We 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.
|Number of pages||8|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2004 Aug 12|
Bibliographical noteFunding Information:
We are grateful to M. Oka and Fl. Stancu for fruitful discussions. The work of S.H.L. was supported by KOSEF under Grant No. 1999-2-111-005-5. The work of Y.O. was supported by Forschungszentrum-Jülich, contract No. 41445282 (COSY-058).
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics