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Search for exotic S=-2 baryons in pp̄ collisions at s=1.96TeV

  • A. Abulencia
  • , J. Adelman
  • , T. Affolder
  • , T. Akimoto
  • , M. G. Albrow
  • , D. Ambrose
  • , S. Amerio
  • , D. Amidei
  • , A. Anastassov
  • , K. Anikeev
  • , A. Annovi
  • , J. Antos
  • , M. Aoki
  • , G. Apollinari
  • , J. F. Arguin
  • , T. Arisawa
  • , A. Artikov
  • , W. Ashmanskas
  • , A. Attal
  • , F. Azfar
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Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

A search for a manifestly exotic S=-2 baryon state decaying to Ξ-π-, and its neutral partner decaying to Ξ-π+, has been performed using 220pb-1 of pp̄ collisions at s=1.96TeV collected by the Collider Detector at Fermilab. The Ξ- trajectories were measured in a silicon tracker before their decay, resulting in a sample with low background and excellent position resolution. No evidence was found for S=-2 pentaquark candidates in the invariant mass range of 1600-2100MeV/c2. Upper limits on the product of pentaquark production cross section times its branching fraction to Ξ-π+,-, relative to the cross section of the well-established Ξ(1530) resonance, are presented for neutral and doubly negative candidates with pT>2GeV/c and |y|<1 as a function of pentaquark mass. At 1862MeV/c2, these upper limits for neutral and doubly negative final states were found to be 3.2% and 1.7% at the 90% confidence level, respectively.

Original languageEnglish
Article number032003
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume75
Issue number3
DOIs
StatePublished - 8 Feb 2007

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