Neutral mesons decaying into 4. pi. /sup 0/

Journal Article · Fri Apr 01 04:00:00 EST 1988 · Sov. J. Nucl. Phys. (Engl. Transl.); (United States)

OSTI ID:7086500

Alde, D; Binon, F; Bricman, C; Gouanere, M; Donskov, S V; Inyakin, A V

Decays of mesons into 4..pi../sup 0/ mesons have been studied with the purpose of searching for glueballs, decay of which by this channel should be enhanced in comparison with ordinary qq-bar mesons. The experiment (NA12) was carried out with high statistical accuracy in the SPS accelerator at CERN. The multiphoton spectrometer GAMS-4000 was used for detection of the eight ..gamma.. rays from decay of ..pi../sup 0/ mesons. A new meson X(1810) with spin-parity J/sup P//sup C/ = 2/sup + +/, a possible tensor glueball with mass 1806 +- 10 MeV and width 190 +- 20 MeV, produced with a cross section sigma(..pi../sup -/p..-->..Xn)xBR(X..-->..4..pi../sup 0/) = 8 +- 2 nb, was observed. Its decay by the 2..pi../sup 0/ channel is suppressed: 2..pi../sup 0//4..pi../sup 0/<1/4. In the mass spectrum of 4..pi../sup 0/ systems the G(1590) meson, which is a probable scalar glueball, was observed. The measured value BR(G..-->..4..pi../sup 0/)/BR(G..-->..etaeta) = 0.8 +- 0.3 confirms the existence in it of a strong gluon component. The rare decay f(1270)..-->..4..pi../sup 0/, BR( f..-->..4..pi../sup 0/) = (3 +- 1)x10/sup -3/ was observed.

• Research Organization: Kazakh State University
• OSTI ID: 7086500
• Journal Information: Sov. J. Nucl. Phys. (Engl. Transl.); (United States), Journal Name: Sov. J. Nucl. Phys. (Engl. Transl.); (United States) Vol. 47:4; ISSN SJNCA
• Country of Publication: United States
• Language: English

Related Subjects

645103* -- High Energy Physics-- Particle Interactions &amp; Properties-Experimental-- Strong Interactions &amp; Baryon &amp; Meson Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
COINCIDENCE METHODS
COUNTING TECHNIQUES
DATA
DECAY
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
GAMMA SPECTRA
GLUEBALLS
HADRONIC PARTICLE DECAY
HADRONS
INFORMATION
MESONS
NEUTRAL PARTICLES
NUMERICAL DATA
PARTICLE DECAY
PARTICLES
PIONS
PIONS NEUTRAL
PSEUDOSCALAR MESONS
SPECTRA