Observation of three P states in the radiative decay of UPSILON(2S)

Journal Article · Mon May 20 04:00:00 EDT 1985 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.54.2195· OSTI ID:5603496

Nernst, R; Antreasyan, D; Aschman, D; Besset, D; Bienlein, J K; Bloom, E D; Brock, I; Cabenda, R; Cartacci, A; Cavalli-Sforza, M

The inclusive photon spectrum in hadronic decays of the UPSILON(2S) is measured with the Crystal Ball detector at DORIS II. Four well separated photon lines, which are consistent with the decay hypothesis UPSILON(2S)..--> gamma..+ /sup 3/P/sub 2,1,0/ and /sup 3/P/sub 2,1/..--> gamma..+UPSILON(1S), are observed. The energies of the lines from the primary transitions are E/sub gamma1/ = 110.4 +- 0.8 +- 2.2 MeV, E/sub gamma2/ = 130.6 +- 0.8 +- 2.4 MeV and E/sub gamma3/ = 163.8 +- 1.6 +- 2.7 MeV; the branching fractions are (5.8 +- 0.7 +- 1.0)%, (6.5 +- 0.7 +- 1.2)%, and (3.6 +- 0.8 +- 0.9)%, respectively. The secondary transitions center at approx. =430 MeV with a combined branching fraction of (3.6 +- 0.7 +- 0.5)%.

• Research Organization: California Institute of Technology, Pasadena, California; University of Cape Town, South Africa; Carnegie-Mellon University, Pittsburgh, Pennsylvania; Cracow Institute of Nuclear Physics, Cracow, Poland; Deutsches Elektronen Synchrotron DESY, Hamburg, Germany; Universitat Erlangen-Nuernberg
• DOE Contract Number: AC03-81ER40050; AC02-76ER03066; AC02-76ER03064; AC02-76ER03072
• OSTI ID: 5603496
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 54:20; ISSN PRLTA
• Country of Publication: United States
• Language: English

Related Subjects

645101* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
645400 -- High Energy Physics-- Field Theory
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
BRANCHING RATIO
DORIS STORAGE RING
E1-TRANSITIONS
ELECTRODYNAMICS
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
ENERGY SPECTRA
ENERGY-LEVEL TRANSITIONS
FIELD THEORIES
HADRONS
INCLUSIVE INTERACTIONS
INTERACTIONS
MASSLESS PARTICLES
MESON RESONANCES
MESONS
MEV RANGE
MEV RANGE 100-1000
MULTIPOLE TRANSITIONS
P STATES
PARTICLE INTERACTIONS
PHOTONS
QUANTUM ELECTRODYNAMICS
QUANTUM FIELD THEORY
RADIATIVE DECAY
RESONANCE PARTICLES
SPECTRA
STORAGE RINGS
UPSILON RESONANCES
UPSILON-10000 RESONANCES