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Observation of a spin 4 neutral meson with 2 GeV mass decaying in $\pi^{0} \pi^{0}$

The invariant mass spectrum of neutral meson states from π−p interactions at 40 GeV/c incident momentum has been investigated in a high statistics experiment performed at the 70 GeV IHEP accelerator. To detect the high energy photons coming from the produced neutral states, a hodoscope spectrometer...

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Detalles Bibliográficos
Autores principales: Apel, W D, Augenstein, K., Bertolucci, E., Donskov, S.V., Inyakin, A.V., Kachanov, V.A., Kittenberger, W., Krasnokutsky, R.N., Kruger, M., Leder, G., Lednev, A.A., Mannelli, I., Mikhailov, Yu.V., Müller, H., Pierazzini, G.M., Prokoshkin, Yu.D., Quaglia, M., Schneider, H., Scribano, A., Sergiampietri, F., Shuvalov, R.S., Sigurdsson, G., Steuer, M., Vincelli, M.L.
Lenguaje:eng
Publicado: 1975
Materias:
Acceso en línea:https://dx.doi.org/10.1016/0370-2693(75)90480-3
http://cds.cern.ch/record/1221882
Descripción
Sumario:The invariant mass spectrum of neutral meson states from π−p interactions at 40 GeV/c incident momentum has been investigated in a high statistics experiment performed at the 70 GeV IHEP accelerator. To detect the high energy photons coming from the produced neutral states, a hodoscope spectrometer with a computer on-line was used. A clear structure on the mass spectrum of dipions produced in the reaction π−p→π°π°n is observed at 2 GeV. The decay angular distributions show in this mass region the variation with mass typical of a state with a spin J = 4. The mass of the observed meson is found to be M = (2020±30)MeV and the estimate of the full width is (180±60) MeV.