Shin Nan Yang National Taiwan University .


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Diagram . MotivationMeson-trade model underneath 400 MeVExtension to higher energiesDynamical model for pion photoproductionResultsConclusion . . Inspiration. Point: To concentrate baryon reverberation parameters from ?N disseminating and pion photoproduction Test of Theoretical Predictions (Quark Models, Lattice QCD) ) Need a coupled-channel dynamical mode
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Slide 1

Shin Nan Yang National Taiwan University Collaborators: Guan Yeu Chen ( T aipei) Sabit S. Kamalov ( D ubna) D. Drechsel, L. Tiator ( M ainz) DMT dynamical model tenth International Workshop on "Meson-Nucleon Scatterings and Nucleon Structure", Aug. 29 – September 4, 2004, Beijing, China.

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Outline Motivation Meson-trade demonstrate underneath 400 MeV Extension to higher energies Dynamical model for pion photoproduction Results Conclusion

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Motivation Aim: To concentrate baryon reverberation parameters from N dissipating and pion photoproduction Test of Theoretical Predictions (Quark Models, Lattice QCD) ) Need a coupled-channel dynamical model This discussion: S 11 channel just

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There are 44 nonstrange baryon states recorded in PDG2002 T = 1/2, 22 states = 3/2, 22 states Large instabilities still exist in the separated properties, notwithstanding for 4-star states. E.g., for S 11 (1535) = 60, 120(20), 151(27), 151-198, 270(50) M eV A p 1/2 = 60 (  ), 100 (  ) x 10 - 3 GeV - 1/2

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Meson-trade  N show underneath 400 MeV

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Three-dimensional lessening Cooper-Jennings decrease conspire

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Choose to be given by

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C.T. Hung, S.N. Yang, and T.- S.H. Lee, Phys. Rev. C64, 034309 (2001)

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Extension to higher energies coupled  ,  , 2  channels Include resonances R\'s with couplings to  ,  , 2  channels

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2R 3R 4R

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- 1R 2R 3R No confirmation for the fourth S 11 reverberation in  N !  N

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Extraction of reverberation parameters

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BES:  (R 1 )=95(25) MeV

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Dynamical model for  N !  N To request e, the t-grid for  N !  N is composed as t  (E) = v  +  k v k g k (E) t k N (E), (1) where, v k = move potential, two fixings t kN (E) = k N t-grid, g k (E) = . v  and t  N Multipole deterioration of (1) gives the physical abundancy in channel  =(  , l  , j), (with  N moderate states ignored) where  () , R ( ) :  N dissipating stage move and response framework in channel  k=| k|, q E : photon and pion on-shell energy v k , t k N

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Both on-& off-shell

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DMT Model

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In DMT , we surmised the reverberation commitment A R  (W,Q 2 ) by the accompanying Breit-Winger shape with f  R = Breit-Winger consider portraying the rot of the reverberation R  R (W) = add up to width M R = physical mass ( W) = to modify the period of the aggregate multipole to be equivalent to the comparing  N stage move  (  ) . Take note of that

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Pion cloud

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 2 =64 full Need 4 S 11 Resonances  2 =3.5

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Extraction of helicity amplitudes

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Summary The DMT coupled-channel dynamical model gives fantastic depiction of the pion scrambling and pion photoproduction information in S 11 channel from edge to 2 GeV Background commitments turn out to be huge and negative in the area of S 11 (1535) substantially bigger reverberation commitment required

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As in the  channel, pion cloud impacts is essential in S 11 divert in both edge and resonances district For the main S 11 (1535) reverberation, we acquire

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Our investigation at energies higher than 1750 MeV yields significant quality, which can be portrayed by a third and a fourth S11 reverberation with masses 1846(47) and 2113(70) MeV, in great concurrence with the expectation of HCQM Extension to different channels is in progress

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The End

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In CM outline,

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Cooper-Jennings diminishment plot

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