We searched for the Φ−−(1860) pentaquark in the photoproduction process off the deuteron in the Ξ−π−decay channel using CLAS. The invariant mass spectrum of the Ξ−π− 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 Φ−−(1860) with a consecutive decay into Ξ−π− in the photon energy range 4.5 GeV< Eγ<5.5 GeV.
Upper limits for the photoproduction cross section for the phi(--)(1860) pentaquark state off the deuteron
CONTALBRIGO, Marco;PAPPALARDO, Luciano Libero;
2012
Abstract
We searched for the Φ−−(1860) pentaquark in the photoproduction process off the deuteron in the Ξ−π−decay channel using CLAS. The invariant mass spectrum of the Ξ−π− 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 Φ−−(1860) with a consecutive decay into Ξ−π− in the photon energy range 4.5 GeV< Eγ<5.5 GeV.File in questo prodotto:
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