Photoproduction of Θ baryon from the neutron

Nam, Seung-il; Kim, Hyun-Chul

doi:10.1016/j.physletb.2003.10.105

Cited by 56 publications

(67 citation statements)

References 16 publications

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“…The experimental observation of the Θ + performed by the LEPS collaboration at SPring-8 [1], which is motivated by Diakonov et al [2], have paved the way for intensive studies on the exotic five-quark baryon states, also known as pentaquarks, experimentally [3] as well as theoretically [2,4,5,6,7,8,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30]. As a consequence of the finding of the Θ + , the existence of other pentaquark baryons such as the N 5 , Σ 5 and Ξ 5 , which have been also predicted theoretically, has been anticipated.…”

Section: Introductionmentioning

confidence: 99%

“…For example, the chiral soliton model [2,4], the diquark model [5], the chiral potential model [6], and constituent quark models with spin-flavor interactions [10,11,12] prefer the positive-parity for the Θ + , whereas the QCD sum rule approach [7,8] 1 and the quenched lattice QCD [13,14] have supported the negative-parity. In the meanwhile, various reactions for the Θ + production [15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30] has been investigated, where the determination of the parity of Θ + has been emphasized. In many cases, the total cross sections of the positive-parity Θ + production is typically about ten times larger than those of the negative-parity one.…”

Section: Introductionmentioning

confidence: 99%

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Production of the Pentaquark Exotic Baryon $Xi_5$ in $bar{K}N$ Scattering: $bar{K}N o KXi_5$ and $bar{K}N o K^{*}Xi_5$

Nam¹,

Kim²

2008

J. Korean Phy. Soc.

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We investigate the production of the newly found pentaquark exotic baryon Ξ 5 in the KN → KΞ 5 and KN → K * Ξ 5 reactions at the tree level. We consider the both positive-and negativeparities of the Ξ 5 . The reactions are dominated by the s-and u-channel processes, and it is observed that the resulting cross sections are very much dependent on the parity of Ξ 5 and on the type of form factor. We have seen that the cross sections for the positive-parity Ξ 5 are generally about a hundred times larger than those of the negative-parity one. This large difference in the cross sections would be useful for the further study of the pentaquark baryons.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Production of the Pentaquark Exotic Baryon $Xi_5$ in $bar{K}N$ Scattering: $bar{K}N o KXi_5$ and $bar{K}N o K^{*}Xi_5$

Nam¹,

Kim²

2008

J. Korean Phy. Soc.

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“…The general assumption subsumed in Refs. [18,19,20,21,22,23,24,25,26] is that for γn → K − Θ + , four transition amplitudes labelled by the Mandelstam variables contribute in the Born approximation limit. These are shown by diagrams in Fig.…”

mentioning

confidence: 99%

“…The differing output of the calculations in Refs. [18,19,20,21,22,23,24,25,26] for magnitudes and energy dependences are due to their various assumptions on the magnitudes of, e.g., g ΘN K , g ΘN K * , the role of the contact term and importance of s : u channels. However, some qualitative features can be immediately understood, which are sufficient for the generalisations in this present paper.…”

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confidence: 99%

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Photoproduction of Θ+ and other pentaquark states

Zhao

2004

Physics Letters B

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We present constraints on the relative photoproduction cross sections of positive parity pentaquark states, Σ5, Λ5, and N5, based on a minimum phenomenology gained in γN → KΘ + and their baryon-meson couplings as in the work of Close and Dudek. The possibility of anomalous signals in γp → K 0 S (Θ + ; Σ + d ) is discussed. We emphasise the importance of comparing γN → KΘ + with "conventional" states such as

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Structure and reactions of pentaquark baryons

Hosaka

2006

Pramana - J Phys

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We review the current status of the exotic pentaquark baryons. After a brief look at experiments of both positive and negative results, we discuss theoretical methods to study the structure and reactions for the pentaquarks. First we introduce the quark model and the chiral soliton model, where we discuss the relation of mass spectrum and parity with some emphasis on the role of chiral symmetry. It is always useful to picture the structure of the pentaquarks in terms of quarks. As for other methods, we discuss a model independent method, and briefly mention the results from the lattice and QCD sum rule. Decay properties are then studied in some detail, which is one of the important properties of Θ + . We investigate the relation between the decay width and the quark structure having certain spin-parity quantum numbers. Through these analyses, we consider as plausible quantum numbers of Θ + , J P = 3/2 − . In the last part of this note, we discuss production reactions of Θ + which provide links between the theoretical models and experimental information. We discuss photoproductions and hadron-induced reactions which are useful to explore the nature of Θ + .

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Photoproduction of Θ baryon from the neutron

Cited by 56 publications

References 16 publications

Production of the Pentaquark Exotic Baryon $Xi_5$ in $bar{K}N$ Scattering: $bar{K}N o KXi_5$ and $bar{K}N o K^{*}Xi_5$

Production of the Pentaquark Exotic Baryon $Xi_5$ in $bar{K}N$ Scattering: $bar{K}N o KXi_5$ and $bar{K}N o K^{*}Xi_5$

Photoproduction of Θ+ and other pentaquark states

Structure and reactions of pentaquark baryons

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