Observation of an Enhancement in <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><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup></mrow><mrow><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></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><mo>→</mo><mrow><msup><mrow><mi>K</mi></mrow><mrow><mo>+</mo></mrow></msup></mrow><mrow><msup><mrow><mi>K</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow></math> Cross Sections at <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></math> Momentum of ∼ 500 MeV/c

T. Tanimori; T. Fujii; T. Kageyama; K. Nakamura; F. Sai; S. Sakamoto; S. Sato; T. Takahashi; S. S. Yamamoto; Y. Takada

doi:10.1103/PhysRevLett.55.1835

Observation of an Enhancement in $\bar{p} p \to π^{+} π^{-}$ and $\bar{p} p \to K^{+} K^{-}$ Cross Sections at $\bar{p}$ Momentum of ∼ 500 MeV/c

T. Tanimori, T. Fujii, T. Kageyama, K. Nakamura, F. Sai, S. Sakamoto, S. Sato, T. Takahashi, S. S. Yamamoto, and Y. Takada

Phys. Rev. Lett. 55, 1835 – Published 28 October 1985

Abstract

The reactions $\bar{p} p \to π^{+} π^{-}$ and $K^{+} K^{-}$ have been studied at 390, 490, 590, 690, and 780 MeV/c. An enhancement of about 150 μb has been observed in the cross sections of both reactions at the same beam momentum of 490 MeV/c. If this structure is interpreted as a meson resonance, it has a mass of 1940 ± 20 MeV and a width of less than 40 MeV.

Received 4 June 1985

DOI:https://doi.org/10.1103/PhysRevLett.55.1835

Authors & Affiliations

T. Tanimori^*, T. Fujii, T. Kageyama^*, K. Nakamura^*, F. Sai, S. Sakamoto^†, S. Sato^‡, T. Takahashi, and S. S. Yamamoto

Department of Physics, University of Tokyo, Tokyo 113, Japan

Y. Takada

Institute of Applied Physics, University of Tsukuba, Sakura, Ibaraki 305, Japan

^*Present address: National Laboratory for High Energy Physics, Oho, Ibaraki 305, Japan.
^†Present address: Rutherford-Appleton Laboratory, Chilton, Didcot, Oxon, United Kingdom.
^‡Present address: Computer Engineering Division, NEC Corporation, Fuchu-shi, Tokyo 183, Japan.