2012
DOI: 10.1103/physrevc.85.015205
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Upper limits for the photoproduction cross section for theΦ(1860)pentaquark state off the deuteron

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… Show more

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Cited by 4 publications
(2 citation statements)
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“…The electron beam is deflected in the magnetic field of the tagging system after it passed through a radiator with a nominal thickness of 5x10 4 radiation length. The standard electron beam current was chosen to be 30 nA, and it was limited by the drift chamber performance [1]. The trigger required a hit in the tagger in the energy range from 4.5 to 5.5 GeV.…”
Section: Discussionmentioning
confidence: 99%
“…The electron beam is deflected in the magnetic field of the tagging system after it passed through a radiator with a nominal thickness of 5x10 4 radiation length. The standard electron beam current was chosen to be 30 nA, and it was limited by the drift chamber performance [1]. The trigger required a hit in the tagger in the energy range from 4.5 to 5.5 GeV.…”
Section: Discussionmentioning
confidence: 99%
“…Leptons, for which as for quarks there are six different mass eigenstates, can be observed as quasi-free particles in nature, while quarks almost exclusively appear as constituents of bound states (hadrons); due to confinement any observable state in the SM must not carry any net colour charge, such that baryons (consisting of three quarks or three anti-quarks) and mesons (one quark and one anti-quark) are the only bound states of quarks that have been observed so far. The SM does also allow bound states with more constituents -pentaquarks, for instancebut the experimental evidence for such states is controversial [28,29,30,31,32,33]. There are no known bound states with top-quarks because their average lifetime is much smaller than the hadronisation time.…”
Section: Particle Contentmentioning
confidence: 99%