Radiative transitions from the T(2S) resonance

Journal Article · Mon Oct 15 04:00:00 EDT 1984 · AIP Conf. Proc.; (United States)

DOI:https://doi.org/10.1063/1.34796· OSTI ID:6447732

Antreasyan, D

Preliminary results from the Crystal Ball experiment at DORIS II are presented on the radiative transitions from the UPSILON(2S) resonance. Three photon lines are observed in the inclusive photon spectrum of UPSILON(2S) resonance decays, at energies of 108.2 +- 0.7, 127.1 +- 0.8 and 160.0 +- 2.4 MeV, with an estimated systematic error of +- 4 MeV. The branching ratios are measured to be (6.0 +- 0.7)%, (6.6 +- 0,8)% and (2.6 +- 0.7)% respectively. The two lower energy photon lines are also observed in the exclusive channel UPSILON(2S)..--> gamma gamma..l l/sup -/, consistent with the hypothesis that they correspond to the radiative transitions from UPSILON(2S) to the 3P/sub 2,1,0/ states of bb-bar.

• Research Organization: Harvard University, Cambridge, MA 02138)
• OSTI ID: 6447732
• Journal Information: AIP Conf. Proc.; (United States), Journal Name: AIP Conf. Proc.; (United States) Vol. 121:1; ISSN APCPC
• Country of Publication: United States
• Language: English

Related Subjects

645101* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
645102 -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
ANNIHILATION
BASIC INTERACTIONS
BOSONS
BRANCHING RATIO
DECAY
DISTRIBUTION
DORIS STORAGE RING
ELECTROMAGNETIC INTERACTIONS
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
ENERGY SPECTRA
FERMIONS
FIELD THEORIES
GAMMA SPECTRA
HADRONS
INCLUSIVE INTERACTIONS
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LEPTONS
MASS SPECTRA
MASSLESS PARTICLES
MESON RESONANCES
MESONS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PERTURBATION THEORY
PHOTONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARKONIUM
RESONANCE PARTICLES
SPECTRA
SPIN
STORAGE RINGS
UPSILON RESONANCES