Summary of Workshop?
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Summary of Workshop? K.Imai (Kyoto) It is impossible to summarize all talks More and more data of the peak for + We still don’t know what is + Other exotics are also observed? We need more data and calculations Lets encourage exotics hunters K.Imai: Exotics 04/2/19 (Kyoto)
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K.Imai: Exotics 04/2/19 (Kyoto). Summary of Workshop?. K.Imai (Kyoto) It is impossible to summarize all talks More and more data of the peak for Q + We still don’t know what is Q + Other exotics are also observed? We need more data and calculations Lets encourage exotics hunters. - PowerPoint PPT Presentation
Transcript of Summary of Workshop?
Summary of Workshop? K.Imai (Kyoto) It is impossible to summarize all talks More and more data of the peak for +
We still don’t know what is +
Other exotics are also observed? We need more data and calculations Lets encourage exotics hunters
K.Imai: Exotics
04/2/19 (Kyoto)
Sad story of old exotics Z* (old pentaquark) magic 15 years cycle Baryonium disappearence of beautiful peak Sextuquark (NN dibaryon) no more phase shift analysis no more stable H-dibaryon Motivation of KEK-PS K2,K3 beamlines
Discovery of Lambpha
Phys. Rev. Lett. 87 (2001) 212502.
Invariant mass
J.K.Ahn et al., (E224)Phys. Lett. B444 (98) 267
C.J.Yoon: new experiment
Happy story (hopefully) of +
154010 MeV< 25 MeVGaussian significance 4.6
backgroundT. Nakano et al.,
Phys.Rev.Lett. 91 (2003) 012002
Renaissance of hadron spectroscopy !
Summary of positive results
Experiment LEPS/SPring-8 DIANA CLAS(d) SAPHIR ITEP() CLAS(p) HERMES ITEP(p) ZEUS
: 1540 10 5 : 1539 2 few: 1542 2 5: 1540 4 2: 1533 5: 1555 1 10: 1528 2.6 2.1: 1526 3 3: 1527+ 2
: 25: 9: 21: 25: 20: 26 7: 19 5 2: 24: 23
Mass (MeV) (MeV)
Y. Mao
S.Chekanov
Yajun Mao for HERMES Collaboration, YITP Multi-quark Workshop, Feb. 17-19, 2004
Comparison With Other Experiments
For a better comparison, take result from simply BG fitting Left panel: mass average = 1532±2.4MeV (take ±3MeV of syst. error for ITEP, DIANA) Right panel: width FWHM (include detector resolution)
Increasing number of papers
What is +? Theorest’s answer
Chiral Soliton Quark model conventional correlated diquark Hadronic bound state Others
Jaffe, Lutz, Oka, Ko Hosaka, Kim, Ma, Gerasy
uta
What is + ? Experimentalists should answer
Mass 1526 - 1555 MeV 1 or 2 resonance Width Upper limit ? 1MeV from KN PSA ?
Spin-parity 1/2+ 1/2- 3/2+ 3/2- ?
Other member of anti-decuplet ? we need dedicated experiment at + factory high statistics high resolution Jlab, SP8, KEK,,, H.Gao, K.I
To establish anti-decuplet - -
n K- -> K+ - - , p K- -> K+ + - - +
p K- -> K0 - +
S=-2 S=0 Diakonov 2070 1710 MeV Jaffe, Wilczek 1750 1440 MeV
If M(--) ~ 1750 MeV (Jaffe & Wilczek, hep-ph/0307341) >2GeV/c K- beam (BNL or KEK or (J-PARC)) !
S=-2 Penta-quark -- IK Yoo （ NA49 collaboration ） M=1862 MeV <18 MeV hep-ex/0310014
“Experimental” data from Lattice QCD A.Nakamura, S.Sasaki, N.Mathur
1/2- is lower than 1/2+ ?
+ was found ? Yes and No
-> need more “ L-QCD experiments”
Quartet quark ? New data from B-factories Yamamoto / Terasaki, Ko
DsJ D** J/ Scalar meson Jaffe, Kunihiro, Harada, Nakamura
revisit to long standing problem Chiral symmetry diquark correlation
Why precise cancellation of attractive and repulsive NN force occur to create human being? Degree of chiral symmetry breaking or diquark correlation or God ?
(1405) and Kaonic-nuclei Nemoto, Ahn, Hyodo, Akaishi, Yamazaki, Dote
(1405) another longstanding problem 3 quark or “pentaquark” ? Kaonic-nuclei may open new aspect of
manybody problem with strangeness New data is coming (after 30 years) Experimental and theoretical works are accele
rated by + effect!
Conclusion Exciting period for exotic hadron physics
has come.
We have many thing to do in next 15 years until exotics becomes nonexotic
physics.
謝辞Thank you very much for joining this works
hop !
A lot of thanks to supporting staffs, Ms. Tsuruhara, Takami, Yagi, Okada, Arimoto, Endo
Mr. Takimi, Nawa Kojo, Tsumura, Kitazawa
