Exotic hadrons made of five quarks (pentaquarks) are searched for in hadronic Z decays collected by the ALEPH detector at LEP. No significant signal is observed. At 95% C.L., upper limits are set on the production rates N of such particles and their charge-conjugate state per Z decay: NΞ(1862)−−⋅BR(Ξ(1862)−−→Ξ−π−)<4.5×10−4, NΞ0(1862)⋅BR(Ξ0(1862)→Ξ−π+)<8.9×10−4, NΘc0(3100)⋅BR(Θc0(3100)→D*−p)<6.3×10−4, NΘc0(3100)⋅BR(Θc0(3100)→D−p)<31×10−4.
Autori interni: | |
Autori: | ALEPH Collaboration (S. Schael (Aachen; Tech. Hochsch.); R. Barate; R. Bruneliere; I. De Bonis; D. Decamp; C. Goy; S. Jezequel; J.P. Lees; F. Martin; E. Merle; M.N. Minard; B. Pietrzyk; B. Trocme (Annecy; LAPP); S. Bravo; M.P. Casado; M. Chmeissani; J.M. Crespo; E. Fernandez; M. Fernandez-Bosman; L. Garrido; M. Martinez; A. Pacheco; H. Ruiz (Barcelona; Autonoma U.); A. Colaleo; D. Creanza; N. De Filippis; M. De Palma; G. Iaselli; G. Maggi; M. Maggi; S. Nuzzo; A. Ranieri; G. Raso; F. Ruggieri; G. Selvaggi; L. Silvestris; P. Tempesta; A. Tricomi; G. Zito (INFN; Bari & Catania U. & INFN; Catania); X. Huang; J. Lin; Q. Ouyang; T. Wang; Y. Xie; R. Xu; S. Xue; J. Zhang; L. Zhang; W. Zhao (Beijing; Inst. High Energy Phys.); D. Abbaneo; T. Barklow; O. Buchmuller; M. Cattaneo; B. Clerbaux; H. Drevermann; R.W. Forty; M. Frank; F. Gianotti; J.B. Hansen; J. Harvey; D.E. Hutchcroft; P. Janot; B. Jost; M. Kado; P. Mato; A. Moutoussi; F. Ranjard; Gigi Rolandi; D. Schlatter; G. Sguazzoni; F. Teubert; A. Valassi; I. Videau (CERN); F. Badaud; S. Dessagne; A. Falvard; D. Fayolle; P. Gay; J. Jousset; B. Michel; S. Monteil; D. Pallin; J.M. Pascolo; P. Perret (Clermont-Ferrand U.); J.D. Hansen; J.R. Hansen; P.H. Hansen; A.C. Kraan; B.S. Nilsson (Copenhagen U.); A. Kyriakis; C. Markou; E. Simopoulou; A. Vayaki; K. Zachariadou (Democritos Nucl. Res. Ctr.); A. Blondel; J.C. Brient; F. Machefert; A. Rouge; H. Videau (Ecole Polytechnique); V. Ciulli; E. Focardi; G. Parrini (Florence U. & INFN; Florence); A. Antonelli; M. Antonelli; G. Bencivenni; F. Bossi; G. Capon; F. Cerutti; V. Chiarella; P. Laurelli; G. Mannocchi; G.P. Murtas; L. Passalacqua (Frascati & IFSI; Turin); J. Kennedy; J.G. Lynch; P. Negus; V. O'Shea; A.S. Thompson (Glasgow U.); S. Wasserbaech (Utah Valley U.); R. Cavanaugh; S. Dhamotharan; C. Geweniger; P. Hanke; V. Hepp; E.E. Kluge; A. Putzer; H. Stenzel; K. Tittel; M. Wunsch (Heidelberg U.); R. Beuselinck; W. Cameron; G. Davies; P.J. Dornan; M. Girone; N. Marinelli; J. Nowell; S.A. Rutherford; J.K. Sedgbeer; J.C. Thompson; R. White (Imperial Coll.; London); V.M. Ghete; P. Girtler; E. Kneringer; D. Kuhn; G. Rudolph (Innsbruck U.); E. Bouhova-Thacker; C.K. Bowdery; D.P. Clarke; G. Ellis; A.J. Finch; F. Foster; G. Hughes; R.W.L. Jones; M.R. Pearson; N.A. Robertson; M. Smizanska (Lancaster U.); O. van der Aa; C. Delaere; G. Leibenguth; V. Lemaitre (Louvain U.); U. Blumenschein; F. Holldorfer; K. Jakobs; F. Kayser; K. Kleinknecht; A.S. Muller; B. Renk; H.G. Sander; S. Schmeling; H. Wachsmuth; C. Zeitnitz; T. Ziegler (Mainz U.; Inst. Phys.); A. Bonissent; P. Coyle; C. Curtil; A. Ealet; D. Fouchez; P. Payre; A. Tilquin (Marseille; CPPM); F. Ragusa (Milan U. & INFN; Milan); A. David; H. Dietl; G. Ganis; K. Huttmann; G. Lutjens; W. Manner; H.G. Moser; R. Settles; M. Villegas; G. Wolf (Munich; Max Planck Inst.); J. Boucrot; O. Callot; M. Davier; L. Duflot; J.F. Grivaz; P. Heusse; A. Jacholkowska; L. Serin; J.J. Veillet (Orsay; LAL & Montpellier U.); P. Azzurri; Giuseppe Bagliesi; T. Boccali; L. Foa; A. Giammanco; A. Giassi; F. Ligabue; Messineo A; F. Palla; G. Sanguinetti; A. Sciaba; P. Spagnolo; R. Tenchini; A. Venturi; P.G. Verdini (Pisa U. & INFN; Pisa & Pisa; Scuola Normale Superiore); O. Awunor; G.A. Blair; G. Cowan; A. Garcia-Bellido; M.G. Green; T. Medcalf; A. Misiejuk; J.A. Strong; P. Teixeira-Dias (Royal Holloway; U. of London); R.W. Clifft; T.R. Edgecock; P.R. Norton; I.R. Tomalin; J.J. Ward (Rutherford); Brigitte Bloch-Devaux; D. Boumediene; P. Colas; B. Fabbro; E. Lancon; M.C. Lemaire; E. Locci; P. Perez; J. Rander; B. Tuchming; B. Vallage (Saclay); A.M. Litke; G. Taylor (UC; Santa Cruz); C.N. Booth; S. Cartwright; F. Combley; P.N. Hodgson; M. Lehto; L.F. Thompson (Sheffield U.); A. Bohrer; S. Brandt; C. Grupen; J. Hess; A. Ngac; G. Prange (Siegen U.); C. Borean; G. Giannini (Trieste U. & INFN; Trieste); H. He; J. Putz; J. Rothberg (Washington U.; Seattle); S.R. Armstrong; Karl Berkelman; K. Cranmer; D.P.S. Ferguson; Y. Gao; S. Gonzalez; O.J. Hayes; H. Hu; S. Jin; J. Kile; P.A. McNamara; J. Nielsen; Y.B. Pan; J.H. von Wimmersperg-Toeller; W. Wiedenmann; J. Wu; S.L. Wu; X. Wu; G. Zobernig (Wisconsin U.; Madison & Tsinghua U.; Beijing); G. Dissertori (Zurich; ETH)) |
Titolo: | Search for pentaquark states in Z decays. |
Anno del prodotto: | 2004 |
Abstract: | Exotic hadrons made of five quarks (pentaquarks) are searched for in hadronic Z decays collected by the ALEPH detector at LEP. No significant signal is observed. At 95% C.L., upper limits are set on the production rates N of such particles and their charge-conjugate state per Z decay: NΞ(1862)−−⋅BR(Ξ(1862)−−→Ξ−π−)<4.5×10−4, NΞ0(1862)⋅BR(Ξ0(1862)→Ξ−π+)<8.9×10−4, NΘc0(3100)⋅BR(Θc0(3100)→D*−p)<6.3×10−4, NΘc0(3100)⋅BR(Θc0(3100)→D−p)<31×10−4. |
Digital Object Identifier (DOI): | 10.1016/j.physletb.2004.08.021 |
Appare nelle tipologie: | 1.1 Articolo in rivista |
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