Published May 9, 2008
| Version v1
Journal article
Determination of the Parity of the Neutral Pion via Its Four-Electron Decay
Creators
- Abouzaid, E.1
- Blucher, E.1
- Glazov, A.1
- Kessler, R.1
- Monnier, E.1
- Solomey, N.1
- Wah, Y. W.1
- Winstein, B.1
- Winston, R.1
- Worcester, E. T.1
- Arenton, M.2
- Cox, B.2
- Golossanov, A.2
- Ledovskoy, A.2
- Phillips, D. G. II2
- Ronquest, M.2
- Smith, D.2
- Barker, A. R.3
- Niclasen, R.3
- Toale, P. A.3
- and others
- KTeV Collaboration
- 1. Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637 (United States)
- 2. Department of Physics and Institute of Nuclear and Particle Physics, University of Virginia, Charlottesville, Virginia 22901 (United States)
- 3. University of Colorado, Boulder, Colorado 80309 (United States)
Description
We present a new determination of the parity of the neutral pion via the double Dalitz decay π0→e+e-e+e-. Our sample, which consists of 30 511 candidate decays, was collected from KL→π0π0π0 decays in flight at the KTeV-E799 experiment at Fermi National Accelerator Laboratory. We confirm the negative π0 parity and place a limit on scalar contributions to the π0→e+e-e+e- decay amplitude of less than 3.3% assuming CPT conservation. The π0γ*γ* form factor is well described by a momentum-dependent model with a slope parameter fit to the final state phase-space distribution. Additionally, we have measured the branching ratio of this mode to be B(π0→e+e-e+e-)=(3.26±0.18)x10-5
Additional details
Identifiers
- DOI
- 10.1103/PhysRevLett.100.182001;
- arXiv
- arXiv:0802.2064v2;
Publishing Information
- Journal Title
- Physical Review Letters
- Journal Volume
- 100
- Journal Issue
- 18
- Journal Page Range
- p. 182001-182001.5
- ISSN
- 0031-9007
- CODEN
- PRLTAO
INIS
- Country of Publication
- United States
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 40009750
- Subject category
- S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
- Descriptors DEI
- BRANCHING RATIO; DECAY AMPLITUDES; ELECTRONS; FERMILAB ACCELERATOR; FORM FACTORS; PARITY; PARTICLE DECAY; PHASE SPACE; PIONS NEUTRAL; POSITRONS
- Descriptors DEC
- ACCELERATORS; AMPLITUDES; ANTILEPTONS; ANTIMATTER; ANTIPARTICLES; BOSONS; CYCLIC ACCELERATORS; DECAY; DIMENSIONLESS NUMBERS; ELEMENTARY PARTICLES; FERMIONS; HADRONS; LEPTONS; MATHEMATICAL SPACE; MATTER; MESONS; PARTICLE PROPERTIES; PIONS; PSEUDOSCALAR MESONS; SPACE; SYNCHROTRONS; TRANSITION AMPLITUDES
Optional Information
- Notes
- (c) 2008 The American Physical Society
- Collaborations
- KTeV Collaboration