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It is argued that in the antiproton-proton annihilation into two mesons $\barpp\longrightarrow m_1 m_2$, the origin of different restrictive angularmomentum selection rules commonly obtained for planar annihilation diagrams$A2$ and for non-planar rearrangement diagrams $R2$ lies in the omission ofmomentum transfer between an annihilated antiquark-quark pair and a remainingquark or antiquark. If it is included, there is no reason for dismissing onetype of diagram in favor of another one. Some considerations in the large $N_c$limit of QCD equally shed light on the planar and non-planar contributions tothe total $\bar NN\to m_1 m_2$ annihilation amplitude.Comment: As published in PRC 12/200

physical review. c. nuclear physics/physical review. c, nuclear physics

Planar versus non-planar<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mover><mml:mrow><mml:mi fontweight="bold">N</mml:mi></mml:mrow><mml:mrow><mml:mrow /><mml:mo>¯</mml:mo></mml:mrow></mml:mover><mml:mi>N</mml:mi></mml:mrow></mml:math>annihilation into mesons in the light of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mover><mml:mrow><mml:mi fontweight="bold">q</mml:mi></mml:mrow><mml:mrow><mml:mrow /><mml:…

Planar versus non-planarN¯Nannihilation into mesons in the light ofq