Observation of {eta}{sup '} Decays to {pi}{sup +}{pi}{sup -}{pi}{sup 0} and {pi}{sup +}{pi}{sup -}e{sup +}e{sup -}

Journal Article · Fri Feb 13 04:00:00 EST 2009 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.102.061801· OSTI ID:21180193

Naik, P; Rademacker, J ^[1]; Asner, D M; Edwards, K W; Reed, J; Robichaud, A N; Tatishvili, G ^[2]; Briere, R A; Vogel, H ^[3]; Onyisi, P U. E.; Rosner, J L ^[4]; Alexander, J P; Cassel, D G; Duboscq, J E; Ehrlich, R; Fields, L; Galik, R S; Gibbons, L; Gray, R; Gray, S W ^[5]

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1. University of Bristol, Bristol BS8 1TL (United Kingdom)
2. Carleton University, Ottawa, Ontario, Canada K1S 5B6 (Canada)
3. Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (United States)
4. Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637 (United States)
5. Cornell University, Ithaca, New York 14853 (United States)

Using {psi}(2S){yields}{pi}{sup +}{pi}{sup -}J/{psi}, J/{psi}{yields}{gamma}{eta}{sup '} events acquired with the CLEO-c detector at the CESR e{sup +}e{sup -} collider, we make the first observations of the decays {eta}{sup '}{yields}{pi}{sup +}{pi}{sup -}{pi}{sup 0} and {eta}{sup '}{yields}{pi}{sup +}{pi}{sup -}e{sup +}e{sup -}, measuring absolute branching fractions (37{sub -9}{sup +11}{+-}4)x10{sup -4} and (25{sub -9}{sup +12}{+-}5)x10{sup -4}, respectively. For {eta}{sup '}{yields}{pi}{sup +}{pi}{sup -}{pi}{sup 0}, this result probes the mechanism of isospin violation and the roles of {pi}{sup 0}/{eta}/{eta}{sup '}-mixing and final state rescattering in strong decays. We also set upper limits on branching fractions for {eta}{sup '} decays to {pi}{sup +}{pi}{sup -}{mu}{sup +}{mu}{sup -}, 2({pi}{sup +}{pi}{sup -}), {pi}{sup +}{pi}{sup -}2{pi}{sup 0}, 2({pi}{sup +}{pi}{sup -}){pi}{sup 0}, 3({pi}{sup +}{pi}{sup -}), and invisible final states.

• OSTI ID: 21180193
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 6 Vol. 102; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BRANCHING RATIO
CESR STORAGE RING
ELECTRONS
ETA MESONS
ISOSPIN
J PSI-3097 MESONS
MULTIPARTICLE SPECTROMETERS
MULTIPLE PRODUCTION
MUONS MINUS
MUONS PLUS
PARTICLE DECAY
PARTICLE IDENTIFICATION
PIONS MINUS
PIONS NEUTRAL
PIONS PLUS
POSITRONS
RESCATTERING