Evidence for Exotic Meson Production in the Reaction {ital {pi}}{sup {ital {minus}}}{ital p{r_arrow}{eta}{pi}}{sup {ital {minus}}}{ital p} at 18 GeV/{ital c}

Journal Article · Mon Sep 01 04:00:00 EDT 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.79.1630· OSTI ID:565528

Thompson, D R; Adams, T; Bishop, J M; Cason, N M; Ivanov, E I; LoSecco, J M; Manak, J J; Sanjari, A H; Shephard, W D; Stienike, D L; Taegar, S A ^[1]; Chung, S U; Hackenburg, R W; Olchanski, C; Strassburger, C; Weygand, D P; Willutzki, H J ^[2]; Denisov, S P; Dorofeev, V A; Kachaev, I A ; Lipaev, V V; Popov, A V; Ryabchikov, D I ^[3]; Bar-Yam, Z; Cummings, J P; Dowd, J P; Eugenio, P; Hayek, M; Kern, W; King, E ^[4]; Bodyagin, V A; Kodolova, O L; Korotkikh, V L; Kostin, M A; Ostrovidov, A I; Sarycheva, L I; Sinev, N B; Vardanyan, I N; Yershov, A A ^[5]; Brown, D S; Pedlar, T K; Seth, K K; Wise, J; Zhao, D ^[6]; Adams, G S; Kuhn, J; Napolitano, J; Nozar, M; Smith, J A; White, D B; Witkowski, M ^[7]

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1. University of Notre Dame, Notre Dame, Indiana 46556 (United States)
2. Brookhaven National Laboratory, Upton, Long Island, New York 11973 (United States)
3. Institute for High Energy Physics, Protvino (Russian Federation)
4. University of Massachusetts Dartmouth, North Dartmouth, Massachusetts 02747 (United States)
5. Moscow State University, Moscow (Russian Federation)
6. Northwestern University, Evanston, Illinois 60208 (United States)
7. Rensselaer Polytechnic Institute, Troy, New York 12180 (United States)

The {eta}{pi}{sup {minus}} system has been studied in the reaction {pi}{sup {minus}}p{r_arrow}{eta}{pi}{sup {minus}}p at 18 GeV/c. A large asymmetry in the angular distribution is observed indicating interference between L-even and L-odd partial waves. The a{sub 2}(1320) is observed in the J{sup PC}=2{sup ++} wave, as is a broad enhancement between 1.2 and 1.6 GeV/c{sup 2} in the 1{sup {minus}+} wave. The observed phase difference between these waves shows that there is phase motion in addition to that due to a{sub 2}(1320) decay. The data can be fitted by interference between the a{sub 2}(1320) and an exotic 1{sup {minus}+} resonance with M=(1370{plus_minus}16{sup +50}{sub {minus}30}) MeV/c{sup 2} and {Gamma}=(385{plus_minus}40 {sup +65}{sub {minus}105}) MeV/c{sup 2} . {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 565528
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 9 Vol. 79; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANGULAR DISTRIBUTION
EXOTIC RESONANCES
INTERFERENCE
MESONS
PARTIAL WAVES
PARTICLE PRODUCTION
PROTON-ANTIPROTON INTERACTIONS
QUANTUM CHROMODYNAMICS
QUANTUM NUMBERS
QUARK MODEL