Jung Keun Ahn @ PNU

Exotic Hadron Spectroscopy@ J-PARC

HaPhy 2005.10.8

Exotic BaryonPentaquarks

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Quantum # cannot be matched by qq’q”.

For SUf(3) , qqq generates

3 x 3 x 3 = 1 + 8s + 8a + 10

For meson-octet +baryon-octet,

8 x 8 = 1 + 8 + 8 + 10 + 10 + 27

Exotic

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Exotic

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=20 MeV=1 MeV

K+d and K+n

Exotic BaryonsExotic

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Exotic BaryonsExotic

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Pentaquark +

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nK+

0spK

Null ResultsExotic

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Null Results Need High Stat

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HERA-

B

PHENIX

Disappeared?Exotic

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Very preliminary

KEK-E522

~2mb

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KEK-PS K2 Beam Line

1.66 GeV/c K-

1.9 GeV/c - +

N(2400)+K-Exotic

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Exotic

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γ

p/nn/p

K+/K0

MMd(γ,K － p) GeV/c2

Quasi-free and non-resonant KKp

Bump structure

γd+ (1520) @ LEPS

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Decay modes studied: Θ+→K0p Λ→pπ- K0 → π+π- Θ+→K+n Λ→pπ-

(n)

(K+)

CLAS very preliminary

Eγ = 0.8 – 1.55 GeV

1) ppπ+π- ()

2) ppπ-π+π- (p)

3) ppπ-K+ (n) (Θ→nK+)

Possible final states:

Search for γ3He→ΛΘ+p

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(1530)

− −

M=1.862± 0.002 GeV

<0.018 GeV

CERN SPS hep-ex/0310014

udssd

dussd

dudss

uddss

0

Combined spectra

- - @ NA49 @ CERN

Negative Results

Exotic

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WA89 +A @ 340 GeV/c.

Also not seen by CDF, BaBar, ZEUS, ALEPH and E690.

Exp Evidence for N*

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GRAAL γnn

N(1680)

N(1730)

New Exotic BaryonsPentaquarks

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Further exotics from STAR and CLAS

Kp

Invariant Mass (GeV/c2)

Invariant Mass (GeV/c2)Invariant Mass (GeV/c2)

pK

S. Kabana, AGS&RHIC Users Meeting

M. Bttaglieri, JLAB Users MeetingJune 16, 2004

Search for ++, 5, 5 in JLab

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simulation

Search for *++ partners in ep e’K-X++

Search for 5 in ep eK+Xo

Search for - in γpK+K+-

-(1862)

Excited States of the +

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Spin-flavor partners, T = 1, JP = 3/2+, to the + are predicted at slightly higher masses than the +.

γp K+n) K0 (+ -) Eγ < 2.2 GeV cosCM(K0) < -0.35

very preliminary

Mass = 1523 +/- 5 MeVFWHM ~ 9 MeV

Mass = 1573 +/- 5 MeVFWHM ~ 9 MeV

γp K+ + - (n)

cos CMK0

<- 0.35

N (1523) ~ 160

N (1573) ~ 300

simulatio

n

JLab–G11 run

X(2000) and (3170)Pentaquarks

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• pN X(2000)N0K+ N @ 70 GeV

• uudss pentaquark? SPHINX @ ITEP

• K-p (3170)- KK- @6.5, 8.25 GeV

• uusss pentaquark? CERN and Argone BC

K-p--(1860)K++

@ 2.87 GeV/c BNL-HBC

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• Complete kinematics, pK > 2.63 GeV/c• K-p-(1820)K+-+-K+

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Hyperon Resonances

Low Energy Hyperon Beam S=-3 Hypernuclei Hyperon Resonances 6 GeV/c K beam for 2.5 GeV/c2 Y* Production

3 x 3 x 3 = 10 + 8 + 8a + 1

=

(# of N* = 14)

J-PARCPentaquark

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Beam Intensity

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Requirements

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High-p BeamlinePentaquark

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Spectrometer Pentaquark

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0 1 2 3 4 5 6 7 8 9 10

p

P (GeV)

e

k

TOFCERENKOV

TOF CERENKOV

CERENKOV

CALORIMETER

HARP @ CERN-PS Pentaquark

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PentaquarkN

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Korea Beamline @ J-PARC

11

22

33

44

2005

2006?

K 1.1/0.8 Beamline or High-p Beamline

2-year Design + 3-year Construction

$ 15M (½ Beamline + ½ Experiment)½ Cost for the Construction

Korea

3~4 Exp Proposals + Beamline Proposal

2006.3