Evidence that absorption in the π+ π− π− system in nuclear matter is stronger in the JP = 0− than in the JP = 1+ state期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Evidence that absorption in the π+ π− π− system in nuclear matter is stronger in the JP = 0− than in the JP = 1+ state

Authors:	W. Beusch E. Polgar D. Websdale K. Freudenreich F.X. Gentit P. Muhlemann J. Pernegr W. Wetzel P. Astbury J.G. Lee M. Letheren G. Bellini M. Di Corato F. Palombo P.G. Rancoita G. Vegni

Affiliation:	CERN, Geneva, Switzerland;Laboratorium fur Hochenergiephysik, ETH, Zürich, Switzerland;Imperial College, London, England;Istituto di Fisica, Sezione INFN, Milano, Italy

Abstract:	In the reaction π^? + A → π⁺π^?π^? + A at 15.1 GeV/c the coherently produced 3π mass spectrum has a broad peak around 1.1 GeV which consists mainly of a J^P = 1⁺ state and of a smaller fraction of 0^-. Comparing the observed dependence of the production of these diffractive states on the atomic weight A of the target nuclei with the optical model, we have studied the absorption of the produced states in nuclear matter. We have found the following values of the absorption cross-sections: σ₂(0^-) = 49_?7⁺⁹ mb and σ₂(1⁺) = 15.8_?1.3^+1.5 mb.

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