Evidence for an exotic S=-2, Q=-2 baryon resonance in proton-proton collisions at the CERN SPS

Results of resonance searches in the Xi - pi -, Xi - pi +, Xi -bar+ pi -, and Xi -bar+ pi + invariant mass spectra in proton-proton collisions at sqrt[s]=17.2 GeV are presented. Evidence is shown for the existence of a n
Results of resonance searches in the Xi - pi -, Xi - pi +, Xi -bar+ pi -, and Xi -bar+ pi + invariant mass spectra in proton-proton collisions at sqrt[s]=17.2 GeV are presented. Evidence is shown for the existence of a narrow Xi - pi - baryon resonance with mass of 1.862±0.002 GeV/c2 and width below the detector resolution of about 0.018 GeV/c2. The significance is estimated to be above 4.2 sigma . This state is a candidate for the hypothetical exotic Xi --3/2 baryon with S=-2, I=3 / 2, and a quark content of (dsdsu-bar). At the same mass, a peak is observed in the Xi - pi + spectrum which is a candidate for the Xi 03/2 member of this isospin quartet with a quark content of (dsusd-bar). The corresponding antibaryon spectra also show enhancements at the same invariant mass.
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Metadaten
Author:Christopher Alt, L. Betev, Anja Billmeier, Christoph Blume, Roland Bramm, P. Buncic, Peter Dinkelaker, Dominik Bernhard Flierl, Marek Gazdzicki, Stefan Kniege, Thorsten Kollegger, Christine Meurer, Michael Kosta Mitrovski, R. Renfordt, Reinhard Stock, Herbert Ströbele, Alexander Albert Wetzler, Jacek Zaranek, et al., NA49 Collaboration
URN:urn:nbn:de:hebis:30-19188
Document Type:Article
Language:English
Date of Publication (online):2005/10/14
Year of first Publication:2004
Publishing Institution:Univ.-Bibliothek Frankfurt am Main
Release Date:2005/10/14
Source:Phys. Rev. Lett. 92, 042003 (2004), ©2004 The American Physical Society, http://link.aps.org/abstract/PRL/v92/e042003
HeBIS PPN:191521574
Institutes:Physik
Dewey Decimal Classification:530 Physik
PACS-Classification:12.39.-x Phenomenological quark models
13.75.Cs Nucleon-nucleon interactions (including antinucleons, deuterons, etc.) (for <i>N</i>-<i>N</i> interactions in nuclei, see 21.30.-x)
14.20.Jn Hyperons
Sammlungen:Universitätspublikationen
Licence (German):License Logo Veröffentlichungsvertrag für Publikationen

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