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Search for exotic S=−2 baryons in pp collisions at s√=1.96  TeV

CollaborationWith : Campanelli, Mario / Clark, Allan Geoffrey / Donega, Mauro / Moed, Shulamit / Sfyrla, Anna / Vallecorsa, Sofia / Wu, Xin
Published in Physical Review. D. 2007, vol. 75, no. 03, p. 032003
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 220  pb−1 of pp collisions at s√=1.96  TeV 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 1600–2100  MeV/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>2  GeV/c and |y|<1 as a function of pentaquark mass. At 1862  MeV/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.
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CDF COLLABORATION. Search for exotic S=−2 baryons in pp collisions at s√=1.96  TeV. In: Physical Review. D, 2007, vol. 75, n° 03, p. 032003. https://archive-ouverte.unige.ch/unige:38428

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Deposited on : 2014-07-03

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