







Item type: | Article | ||||
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Journal or Publication Title: | Physics Letters B | ||||
Publisher: | ELSEVIER SCIENCE BV | ||||
Place of Publication: | AMSTERDAM | ||||
Volume: | 585 | ||||
Number of Issue or Book Chapter: | 3-4 | ||||
Page Range: | pp. 213-222 | ||||
Date: | 2004 | ||||
Institutions: | Physics > Institute of Theroretical Physics > Chair Professor Schäfer > Group Andreas Schäfer | ||||
Identification Number: |
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Keywords: | SKYRME MODEL; POSITIVE-STRANGENESS; EXOTIC HADRONS; PENTAQUARK; DECUPLET; DETECTOR; glueball and nonstandard multi-quark/gluon states; photon and charged-lepton interactions with hadrons; baryon production; baryons | ||||
Dewey Decimal Classification: | 500 Science > 530 Physics | ||||
Status: | Published | ||||
Refereed: | Yes, this version has been refereed | ||||
Created at the University of Regensburg: | Yes | ||||
Item ID: | 71631 |
Abstract
Evidence for a narrow baryon state is found in quasi-real photoproduction on a deuterium target through the decay channel pK(S)(0) --> ppi(+)pi(-). A peak is observed in the pK(S)(0) invariant mass spectrum at 1528 +/- 2.6(stat) +/- 2.1(syst) MeV. Depending on the background model, the naive statistical significance of the peak is 4-6 standard deviations and its width may be somewhat larger than ...

Abstract
Evidence for a narrow baryon state is found in quasi-real photoproduction on a deuterium target through the decay channel pK(S)(0) --> ppi(+)pi(-). A peak is observed in the pK(S)(0) invariant mass spectrum at 1528 +/- 2.6(stat) +/- 2.1(syst) MeV. Depending on the background model, the naive statistical significance of the peak is 4-6 standard deviations and its width may be somewhat larger than the experimental resolution of sigma = 4.3-6.2 MeV. This state may be interpreted as the predicted S = +1 exotic Theta(+)(uudd (s) over bar) pentaquark baryon. No signal for an hypothetical Theta(++) baryon was observed in the pK(+) invariant mass distribution. The absence of such a signal indicates that an isotensor Theta is excluded and an isovector Theta is unlikely. (C) 2004 Elsevier B.V. All rights reserved.
Metadata last modified: 19 Dec 2024 15:16