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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.

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slide1

Vector and Axial-vector structures of theQ+

Hyun-Chul Kim

NuRI & Department of Physics,

Pusan National University

Busan, Korea

Collaborators: T. Ledwig, M.V. Polyakov, K. Goeke

Chiral07, Nov. 13, 2007

slide2

Motivation

CLAS Results

  • Very recent CLAS experiments to search for : Null results!

K* Exchange is of great importance in describing the above reactions!

KNQcoupling must be very small!

  • Another recent DIANA experiment to search for

,

  • V.V. Barmin et al. [DIANA Collaboration] arXiv :hep-ex / 0603017

Cross sections of

Cross sections of

: 0.8 nb in 90% CL

: 3nb in 90% CL

New results on

will be reported from the LEPS soon.

Chiral07, Nov. 13, 2007

slide3

Transition Form factors

coupling constant for NQK*

coupling constant for NQK

Chiral07, Nov. 13, 2007

slide4

Hedgehog Ansatz:

Selfconsistent Soliton:

SU(3) χQSM

Chiral07, Nov. 13, 2007

slide5

SU(3) χQSM

Chiral07, Nov. 13, 2007

slide6

: Imbedding into SU(3)

Collective Quantization

Chiral07, Nov. 13, 2007

slide7

Form factors in the cQSM

Example:

Chiral07, Nov. 13, 2007

slide8

Results

Chiral07, Nov. 13, 2007

slide9

Results

Mixing parameter for the octet & antidecuplet

Chiral07, Nov. 13, 2007

slide10

Vector meson dominance

Vector meson dominance: Current Field Identity (CFI)

Riazuddin-Fayyazuddin relation

Chiral07, Nov. 13, 2007

slide11

Results

Oh et al.:

No tensor couplings!

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!

Chiral07, Nov. 13, 2007

slide12

Results

Leading contributions are almost cancelled by the rotational corrections!

Chiral07, Nov. 13, 2007

slide13

Results

For the nucleon

A. Silva, HChK, D.Urbano, K. Goeke

Phys. Rev. D 72 (2005) 094011

Chiral07, Nov. 13, 2007

slide14

Results

Chiral07, Nov. 13, 2007

slide15

Summary and Conclusion

  • We investigated the vector and axial-vector transition form factors for N Q transitions, based on the chiral quark-soliton model.
  • For the electric transition, the wave-function correction 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 collaboration (T. Nakano).

Chiral07, Nov. 13, 2007

slide16

Thank you very much!

Chiral07, Nov. 13, 2007