A Measurement of the S and $P$ Wave Content of Anti-proton Annihilation at Rest Into Two Pions in Liquid Deuterium

The Athens-Irvine-Karlsruhe-New Mexico-Pennsylvania State collaboration Angelopoulos, A. ; Apostolakis, A. ; Armstrong, T.A. ; et al.
Phys.Lett.B 212 (1988) 129-132, 1988.
Inspire Record 269695 DOI 10.17182/hepdata.29910

Based on our measurement of the ratio f(π − π 0 p ) f(π + π − n ) =2.07±0.05 for antiproton annihilation at rest in liquid deuterium, we find that S-wave annihilation of the antiproton on the proton or neutron into ππ is dominant. We quote a 95% confidence level upper limit of 8% for P-wave annihilation into ππ.

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