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χ particle production in π−p collisions at 38 GeV/c |
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| Authors: | F. Binon S.V. Donskov P. Duteil M. Gouanère A.V. Inyakin V.A. Kachanov D.B. Kakauridze G.V. Khaustov A.V. Kulik J.P. Lagnaux A.A. Lednev Yu.V. Mikhailov Th. Mouthuy J.P. Peigneux A. Possoz Yu.D. Prokoshkin Yu.V. Rodnov V.P. Sugonyaev |
| Affiliation: | 1. Institute for High Energy Physics, Serpukhov, USSR.;2. Institut Interuniversitaire des Sciences Nucléaires, Brussels, Belgium.;3. Laboratoire d''Annecy de Physique des Particules, France.;4. CERN, Geneva, Switzerland |
| Abstract: | The production of χ particles in the reaction π?p → χ + … has been studied near threshold. The measurements have been performed at the 70 GeV IHEP proton synchrotron using the hodoscope spectrometer GAMS-2000. The χ particles have been identified through their decay χ → J/ψ + γ, J/ψ → e+e?. In the region XF ?0.4 the fraction of obsered J/ψ particles which is obtained via the decay of χ states is 0.44 ± 0.16. The χ longitudinal and transverse momentum distributions are similar to those obtained for J/ψ. The inclusive production cross section of χ particles (3P1 and 3P2 states) at 38 GeV/c is σXF>0 (π?p → χ + …) = (28±11) nb. |
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