scholarly journals Dynamically generated hadronic states in the K̅N and ηN coupled-channels interactions

2018 ◽  
Vol 181 ◽  
pp. 01012
Author(s):  
Aleš Cieplý
Keyword(s):  
Bound States ◽  
Kaonic Atoms ◽  
Coupled Channels ◽  
Theoretical Predictions ◽  
Channel Interactions ◽  
Hadronic States

We compare and review the theoretical predictions for the K̅N and ηN elastic amplitudes where sizable variations are found among the considered approaches, especially at subthreshold energies relevant for studies of kaonic atoms and meson-nuclear quasi-bound states. Conditions for an appearance of dynamically generated states in meson-baryon multi-channel interactions are established and discussed for the K̅N and ηN systems.

scholarly journals Molecular $$\Xi _{bc}$$ states from meson–baryon interaction

2019 ◽  
Vol 79 (12) ◽  
Author(s):  
Qi-Xin Yu ◽  
J. M. Dias ◽  
Wei-Hong Liang ◽  
E. Oset
Keyword(s):  
Bound States ◽  
Baryon Interaction ◽  
Experimental Search ◽  
Quantum Numbers ◽  
Coupled Channels ◽  
Sufficient Intensity

AbstractWe have studied the meson–baryon interaction in coupled channels with the same quantum numbers of $$\Xi _{bc}$$Ξbc. The interaction is attractive in some channels and of sufficient intensity to lead to bound states or resonances. We use a model describing the meson–baryon interaction based on an extrapolation of the local hidden gauge approach to the heavy sector, which has been successfully used in predicting $$\Omega _c$$Ωc and hidden charm states. We obtain many states, some of them narrow or with zero width, as a consequence of the interaction, which qualify as molecular states in those channels. The success in related sectors of the picture used should encourage the experimental search for such states.

scholarly journals On the widths and binding energies of K− nuclear states and the role of K− multi-nucleon interactions

2018 ◽  
Vol 181 ◽  
pp. 01009
Author(s):  
Jaroslava Hrtankova ◽  
Jiří Mareš
Keyword(s):  
Bound States ◽  
Binding Energies ◽  
Many Body ◽  
Nucleon Interaction ◽  
Substantial Impact ◽  
Coupled Channels ◽  
Self Consistent ◽  
Interaction Term ◽  
Many Body Systems

We report on our recent self-consistent calculations of K− nuclear quasi-bound states using K− optical potentials derived from chirally motivated meson-baryon coupled channels models [1, 2]. The K− single-nucleon potentials were supplemented by a phenomenological K− multi-nucleon interaction term introduced to achieve good fits to K− atom data. We demonstrate a substantial impact of the K− multi-nucleon absorption on the widths of K− nuclear states. If such states ever exist in nuclear many-body systems, their widths are excessively large to allow observation.

QUANTIZED INTRINSICALLY LOCALIZED MODES: LOCALIZATION THROUGH INTERACTION

2012 ◽  
Vol 11 ◽  
pp. 12-21
Author(s):  
PETER S. RISEBOROUGH
Keyword(s):  
Neutron Scattering ◽  
Experimental Observation ◽  
Phonon Spectrum ◽  
Bound States ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Localized Modes ◽  
Scattering Spectrum ◽  
Theoretical Predictions ◽  
Quartic Anharmonicity

We have calculated the lowest energy quantized spectra of Intrinsically Localized Modes (ILMs) for the Fermi-Pasta-Ulam lattices. The quantized ILM spectra are composed of resonances in the two-phonon continuum and branches of infinitely long-lived excitations that are bound states formed from even numbers of phonons. For quartic anharmonicity and one atom per unit cell, the calculated ILMs are consistent with the results of previous calculations using the number conserving approximation. However, by contrast the ILM spectrum of the lattice with cubic interactions couples resonantly with the single-phonon spectrum and cannot be calculated within a number conserving approximation. Furthermore we argue that, by introducing a sufficiently strong cubic non-linearity, the quantized ILMs can be observed directly through the single-phonon inelastic neutron scattering spectrum. We compare our theoretical predictions with the recent experimental observation of breathers in NaI by Manley et al.

scholarly journals APPLICATION OF JAIN AND MUNCZEK'S BOUND-STATE APPROACH TO γγ-PROCESSES OF π0, ηc AND ηb

1999 ◽  
Vol 14 (02) ◽  
pp. 161-194 ◽  
Author(s):  
DALIBOR KEKEZ ◽  
BOJAN BISTROVIĆ ◽  
DUBRAVKO KLABUČAR
Keyword(s):  
Bound States ◽  
Chiral Limit ◽  
Chiral Symmetry Breaking ◽  
Goldstone Boson ◽  
Bound State ◽  
Quark Propagator ◽  
Axial Anomaly ◽  
B Quarks ◽  
Electromagnetic Processes ◽  
Theoretical Predictions

