Search for Pentaquarks Decaying to Xi-pi in Deep Inelastic Scattering at HERA

Chekanov, S.; Derrick, M.; Krakauer, D.; Loizides 1, J. H.; Magill, S.; Musgrave, B.; Repond, J.; Yoshida, R.; Mattingly, M. C. K.; Antonioli, P.; Bari, G.; Basile, Maurizio; Bellagamba, L.; Boscherini, D.; Bruni, A.; Bruni, G.; Cara Romeo, G.; Cifarelli, Luisa; Cindolo, F.; Contin, Andrea; Corradi, M.; De Pasquale, S.; Giusti, P.; Iacobucci, G.; Margotti, A.; Montanari, A.; Nania, R.; Palmonari, Federico; Pesci, A.; Rinaldi, Lorenzo; Sartorelli, Gabriella; Zichichi, Antonino; Aghuzumtsyan, G.; Bartsch, D.; Brock, I.; Goers, S.; Hartmann, H.; Hilger, E.; Irrgang, P.

doi:10.1016/j.physletb.2005.02.016

A search for pentaquarks decaying to Xi^{-} pi^{-} (Xi^{-} pi^{+}) and corresponding antiparticles has been performed with the ZEUS detector at HERA. The data sample consists of deep inelastic ep scattering events at centre-of-mass energies of 300 and 318 GeV, and corresponds to 121 pb^{-1} of integrated luminosity. A clear signal for Xi^{0}(1530) to Xi^{-} pi^{+} was observed. However, no signal for any new baryonic state was observed at higher masses in either the Xi^{-} pi^{-} or Xi^{-} pi^{+} channels. The searches in the antiparticle channels were also negative. Upper limits on the ratio of a possible Xi^{--}_{3/2} (Xi^{0}_{3/2}) signal to the Xi^{0}(1530) signal were set in the mass range 1650-2350 MeV.

Titolo:	Search for Pentaquarks Decaying to Xi-pi in Deep Inelastic Scattering at HERA
Autore/i:	S. Chekanov; M. Derrick; D. Krakauer; J. H. Loizides 1; S. Magill; B. Musgrave; J. Repond; R. Yoshida; M. C. K. Mattingly; P. Antonioli; G. Bari; BASILE, MAURIZIO; L. Bellagamba; D. Boscherini; A. Bruni; G. Bruni; G. Cara Romeo; CIFARELLI, LUISA; F. Cindolo; CONTIN, ANDREA; M. Corradi; S. De Pasquale; P. Giusti; G. Iacobucci; A. Margotti; A. Montanari; R. Nania; PALMONARI, FEDERICO; A. Pesci; RINALDI, LORENZO; SARTORELLI, GABRIELLA; ZICHICHI, ANTONINO; G. Aghuzumtsyan; D. Bartsch; I. Brock; S. Goers; H. Hartmann; E. Hilger; P. Irrgang; H.
Autore/i Unibo:	S. Chekanov M. Derrick D. Krakauer J. H. Loizides 1 S. Magill B. Musgrave J. Repond R. Yoshida M. C. K. Mattingly P. Antonioli G. Bari BASILE, MAURIZIO L. Bellagamba D. Boscherini A. Bruni G. Bruni G. Cara Romeo CIFARELLI, LUISA F. Cindolo CONTIN, ANDREA M. Corradi S. De Pasquale P. Giusti G. Iacobucci A. Margotti A. Montanari R. Nania PALMONARI, FEDERICO A. Pesci RINALDI, LORENZO SARTORELLI, GABRIELLA ZICHICHI, ANTONINO G. Aghuzumtsyan D. Bartsch I. Brock S. Goers H. Hartmann E. Hilger P. Irrgang H. mostra contributor esterni nascondi contributor esterni
Anno:	2005
Rivista:	PHYSICS LETTERS. SECTION B
Digital Object Identifier (DOI):	http://dx.doi.org/10.1016/j.physletb.2005.02.016
Abstract:	A search for pentaquarks decaying to Xi^{-} pi^{-} (Xi^{-} pi^{+}) and corresponding antiparticles has been performed with the ZEUS detector at HERA. The data sample consists of deep inelastic ep scattering events at centre-of-mass energies of 300 and 318 GeV, and corresponds to 121 pb^{-1} of integrated luminosity. A clear signal for Xi^{0}(1530) to Xi^{-} pi^{+} was observed. However, no signal for any new baryonic state was observed at higher masses in either the Xi^{-} pi^{-} or Xi^{-} pi^{+} channels. The searches in the antiparticle channels were also negative. Upper limits on the ratio of a possible Xi^{--}_{3/2} (Xi^{0}_{3/2}) signal to the Xi^{0}(1530) signal were set in the mass range 1650-2350 MeV.
Data prodotto definitivo in UGOV:	2005-10-20 12:40:19
Appare nelle tipologie:	1.01 Articolo in rivista

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