vector and axial-vector structures of the q+
DESCRIPTION
Vector and Axial-vector structures of the Q+. Hyun-Chul Kim. NuRI & Department of Physics, Pusan National University Busan , Korea. Collaborators: T . Ledwig , M.V. Polyakov , K. Goeke. Motivation. CLAS Results. - PowerPoint PPT PresentationTRANSCRIPT
Chiral07, Nov. 13, 2007
Vector and Axial-vector structures of the Q+
Hyun-Chul Kim
NuRI & Department of Physics, Pusan National University
Busan, KoreaCollaborators: T. Ledwig, M.V. Polyakov, K. Goeke
Chiral07, Nov. 13, 2007
MotivationCLAS Results
Very recent CLAS experiments to search for : Null results!Cross sections of : 0.8 nb in 90% CL
Cross sections of : 3nb in 90% CL
K* Exchange is of great importance in describing the above reactions!
Another recent DIANA experiment to search for
, V.V. Barmin et al. [DIANA Collaboration] arXiv :hep-ex / 0603017
New results on will be reported from the LEPS soon.
KNQ coupling must be very small!
Chiral07, Nov. 13, 2007
Transition Form factors
coupling constant for NQK* coupling constant for NQK
Chiral07, Nov. 13, 2007
Hedgehog Ansatz:
SU(3) χQSM
5( ) ~i i i
A Ai i
i occ
i MU
x
+
5( ) exp( ( ) )A AiU x xf
Selfconsistent Soliton:
Chiral07, Nov. 13, 2007
SU(3) χQSM
Chiral07, Nov. 13, 2007
Collective Quantization
: Imbedding into SU(3)
Chiral07, Nov. 13, 2007
Form factors in the cQSM
Example:
Chiral07, Nov. 13, 2007
Results
Chiral07, Nov. 13, 2007
Results
Mixing parameter for the octet & antidecuplet
Chiral07, Nov. 13, 2007
Vector meson dominanceVector meson dominance: Current Field Identity (CFI)
Riazuddin-Fayyazuddin relation
Chiral07, Nov. 13, 2007
Results
Oh et al.:
Nam, Hosaka, HChK::
The present predictions turn out to be much smaller than the above references!The tensor coupling is finite and is of the same order of the vector coupling!
No tensor couplings!
Chiral07, Nov. 13, 2007
Results
Leading contributions are almost cancelled by the rotational corrections!
Chiral07, Nov. 13, 2007
Results
For the nucleonA. Silva, HChK, D.Urbano, K. GoekePhys. Rev. D 72 (2005) 094011
Chiral07, Nov. 13, 2007
Results
• We investigated the vector and axial-vector tran-sition form factors for N Q transitions, based on the chiral quark-soliton model.
• For the electric transition, the wave-function cor-rection turns out to be of leading order (generalized Ademollo-Gatto theorem).
• The K* and K coupling constants are obtained to be very small.
• The width of the Q is shown to be less than 1 MeV.
• We anticipate the new result of the LEPS collabo-ration (T. Nakano).
Chiral07, Nov. 13, 2007
Summary and Conclusion
Chiral07, Nov. 13, 2007
Thank you very much!