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.
Egiyan, H., Langheinrich, J., Gothe, R., Graham, L., Holtrop, M., Lu, H., et al. (2012). Upper limits for the photoproduction cross section for the phi(--)(1860) pentaquark state off the deuteron. PHYSICAL REVIEW. C, NUCLEAR PHYSICS, 85(14), 015205-1-015205-9 [10.1103/PhysRevC.85.015205].
Upper limits for the photoproduction cross section for the phi(--)(1860) pentaquark state off the deuteron
D'ANGELO, ANNALISA;
2012-01-30
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 GeVI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
