Abstract
The importance of measuring the non - D D ¯ decays of the ψ″ = ψ (3770) resonance is discussed. These decays can shed light on a possible discrepancy between the total and D D ¯ cross-sections at the ψ″, and on a proposed mechanism for enhancement of penguin amplitudes in B meson decays through charm–anticharm annihilation. Measurements (including the ψ″ line shape) in states of definite G-parity and in inclusive charmless final states such as η′ + X are found to be particularly important.
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