Search results for: Atsushi Hosaka

Items from 1 to 20 out of 25 results

article

Inhibitory assay for degradation of collagen IV by cathepsin B with a surface plasmon resonance sensor

Atsushi Shoji, Yumiko Suenaga, Atsushi Hosaka, Yuuki Ishida, more

Journal of Pharmaceutical and Biomedical Analysis > 2017 > 145 > C > 79-83

We describe a simple method for evaluating the inhibition of collagen IV degradation by cathepsin B with a surface plasmon resonance (SPR) biosensor. The change in the SPR signal decreased with an increase in the concentration of cathepsin B inhibitors. The order of the inhibitory constant (Ki) obtained by the SPR method was CA074Me≈Z-Phe-Phe-FMK < leupeptin. This order was different from that...

article

Heavy hadrons in nuclear matter

Atsushi Hosaka, Tetsuo Hyodo, Kazutaka Sudoh, Yasuhiro Yamaguchi, more

Progress in Particle and Nuclear Physics > 2017 > 96 > Complete > 88-153

Current studies on heavy hadrons in nuclear medium are reviewed with a summary of the basic theoretical concepts of QCD, namely chiral symmetry, heavy quark spin symmetry, and the effective Lagrangian approach. The nuclear matter is an interesting place to study the properties of heavy hadrons from many different points of view. We emphasize the importance of the following topics: (i) charm/bottom...

article

Heavy pentaquark states Pc(4380) and Pc(4450) in the J/ψ production induced by pion beams off the nucleon

Sang-Ho Kim, Hyun-Chul Kim, Atsushi Hosaka

Physics Letters B > 2016 > 763 > C > 358-364

In this study, we investigate the J/ψ production induced by pion beams off the nucleon, particularly the heavy pentaquarks Pc(4380) and Pc(4450) in intermediate states, based on a hybridized Regge model. The process involving ρ and π meson exchange in the t channel is considered as background, and the heavy pentaquark exchange is included in the s channel. The coupling constants such as the ρNN and...

article

Production and decay of charmed baryons

Atsushi Hosaka, Emiko Hiyama, SangHo Kim, Hyun-Chul Kim, more

Nuclear Physics A > 2016 > 954 > C > 341-351

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 ρ and λ types of a three-quark system is revisited. First we discuss the mass spectrum of low lying excitations as function of the heavy quark mass, smoothly connecting the SU(3) and heavy quark limits. The properties of these modes...

article

Quantum processes in short and intensive electromagnetic fields

A. I. Titov, Burkhard Kämpfer, Atsushi Hosaka, Hideaki Takabe

Physics of Particles and Nuclei > 2016 > 47 > 3 > 456-487

This work provides an overview of our recent results in studying two most important and widely discussed quantum processes: electron-positron pairs production off a probe photon propagating through a polarized short-pulsed electromagnetic (e.g. laser) wave field or generalized Breit–Wheeler process, and a single a photon emission off an electron interacting with the laser pules, so-called non-linear...

article

Exotic dibaryons with a heavy antiquark

Yasuhiro Yamaguchi, Shigehiro Yasui, Atsushi Hosaka

Nuclear Physics, Section A > 2014 > 927 > Complete > 110-118

We discuss the possible existence of exotic dibaryons with a heavy antiquark, being realized as three-body systems, D¯(⁎)NN and B(⁎)NN. These are genuinely exotic states with no quark–antiquark annihilation. We consider the heavy quark spin and chiral symmetries, and introduce the one pion exchange potential between a D¯(⁎) (B(⁎)) meson and a nucleon N. As for the NN interaction, we employ the Argonne...

article

Laser pulse-shape dependence of Compton scattering

Alexander I. Titov, Burkhard Kämpfer, Takuya Shibata, Atsushi Hosaka, more

The European Physical Journal D > 2014 > 68 > 10 > 1-13

Compton scattering of short and ultra short (sub-cycle) laser pulses off mildly relativistic electrons is considered within a QED framework. The temporal shape of the pulse is essential for the differential cross section as a function of the energy of the scattered photon at fixed observation angle. The partly integrated cross section is sensitive to the non-linear dynamics resulting in a large enhancement...

