Backward production in $pi$$sup -$p $Yields$ p$pi$$sup +$$pi$$sup - $$pi$$sup -$ at 8 GeV/c

Le résumé fourni par la source

Backward baryon and meson production in $pi$$sup -$p $Yields$ p$pi$$sup +$$pi$$sup -$$pi$$sup -$ at 8.0 GeV/c has been studied using a streamer chamber triggered by the detection of a fast forward proton. Our data sample (1227 events) displays prominent N*rho and N*f quasi-two-body production. These states are investigated with regard to the peripheral nature of the production mechanism and sequential decay of the excited baryon and meson systems. The quasi-two-body production of N*rho and N*f intermediate states is consistent with u-channel proton exchange as the dominant production mechanism. In the $pi$$sup +$$pi$$sup -$$pi$$sup -$ mass distribution a 3- to 4-standard-deviation enhancement is observed at M$sub 3$/sub pi/ = 1897 +- 17 MeV/c$sup 2$ with full width at half maximum = 110 +- 82 MeV/c$sup 2$, but no evidence is found for backward A$sub 1$ or A$sub 2$ production. $delta$$sup ++$(1232) production is observed in the p$pi$$sup +$ effective mass distribution. (AIP)

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