Evidence for the Θ+ in the γdK+Kpn reaction by detecting K+K pairs

T. Nakano et al.
Phys. Rev. C 79, 025210 – Published 27 February 2009

Abstract

The γdK+Kpn reaction has been studied to search for the evidence of the Θ+ by detecting K+K pairs at forward angles. The Fermi-motion-corrected nK+ invariant mass distribution shows a narrow peak at 1.524±0.002+0.003 GeV/c2. The statistical significance of the peak calculated from a shape analysis is 5.1 σ, and the differential cross section for the γnKΘ+ reaction is estimated to be 12±2 nb/sr in the photon energy range from 2.0 to 2.4 GeV in the LEPS angular range by assuming the isotropic production of the Θ+ in the γn center-of-mass system. The obtained results support the existence of the Θ+.

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  • Received 4 December 2008

DOI:https://doi.org/10.1103/PhysRevC.79.025210

©2009 American Physical Society

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Vol. 79, Iss. 2 — February 2009

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