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

CDF Collaboration

doi:10.1103/PhysRevD.75.032003

Scientific article

English

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

Contributors

CDF Collaboration

Collaborators

Campanelli, Mario; Clark, Allan Geoffrey; Donega, Mauro; Moed, Shulamit; Sfyrla, Anna; Vallecorsa, Sofia; Wu, Xin

Published in

Physical review. D. Particles, fields, gravitation, and cosmology, vol. 75, no. 03, 032003

Publication date

2007

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.

UNIGE affiliation entities

Faculté des sciences / Section de physique / Département de physique nucléaire et corpusculaire

Citation (ISO format)

CDF Collaboration. Search for exotic S=−2 baryons in pp collisions at s√=1.96 TeV. In: Physical review. D. Particles, fields, gravitation, and cosmology, 2007, vol. 75, n° 03, p. 032003. doi: 10.1103/PhysRevD.75.032003

Article (Published version)

Identifiers

PID : unige:38428
DOI : 10.1103/PhysRevD.75.032003

Additional URL for this publication

http://journals.aps.org/prd/abstract/10.1103/PhysRevD.75.032003

Journal ISSN

1550-2368

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215downloads

Creation

03/07/2014 10:26:00

First validation

03/07/2014 10:26:00

Update

13/10/2025 22:34:11

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Last indexation

10/11/2026 16:58:02