Spin asymmetries in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi>γ</mml:mi><mml:mi>N</mml:mi><mml:mo>→</mml:mo><mml:msup><mml:mover accent="true"><mml:mi>K</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mo>*</mml:mo></mml:msup><mml:msup><mml:mi>Θ</mml:mi><mml:mo>+</mml:mo></mml:msup></mml:math>

Oh, Yongseok; Kim, Hungchong; Lee, Su Houng

doi:10.1016/j.nuclphysa.2004.09.010

Cited by 11 publications

(3 citation statements)

References 74 publications

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“…As in Ref. [149], we use g K * N Θ /g KN Θ = √ 3 for even parity Θ and g K * N Θ /g KN Θ = 1/ √ 3 for odd parity Θ following the quark model predictions [123,129,159] while neglecting the tensor coupling terms. The dependence of our results on this ratio will be discussed later.…”

Section: E Pentaquark Contributionmentioning

confidence: 99%

“…Furthermore, understanding the Θ + properties such as spin-parity requires careful analyses of production mechanisms 4 including γN →KΘ [143][144][145][146][147][148], γN →K * Θ [149], [138,139,142,157], and 4 See, however, Refs. [136][137][138][139][140][141][142], where efforts to determine these properties, in particular the parity of the Θ + , in a model-independent way in photo-and hadro-production reactions have been reported.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, understanding the Θ + properties such as spin-parity requires careful analyses of production mechanisms 4 including γN → KΘ [143][144][145][146][147][148], γN → K * Θ [149], [138,139,142,157], and KN → KπN [158]. Most model predictions for those production processes, however, do not consider the intermediate pentaquark baryons in its production mechanisms as the unknown inputs like the electromagnetic and strong couplings of pentaquark baryons are required.…”

Section: Introductionmentioning

confidence: 99%

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Pentaquark Θ+(1540) production in γN→KK¯N reactions

Nakayama

Lee

2006

Physics Reports

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The recent developments in the search of exotic pentaquark hadrons are briefly reviewed. We then focus on investigating how the exotic pentaquark Θ(1540) baryon production can be identified in the γN → KKN reactions, focusing on the influence of the background (non-Θ production) mechanisms. By imposing the SU(3) symmetry and using various quark model predictions, we are able to fix the coupling constants for evaluating the kaon backgrounds, the KK production through the intermediate vector meson and tensor meson photoproduction, and the mechanisms involving intermediate Λ (1116), Λ(1405), Λ(1520), Σ(1193), Σ(1385), and ∆(1232) states. The vector meson photoproduction part is calculated from a phenomenological model which describes well the experimental data at low energies. We point out that the neutral tensor meson production can not be due to π 0 -exchange as done by Dzierba et al. [Phys. Rev. D 69, 051901 (2004)] because of C parity. The neutral tensor meson production is estimated by considering the vector meson exchange and found to be too weak to generate any peak at the position near Θ(1540). For Θ(1540) production, we assume that it is an isoscalar and hence can only be produced in γn → K + K − n and γp → K 0 K 0 p reactions, but not in γp → K + K − p and γn → K 0 K 0 n. The total cross section data of γp → K + K − p is thus used to fix the form factors which regularize the background amplitudes so that the signal of Θ(1540) in γn → K + K − n and γp → K 0 K 0 p cross sections can be predicted.We find that the predicted K + K − and K + n invariant mass distributions of the γn → K + K − n reaction can qualitatively reproduce the shapes of the JLab data. However, the predicted Θ(1540) peak can not be identified unambiguously with the data. High statistics experiments are needed to resolve the problem. We also find that an even-parity Θ is more likely to be detected, while it will be difficult to identify an odd-parity Θ, even if it exists, from the background continuum, if its coupling constants are small as in the present quark model predictions.

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Section: E Pentaquark Contributionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Furthermore, understanding the Θ + properties such as spin-parity requires careful analyses of production mechanisms 4 including γN → KΘ [143][144][145][146][147][148], γN → K * Θ [149], [138,139,142,157], and KN → KπN [158]. Most model predictions for those production processes, however, do not consider the intermediate pentaquark baryons in its production mechanisms as the unknown inputs like the electromagnetic and strong couplings of pentaquark baryons are required.…”

Section: Introductionmentioning

confidence: 99%

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Pentaquark Θ+(1540) production in γN→KK¯N reactions

Nakayama

Lee

2006

Physics Reports

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Parity of Θ+(1540) from QCD sum rules

Lee¹,

Kim²,

Kwon³

2005

Physics Letters B

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The QCD sum rule for the pentaquark Θ + , first analyzed by Sugiyama, Doi and Oka, is reanalyzed with a phenomenological side that explicitly includes the contribution from the two-particle reducible kaon-nucleon intermediate state. The magnitude for the overlap of the Θ + interpolating current with the kaon-nucleon state is obtained by using soft-kaon theorem and a separate sum rule for the ground state nucleon with the pentaquark nucleon interpolating current. It is found that the K-N intermediate state constitutes only 10% of the sum rule so that the original claim that the parity of Θ + is negative remains valid.

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Some aspects ofΘ+parity determination in the reactionγN→Θ+<

Титов¹,

Ejiri

Haberzettl

et al. 2005

Phys. Rev. C

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We analyze the problem of how to determine the parity of the Θ + pentaquark in the reaction γN → KΘ → N KK, where N = n, p. Our model calculations indicate that the contribution of the non-resonant background of the reaction γN → N KK cannot be neglected, and that suggestions to determine the parity based solely on the initial-stage process γN → KΘ cannot be implemented cleanly. We discuss the various mechanisms that contribute to the background, and we identify some spin observables which are sensitive mostly to the Θ + parity rather than to the details of the production mechanism.

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Spin asymmetries in γN→K¯*Θ+

Cited by 11 publications

References 74 publications

Pentaquark Θ+(1540) production in γN→KK¯N reactions

Pentaquark Θ+(1540) production in γN→KK¯N reactions

Parity of Θ+(1540) from QCD sum rules

Some aspects ofΘ+parity determination in the reactionγN→Θ+<

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