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Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Lattice study of the exotic s = +1 baryon
1Department of Physics, University of Tokyo, Tokyo 113-0033, Japan. ssasaki@phys.s.u-tokyo.ac.jp
Abstract:
We propose S = +1 baryon interpolating operators, which are based on an exotic description of the antidecuplet baryon, like the diquark-diquark-antiquark structure. By using one of the new operators, the mass spectrum of the spin-1/2 pentaquark states is calculated in quenched lattice QCD at beta = 6/g(2) = 6.2 on a 32(3) x 48 lattice. It is found that the J(P) assignment of the lowest Theta(uudds) state is most likely (1/2)(-). We also calculate the mass of the charm analog of the Theta and find that the Theta(c)(uuddc) state lies much higher than the DN threshold, in contrast to several model predictions.
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