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.

LENS, NOV. 11, 2006

Happy Birthday to Prof. Min!

We all appreciate your efforts on

Nuclear Physics Community in Korea!