QCD Sum Rule Study for a Possible Charmed Pentaquark c(3250)
Abstract
We use QCD sum rules to study the possible existence of a c(3250) charmed pentaquark. We consider the contributions of condensates up to dimension-10 and work at leading order in αs. We obtain m( c) = (3.21 +/- 0.13) GeV, compatible with the mass of the structure seen by BaBar Collaboration in the decay channel B- -> p- c++ pi- pi-. The proposed state is compatible with a previous proposed pentaquark state in the anti-charmed sector.
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