Magnetic and axial-vector transitions of the baryon antidecuplet
description
Transcript of Magnetic and axial-vector transitions of the baryon antidecuplet
LENS, NOV. 11, 2006
Magnetic and axial-vector transitions
of the baryon antidecuplet
Collaborators: Ghil-Seok Yang, Klaus Goeke
Hyun-Chul Hyun-Chul KimKim
NuRI & Department of Physics, Pusan National University
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Outline
Motivation
Magnetic transitions Axial-vector transitions
General Formalism in the SU(3)f χQSM “model - independent
approach” Results
Transition magnetic moment for baryons Decay width of with axial-vector coupling constants
Summary
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Motivation Magnetic
transitions Photoproduction off the neutron at the GRAAL
“ Evidence for a resonant structure at W ~ 1.675 GeV ” V.Kuznetsov [GRAAL Collaboration], arXiv:hep-ex/0409032
[Update : hep-ex / 0606065]
New nucleon-like Resonance
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Motivation
The SELEX data:
V.V. Molchanov et al. [SELEX Collaboration], Phys. Lett. B. 590(2004) 161
Decay width and magnetic transitions
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Motivation Axial-vector
transitions Very recent CLAS experiments to search for :
Null results!
M. Battaglieri et al. [CLAS Collaboration] Phys.Rev.Lett.96:042001,2006
B. McKinnon et al. [CLAS Collaboration] Phys.Rev.Lett.96:212001,2006
Another recent DIANA experiment to search for
, V.V. Barmin et al. [DIANA Collaboration] arXiv :hep-ex / 0603017
Several new experiments in progress [LEPS, KEK-PS E522]
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General Formalism in the SU(3)f χQSM
Collective Hamiltonian in the SU(3)f QSM
SU(3)f symmetric SU(3)f symmetric breaking
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General Formalism in the SU(3)f χQSM
1
♠ Wave function correction
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General Formalism in the SU(3)f χQSM
=1
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“model - independent approach” The transition magnetic
momentsexperimental data for the octet magnetic moments as an input , minimizing the mean square deviation for the octet magnetic moments
= ;
Dynamical parameters
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“model - independent approach”
2006 PDG
G-S.Yang, H-Ch,Kim, M.Praszalowicz and K.Goeke, Phys.Rev D 70, 114002(2004)
2006 PDG
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“model - independent approach” The transition axial-vector coupling
constants the experimental data for the hyperon semileptonic decay as an input .
Dynamical parameters
Input[40] S.D. Bass, Rev.Mod.Phys. 77 (2005) 1257
[31] 2006 PDG
[39] 2006 PDG (KTeV)
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Results
The transition magnetic moments
GRAAL
SELEX
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Results
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Results
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Results
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Results
:
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Results
Consistent with the GRAAL data
MAID reproduced the GRAAL data with the
present work H-ChK, M. Polyakov, M. Praszalowicz, G-S.Yang, and K.Goeke, Phys. Rev. D 71, 094023(2005)
[KeV]
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Results
The axial-vector coupling constant for
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Results
decay width:: Diakonov, Petrov, Polyakov
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Results
The decay width of in SU(3) flavor symmetry
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Results
The decay width of in SU(3) flavor symmetry breaking
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Summary & Conclusion
• In this talk, we presented recent investigations on the magnetic and axial-vector transitions from the baryon antidecuplet, in particular, to the baryon octet, based on the SU(3) chiral quark-soliton model in a model-independent approach (more general than the work by Diakonov et al.)
• We used the octet magnetic moments and hyperon semileptonic decay constants as input to fix dynamical parameters.
• The results of the magnetic transitions are shown to describe the recent GRAAL data as well as the SELEX.
• The axial-vector constant for was predicted and the decay width of the was studied: The decay width of seems to be constraint by the singlet axial vector constant. With =0.3-0.37, the decay width of the turns out to be smaller than 1 MeV.
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Happy Birthday to Prof. Min!
We all appreciate your efforts on
Nuclear Physics Community in Korea!