Citation
M. Daum et al., SEARCH FOR A NEUTRAL PARTICLE OF MASS 33.9 MEV IN PION DECAY, Physics letters. Section B, 361(1-4), 1995, pp. 179-183
Citations number
9
Categorie Soggetti
Physics
Journal title
ISSN journal
03702693
Volume
361
Issue
1-4
Year of publication
1995
Pages
179 - 183
Database
ISI
SICI code
0370-2693(1995)361:1-4<179:SFANPO>2.0.ZU;2-R
Abstract
We have measured the muon momentum distribution in charged pion decay
in flight in order to search for a small branching fraction eta of pio
n decays pi(+) --> mu(+) + X, in which a heavy neutral particle X with
a mass of 33.9 MeV would be emitted. The upper limit of eta at a conf
idence level of 95% is found to be 2.6 x 10(-8).