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In order to test the existence of X(2.8) and the validity of interpreting it as a pseudoscalar cc̅ meson, and also to test the existence of a possible state cc̅ cc̅, it is proposed to measure the recoil-mass spectrum against J/ψ(3.1) at the c.m. energy about 6 GeV in e+e- annihilation. This also serves to check the Okubo-Zweig-Iizuka rule

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

How to find<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>η</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>and a possible state<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>c</mml:mi><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>c</mml:mi></mml:mrow><mml:mrow><mml:mi>¯</mml:mi></mml:mrow></mml:mover></mml:mrow></mml:mrow><mml:mi /><mml:mi>c</mml:mi…

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