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Journal Articles

$$N Omega$$ interaction; Meson exchanges, inelastic channels, and quasibound state

Sekihara, Takayasu; Kamiya, Yuki*; Hyodo, Tetsuo*

Physical Review C, 98(1), p.015205_1 - 015205_20, 2018/07

 Times Cited Count:9 Percentile:20.26(Physics, Nuclear)

Journal Articles

Possible $$eta ^{prime} d$$ bound state and its $$s$$-channel formation in the $$gamma d to eta d$$ reaction

Sekihara, Takayasu; Fujioka, Hiroyuki*; Ishikawa, Takatsugu*

Physical Review C, 97(4), p.045202_1 - 045202_9, 2018/04

 Times Cited Count:3 Percentile:52.23(Physics, Nuclear)

Journal Articles

Theoretical analysis on the $$K^{-3}$$He $$rightarrow Lambda pn$$ reaction for the $$bar{K} N N$$ bound-state search in the J-PARC E15 experiment

Sekihara, Takayasu; Oset, E.*; Ramos, A.*

Proceedings of Science (Internet), 310, 5 Pages, 2018/03

Journal Articles

What makes the peak structure of the $$Lambda p$$ invariant-mass spectrum in the $$K^{-3} rm He rightarrow Lambda$$$$pn$$ reaction?

Sekihara, Takayasu; Oset, E.*; Ramos, A.*

Acta Physica Polonica B, 48(10), p.1869 - 1874, 2017/10

 Times Cited Count:1 Percentile:82.21(Physics, Multidisciplinary)

Journal Articles

Exotic hadrons from heavy ion collisions

Cho, S.*; Hyodo, Tetsuo*; Jido, Daisuke*; Ko, C. M.*; Lee, S. H.*; Maeda, Saori*; Miyahara, Kenta*; Morita, Kenji*; Nielsen, M.*; Onishi, Akira*; et al.

Progress in Particle and Nuclear Physics, 95, p.279 - 322, 2017/07

AA2016-0538.pdf:0.65MB

 Times Cited Count:48 Percentile:13.18(Physics, Nuclear)

With upgraded detectors at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC), it has become possible to measure hadrons beyond their ground states in high energy heavy ion collisions. Therefore, heavy ion collisions provide a new method for studying exotic hadrons that are either molecular states made of various hadrons or compact system consisting of muliquarks. Because their structures are related to the fundamental properties of Quantum Chromodynamics (QCD), studying exotic hadrons is currently one of the most active areas of research in hadron physics. The present review is a summary of the current understanding of a selected set of exotic candidate particles that can be potentially measured in heavy ion collisions.

Journal Articles

Two-body wave functions, compositeness, and the internal structure of dynamically generated resonances

Sekihara, Takayasu; Hyodo, Tetsuo*; Jido, Daisuke*; Yamagata-Sekihara, Junko*; Yasui, Shigehiro*

Proceedings of Science (Internet), 8 Pages, 2017/05

Journal Articles

The Peak structure in the in-flight $$^{3}$$He$$(K^{-}, Lambda p) n$$ reaction around the $$bar{K} N N$$ Threshold

Sekihara, Takayasu; Oset, E.*; Ramos, A.*

JPS Conference Proceedings (Internet), 13, p.020002_1 - 020002_5, 2017/02

Journal Articles

Two-body wave functions and compositeness from scattering amplitudes; General properties with schematic models

Sekihara, Takayasu

Physical Review C, 95(2), p.025206_1 - 025206_16, 2017/02

AA2016-0539.pdf:1.06MB

 Times Cited Count:8 Percentile:27.73(Physics, Nuclear)

Journal Articles

On the structure observed in the in-flight $$^{3}$$He($$K^{-}, Lambda p)n$$ reaction at J-PARC

Sekihara, Takayasu; Oset, E.*; Ramos, A.*

Progress of Theoretical and Experimental Physics (Internet), 2016(12), p.123D03_1 - 123D03_27, 2016/12

AA2016-0237.pdf:1.53MB

 Times Cited Count:30 Percentile:10.89(Physics, Multidisciplinary)

Journal Articles

Theoretical study of photoproduction of an $$eta ^{prime} N$$ bound state on a deuteron target with forward proton emission

