Measurement of the branching ratio of pi^0 -> e^+e^- using K_L -> 3 pi^0 decays in flight
| dc.creator | KTeV Collaboration | |
| dc.date | 1999-03-09 | |
| dc.date | 1999-08-04 | |
| dc.date.accessioned | 2026-07-07T10:32:22Z | |
| dc.date.available | 2026-07-07T10:32:22Z | |
| dc.description | The branching ratio of the rare decay pi^0 -> e^+e^- has been measured in E799-II, a rare kaon decay experiment using the KTeV detector at Fermilab. The pi^0's were produced in fully-reconstructed K_L -> 3 pi^0 decays in flight. We observed 275 candidate pi^0 -> e^+e^- events, with an expected background of 21.4 +- 6.2 events which includes the contribution from Dalitz decays. We measured BR(pi^0 -> e^+e^-, x>0.95) = (6.09 +- 0.40 +- 0.24) times 10^{-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. | |
| dc.description | New version shortened to PRL length limit. 5 pages, 4 figures. Published in Phys. Rev. Lett | |
| dc.identifier | https://arxiv.org/abs/hep-ex/9903007 | |
| dc.identifier | http://arxiv.org/abs/hep-ex/9903007 | |
| dc.identifier | Phys.Rev.Lett.83:922-925,1999 | |
| dc.identifier | doi:10.1103/PhysRevLett.83.922 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/178732 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Measurement of the branching ratio of pi^0 -> e^+e^- using K_L -> 3 pi^0 decays in flight | |
| dc.type | text |