K' Khosonthongkee, N' Supanam and Y' Yan - PowerPoint PPT Presentation

Title: K' Khosonthongkee, N' Supanam and Y' Yan


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K. Khosonthongkee, N. Supanam and Y. Yan
School of Physics, Suranaree University of
Technology, Nakhon Ratchasima, Thailand
18th International IUPAP Conference on
Few-Body Problems in Physics (FB18)
Santos, São Paulo, Brazil August 24, 2006
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Outline

• Introduction
• The Hybrid Baryon Model
• Interaction Operator
• The transition amplitude for N(1440) decay
• Preliminary Results
• Conclusions

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QCD
Atom
electron
fundamental theory of strong interaction
Nucleus
Low energy
Nucleon
Strong Interaction
???
Model
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understanding
Nucleon internal structure
J 1/2, I 1/2, P1
J 3/2, I 3/2, P1
J 1/2, I 1/2, P1
N(1440)
Intrinsic excitation of Nucleon at energy around
500 Mev
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Simple Model for N(1440)
N(1440) is three-quark with the first radial
excitation
N(1440) too low mass to be radial
excitation
Various quarks models
Met difficulties to explain its mass and
electromagnetic couplings
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N(1440)
Bag Model
TE (transverse electric) TM (transverse magnetic)
qqq G
low mass
TE mode is lowest eigenmode
3 quarks and a TE gluon
N(1440)
q3G
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Nucleon wave function
harmonic oscillator potential
qqq
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harmonic oscillator potential
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harmonic oscillator potential
q3G
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Interaction Operator
Nonreletivistic approximation
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The Transition Amplitude for
Decay
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Expand the total transition amplitude in partial
wave
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Values of Q1 and Q2 for different initial and
final states
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Preliminary Results
Z. Li et.al. Phys. Rev. D. 46 (1992) p70-74
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Thank you for your attention