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

Journal Article · Thu Jan 01 04:00:00 EST 1976 · Phys. Rev., D, v. 13, no. 1, pp. 5-21

OSTI ID:4043275

Abashian, A; Eisenstein, B; Hansen, J D; Mollet, W; Morris, G R; Nelson, B; O'Halloran, T; Orr, J R; Rhines, D; Schultz, P; Sokolsky, P; Wagner, R G; Watson, J; Gelfand, N M; Buttram, M

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)

• Research Organization: University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
• NSA Number: NSA-33-024575
• OSTI ID: 4043275
• Journal Information: Phys. Rev., D, v. 13, no. 1, pp. 5-21, Journal Name: Phys. Rev., D, v. 13, no. 1, pp. 5-21; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

*N*RESONANCES-- PARTICLE PRODUCTION
*PION-PROTON INTERACTIONS-- PARTICLE PRODUCTION
641106*
GEV RANGE 01-10
N64260* --Physics (High Energy)--Particle Interactions & Properties (Theoretical)--Strong (Baryon No. = 1)
PIONS MINUS
PIONS PLUS
PROTONS
RHO-765 RESONANCES
STREAMER SPARK CHAMBERS F-1540 RESONANCES