Measurement of the direct photon spectrum from the UPSILON(1/ital S/)

Conference · Tue Apr 25 00:00:00 EDT 1989 · AIP Conf. Proc.; (United States)

OSTI ID:6392684

Schutte, J

Using the Crystal Ball detector at the /ital e//sup +//ital e/minus// storage ring DORIS II we have measured the direct photon spectrum from the UPSILON(1/ital S/). Interpreting these photons to come from the decay UPSILON/r arrow/..gamma../ital gg/ we determine the ratio /ital r/=/sup GAMMA(UPSILON/r arrow/..gamma../ital gg/)//sub GAMMA(UPSILON/r arrow//ital ggg/)/=(2.7+-0.2+-0.4)%.Thisratio /ital r/ is used to deduce the strong coupling constant in the /ital MS/ scheme at/ital Q//sup 2/=(1.5 GeV)/sup 2/ to be ..cap alpha../sub /ital s//=0.25+-0.02+-0.04. While the prediction ofthe shape of the spectrum by R. D. Field fits our data well, the prediction oflowest order QCD can clearly be ruled out.

• Research Organization: Universitat Erlangen/Nunber, D-8520 Erlangen, FRG(DE)
• OSTI ID: 6392684
• Report Number(s): CONF-880862-
• Journal Information: AIP Conf. Proc.; (United States), Vol. 185:1; Conference: BNL workshop on glueballs, hybrids and exotic hadrons, Upton, NY, USA, 29 Aug 1988
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
UPSILON-9460 MESONS
RADIATIVE DECAY
COUPLING CONSTANTS
DORIS STORAGE RING
ELECTRON-POSITRON INTERACTIONS
EXPERIMENTAL DATA
GAMMA SPECTRA
GLUONS
PARTICLE WIDTHS
STRONG INTERACTIONS
BASIC INTERACTIONS
BOSONS
BOTTOMONIUM
DATA
ELEMENTARY PARTICLES
HADRONS
INFORMATION
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
MESONS
NUMERICAL DATA
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
POSTULATED PARTICLES
QUARKONIUM
SPECTRA
STORAGE RINGS
VECTOR MESONS
645101* - High Energy Physics- Particle Interactions & Properties-Experimental- Electromagnetic Interactions & Properties