Dynamical coupled-channels study of hadron resonances and strangeness production Hiroyuki Kamano (RCNP, Osaka U.) in collaboration with B. Julia-Diaz (Barcelona U.), T.-S. H. Lee (Argonne), A. Matsuyama (Shizuoka U.), S. Nakamura (JLab), T. Sato (Osaka U./KEK), N. Suzuki (Osaka U.) Workshop on “Future Prospects of Hadron Physics at J-PARC and Large Scale Computational Physics”, Tokai, Feb. 9-11, 2012
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Dynamical coupled-channels s tudy of hadron r esonances and strangeness production
Dynamical coupled-channels s tudy of hadron r esonances and strangeness production. Hiroyuki Kamano (RCNP, Osaka U.) in collaboration with B. Julia-Diaz (Barcelona U.), T.-S. H. Lee (Argonne), A. Matsuyama (Shizuoka U.), S. Nakamura ( JLab ), T. Sato (Osaka U./KEK), N. Suzuki (Osaka U.). - PowerPoint PPT Presentation
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Dynamical coupled-channels study of hadron resonances and strangeness production
Hiroyuki Kamano(RCNP, Osaka U.)
in collaboration withB. Julia-Diaz (Barcelona U.), T.-S. H. Lee (Argonne),A. Matsuyama (Shizuoka U.), S. Nakamura (JLab),
T. Sato (Osaka U./KEK), N. Suzuki (Osaka U.)
Workshop on “Future Prospects of Hadron Physics at J-PARC and Large Scale Computational Physics”, Tokai, Feb. 9-11, 2012
Outline
Results of 5-year project on nucleon resonance
extraction at EBAC@JLab
Theory projects for strangeness production
reactions on the nucleons and nuclei
N* spectroscopy : Physics of broad & overlapped resonances
Width: a few hundred MeV. Resonances are highly overlapped in energy except D(1232).
Width: ~10 keV to ~10 MeV Each resonance peak is clearly separated.
Since the late 90s, huge amount of high precision data of meson photo-production reactions on the nucleon target has been reported from electron/photon beam facilities.
JLab, MAMI, ELSA, GRAAL, LEPS/SPring-8, …
Experimental developments
From E. Pasyuk’s talk at Hall-B/EBAC meeting
Total cross sections of meson photoproductions
Opens a great opportunity to make quantitative study of the N* states !!
Objectives and goals:
Through the comprehensive analysis of world data of pN, gN, N(e,e’) reactions,
Determine N* spectrum (pole masses)
Extract N* form factors
(e.g., N-N* e.m. transition form factors)
Provide reaction mechanism information necessary for interpreting N* spectrum, structures and dynamical origins
Research project at Excited Baryon Analysis Center (EBAC) of Jefferson Lab
N* properties
QCD
Lattice QCDHadron Models
Dynamical Coupled-Channels Analysis
Reaction Data
“Dynamical coupled-channels model of meson production reactions”
A. Matsuyama, T. Sato, T.-S.H. Lee Phys. Rep. 439 (2007) 193
Partial wave (LSJ) amplitudes of a b reaction:
Reaction channels:
Transition Potentials:
coupled-channels effect
Exchange potentials bare N* states
For details see Matsuyama, Sato, Lee, Phys. Rep. 439,193 (2007)
Z-diagrams
Dynamical coupled-channels (DCC) model for meson production reactions
Meson-Baryon Green functions
Stable channels Quasi 2-body channels
N p
Dp
D
ppp
r, s r, s
N N
p, r, s, w,..
N N, D
s-channel u-channel t-channel contact
Exchange potentials
Z-diagrams
Bare N* statesN*bare
Dp
N p
p
DDNp
r, s
Can be related with the hadron states of the static hadron structure calculations. (quark models etc.)
core
meson cloud
meson
baryon
Physical N*s will be a “mixture” of the two pictures:
DCC analysis @ EBAC (2006-2009)
p N p N : Analyzed to construct a hadronic part of the model up to W = 2 GeVJulia-Diaz, Lee, Matsuyama, Sato, PRC76 065201 (2007)
p N h N : Analyzed to construct a hadronic part of the model up to W = 2 GeVDurand, Julia-Diaz, Lee, Saghai, Sato, PRC78 025204 (2008)
p N p p N : First fully dynamical coupled-channels calculation up to W = 2 GeVKamano, Julia-Diaz, Lee, Matsuyama, Sato, PRC79 025206 (2009)
g(*) N p N : Analyzed to construct a E.M. part of the model up to W = 1.6 GeV and Q2 = 1.5 GeV2
g N p p N : First fully dynamical coupled-channels calculation up to W = 1.5 GeV Kamano, Julia-Diaz, Lee, Matsuyama, Sato, PRC80 065203 (2009)
Extraction of N* pole positions & new interpretation on the dynamical origin of P11 resonancesSuzuki, Julia-Diaz, Kamano, Lee, Matsuyama, Sato, PRL104 065203 (2010)
Stability and model dependence of P11 resonance poles extracted from pi N pi N dataKamano, Nakamura, Lee, Sato, PRC81 065207 (2010)
Extraction of gN N* electromagnetic transition form factorsSuzuki, Sato, Lee, PRC79 025205 (2009); PRC82 045206 (2010)
Hadronic part
Electromagnetic part
Extraction of N* parameters
pN, hN, ppN (pD, rN, sN) coupled-channelscalculations were performed.
Dynamical coupled-channels effect on N* spectrum
Pole positions and dynamical origin of P11 resonances