article

Spin degeneracy in multi-hadron systems with a heavy quark

Shigehiro Yasui, Kazutaka Sudoh, Yasuhiro Yamaguchi, Shunsuke Ohkoda, more

Physics Letters B > 2013 > 727 > 1-3 > 185-189

We study multi-hadron systems with a single heavy quark (charm or bottom) in the limit of heavy quark mass. The spin degeneracy of the states with quantum numbers (j+1/2)P and (j−1/2)P for j≠0, known in a normal hadron, can be generalized to multi-hadron systems. The spin degeneracy is the universal phenomena for any multi-hadron systems with a single heavy quark, irrespective of their internal structures,...

article

Composite and Elementary Components in Hadron Resonances

Atsushi Hosaka, Tetsuo Hyodo, Daisuke Jido, Hideko Nagahiro, more

Few-Body Systems > 2013 > 54 > 1-4 > 19-24

In hadron resonances different structures of hadronic composite (molecule) and elementary (quark-intrinsic) natures may coexist. We sketch discussions based on our previous publications on the origin of hadron resonances (Hyodo et al. Phys. Rev. C 78:025203, 2008) on exotic $${\bar D (B)}$$ meson–nucleons as candidates of hadronic composites (Yamaguchi et al. Phys. Rev. D 84:014032, 2011) and...

article

Contribution of N* and Δ* Resonances in $${K^*\Sigma}$$ (1190) Photoproduction

Sang-Ho Kim, Seung-il Nam, Atsushi Hosaka, Hyun-Chul Kim

Few-Body Systems > 2013 > 54 > 7-10 > 1499-1502

In this talk, we report theoretical studies on the $${K^{*0}\Sigma^+(1190)}$$ photoproduction in the tree-level Born approximation, employing the effective Lagrangian method. We present the energy and angular dependences of the cross sections. It turns out that the N ^* and Δ^* resonance contributions are negligible in the vicinity of the threshold. On the contrary, we observe that the $${\kappa}$$...

article

A hidden local symmetry approach to rho-meson photoproduction

Hiromi Kaneko, Atsushi Hosaka, Olaf Scholten

The European Physical Journal A > 2012 > 48 > 5 > 1-6

We study the photoproduction of $\rho$ -mesons in a model of hidden local symmetry. For this purpose, the $\rho$ -meson is introduced as a hidden-gauge boson in a non-linear sigma model. For charged $\rho$ -meson photoproduction, the model takes into account the $\rho$ -meson magnetic moments from the three-point vertex in the kinetic terms. We show that the magnetic interaction of...

article

Meson-baryon nature of the Λ(1405) in chiral dynamics

Tetsuo Hyodo, Daisuke Jido, Atsushi Hosaka

Nuclear Physics, Section A > 2010 > 835 > 1-4 > 402-405

We present recent progress in the study of the origin of baryon resonances in chiral dynamics. It is shown that in the chiral coupled-channel approach, the form of the interaction cannot be specified due to the cutoff of the loop integral. To avoid this ambiguity, we propose a natural renormalization scheme, which affords a clue to the origin of the resonance, together with the phenomenological fitting...

article

Chiral properties of baryon interpolating fields

Keitaro Nagata, Atsushi Hosaka, V. Dmitrašinović

The European Physical Journal C > 2008 > 57 > 3 > 557-567

We study the chiral transformation properties of all possible local (non-derivative) interpolating field operators for baryons consisting of three quarks with two flavors, assuming good isospin symmetry. We derive and use the relations/identities among the baryon operators with identical quantum numbers that follow from the combined color, Dirac and isospin Fierz transformations. These relations reduce...

article

QCD sum rule study of the masses of light tetraquark scalar mesons

Hua-Xing Chen, Atsushi Hosaka, Shi-Lin Zhu

Physics Letters B > 2007 > 650 > 5-6 > 369-372

We study the low-lying scalar mesons of light u, d, s flavors in the QCD sum rule. Having all possible combinations of tetraquark currents in the local form, QCD sum rule analysis has been carefully performed. We found that using the appropriate tetraquark currents, the masses of σ, κ, f0 and a0 mesons appear in the region of 0.6–1 GeV with the expected ordering. The results are compared with that...