Sekihara, Takayasu; Sakai, Shuntaro*; Jido, Daisuke*

Physical Review C, 94(2), p.025203_1 - 025203_11, 2016/08

AA2016-0236.pdf:0.92MB

 Times Cited Count:4 Percentile:56.91(Physics, Nuclear)

Oral presentation

Theoretical study of photoproduction of $$eta ^{prime} N$$ bound state on deuteron target with forward proton emission

Sekihara, Takayasu; Sakai, Shuntaro*; Jido, Daisuke*

no journal, , 

Oral presentation

Oral presentation

On the structure observed in the in-flight $$^{3}$$He$$(K^{-}, Lambda p)n$$ reaction at J-PARC

Sekihara, Takayasu; Oset, E.*; Ramos, A.*

no journal, , 

Oral presentation

Two-body wave functions and compositeness from scattering amplitudes

Sekihara, Takayasu

no journal, , 

In this contribution, I introduce the physical meaning of the compositeness, its expression, and theoretical evaluation in effective models. In particular, we show that the two-body wave function of the bound state corresponds to the residue of the scattering amplitude at the bound state pole, which means that solving the Lippmann-Schwinger equation at the bound state pole is equivalent to evaluating the two-body wave function of the bound state. Then, we evaluate the compositeness for the so-called dynamically generated resonances in the chiral unitary approach, such as $$Lambda (1405)$$, $$N (1535)$$, and $$N (1650)$$, and investigate their internal structure in terms of the hadronic molecular components.

Oral presentation

Wave function of a bound state in quantum mechanics

Sekihara, Takayasu

no journal, , 

From the scattering amplitude we can extract automatically normalized two-body wave functions for general bound states. Thanks to this fact, we can discuss the internal structure of hadronic molecule candidates in terms of their two-body wave functions from scattering amplitudes.

Oral presentation

On the structure observed in the in-flight $$^{3}$$He($$K^{-}, Lambda p)n$$ reaction at J-PARC

Sekihara, Takayasu; Oset, E.*; Ramos, A.*

no journal, , 

Oral presentation

Compositeness for the $$N^{ast}$$ and $$Delta ^{ast}$$ resonances from the $$pi N$$ scattering amplitude

Sekihara, Takayasu

no journal, , 

The meson-baryon components for the $$N^{ast}$$ and $$Delta ^{ast}$$ resonances can be investigated in terms of the compositeness, which is defined as the norm of the two-body wave function from the meson-baryon scattering amplitudes. For this purpose I first show that one can calculate the two-body wave function from the scattering amplitudes (not by the Schrodinger equation) by considering several schematic models. Then I explain my plan to evaluate $$N^{ast}$$/$$Delta ^{ast}$$ compositeness from the $$pi N$$ scattering amplitudes, which has been determined precisely in the partial wave analyses.

Oral presentation

On the structure observed in the in-flight $$^{3}$$He($$K^{-}, Lambda p)n$$ reaction at J-PARC

Sekihara, Takayasu; Oset, E.*; Ramos, A.*

no journal, , 

Oral presentation

Is the $$N Omega$$ dibaryon system bound in a meson exchange model?

Sekihara, Takayasu; Kamiya, Yuki*; Hyodo, Tetsuo*

no journal, , 

Recently, the HAL QCD simulation pointed out that the $$N Omega$$ interaction is strongly attractive enough to generate a bound state with spin/parity $$J^{P} = 2^{+}$$. In this talk, we investigate the origin of the attraction of the $$N Omega$$ interaction by constructing a meson exchange model. Between $$N$$ and $$Omega$$, $$eta$$ and scalar-isoscalar ("$$sigma$$") mesons can be exchanged. The couplings between the $$eta$$ meson and baryons are fixed by the effective Lagrangian based on flavor symmetry. For the "$$sigma$$" exchange, on the other hand, we employ the correlated two meson exchange developed in the study of the nuclear force. We discuss whether the $$N Omega$$ interaction is attractive or not and whether the attraction is strong enough to generate the $$N Omega$$ bound state or not.

Oral presentation

The $$N Omega$$ interaction; Meson exchanges, inelastic channels, and quasibound state

Sekihara, Takayasu; Kamiya, Yuki*; Hyodo, Tetsuo*

no journal, , 

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