Search for Narrow <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mrow><mover><mrow><mi>p</mi></mrow><mrow><mi>¯</mi></mrow></mover></mrow></mrow><mi>p</mi></math> States in the Reactions <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mrow><mover><mrow><mi>p</mi></mrow><mrow><mi>¯</mi></mrow></mover></mrow></mrow><mi>p</mi><mo>→</mo><mrow><mrow><mover><mrow><mi>p</mi></mrow><mrow><mi>¯</mi></mrow></mover></mrow></mrow><mi>p</mi><mi></mi><mrow><msup><mrow><mi>π</mi></mrow><mrow><mn>0</mn></mrow></msup></mrow></math> and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mrow><mover><mrow><mi>p</mi></mrow><mrow><mi>¯</mi></mrow></mover></mrow></mrow><mi>p</mi><mi></mi><mrow><msup><mrow><mi>ρ</mi></mrow><mrow><mn>0</mn></mrow></msup></mrow></math> at 5 GeV/c

S. U. Chung; R. Fernow; H. Kirk; A. Lesnik; S. D. Protopopescu; D. Weygand; J. Bensinger; L. Kirsch; W. Morris; R. Poster; P. Schmidt; B. T. Meadows; J. Albright; R. Diamond; H. Fenker; J. H. Goldman; V. Hagopian; C. M. Jenkins; Z. Bar-Yam; J. Dowd; W. Kern; M. Winik

doi:10.1103/PhysRevLett.46.395

Search for Narrow $\bar{p} p$ States in the Reactions $\bar{p} p \to \bar{p} p π^{0}$ and $\bar{p} p ρ^{0}$ at 5 GeV/c

S. U. Chung, R. Fernow, H. Kirk, A. Lesnik, S. D. Protopopescu, D. Weygand, J. Bensinger, L. Kirsch, W. Morris, R. Poster, P. Schmidt, B. T. Meadows, J. Albright, R. Diamond, H. Fenker, J. H. Goldman, V. Hagopian, C. M. Jenkins, Z. Bar-Yam, J. Dowd, W. Kern, and M. Winik

Phys. Rev. Lett. 46, 395 – Published 9 February 1981

Abstract

A search for narrow $\bar{p} p$ states (width ≲ 20 MeV/ $c^{2}$ ) has been conducted in the Brookhaven National Laboratory multiparticle spectrometer. No significant structure has been observed in events where the $\bar{p} p$ system has been produced forward in the laboratory. Upper limit cross sections (95% confidence level) for $\bar{p} p$ masses below 2.2 ${G e V / c}^{2}$ are ≤0.12 μb and ≤0.22 μb for the final states $\bar{p} p π^{0}$ and $\bar{p} p ρ^{0}$ , respectively.