared Spectrometer (NIRS3) on Hayabusa2 acquired reflectance spectra of Ryugu's surface to provide direct measurements of the surface composition and geological context for the returned samples. A weak, narrow absorption feature centered at 2.72 micron was detected across the entire observed surface, indicating that hydroxyl (OH)-bearing minerals are ubiquitous there. The intensity of the OH feature and low albedo are similar to thermally- and/or shock-metamorphosed carbonaceous chondrite meteorites. There are few variations in the OH-band position, consistent with Ryugu being a compositionally homogeneous rubble-pile object generated from impact fragments of an undifferentiated aqueously altered parent body.

Journal Articles

Nucleon and $$Delta$$ isobar in a strong magnetic field

Yakhshiev, U.*; Kim, H.-C.; Oka, Makoto

Physical Review D, 99(5), p.054027_1 - 054027_11, 2019/03

 Times Cited Count:0 Percentile:100(Astronomy & Astrophysics)

We investigate Skyrmion solution of the chiral Lagrangian with magnetic field. We find that the Skyrmion is deformed in the magnetic field and its mass increases accordingly. The nucleon and $$Delta$$ isobar states are considered in the Skyrme model.

Journal Articles

Hadronic Paschen-Back effect

Iwasaki, Sachio; Oka, Makoto; Suzuki, Kei*; Yoshida, Tetsuya*

Physics Letters B, 790, p.71 - 76, 2019/03

 Times Cited Count:4 Percentile:25.07(Astronomy & Astrophysics)

We find a novel phenomenon induced by the interplay between a strong magnetic field and finite orbital angular momenta in hadronic systems, which is analogous to the Paschen-Back effect observed in the field of atomic physics. This effect allows the wave functions to drastically deform. We discuss anisotropic decay from the deformation as a possibility to measure the strength of the magnetic field in heavy-ion collision at LHC, RHIC and SPS, which has not experimentally been measured. As an example we investigate charmonia with finite orbital angular momentum in a strong magnetic field. We calculate the mass spectra and mixing rate. To obtain anisotropic wave functions, we apply the cylindrical Gaussian expansion method, where the Gaussian bases to expand the wave functions have different widths along transverse and longitudinal directions in the cylindrical coordinate.

Journal Articles

Dynamic accommodation of internal stress and selection of crystallographic orientation relationship in pearlite

Amemiya, Yutaro*; Nakada, Nobuo*; Morooka, Satoshi; Kosaka, Makoto*; Kato, Masaharu*

Tetsu To Hagane, 105(2), p.314 - 323, 2019/02

 Times Cited Count:3 Percentile:46.64(Metallurgy & Metallurgical Engineering)

For deeper understanding of a dynamic accommodation mechanism of internal stress in pearlite originated from the lattice misfit between ferrite and cementite phases, the lattice parameter ratios of cementite were locally analyzed in detail by using the electron backscatter diffraction (EBSD) technique. The EBSD analysis has revealed that lattice parameter ratios of cementite lamellae obviously differ from those of spheroidized cementite particles, which demonstrates that pearlite has a certain amount of internal stress as long as it maintains lamellar structure. The internal stress in pearlite gradually decreased during isothermal holding at 923 K after pearlitic transformation due to interfacial atomic diffusion of iron atoms. However, comparing with theoretical values under Pitsch-Petch orientation relationship, it was understood that large amount of internal stress had been already accommodated upon pearlitic transformation by introduction of misfit dislocations and structural ledges on ferrite/cementite lamellar interfaces. That is, the internal stress of pearlite is dynamically reduced by two different processes; built-in accommodation upon pearlitic transformation and additional time-dependent relaxation after pearlitic transformation. On the other hand, EBSD analysis and neutron diffraction technique gave remarkably different lattice parameters of cementite. From this result, it is concluded that various crystallographic orientation relationships between ferrite and cementite coexist in pearlite. Furthermore, elastic strain energy analysis suggests that the invariant-line criterion on ferrite/cementite interface plays an important role for the selection of orientation relationships in pearlite.

227 (Records 1-20 displayed on this page)