Anticharmed pentaquark Θc(3099) from QCD sum rules

AbstractWe construct QCD sum rules for the anti-charmed pentaquark Θc(3099), recently reported at HERA. The sum rules are constructed similarly with the Θ+(1540) sum rules using the anti-charmed analogue of the Θ+ interpolating field. The strange quark and quark–gluon mixed condensates, which were important in the Θ+ 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 Θc is positive. We identify the difference from the Θ+ sum rule, which leads to the positive parity in this heavy-light pentaquark system. The obtained mass is similar to the experimental value