hyun-chul kim department of physics inha university in collaboration with h.y. ryu, a. hosaka, a....
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Hyun-Chul Kim
Department of Physics Inha University
In collaboration with H.Y. Ryu, A. Hosaka, A. Titov
EFB 22, Sept. 10, 2013@Kraków
meson photoproduction with hadron rescattering
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Motivation
OZI rule violation- Gluonic dynamics (Pomeron)- Hidden strangeness• Usual vector-meson exchanges are forbidden by the charge conjugation.• Hybrid exotic vector mesons (C=+1) are allowed but not much data.
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Motivation
텍스트
This bump structure cannot be explained by the pomeron and one meson-exchange picture!
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Motivation
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Motivation
• How to explain the bump structure around the K Lambda(1520) threshold.
• How to describe the production mechanism near the threshold in place of the pomeron.
In the present talk, we propose possible coupled-channel effects that may explain the phi photoproduction mechanism near the threshold region.
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Summary of previous works
Titov et al. PRC 60, 035205 (1999): Structure of the phi photoproduction
• Ordinary vector-meson exchange is forbidden.
• The pomeron governs the energy dependence of the differential cross section, though it is theoretically plausible only at higher energies.
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Summary of previous works
• Mibe et al. PRL, 95, 182001 (2005): phi diffractive photoproduction near the threshold
• Ozaki et al. PRC 80, 035201 (2009): K-matrix method (Coupled-channel)
• Chang et al. PRC 82, 015205 (2010): Measurement of the spin-density matrices
• Kiswandhi et al. PLB 691, 214 (2010): Possible N*(2080) resonance with large strangeness
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Effective Lagrangian methods
Describe hadron processes in terms of effective degrees of freedom: Quark-gluon dynamics are encoded in the coupling constants and form factors.
S.i. Nam, A. Hosaka, HChK, Phys. Rev. D 71, 114012 (2005) S.i. Nam, K.S. Choi, A. Hosaka, HChK, D 75, 014027 (2005)
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Effective Lagrangian methodsInvariant amplitude
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Production Mechanism
A. Titov et al. PRC 60, 035205 (1999)Conventional approach
Pomeron
t-channel hadron exchange
Present approach
Rescattering amplitudes
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Rescattering equation
Hadronic part
Blankenbecler-Sugar type scattering equation
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Rescattering equation
Rescattering part in a coupled-channel formalism
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Rescattering equation
Rescattering part in a coupled-channel formalism
In this work, we will consider only the imaginary part for simplicity,
to see the reliability of the present method. The full computation is under way.
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Rescattering amplitudes
Most important term
=
+
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Numerical results
HadronsHadrons + Pomeron
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Differential Cross Sections
No Pomeron contribution (E = 2 GeV). Hadronic process can explain the angular distribution.
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Differential cross sections
• Mibe et al. PRL, 95, 182001 (2005)
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Spin-density matrices
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Spin-density matrices
In general, spin-density matrices near the threshold region are well described.
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Decay angular distributions
C.M. system
Gottfried-Jackson system
Definition of angles
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Decay angular distributions
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Decay angular distributionsT. Mibe et al. [LEPS
Collaboration], PRL 95, 182001 (2005)
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23
Summary and Outlook
• We investigated phi photoproduction, emphasizing the significance of the rescattering contributions, in particular, the K Lambda(1520) channel.
• The K Lambda (1520) plays a dominant role.
• However, we have considered here only the imaginary part of the rescattering amplitudes, to see their importance.
• The real part of the rescattering amplitudes are under investigation, and it seems even more important. The corresponding work will soon appear.
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Thank you very much!
Though this be madness,yet there is method in it.
Hamlet Act 2, Scene 2