ITA
ENG

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

Authors

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 MERLO JP MEYER CA MONTANET L NOBLE A OUARED R OULDSAADA F PETERS K PINDER CN PINTER G RAVNDAL S REGENFUS C SCHAFER E SCHMIDT P SCHUTRUMPF M SCOTT I SEIBERT R SPANIER S STOCK H STRASSBURGER C STROHBUSCH U SUFFERT M THOMA U TISCHHAUSER M URNER D VOLCKER C WALTER F WALTHER D WIEDNER U WINTER N ZOLL J

Citation

C. Amsler et al., E-DECAYS TO ETA-PI-PI IN (P)OVER-BAR-P ANNIHILATION AT REST, Physics letters. Section B, 358(3-4), 1995, pp. 389-398

Citations number

Categorie Soggetti

Physics

Journal title

Physics letters. Section B → ACNP

ISSN journal

03702693

Volume

358

Issue

3-4

Year of publication

1995

Pages

389 - 398

Database

ISI

SICI code

0370-2693(1995)358:3-4<389:ETEI(A>2.0.ZU;2-U

Abstract

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 spi n-parity analysis we determine that J(p) = 0(-). The observation of th e 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-wa ve 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 de cay branching ratio measured earlier we determine that B[E --> $($) ov er 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(14 16) are identical.