Abstract
We investigate the mass spectrum of the pentaquark baryon ( udud s ¯ ) in quenched lattice QCD with exact chiral symmetry. Using 3 different interpolating operators, we measure the 3 × 3 correlation matrix and obtain the eigenvalues A ± ( t ) with ± parity. For odd parity states, A − ( t ) deviates from pure exponential decay even at large t , which implies that it cannot be a resonance with narrow decay width, thus is ruled out as a candidate of Θ + ( 1540 ) . For even parity states, they behave like usual resonances seen in quenched lattice QCD, and the mass of the lowest lying J P = 1 / 2 + state is determined to be 1583 ± 121 MeV.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
