Anticharmed pentaquark Θc(3099) from QCD sum rules

We construct QCD sum rules for the anti-charmed pentaquark Theta(c)(3099), recently reported at HERA. The sum rules are constructed similarly with the Theta(+)(1540) sum rules using the anti-charmed analogue of the Theta(+) interpolating field. The strange quark and quark-gluon mixed condensates, which were important in the Theta(+) sum rules, are replaced by the gluon condensates whose contribution to the OPE is suppressed due to the heavy quark mass. Our result suggests that the parity of Theta(c), is positive. We identify the difference from the Theta(+) sum rule, which leads to the positive parity in this heavy-light pentaquark system. The obtained mass is similar to the experimental value. (C) 2004 Elsevier B.V. All rights reserved.