E-DECAYS TO ETA-PI-PI IN (P)OVER-BAR-P ANNIHILATION AT REST

被引：61
|
作者：
AMSLER, C
ARMSTRONG, DS
BAKER, CA
BARNETT, BM
BATTY, CJ
BENAYOUN, M
BEUCHERT, K
BIRIEN, P
BLUM, P
BOSSINGHAM, R
BRAUNE, K
BROSE, J
BUGG, DV
CASE, T
COOPER, AR
CRAMER, O
CROWE, KM
DEGENER, T
DIETZ, HP
DJAOSHVILI, N
DOMBROWSKI, SV
DOSER, M
DUNNWEBER, W
ENGELHARDT, D
ENGLERT, M
FAESSLER, MA
GIARRITTA, P
HACKMANN, R
HADDOCK, RP
HEINSIUS, FH
HERZ, M
HESSEY, NP
HIDAS, P
HOLZHAUSSEN, C
ILLINGER, P
JAMNIK, D
KALINOWSKY, H
KALTEYER, B
KAMMLE, B
KIEL, T
KISIEL, J
KLEMPT, E
KOCH, H
KOLO, C
KUNZE, M
LAKATA, M
LANDUA, R
LUDEMANN, J
MATTHAY, H
MCCRADY, R
机构：
[1] UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA
[2] RUHR UNIV BOCHUM, D-44780 BOCHUM, GERMANY
[3] UNIV BONN, D-53115 BONN, GERMANY
[4] ACAD SCI BUDAPEST, H-1525 BUDAPEST, HUNGARY
[5] RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND
[6] CERN, CH-1211 GENEVA, SWITZERLAND
[7] UNIV HAMBURG, D-22761 HAMBURG, GERMANY
[8] UNIV KARLSRUHE, D-76021 KARLSRUHE, GERMANY
[9] UNIV LONDON QUEEN MARY & WESTFIELD COLL, LONDON E1 4NS, ENGLAND
[10] UNIV CALIF LOS ANGELES, LOS ANGELES, CA 90024 USA
[11] UNIV MAINZ, D-55099 MAINZ, GERMANY
[12] UNIV MUNICH, D-80333 MUNICH, GERMANY
[13] CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA
[14] CTR RECH NUCL, F-67037 STRASBOURG, FRANCE
来源：
PHYSICS LETTERS B | 1995年 / 358卷 / 3-4期
关键词：
D O I：
10.1016/0370-2693(95)01040-W
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We have observed the eta pi(+)pi(-) and eta pi(0) pi(0) decay modes of the E meson in ($) over bar pp annihilation at rest into pi(+)pi(-)pi(0) pi(0) eta. The mass and width of the E meson are 1409 +/- 3 and 86 +- 10 MeV. The production and decay branching ratio is B(($) over bar pp --> E pi pi)B(E --> eta pi pi = (3.3 +/- 1.0) x 10(-3). With a spin-parity analysis we determine that J(p) = 0(-). The observation of the eta pi(0) phi(0) decay mode establishes that E is isoscalar (C = + 1). We find that E decays to eta(pi pi)(s) (where (pi pi)(s) is an S-wave dipion) and pi alpha(0)(980)(--> pi eta) with a relative branching ratio of (78 +/- 16)%. Using the K ($) over bar K pi production and decay branching ratio measured earlier we determine that B[E --> $($) over bar$$ KK pi]/B[E --> eta pi pi] = 0.61 +/- 0.19. A comparison with observations in radiative J/psi decays suggests that E and iota/eta(1416) are identical.
引用
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页码：389 / 398
页数：10
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