2004/08/13 by B Collaboration, Mark Raymond Adams, I. Abt +97 · 4 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.1103/physrevlett.93.212003
published as Phys.Rev.Lett.93:212003,2004 · LATEX, 5 pages, 3 figures, 2 tables, gzipped tar-file
arxiv created 2004/08/13 · openalex publication_date 2004/11/18 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04
We have searched for \ensuremathΘ+(1540) and \ensuremathΞ--(1862) pentaquark candidates in proton-inducedreactions on C, Ti, and W targets at midrapidity and √(s)=41.6 GeV. In 2\ifmmode×\else\texttimes\fi108 inelastic eventswe find no evidence for narrow (\ensuremathσ\ensuremath≈5 MeV) signals in the \ensuremathΘ+\ensuremath→pKS0 and \ensuremathΞ--\ensuremath→\ensuremathΞ^\ensuremath-\ensuremathπ^\ensuremath- channels; our 95% C.L. upper limits (UL) forthe inclusive production cross section times branching fraction B d\ensuremathσ/dy|_y\ensuremath≈0 are (4--16)\ensuremathμb/N for a \ensuremathΘ+ mass between 1521 and 1555 MeV,and 2.5\ensuremathμb/N for the \ensuremathΞ--. The UL of the yield ratio of \ensuremathΘ+/\ensuremathΛ(1520)<(3--12)% is significantly lower than model predictions.Our UL of B \ensuremathΞ--/\ensuremathΞ(1530)0<4% is at variance with the results that have provided the first evidencefor the \ensuremathΞ--.