Published May 20, 1985 | Version v1
Journal article Metadata-only

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

Creators

  • 1. Universitat Erlangen-Nuernberg
  • 2. Deutsches Elektronen Synchrotron DESY, Hamburg, Germany
  • 3. Cracow Institute of Nuclear Physics, Cracow, Poland
  • 4. Carnegie-Mellon University, Pittsburgh, Pennsylvania
  • 5. University of Cape Town, South Africa
  • 6. California Institute of Technology, Pasadena, California

Description

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)→γ+ 3P/sub 2,1,0/ and 3P/sub 2,1/→γ+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)%

Additional details

Publishing Information

Journal Title
Phys. Rev. Lett.
Journal Volume
54
Journal Issue
20
Series
Phys. Rev. Lett.
Journal Page Range
2195-2198
ISSN
0031-9007
CODEN
PRLTA

INIS

Country of Publication
United States
Country of Input or Organization
United States
INIS RN
17001208
Subject category
S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; S71: CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS;
Descriptors DEI
BRANCHING RATIO; DORIS STORAGE RING; ENERGY SPECTRA; E1-TRANSITIONS; INCLUSIVE INTERACTIONS; MEV RANGE 100-1000; P STATES; PHOTONS; QUANTUM ELECTRODYNAMICS; RADIATIVE DECAY; UPSILON-10000 RESONANCES
Descriptors DEC
BOSONS; DECAY; ELECTRODYNAMICS; ELEMENTARY PARTICLES; ENERGY LEVELS; ENERGY RANGE; ENERGY-LEVEL TRANSITIONS; FIELD THEORIES; HADRONS; INTERACTIONS; MASSLESS PARTICLES; MESON RESONANCES; MESONS; MEV RANGE; MULTIPOLE TRANSITIONS; PARTICLE DECAY; PARTICLE INTERACTIONS; QUANTUM FIELD THEORY; RESONANCE PARTICLES; SPECTRA; STORAGE RINGS; UPSILON RESONANCES; VECTOR MESONS