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An alternative interpretation of the Theta(1540) peak in the gamma d -> K(+)K(-)np

Author:
Torres, A. Martinez  Oset, E.  


Journal:
INTERNATIONAL CONFERENCE ON THE STRUCTURE OF BARYONS (BARYONS '10)


Issue Date:
2011


Abstract(summary):

We use a theoretical model to study the gamma d -> K(+)K(-)np reaction adapted to the particular features of the experiment performed by the LEPS collaboration in which a signal in the K(+)n invariant mass was found and associated to the Theta(1540) pentaquark peak. Our study shows that the prescription used at LEPS to reconstruct the K(+)n invariant mass creates an artificial broad structure in the Theta(1540) region and that the LEPS collaboration underestimated the background in that region, such that the signal observed for the Theta(1540) is compatible with a fluctuation of 2 sigma over the calculated background.


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