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Open Access item Novel Interpretation of the "Theta(+)(1540) Pentaquark" Peak

Authors:Martínez Torres, Alberto
Oset, Eulogi
Issue Date:26-Aug-2010
Publisher:American Physical Society
Citation:Physical Review Letters 105 (9): 092001 (2010)
Abstract:We use a theoretical model of the gamma d --> K+K- np reaction adapted to the experiment done at LEPS where a peak was observed and associated with the Theta(+)(1540) pentaquark. The study shows that the method used in the experiment to assign momenta to the undetected proton and neutron, together with the chosen cuts, necessarily creates an artificial broad peak in the assumed K(+)n invariant mass in the region of the claimed Theta(+)(1540), such that the remaining strength seen for the experimental peak is compatible with a fluctuation of 2 sigma significance.
Publisher version (URL):http://dx.doi.org/10.1103/PhysRevLett.105.092001
Appears in Collections:(IFIC) Artículos

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