Workshop on LEPS/SPring-8 new beamline, 28~29 July 2005, RCNP, Japan + + photoproduction with vector photoproduction with vector K* K* (including other recent results) Seung-il Nam *1,2 Atsushi Hosaka 1 Hyun-Chul Kim 2 1.Research Center for Nuclear Physics (RCNP), Osaka Univ., Japan RCNP & NuR I
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Workshop on LEPS/SPring-8 new beamline, 28~29 July 2005, RCNP, Japan + photoproduction with vector K* (including other recent results) Seung-il Nam *1,2.
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Wor
ksho
p on
LEP
S/SP
ring-
8 ne
w b
eam
line,
28~
29 J
uly
2005
, RCN
P, J
apan
++ photoproduction with vector K* photoproduction with vector K*(including other recent results)
Seung-il Nam*1,2 Atsushi Hosaka1 Hyun-Chul Kim2
1.Research Center for Nuclear Physics (RCNP), Osaka Univ., Japan2.Nuclear physics & Radiation technology Institute (NuRI), Pusan Univ., Korea
RCNP & NuRI
Recent status of Theta
Wor
ksho
p on
LEP
S/SP
ring-
8 ne
w b
eam
line,
28~
29 J
uly
2005
, RCN
P, J
apan
RCNP & NuRI
Recent experiments for pentaquark baryonsRecent experiments for pentaquark baryons
New evidence for New evidence for ++ by LEPS at Spring-8 by LEPS at Spring-8
(1520) (=(1520) (=*) photoproduction revisited experimentally by LEPS*) photoproduction revisited experimentally by LEPS
++ ++ announced by STAR announced by STAR
No clear evidence for No clear evidence for ++ CLAS at JLAB CLAS at JLAB
Negative results from BABAR etcNegative results from BABAR etc
Considering photoproduction of Considering photoproduction of ++, (LEPS and CLAS), (LEPS and CLAS)
Positive results out of neutron target vs. Negative results out of proton targetPositive results out of neutron target vs. Negative results out of proton target
Suppression of total cross section for proton? Suppression of total cross section for proton?
What is the suppression mechanism?What is the suppression mechanism?
Huang, talk given at Beijing (2005)Huang, talk given at Beijing (2005)
R.De Vita, talk given at APS (2005)R.De Vita, talk given at APS (2005)
talk given at Nara (2005)talk given at Nara (2005)T.Nakano, talk given at Beijing (2005)T.Nakano, talk given at Beijing (2005)
The Born approximation at tree levelThe Born approximation at tree level
Phenomenological form factor maintaining the Ward-Takahashi identityPhenomenological form factor maintaining the Ward-Takahashi identity
Parameters estimated by phenomenological consideration and model calculationParameters estimated by phenomenological consideration and model calculation
Experimental data used for fixing cutoff Experimental data used for fixing cutoff
S.I.N et al.,Phys.Rev.D71,114012S.I.N et al.,Phys.Rev.D71,114012
S.I.N et al.,hep-ph/0505134, S.I.N et al.,hep-ph/0505134, submitted to Phys.Lett.Bsubmitted to Phys.Lett.B
S.I.N et al.,in preparationS.I.N et al.,in preparation
Photoproduction of Lambda*
Wor
ksho
p on
LEP
S/SP
ring-
8 ne
w b
eam
line,
28~
29 J
uly
2005
, RCN
P, J
apan
RCNP & NuRI
Strong correlation between Strong correlation between and and (1520)(1520)
New evidence of New evidence of + + by LEPS at Spring-8 using deuteron target by LEPS at Spring-8 using deuteron target
Simultaneous productions of Simultaneous productions of ++ and and * *
KK--
DD
++
pp
**
DD
++
<< 1<< 1
(1520) invariant mass K-p missing mass for
Photoproduction of Lambda*
++ photoproduction from deuteron target by LEPS photoproduction from deuteron target by LEPS
Only for Only for * resonant region, peak for * resonant region, peak for appears appears
Motivation: Is it possible for extracting information for Motivation: Is it possible for extracting information for via via *?*?
** KK--
DD++
pp
Wor
ksho
p on
LEP
S/SP
ring-
8 ne
w b
eam
line,
28~
29 J
uly
2005
, RCN
P, J
apan
RCNP & NuRI
Photoproduction of Lambda(1520)
Photoproduction of Photoproduction of (1520)(1520)
K*K*-dominance scenario proposed by experiments-dominance scenario proposed by experiments
In the experimental analysis, almost In the experimental analysis, almost (1520) decayed from its |S(1520) decayed from its |Szz|=3/2 state|=3/2 state
From this fact, From this fact, K*K*-exchange was believed as dominant contribution (-exchange was believed as dominant contribution (tt-channel)-channel)
Theoretical proof: Is this conclusion is correct?Theoretical proof: Is this conclusion is correct?
Natural consequences for Natural consequences for K K and and K*K*
Large |SLarge |Szz|=3/2|=3/2 contribution from the contact term not from contribution from the contact term not from K*K*