Radiative decays of the upsilon (2S) resonance
The Crystal Ball Detector at DORIS II was used to study radiative decays of the upsilon (2S) resonance with more than twice the previously available data. The inclusive photon spectrum of hadronic upsilon (2S) decays and the exclusive channel upsilon (2S) ..-->.. ..gamma gamma.. upsilon (1S) ..-->.. ..gamma gamma.. l/sup +/l/sup -/ were analyzed. In the inclusive spectrum three significant photon lines at energies of E..gamma../sub 1/ = (108.2 +- 0.7 +- 4) MeV, E..gamma../sub 1/ = (127.1 +- 0.8 +- 4) MeV and E..gamma../sub 3/ = (160.0 +- 2.4 +- 4) MeV with branching fractions of (6.0 +- 0.7 +- 0.9)%, (6.6 +- 0.8 +- 1.0)%, (2.6 +- 0.7 +- 0.8)% respectively were measured. The lines are consistent with being transitions from the upsilon (2S) to the /sup 3/P/sub 2/, /sup 3/P/sub 1/ and /sup 3/P/sub 0/ states. In addition a line at E..gamma.. approx. 427 MeV was observed which is interpreted as transitions from the /sup 3/P/sub 2/ /sub 1/ states to the upsilon (1S). 17 references.
- Research Organization:
- Harvard Univ., Cambridge, MA (USA). Dept. of Physics; Stanford Linear Accelerator Center, CA (USA)
- DOE Contract Number:
- AC03-76SF00515; AC02-76ER03064
- OSTI ID:
- 6827322
- Report Number(s):
- SLAC-PUB-3325; CONF-8403121-2; ON: DE84011858
- Country of Publication:
- United States
- Language:
- English
Similar Records
Radiative transitions from the T(2S) resonance
Observation of three P states in the radiative decay of UPSILON(2S)
Measurement of the decay UPSILON(2S). --> pi pi. UPSILON(1S)
Journal Article
·
Mon Oct 15 00:00:00 EDT 1984
· AIP Conf. Proc.; (United States)
·
OSTI ID:6447732
Observation of three P states in the radiative decay of UPSILON(2S)
Journal Article
·
Mon May 20 00:00:00 EDT 1985
· Phys. Rev. Lett.; (United States)
·
OSTI ID:5603496
Measurement of the decay UPSILON(2S). --> pi pi. UPSILON(1S)
Journal Article
·
Sat Nov 30 23:00:00 EST 1985
· Phys. Rev. D; (United States)
·
OSTI ID:6237775
Related Subjects
645101* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
BRANCHING RATIO
DATA
DORIS STORAGE RING
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
GAMMA SPECTRA
HADRONS
INFORMATION
MASSLESS PARTICLES
MEASURING INSTRUMENTS
MESON RESONANCES
MESONS
NAI DETECTORS
NUMERICAL DATA
PHOTONS
RADIATION DETECTORS
RADIATIVE DECAY
RESONANCE PARTICLES
SCINTILLATION COUNTERS
SOLID SCINTILLATION DETECTORS
SPECTRA
STORAGE RINGS
UPSILON RESONANCES
UPSILON-10000 RESONANCES
UPSILON-9500 RESONANCES
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
BRANCHING RATIO
DATA
DORIS STORAGE RING
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
GAMMA SPECTRA
HADRONS
INFORMATION
MASSLESS PARTICLES
MEASURING INSTRUMENTS
MESON RESONANCES
MESONS
NAI DETECTORS
NUMERICAL DATA
PHOTONS
RADIATION DETECTORS
RADIATIVE DECAY
RESONANCE PARTICLES
SCINTILLATION COUNTERS
SOLID SCINTILLATION DETECTORS
SPECTRA
STORAGE RINGS
UPSILON RESONANCES
UPSILON-10000 RESONANCES
UPSILON-9500 RESONANCES