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BY-NC-ND 3.0 license Open Access Published by De Gruyter Open Access December 1, 2005

Spectrum of the Y=2 pentaquarks

Franco Buccella, Domenico Falcone and Francesco Tramontano
From the journal Open Physics


Based on an assumed mass formula for the spectrum of the Y=2 pentaquarks, where the chromo-magnetic interaction plays an important role, and identifying the lightest state with the Θ+(1540), we predict a spectrum in good agreement with the few I=0 and I=1 candidates proposed in the past.

Keywords: 12.39.Ki; 12.40.Yx

[1] Photon Nucleus T. Nakano et al. (LEPS Collaboration): “Observation of S=+1 baryon resonance in photo-production from neutron”, Phys. Rev. Lett., Vol. 91, (2003), pp. 012002. in Google Scholar PubMed

[2] Kaon Nucleus V.V. Barmin et al. (DIANA Collaboration): “Observation of a baryon resonance with positive strangeness in K+ collisions with Xe nuclei”, Phys. Atom. Nucl., Vol. 66, (2003), pp. 1715–1718;Yad. Fiz., Vol. 66, (2003), 1763. in Google Scholar

[3] Photon Deuteron S. Stepanyan et al. (CLAS Collaboration): “Observation of an exotic S=+1 baryon in exclusive photoproduction from the deuteron”, Phys. Rev. Lett., Vol. 91, (2003), pp. 252001. in Google Scholar PubMed

[4] Photon Proton J. Barth et al. (SAPHIR Collaboration): “Observation of the positive-strangeness pentaquark Theta+ in photoproduction with the SAPHIR detector at ELSA”, Phys. Lett. B, Vol. 572, (2003), pp. 127–132; in Google Scholar

[5] V. Kubarovsky and S. Stepanyan (CLAS Collaboration): “Evidence for an exotic baryon state, Theta (1540)+, in photoproduction reactions from protons and deuterons with CLAS”, AIP Conf. Proc., Vol. 698, (2004), pp. 543–547. Search in Google Scholar

[6] Neutrino (D+Ne) A.E. Asratyan, A.G. Dolgolenko and M.A. Kubantsev: “Evidence for formation of a narrow K0(S) p resonance with mass near 1533-MeV in neutrino interactions”, Phys. Atom. Nucl., Vol. 67, (2004), pp. 682–687;Yad. Fiz., Vol. 67, (2004), pp. 704–709; A. Airapetian et al. (HERMES Collaboration): “Evidence for a narrow |S|=1 baryon state at a mass of 1528-MeV in quasi-real photoproduction”, Phys. Lett. B, Vol. 585, (2004), pp. 213–222. in Google Scholar

[7] D. Diakonov, V. Petrov and M.V. Polyakov: “Exotic anti-decuplet of baryons: Prediction from chiral solitons”, Z. Phys. A, Vol. 359, (1997), pp. 305–314; H. Weigel: “Radial excitations of low-lying baryons and the Z+ penta-quark”, Eur. Phys. J. A., Vol. 2, (1998), pp. 391–402. in Google Scholar

[8] T.H.R. Skyrme: “A Unified Field Theory Of Mesons And Baryons”, Nucl. Phys., Vol. 31, (1962), pp. 556–569; E. Witten: “Current Algebra, Baryons, And Quark Confinement”, Nucl. Phys. B, Vol. 223, (1983), pp. 433–444; G.S. Adkins, C.R. Nappi and E. Witten: “Static Properties Of Nucleons In The Skyrme Model”, Nucl. Phys. B, Vol. 228, (1983), pp. 552–566; E. Guadagnini: “Baryons As Solitons And Mass Formulae”, Nucl. Phys. B, Vol. 236, (1984), pp. 35–47; M. Chemtob: “Skyrme Model Of Baryon Octet And Decuplet”, Nucl. Phys. B, Vol. 256, (1985), pp. 600–608. in Google Scholar

[9] F. Stancu and D.O. Riska: “Stable u u d d anti-s pentaquarks in the constituent quark model”, Phys. Lett. B, Vol. 575, (2003), pp. 242–248. in Google Scholar

[10] R.L. Jaffe and F. Wilczek: “Diquarks and exotic spectroscopy”, Phys. Rev. Lett., Vol. 91, (2003), pp. 232003. in Google Scholar PubMed

[11] B.K. Jennings and K. Maltman: “Z* resonances: Phenomenology and models”, Phys. Rev. D, Vol. 69, (2004), pp. 094020. in Google Scholar

[12] R. Bijker, M.M. Giannini and E. Santopinto: “Spectroscopy of pentaquark states”, Eur. Phys. J. A, Vol. 22, (2004), pp. 319–329. in Google Scholar

