Small size pentaquark in QCD sum rule approach
Abstract
Description
The analysis of the sum rules (for two differentchoices of 5-quark currents) indicate that to explain experimental results it is necessary to have some one-particle lower state (and pentaquark is a reliable candidate to this state) while the two-particle coupled lower state ($NK$ system) should be excluded. Obtained sum rules have good stability and correspond to pentaquark mass $m_θ$=1.54 $GeV$ at the appropriate choice of continuum threshold. Also the features of the sum rules for 2-point correlator with 5-quark currents are studied. This features should be taken into account to obtain sum rules correctly.
14 pages, 3fig, misprintrs are corrected,notation in fig 2,3 are corrected
14 pages, 3fig, misprintrs are corrected,notation in fig 2,3 are corrected