Strangeness photoproduction with the SAPHIR detector

Barth, J.; Bockhorst, M.; Braun, Wolfgang; Burgwinkel, R.; Glander, K. H.; Goers, S.; Hannappel, J.; Jöpen, N.; Kirch, U.; Klein, François; Klein, F. J.; Menze, D.; Neuerburg, W.; Paul, E.; Schwille, W. J.; Tran, M. Q.; Wedemeyer, R.; Wehnes, F.; Wiegers, B.; Wieland, F. W.; Wißkirchen, J.; Ernst, J. A.; Jüngst, H.; Kalinowsky, H.; Klempt, E.; Link, J. T.; Pee, H. van; Plötzke, R.; Schumacher, M.; Smend, F.; Mart, T.; Bennhold, C.

doi:10.1063/1.54376

Cited by 14 publications

(24 citation statements)

References 6 publications

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“…The discovery of the strange baryon Θ + at 1540 MeV [1][2][3][4][5][6][7][8][9][10][11] opened a new chapter in hadron spectroscopy. If confirmed by high statistics experiments, it will challenge the commonly used naive quark model that worked so well for almost four decades.…”

Section: Introductionmentioning

confidence: 99%

SU(3) constraints on cryptoexotic pentaquarks

Praszałowicz

2004

Ann. Phys.

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We examine SU(3) constraints on the spectrum and decay widths of cryptoexotic nucleon-like states in antidecuplet of pentaquarks. We show that in the ideal mixing scenario the number of free matrix elements describing splittings reduces from 4 to 2. Model-independent sum rules are derived. Using as input $\Theta^+$ and $\Xi_{3/2}$ masses we show that it is difficult to interpret Roper and $N^{\ast}(1710)$ nucleon resonances as cryptoexotic pentaquarks. Large $N_c$ limit for antidecuplet and accompanying octet in the diqaurk picture and the analogy with the soliton model is also discussed.Comment: 9 pages, 5 figures, contribution to Festschrift for Klaus Goeke's 60th birthday, to be published in Nov./Dec. 2004 issue of Annalen der Physi

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Section: Introductionmentioning

confidence: 99%

SU(3) constraints on cryptoexotic pentaquarks

Praszałowicz

2004

Ann. Phys.

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“…The simultaneous discovery of a resonance with similar mass and width decaying into a Ξ − π + provides evidence for a I = 3/2 iso-quadruplet. This completes a missing link of the anti-decuplet [4,5,6] which includes the recently discovered Θ + (1540) [7,8,9,10,11]. Moreover pentaquark structures have been observed in the lattice both with parity + and with parity - [12,13,14].…”

Section: Introductionmentioning

confidence: 57%

Antidecuplet candidateΞ--(1862)as a heptaquark with the overlap of two antikaons and a nucleon

Bicudo¹

2004

Phys. Rev. D

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I study the very recently discovered S=-2 resonance Ξ −− (1886) by the NA49 collaboration at the CERN SPS. This resonance was already predicted, with a mass close to 1.9 GeV, in a recent publication mostly dedicated to the S=1 resonance Θ + (1540). To confirm this recent prediction, I apply the same standard quark model with a quark-antiquark annihilation constrained by chiral symmetry. This method also explained with success the repulsive hard core of nucleon-nucleon, kaon-nucleon exotic scattering, and the short range attraction present in pion-nucleon and pionpion non-exotic scattering. I find that repulsion excludes the Ξ −− as a ddssū s-wave pentaquark. I explore the Ξ −− as a heptaquark, equivalent to a N + K + K linear molecule, with positive parity and total isospin I = 3/2. I find that the kaon-kaon repulsion is cancelled by the attraction existing in the kaon-nucleon channels. In our framework this state is easier to bind than the Θ + described by a π + K + N borromean bound-state. The remaining I = 1/2 doublet and I = 1 triplet of the exotic anti-decuplet are also studied, and the coupling to p-wave decay channels is briefly addressed.

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“…The pentaquarks have been revived recently by several searches of the Θ + (1540) 3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20 , first discovered at LEPS 3 , and by searches of the Ξ −− (1860) 21,22,23 and of the D * − p(3100) 24 , observed respectively at NA49 21 and at H1 24 . Pentaquark structures have also been studied on the lattice 25,26,27,28,29,30,31,32 .…”

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confidence: 99%

Exotic Pentaquarks, Crypto-Heptaquarks and Linear Three-Hadronic Molecules

Bicudo¹

2005

Pentaquark 04

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In this talk, multiquarks are studied microscopically in a standard quark model. In pure ground-state pentaquarks the short-range interaction is computed and it is shown to be repulsive, a narrow pentaquark cannot be in the groundstate. As a possible excitation, an additional quark-antiquark pair is then considered, and this is suggested to produce linear molecular system, with a narrow decay width. This excitation may be energetically favourable to the p-wave excitation suggested by the other pentaquark models. Here, the quarks assemble in three hadronic clusters, and the central hadron provides stability. The possible crypto-heptaquark hadrons with exotic pentaquark flavours are studied.Exotic multiquarks are expected since the early works of Jaffe 1 , and the masses and decays in the SU(3) exotic anti-decuplet were first predicted within the chiral soliton model 2 .The pentaquarks have been revived recently by several searches of the Θ + (discovered at LEPS 3 , and by searches of the Ξ −− (1860) 21,22,23 and of the D * − p(3100) 24 , observed respectively at NA49 21 and at H1 24 . Pentaquark structures have also been studied on the lattice 25,26,27,28,29,30,31,32 . Moreover multiquarks are favoured by the presence of several different flavours 33,34,35 . The observation of the D * − p(3100) at H1, the observation of double-charmed baryons at SELEX 36 , and the future search of double-charmed baryons at COMPASS 37 suggest that new pentaquarks with heavy quarks may be discovered.In this talk it is shown that the pentaquarks cannot be in the groundstate. The lowest excitation consists in including a light quark-antiquark pair in the system. This results in a heptaquark and in a linear molecular system. The possible crypto-heptaquark hadrons with exotic pentaquark

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Strangeness photoproduction with the SAPHIR detector

Cited by 14 publications

References 6 publications

SU(3) constraints on cryptoexotic pentaquarks

SU(3) constraints on cryptoexotic pentaquarks

Antidecuplet candidateΞ--(1862)as a heptaquark with the overlap of two antikaons and a nucleon

Exotic Pentaquarks, Crypto-Heptaquarks and Linear Three-Hadronic Molecules

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