QCD: The $ \Lambda$ (1405) as a hybrid
نویسندگان
چکیده
منابع مشابه
The 1405 MeV Lambda Resonance in Full-QCD
The negative-parity ground state of the Λ baryon lies surprisingly low in mass. At 1405.1MeV, it lies lower than the negative-parity ground state nucleon, even though it has a valence strange quark. Using the PACS-CS (2+ 1)-flavour full-QCD ensembles available through the ILDG, we employ a variational analysis using source and sink smearing to investigate the low-energy, odd-parity spectrum of ...
متن کاملQCD Sum Rule for Λ ( 1405 )
Motivated by the recently constructed interpolation field for S11(1535), we propose a new interpolating field for Λ(1405). Using this current, we calculate the mass of Λ(1405) based on the conventional QCD sum rule analysis. By calculating the Wilson coefficients up to dimension 8 operators and taking into account the mass corrections from s-quark, we find the calculated mass of Λ(1405) to be v...
متن کاملFive-quark picture of Λ(1405) in anisotropic lattice QCD
Noriyoshi Ishii1∗), Takumi Doi2,3, Makoto Oka4, and Hideo Suganuma5 1 Center for Computational Sciences, Univ. of Tsukuba, Tsukuba 305–8577, Japan 2 Dept. of Physics and Astronomy, Univ. of Kentucky, Lexington KY 40506, USA 3 RIKEN BNL Research Center, Brookhaven National Lab., New York 11973, USA 4 Department of Physics, Tokyo Institute of Technology, Tokyo 152–8551, Japan 5 Department of Phyi...
متن کاملTwo - flavor lattice QCD study of Λ ( 1405 ) Toru
Low-lying Λ baryons with spin 1/2 are analyzed in two-flavor unquenched lattice QCD. We construct 2×2 cross correlators from flavor SU(3) “octet” and “singlet” baryon operators, and diagonalize them so that we can extract two low-lying states for each parity. The two-flavor CP-PACS gauge configurations are employed, which are generated in the renormalization-group improved gauge action and the ...
متن کاملΛ(1405) and Negative-Parity Baryons in Lattice QCD
We review briefly recent studies of the Λ(1405) spectrum in Lattice QCD. Ordinary three-quark pictures of the Λ(1405) in quenched Lattice QCD fail to reproduce the mass of the experimental value, which seems to support the penta-quark picture for the Λ(1405) such as a K̄N molecule-like state. It is also noted that the present results suffer from relatively large systematic uncertainties coming f...
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ژورنال
عنوان ژورنال: The European Physical Journal A
سال: 2011
ISSN: 1434-6001,1434-601X
DOI: 10.1140/epja/i2011-11008-5