article

A new N∗(1675) resonance in the γN→ηN reaction

Ki-Seok Choi, Seung-Il Nam, Atsushi Hosaka, Hyun-Chul Kim

Physics Letters B > 2006 > 636 > 5 > 253-258

We study the η-photoproduction focusing on the new nucleon resonance which was observed at s=1675MeV with a narrow decay width (∼10MeV) in the recent GRAAL experiment. Using an effective Lagrangian approach, we compute differential cross sections for the η-photoproduction. In addition to N∗(1675), we employ three other nucleon resonances, i.e., N∗(1535), N∗(1650) and N∗(1710), and vector meson exchanges...

article

Suppression of Θ+(JP=3/2±)-photoproduction from the proton

Seung-Il Nam, Atsushi Hosaka, Hyun-Chul Kim

Physics Letters B > 2006 > 633 > 4-5 > 483-487

We investigate the photoproduction of Θ+ from the proton and neutron, γN→K¯Θ+. Assuming that spin and parity of Θ+ are JP=3/2±, it is shown that the production from the proton is strongly suppressed as compared with that from the neutron. This could provide a possible explanation for the null results of the recent CLAS experiment in finding Θ+ via the reaction γp→K¯0Θ+.

article

Threshold production of the Θ+ in a polarized proton reaction

Seung-Il Nam, Atsushi Hosaka, Hyun-Chul Kim

Physics Letters B > 2004 > 602 > 3-4 > 180-184

We compute the cross sections of the Θ+ production near threshold for a polarized proton reaction, p→p→→Σ+Θ+ which was recently proposed to determine unambiguously the parity of Θ+. Within theoretical uncertainties the cross sections for the allowed spin configuration are estimated; it is of order of one microbarn for the positive parity Θ+ and about 1/10 microbarn for the negative parity Θ+ in the...

article

Pentaquark states in a chiral potential

Atsushi Hosaka

Physics Letters B > 2003 > 571 > 1-2 > 55-60

We discuss a possible interpretation for the pentaquark baryon Θ ⁺ which has an exotic quantum number of strangeness S=+1. The role of the pion which modifies the structure of single-particle levels of quarks is examined. When the pion field is sufficiently strong, the ground state of five quarks for Θ ⁺ acquires positive parity. If this is the case, an excited state may appear slightly...

article

Proton-proton bremsstrahlung at the threshold region of the pion production

Masahiro Yamaguchi, Atsushi Hosaka

Nuclear Physics, Section A > 2003 > 721 > Complete > C735-C738

Squared matrix elements for the correlation between the nucleon-pole and pion-loop amplitudes are calculated in order to investigate an observed cusp-like structure in proton-proton bremsstrahlung at the threshold region of the pion production. The results so far including only one-pion-exchange mechanism between two protons shows little evidence for such a cusp-like structure at the pion threshold.

article

Chiral symmetry of baryons

Atsushi Hosaka, Daisuke Jido, Makoto Oka

Nuclear Physics, Section A > 2003 > 721 > Complete > C705-C710

Chiral symmetry aspects for baryon properties are studied. After a brief discussion on general framework, we introduce two distinctive chiral group representations for baryons: the naive and mirror assignments. Using linear sigma models, nucleon properties are studied in both representations. Finally, we propose an experiment to distinguish the two assignments in pion and eta productions.

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Search results for: Atsushi Hosaka

Inhibitory assay for degradation of collagen IV by cathepsin B with a surface plasmon resonance sensor

Heavy hadrons in nuclear matter

Heavy pentaquark states Pc(4380) and Pc(4450) in the J/ψ production induced by pion beams off the nucleon

Production and decay of charmed baryons

Quantum processes in short and intensive electromagnetic fields

Exotic dibaryons with a heavy antiquark

Laser pulse-shape dependence of Compton scattering

Spin degeneracy in multi-hadron systems with a heavy quark

Composite and Elementary Components in Hadron Resonances

Contribution of N* and Δ* Resonances in $${K^*\Sigma}$$ (1190) Photoproduction

A hidden local symmetry approach to rho-meson photoproduction

Meson-baryon nature of the Λ(1405) in chiral dynamics

Chiral properties of baryon interpolating fields

QCD sum rule study of the masses of light tetraquark scalar mesons

A new N∗(1675) resonance in the γN→ηN reaction

Suppression of Θ+(JP=3/2±)-photoproduction from the proton

Threshold production of the Θ+ in a polarized proton reaction

Pentaquark states in a chiral potential

Proton-proton bremsstrahlung at the threshold region of the pion production

Chiral symmetry of baryons

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