This pages summarizes search for an exotic baryon state Thetac in CDF data.
The long-standing question of whether there are 5-quark baryons has been reinvigorated in the past year by multiple reports of the existence of a baryon decaying to a KN final state with positive strangeness. This state, the Theta(1540), is manifestly exotic and had been predicted in 1997 as the lightest member of an anti-decuplet of states on the basis of a chiral soliton model by Diakonov, Petrov, and Polyakov Z.Phys.A359:305-314,1997 . There should be a charmed analog of this decuplet. Charmed pentaquarks had been predicted much earlier by other authors based on different models. The H1 experiment recently reported the observation of a narrow baryon at 3099 Mev/c2 decaying to D*p + c.c. (hep-ex/0403017) This state is a candidate for the charmed pentaquark Thetac or perhaps an excited state thereof.
All references to spesific charged state imply charge conjugate state as well
unless specifically stated otherwise.
Below the eps versions of all figures meant for downloads.
A full description of the analysis is in cdfnote 6978