Article
Search for the Theta(+) Pentaquark in the reaction gamma d -> pK(-)K(+)n
Physical Review Letters
(2006)
Abstract
A search for the Θ+ in the reaction γd→pK-K+n was completed using the CLAS detector at Jefferson Lab. A study of the same reaction, published earlier, reported the observation of a narrow Θ+ resonance. The present experiment, with more than 30 times the integrated luminosity of our earlier measurement, does not show any evidence for a narrow pentaquark resonance. The angle-integrated upper limit on Θ+ production in the mass range of 1.52–1.56 GeV/c2 for the γd→pK-Θ+ reaction is 0.3 nb (95% C.L.). This upper limit depends on assumptions made for the mass and angular distribution of Θ+ production. Using Λ(1520) production as an empirical measure of rescattering in the deuteron, the cross section upper limit for the elementary γn→K-Θ+ reaction is estimated to be a factor of 10 higher, i.e., ∼3 nb (95% C.L.).
Disciplines
Publication Date
January 1, 2006
Publisher Statement
Doi:10.1103/PhysRevLett.96.212001
Copyright 2006 by The American Physical Society.
http://prl.aps.org/pdf/PRL/v96/i21/e212001
Citation Information
B McKinnon, K Hicks, NA Baltzell, DS Carman, et al.. "Search for the Theta(+) Pentaquark in the reaction gamma d -> pK(-)K(+)n" Physical Review Letters Vol. 96 Iss. 21 (2006) Available at: http://works.bepress.com/michael_williams/28/