Boson states in the reaction π− + p → π− + π− + π+ + p with leading π+ meson at 25 GeV/c

Yu.M. Antipov,R. Busnello,G. Damgaard,M.N. Kienzle-Focacci,W. Kienzle, R. Klanner,L.G. Landsberg,A.A. Lebedev,C. Lechanoine,P. Lecomte,M. Martin,S.A. Polovnikov,V.N. Roinishvili,R.D. Sard,A. Weitsch,F.A. Yotch

Nuclear Physics B（1977）

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摘要

The reaction π− + p → π− + π− + π+ + p at 25 GeV/c was studied in the mass region M3π ⩾ 1.8 GeV with leading π+. The mass spectrum of the π+π− system shows peaks corresponding to the ϱ0, f and g0 resonances and an enhancement around 1.9 GeV. Evidence is presented for a JP = 3+ s-wave g0π− state (A4) similar to the ϱ0π−(A1) and fπ− (A3) threshold enhancements.

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