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Study of unstable particle through the spectral function in O(4) $��^4$ theory
Description
We test application of the maximum entropy method to decompose the states contributing to the unstable $��$ correlation function through the spectral function in the four dimensional O(4) $��^4$ theory. Reliable results are obtained for the $��$ mass and two-particle $����$ state energy using only the $��$ correlation function. We also find that the property of the $��$ particle is different between the unstable ($m_��/m_��>2$) and stable ($m_��/m_��<2$) cases.
Lattice2002(spectrum), 3 pages
