Measurement of the decay UPSILON(2S). --> pi pi. UPSILON(1S)

Journal Article · Sun Dec 01 04:00:00 EST 1985 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.32.2893· OSTI ID:6237775

Gelphman, D; Lurz, B; Antreasyan, D; Aschman, D; Besset, D; Bienlein, J K; Bloom, E D; Brock, I; Cabenda, R; Cartacci, A

We have investigated the hadronic transitions UPSILON(2S) ..-->.. ..pi../sup 0/..pi../sup 0/UPSILON(1S) ..-->.. ..gamma gamma gamma gamma..l +l/sup -/ (l = ..mu.. or e) and UPSILON(2S) ..-->.. ..pi../sup +/..pi../sup -/UPSILON(1S) ..-->.. ..pi../sup +/..pi.. /sup -/e/sup +/e/sup -/ using the Crystal Ball detector at the DESY e/sup +/e/sup -/ storage ring DORIS II. Using the present world-average value of B/sub l/l(UPSILON(1S)) = 2.9 +- 0.3)% we derive branching ratios B(UPSILON(2S) ..-->.. ..pi../sup 0/..pi../sup 0/UPSILON(1S)) = (8.0 +- 1.5)% and B(UPSILON(2S) ..-->.. ..pi../sup +/..pi../sup -/UPSILON(1S)) = (16.9 +- 4.0)%. We also present results on the invariant-mass spectra and the angular distributions of the dipion system.

• Research Organization: California Institute of Technology, Pasadena, California 91125
• DOE Contract Number: AC03-81ER40050; AC02-76ER03066; AC02-76ER03064; AC03-76SF00515
• OSTI ID: 6237775
• Journal Information: Phys. Rev. D; (United States), Journal Name: Phys. Rev. D; (United States) Vol. 32:11; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645104* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Meson-Induced Interactions-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR DISTRIBUTION
BHABHA SCATTERING
BOSONS
BOUND STATE
BRANCHING RATIO
DATA
DECAY
DISTRIBUTION
DORIS STORAGE RING
ELASTIC SCATTERING
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
FERMIONS
HADRONIC PARTICLE DECAY
HADRONS
INFORMATION
ISOSPIN
LEPTONS
MASS SPECTRA
MESON RESONANCES
MESONS
MONTE CARLO METHOD
NUMERICAL DATA
PARTICLE DECAY
PARTICLE PROPERTIES
PCAC THEORY
PIONS
PIONS NEUTRAL
PSEUDOSCALAR MESONS
RADIATIVE DECAY
RESONANCE PARTICLES
SCATTERING
SPECTRA
STORAGE RINGS
UPSILON RESONANCES
UPSILON-10000 RESONANCES
UPSILON-9500 RESONANCES