[13] C.E. Carlson, C.D. Carone, H.J. Kwee and V. Nazaryan: “Phenomenology of the pentaquark antidecuplet”, Phys. Lett. B, Vol. 573, (2003), pp. 101–108. in Google Scholar

[14] F. Buccella and P. Sorba: “Narrow width pentaquarks”, Mod. Phys. Lett. A, Vol. 19, (2004), pp. 1547–1559. in Google Scholar

[15] J.J. Dudek and F.E. Close: “The J=3/2 Theta* partner to the Theta(1540) baryon”, Phys. Lett. B, Vol 583, (2004), pp. 278–284. in Google Scholar

[16] J.J. Dudek: “A model realisation of the Jaffe-Wilczek correlation for pentaquarks”, arXiv:hep-ph/0403235. Search in Google Scholar

[17] H. Hogaasen, and P. Sorba: “The colour triplet q q anti-q cluster and pentaquark models”, Mod. Phys. Lett. A, Vol. 19, (2004), pp. 2403–2410. in Google Scholar

[18] I.M. Narodetskii, C. Semay, B. Silvestre-Brac and Y.A. Simonov: “Pentaquarks in the string dynamics”, Nucl. Phys. Proc. Suppl., Vol. 142, (2005), pp. 383–387. in Google Scholar

[19] H. Hogaasen and P. Sorba: “The Systematics of Possibly Narrow Quark States With Baryon Number One”, Nucl. Phys. B, Vol. 145, (1978), pp. 119–140; M. de Crombrugghe, H. Hogaasen and P. Sorba: “Quantitative Predictions For 4 Q Anti-Q Baryons”, Nucl. Phys. B, Vol. 156, (1979), pp. 347–364. in Google Scholar

[20] A. de Rujula, H. Georgi and S.L. Glashow: “Hadron Masses In A Gauge Theory”, Phys. Rev. D, Vol. 12, (1975), pp. 147–162. in Google Scholar

[21] R.A. Arndt and L.D. Roper: “K+ Proton Partial Wave Analysis to 3-Gev/C”, Phys. Rev. D, Vol. 31, (1985), pp. 2230–2241. in Google Scholar

[22] M. Roos et al.: “Review Of Particle Properties. Particle Data Group”, Phys. Lett. B, Vol. 111, (1982), pp. 1–294. in Google Scholar

[23] J.S. Hyslop, R.A. Arndt, L.D. Roper and R.L. Workman: “Partial wave analysis of K+ nucleon scattering”, Phys. Rev. D, Vol. 46, (1992), pp. 961–969. in Google Scholar PubMed

[24] F. Gursey and L.A. Radicati: “Spin and unitary spin independence of strong interactions”, Phys. Rev. Lett., Vol. 13, (1964), pp. 173–175. in Google Scholar

[25] F. Buccella: “A selection rule for multiquark decays”, arXiv:hep-ph/0411244. Search in Google Scholar

[26] C.E. Carlson, C.D. Carone, H.J. Kwee and V. Nazaryan: “A naturally narrow positive parity Theta+”, Phys. Rev. D, Vol. 70, (2004), pp. 037501. in Google Scholar

[27] G.C. Rossi and G. Veneziano: “Electromagnetic Mixing Of Narrow Baryonium States”, Phys. Lett. B, Vol. 70, (1977), pp. 255–259; G.C. Rossi and G. Veneziano: “Isospin mixing of narrow pentaquark states”, Phys. Lett. B, Vol. 597, (2004), pp. 338–345. in Google Scholar

[28] R.L. Jaffe: “Q**2 Anti-Q**2 Resonances In The Baryon—Anti-Baryon System”, Phys. Rev. D, Vol. 17, (1978), pp. 1444–1458. in Google Scholar

[29] A. Alosio et al., (KLOE Collaboration): “Study of the decay Phi→pi0 pi0 gamma with the KLOE detector”, Phys. Lett. B, Vol. 537, (2002), pp. 21–27; E.M. Aitala et al. (E791 Collaboration): “Experimental evidence for a light and broad scalar resonance in D+→pi−pi+pi+ decay”, Phys. Rev. Lett., Vol. 86, (2001), pp. 770–774. in Google Scholar

[30] C. Alt et al. (NA49 Collaboration): “Observation of an exotic S=−2, Q=−2, baryon resonance in proton proton collisions at the CERN SPS”, Phys. Rev. Lett., Vol. 92, (2004), pp. 042003. in Google Scholar PubMed

Published Online: 2005-12-1
Published in Print: 2005-12-1

© 2005 Versita Warsaw

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