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In this paper we study the possibility of bootstrapping the unnatural-parity meson states, using finite-energy sum rules. Previous work on this bootstrap scheme was confined to natural-parity states. We find a large number of sum rules involving particles which are not firmly established, with results that are in good agreement with experiment (10%). The equations, though not mathematically consistent, are such that the two sides (Regge and resonances) are equal when t is varied over a large region, and we find several mass formulas, including mH²=2m_ρ²-3/2m_π², mB=m_A₂-m_π, 2mB²=0.5 BeV²+2m_δ²+m_ω²+m_π², and relations between coupling constants.
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Bishari et al. (1968) studied this question.
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