Search for Θ+ and Ξ--3/2 pentaquarks in HERA-B
Abstract
A search for Θ+(1540) and Ξ--3/2(1860) pentaquark candidates has been performed in proton-induced reactions on C, Ti and W targets at \sqrt{s} = 41.6 GeV studying the pK0S respectively Ξ-π- and Ξ-π+ (and charge conjugated (c.c.)) decay channels at mid-rapidity. With sensitivities of Br × dσ/dxF < 5 to 25 μb/nucleon, we find no evidence for narrow pentaquark peaks in any of the studied final states. Preliminary values for the upper limit of relative yield ratios at mid-rapidity are Θ+(1540)/Λ(1520) < 0.02, Br × Ξ--3/2(1862)/Ξ(1530)0 < 0.077 and Br × \bar{\Xi}++3/2(1862)/\bar{\Xi}(1530)0 < 0.058 at 95 % CL.
- Publication:
-
Journal of Physics G Nuclear Physics
- Pub Date:
- August 2004
- DOI:
- 10.1088/0954-3899/30/8/128
- arXiv:
- arXiv:hep-ex/0403020
- Bibcode:
- 2004JPhG...30S1363K
- Keywords:
-
- High Energy Physics - Experiment
- E-Print:
- 4 pages, 3 eps figures, gzipped tar file, contribution to Quark Matter 2004 conference