EXOTIC ETA-PI STATE IN (P)OVER-BAR-D ANNIHILATION AT REST INTO PI(-)PI(0)ETA P(SPECTATOR)

Authors
ABELE A ADOMEIT J AMSLER C BAKER CA BARNETT BM BATTY CJ BENAYOUN M BERDOZ A BEUCHERT K BISCHOFF S BLUM P BRAUNE K BUGG DV CASE T CRAMER O CREDE V CROWE KM DEGENER T DJAOSHVILI N VONDOMBROWSKI S DOSER M DUNNWEBER W EHMANNS A ENGELHARDT D FAESSLER MA GIARRITTA P HADDOCK RP HEINSIUS FH HEINZELMANN M HERBSTRITH A HERZ M HESSEY NP HIDAS P HODD C HOLTZHAUSSEN C HUTTMANN K JAMNIK D KALINOWSKY H KAMMLE B KAMMEL P KISIEL J KLEMPT E KOCH H KOLO C KUNZE M KURILLA U LAKATA M LANDUA R MATTHAY H MCCRADY R MEIER J MEYER CA MONTANET L OUARED R OULDSAADA F PETERS K PICK B PIETRA C PINDER CN RATAJCZAK M REGENFUS C RESAG S ROETHEL W SCHMIDT P SCOTT I SEIBERT R SPANIER S STOCK H STRASSBURGER C STROHBUSCH U SUFFERT M THOMA U TISCHHAUSER M VOLCKER C WALLIS S WALTHER D WIEDNER U WITTMACK K ZOU BS ZUPANCIC C
Citation
A. Abele et al., EXOTIC ETA-PI STATE IN (P)OVER-BAR-D ANNIHILATION AT REST INTO PI(-)PI(0)ETA P(SPECTATOR), Physics letters. Section B, 423(1-2), 1998, pp. 175-184
Citations number
34
Categorie Soggetti
Physics
Journal title
Physics letters. Section B → ACNP
ISSN journal
03702693
Volume
423
Issue
1-2
Year of publication
1998
Pages
175 - 184
Database
ISI
SICI code
0370-2693(1998)423:1-2<175:EESI(A>2.0.ZU;2-A
Abstract
With antiprotons slopped in liquid deuterium, the <(p)over bar n> anni hilation channel pi(-)pi(0) eta was studied using a final sample of 52 576 events obtained for a spectator proton momentum < 100 MeV/c. In t he intensity distribution the eta pi P-wave is clearly apparent by its interferences with the dominant rho(-)(770) rind a(2)(1310) two-meson resonances. A partial wave analysis of the data yields evidence for r esonant behaviour of the eta pi P-wave, which has the non-<q(q)over ba r> quantum numbers I-G = 1(-), J(PC) = 1(-+). The extracted Breit-Wign er resonance parameters are m = (1400 +/- 20 +/- 20) MeV/c(2) and Gamm a = (310 +/- 50(-30)(+50)) MeV/c(2). (C) 1998 Published by Elsevier Sc ience B.V.