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Experimental Proof of the Existence of the A1 Meson

C DAUM,L HERTZBERGER,W HOOGLAND,S PETERS,P VANDEURZEN,V CHABAUD,B HYAMS,H TIECKE,P WEILHAMMER,A DWURAZNY,G POLOK,M ROZANSKA,M TURALA,J TURNAU,H BECKER,G BLANAR,M CERRADA,H DIETL,J GALLIVAN,M GLAUBMANN,R KLANNER,E LORENZ,G LUTJENS,G LUTZ,W MANNER,U STIERLIN,I BLAKEY,M BOWLER,R CASHMORE,J LOKEN,W SPALDING, G THOMPSON,B ALPER,C DAMERELL,A GILLMAN,C HARDWICK,M HOTCHKISS,F WICKENS

Physics letters B（1980）

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Abstract
In partial wave analyses of the (π−π−π+) system, substantial shape changes of the 1+S (ϱπ) intensity as a function of t, and relative phase changes of ≈ 90°, provide compelling evidence for a resonant A1 of mass ≈ 1280 MeV and width ≈ 300 MeV.
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