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Gelphman, D.; Bloom, E.D.; Clare, R.; Cooper, S.; Gaiser, J.; Godfrey, G.; Hofstadter, R.; Kirkbride, I.; Lee, R.; Leffler, S.; Litke, A.M.; Lockman, W.; Lowe, S.; Matsui, T.; Niczyporuk, B.; Pollock, B.; Schwarz, A.; Tompkins, J.; Wacker, K.; Lurz, B.; Folger, G.; Volland, U.; Wegener, H.; Antreasyan, D.; Irion, J.; Strauch, K.; Williams, D.; Aschman, D.; Besset, D.; Cabenda, R.; Cavelli-Sforza, M.; Cowan, R.; Coyne, D.; Newman-Holmes, C.; Brock, I.; Engler, A.; Kraemer, R.W.; Marlow, D.; Messing, F.; Prindle, D.; Renger, B.; Rippich, C.; Trost, H.J.; Vogel, H.; Cartacci, A.; Conforto, G.; Monteleoni, B.; Pelfer, P.G.; Fridman, A.; Heimlich, F.H.; Lekebusch, R.; Lezoch, P.; Maschmann, W.; Nernst, R.; Sievers, D.; Strohbusch, U.; Jakubowski, Z.; Nowak, G.; Koenig, A.C.; Metzger, W.J.; Schotanus, J.; Walle, R.T. van de; Walk, W.
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany, F.R.); CRYSTAL BALL Collaboration1985
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany, F.R.); CRYSTAL BALL Collaboration1985
AbstractAbstract
[en] We have investigated the hadronic transitions Y(2S)->π0π0Y(1S)->γγγγl+l+ (l=μ or e) and Y(2S)->π+π-Y(1S)->π+π-e+e- using the Crystal Ball detector at the DORIS II e+e- storage ring. Using the present world average value of Bsub(μ)(Y(1S))=(2.9+-0.3)% we derive branching ratios B(Y(2S)->π0π0 Y(1S))=(8.0+-1.5)% and B(Y(2S)->π+π-Y(1S))=(16.9+-4.0)%. We also present results on the invariant mass spectra and the angular distributions of the di-pion system. (orig.)
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Mar 1985; 26 p; SLAC-PUB--3563; CONTRACT DE-AC03-76SF00515
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Report
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Numerical Data
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ANGULAR DISTRIBUTION, ANNIHILATION, BRANCHING RATIO, EFFECTIVE MASS, ELECTRON-POSITRON INTERACTIONS, ELECTRONS, EXPERIMENTAL DATA, GEV RANGE 10-100, HADRONIC PARTICLE DECAY, LEPTONIC DECAY, MASS SPECTRA, MUONS MINUS, MUONS PLUS, PAIR PRODUCTION, PHOTONS, PIONS MINUS, PIONS NEUTRAL, PIONS PLUS, POSITRONS, RADIATIVE DECAY, SEMILEPTONIC DECAY, UPSILON-10000 RESONANCES, UPSILON-9500 RESONANCES
ANTILEPTONS, ANTIMATTER, ANTIMESONS, ANTIPARTICLES, BASIC INTERACTIONS, BOSONS, DATA, DECAY, DISTRIBUTION, ELEMENTARY PARTICLES, ENERGY RANGE, FERMIONS, GEV RANGE, HADRONS, INFORMATION, INTERACTIONS, LEPTON-LEPTON INTERACTIONS, LEPTONS, MASS, MASSLESS PARTICLES, MATTER, MESON RESONANCES, MESONS, MUONS, NUMERICAL DATA, PARTICLE DECAY, PARTICLE INTERACTIONS, PARTICLE PRODUCTION, PIONS, PSEUDOSCALAR ANTIMESONS, PSEUDOSCALAR MESONS, RESONANCE PARTICLES, SPECTRA, UPSILON RESONANCES, VECTOR MESONS, WEAK INTERACTIONS, WEAK PARTICLE DECAY
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