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

页码：389 / 398

页数：10

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