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Upper limits for the photoproduction cross section for the Phi--(1860) pentaquark state off the deuteron

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arxiv 1109.1238 v2 pith:RO2BYKVA submitted 2011-09-06 nucl-ex

Upper limits for the photoproduction cross section for the Phi--(1860) pentaquark state off the deuteron

H. Egiyan , J. Langheinrich , R.W. Gothe , L. Graham , M. Holtrop , H. Lu , P. Mattione , G. Mutchler
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K. Park E.S. Smith S. Stepanyan Z.W. Zhao CLAS Collaboration
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keywords massphi--photoproductioncrossdecaydeuteronpentaquarksection
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We searched for the Phi--(1860) pentaquark in the photoproduction process off the deuteron in the Xi- pi- decay channel using CLAS. The invariant mass spectrum of the Xi- pi- system does not indicate any statistically significant enhancement near the reported mass M = 1.860 GeV. The statistical analysis of the sideband-subtracted mass spectrum yields a 90% confidence level upper limit of 0.7 nb for the photoproduction cross section of Phi--(1860) with a consecutive decay into Xi- pi- in the photon energy range 4.5 GeV < Egamma < 5.5 GeV.

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