Measurement of R at {radical}(s)=10.52 GeV and a study of hadronic transitions in {upsilon}(2S){yields}{upsilon}(1S)
- Purdue University, W. Lafayette, Indiana 47907-1396 (United States)
Using the CLEO II detector at the Cornell Electron Storage Ring, R={sigma}(e{sup +}e{sup -}{yields}hadrons)/{sigma}(e{sup +}e{sup -}{yields}{mu}{sup +}{mu}{sup -}) was measured to be 3.56{+-}0.01{+-}0.07 at {radical}(s)=10.52 GeV. This implies values for the strong coupling constant of {alpha}{sub s}(10.52 GeV)=0.20{+-}0.06, and {alpha}{sub s}(M{sub Z})=0.13{+-}0.03. Using a sample of one-half million {upsilon}(2S) events, the dipion transitions in {upsilon}(2S){yields}{upsilon}(1S) were studied. Branching ratios, dipion invariant mass spectra, and various angular distributions were found to be consistent with current theoretical models. The decays {upsilon}(2S){yields}{upsilon}(1S){eta} and {upsilon}(2S){yields}{upsilon}(1S){pi}{sup 0} were not observed, and upper limits for their branching ratios these decays are given.
- OSTI ID:
- 21199095
- Journal Information:
- AIP Conference Proceedings, Vol. 432, Issue 1; Conference: 7. international conference on hadron spectroscopy, Upton, NY (United States), 25-30 Aug 1997; Other Information: DOI: 10.1063/1.56015; (c) 1998 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
Similar Records
High-statistics study of UPSILON(2S). --> pi. /sup +/. pi. /sup -/UPSILON(1S)
Hadronic transitions {Upsilon}(2S){r_arrow}{Upsilon}(1S)
Related Subjects
ANGULAR DISTRIBUTION
BRANCHING RATIO
CESR STORAGE RING
COUPLING CONSTANTS
ELECTRONS
GEV RANGE
MASS SPECTRA
MULTIPARTICLE SPECTROMETERS
MUONS MINUS
PARTICLE DECAY
PARTICLE IDENTIFICATION
PARTICLE PRODUCTION
PIONS NEUTRAL
POSITRONS
RESONANCE PARTICLES
STRONG INTERACTIONS
UPSILON-10355 MESONS
UPSILON-9460 MESONS