We point out the problems affecting most quark–antiquark bound-state approaches when they are faced with the electromagnetic processes dominated by Abelian axial anomaly. However, these problems are resolved in the consistently coupled Schwinger–Dyson and Bethe–Salpeter approach. Using one of the most successful variants of this approach, we find the dynamically dressed propagators of the light u and d quarks, as well as the heavy c and b quarks, and find the Bethe–Salpeter amplitudes for their bound states π0, ηc and ηb. Thanks to incorporating the dynamical chiral symmetry breaking, the pion simultaneously appears as the (pseudo)Goldstone boson. We give the theoretical predictions for the γγ decay widths of π0, ηc and ηb, and for the π0γ⋆→γ transition form factor, and compare them with experiment. In the chiral limit, the axial-anomaly result for π0→γγ is reproduced analytically in the consistently coupled Schwinger–Dyson and Bethe–Salpeter approach, provided that the quark–photon vertex is dressed consistently with the quark propagator, so that the vector Ward–Takahashi identity of QED is obeyed. On the other hand, the present approach is also capable of quantitatively describing systems of heavy quarks, concretely ηc and possibly ηb, and their γγ-decays. We discuss the reasons for the broad phenomenological success of the bound-state approach of Jain and Munczek.

scholarly journals CHIRAL UNITARY DYNAMICS OF HADRONS AND HADRONS IN A NUCLEAR MEDIUM

2009 ◽  
Vol 18 (05n06) ◽  
pp. 1389-1403 ◽  
Author(s):  
E. OSET ◽  
L. S. GENG ◽  
D. GAMERMANN ◽  
M. J. VICENTE VACAS ◽  
D. STROTTMAN ◽  
...  
Keyword(s):  
Bound States ◽  
Recent Experiment ◽  
Complex Structure ◽  
Axial Vector ◽  
Vector Mesons ◽  
Roper Resonance ◽  
Nucleon System ◽  
Coupled Channels ◽  
Pseudoscalar Mesons ◽  
Baryon Resonances

In this talk I summarize recent findings around the description of axial vector mesons as dynamically generated states from the interaction of pseudoscalar mesons and vector mesons, dedicating some attention to the two K1(1270) states. Then I review the generation of open and hidden charm scalar and axial states, and how some recent experiment supports the existence of the new hidden charm scalar state predicted. I present recent results showing that the low lying 1/2+ baryon resonances for S = -1 can be obtained as bound states or resonances of two mesons and one baryon in coupled channels. Then show the differences with the S = 0 case, where the N*(1710) appears also dynamically generated from the two pion one nucleon system, but the N*(1440) does not appear, indicating a more complex structure of the Roper resonance. Finally I shall show how the state X(2175), recently discovered at BABAR and BES, appears naturally as a resonance of the [Formula: see text] system.

Coupled channels approach to kaonic atoms

1977 ◽  
Vol 70 (4) ◽  
pp. 401-404 ◽  
Author(s):  
M. Thies
Keyword(s):  
Kaonic Atoms ◽  
Coupled Channels

The light-cone approach for the calculation of hadronic states

1989 ◽  
Vol 67 (12) ◽  
pp. 1162-1167
Author(s):  
Ralph Girard ◽  
Alexander Langnau
Keyword(s):  
Integral Equation ◽  
Numerical Solution ◽  
Quantum Chromodynamics ◽  
Integral Equations ◽  
Light Cone ◽  
Bound States ◽  
Light Cone Quantization ◽  
General Method ◽  
The Continuum ◽  
Hadronic States

We present an application of the recently proposed method of discretized light-cone quantization to quantum chromodynamics (QCD). We present the general method of light-cone quantization and point out its usefulness for the derivation of covariant integral equations for bound states. We then apply it to QCD and obtain the integral equation for the bound states in the valence sector of the mesons. The numerical solution of the integral equation shows a nice transition to the continuum. The conclusion summarizes the main results and discusses briefly what should be the next improvements of this method.

scholarly journals RECENT DEVELOPMENTS IN CHIRAL UNITARY DYNAMICS OF RESONANCES

2008 ◽  
Vol 23 (27n30) ◽  
pp. 2201-2208
Author(s):  
E. OSET ◽  
L. S. GENG ◽  
D. GAMERMANN ◽  
M. J. VICENTE VACAS ◽  
D. STROTTMAN ◽  
...  
Keyword(s):  
Bound States ◽  
Axial Vector ◽  
Vector Mesons ◽  
Coupled Channels ◽  
Pseudoscalar Mesons ◽  
Recent Developments ◽  
Baryon Resonances

In this talk I summarize recent findings made on the description of axial vector mesons as dynamically generated states from the interaction of pseudoscalar mesons and vector mesons, dedicating some attention to the two K1(1270) states. Then I review the generation of open and hidden charm scalar and axial states. Finally, I present recent results showing that the low lying 1/2+ baryon resonances for S=−1 can be obtained as bound states or resonances of two mesons and one baryon in coupled channels dynamics.

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