Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-03-02
Phys.Rev.D72:034505,2005
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTeX, 23 pages, 11 EPS figures, to appear in Physical Review D
Scientific paper
10.1103/PhysRevD.72.034505
We investigate the mass spectrum of the pentaquark baryon ($ udud \bar s $) in quenched lattice QCD with exact chiral symmetry. Using 3 different interpolating operators for $ \Theta $, we measure the $ 3 \times 3 $ correlation matrix and obtain the eigenvalues $ A^{\pm} (t) $ with $ \pm $ parity, for 100 gauge configurations generated with Wilson gauge action at $ \beta = 6.1 $ on the $ 20^3 \times 40 $ lattice. For the lowest-lying $ J^P = 1/2^- $ state, its mass is almost identical to that of the KN S-wave, while for the lowest-lying $ J^P = 1/2^+ $ state, its mass is smaller than that of the KN P-wave, especially for the regime $ m_u < m_s $. By chiral extrapolation (linear in $m_\pi^2$) to $ m_\pi = 135 $ MeV, we obtain the masses of the lowest-lying states: $ m(1/2^-) = 1424(57) $ MeV and $ m(1/2^+) = 1562(121) $ MeV, in agreement with the masses of $ m_K + m_N \simeq 1430 $ MeV and $ \Theta^+(1540) $ respectively.
Chiu Ting-Wai
Hsieh Tung-Han
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