Published August 1999
| Version v1
Journal article
Measurement of the Branching Ratio of π0 → e+ e- Using KL → 3π0 Decays in Flight
Creators
- Cheu, E.1
- Taegar, S.A.1
- Wang, J.1
- Arisaka, K.2
- Jennings, J.2
- Slater, W.2
- Tripathi, A.2
- Kobrak, H.G.3
- Swanson, R.A.3
- Blucher, E.4
- Bown, C.4
- Bright, S.4
- Graham, G.4
- Graham, J.4
- Kessler, R.4
- Monnier, E.4
- Prasad, V.4
- Qiao, C.4
- Quinn, B.4
- Roodman, A.4
- Shawhan, P.S.4
- Solomey, N.4
- Swallow, E.C.4
- Wah, Y.W.4
- Winstein, B.4
- Winston, R.4
- Zimmerman, E.D.4
- Barker, A.R.5
- LaDue, J.5
- Mikelsons, P.5
- Nauenberg, U.5
- Toale, P.A.5
- Wu, J.5
- Swallow, E.C.6
- Bellantoni, L.7
- Ben-David, R.7
- Bock, G.J.7
- Childress, S.7
- Coleman, R.7
- Crisler, M.B.7
- Ford, R.7
- Hsiung, Y.B.7
- Jensen, D.A.7
- McBride, P.L.7
- Nakaya, T.7
- Nguyen, H.7
- O'Dell, V.7
- Pang, M.7
- Pordes, R.7
- Ramberg, E.J.7
- Ray, R.E.7
- Shanahan, P.7
- Tschirhart, R.7
- White, H.B.7
- Whitmore, J.7
- Hanagaki, K.8
- Hidaka, S.8
- Sadamoto, M.8
- Senyo, K.8
- Suzuki, I.8
- Yamanaka, T.8
- Bellavance, A.9
- Corcoran, M.D.9
- Albuquerque, I.F.10
- Averitte, S.10
- Belz, J.10
- Bergman, D.R.10
- Halkiadakis, E.10
- Lath, A.10
- Schnetzer, S.10
- Somalwar, S.V.10
- Stone, R.L.10
- Tesarek, R.J.10
- Thomson, G.B.10
- Arenton, M.11
- Corti, G.11
- Cox, B.11
- Golossanov, A.11
- Hagan, K.11
- Jejer, V.11
- Ledovskoy, A.11
- McManus, A.P.11
- Nelson, K.S.11
- Alavi-Harati, A.
- and others
- 1. University of Arizona, Tucson, Arizona 85721 (United States)
- 2. University of California at Los Angeles, Los Angeles, California 90095 (United States)
- 3. University of California at San Diego, La Jolla, California 92093 (United States)
- 4. The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637 (United States)
- 5. University of Colorado, Boulder, Colorado 80309 (United States)
- 6. Elmhurst College, Elmhurst, Illinois 60126 (United States)
- 7. Fermi National Accelerator Laboratory, Batavia, Illinois 60510 (United States)
- 8. Osaka University, Toyonaka, Osaka 560 (Japan)
- 9. Rice University, Houston, Texas 77005 (United States)
- 10. Rutgers University, Piscataway, New Jersey 08855 (United States)
- 11. The Department of Physics and Institute of Nuclear and Particle Physics, University of Virginia, Charlottesville, Virginia 22901 (United States)
Description
The branching ratio of the rare decay π0→e+e- has been measured in E799-II, a rare kaon decay experiment using the KTeV detector at Fermilab. We observed 275 candidate π0→e+e- events, with an expected background of 21.4±6.2 events which includes the contribution from Dalitz decays. We measured B[π0→e+e-, (me+e-/mπ0)2>0.95]=(6.09± 0.40±0.24)x10-8 , where the first error is statistical and the second systematic. This result is the first significant observation of the excess rate for this decay above the unitarity lower bound. copyright 1999 The American Physical Society
Additional details
Publishing Information
- Journal Title
- Physical Review Letters
- Journal Volume
- 83
- Journal Issue
- 5
- Journal Page Range
- p. 922-925
- ISSN
- 0031-9007
- CODEN
- PRLTAO
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 30051738
- Subject category
- S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
- Descriptors DEI
- BRANCHING RATIO; CHIRAL SYMMETRY; ELECTRONS; LEPTONIC DECAY; PAIR PRODUCTION; PARTICLE DECAY; PERTURBATION THEORY; PIONS NEUTRAL; POSITRONS
- Descriptors DEC
- ANTILEPTONS; ANTIMATTER; ANTIPARTICLES; BASIC INTERACTIONS; BOSONS; DECAY; ELEMENTARY PARTICLES; FERMIONS; HADRONS; INTERACTIONS; LEPTONS; MATTER; MESONS; PARTICLE DECAY; PARTICLE PRODUCTION; PIONS; PSEUDOSCALAR MESONS; SYMMETRY; WEAK INTERACTIONS; WEAK PARTICLE DECAY