IMPROVED LIMIT ON THE BRANCHING RATIO OF MU-]E CONVERSION ON LEAD

Authors
HONECKER W DOHMEN C HAAN H JUNKER D OTTER G STARLINGER M WINTZ P HOFMANN J BERTL W EGGER J KRAUSE B EGGLI S ENGFER R FINDEISEN C HERMES EA KOZLOWSKI T NIEBUHR CB PRUYS HS VANDERSCHAAF A
Citation
W. Honecker et al., IMPROVED LIMIT ON THE BRANCHING RATIO OF MU-]E CONVERSION ON LEAD, Physical review letters, 76(2), 1996, pp. 200-203
Citations number
22
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
76
Issue
2
Year of publication
1996
Pages
200 - 203
Database
ISI
SICI code
0031-9007(1996)76:2<200:ILOTBR>2.0.ZU;2-P
Abstract
The SINDRUM II spectrometer at Paul Scherrer Institute is used in a se arch for coherent mu --> e conversion in muonic atoms. We report on a measurement on lead, which resulted in Gamma(mu(-)Pb --> e(-)Pb(g.s.)) /Gamma(mu(-)Pb capture) < 4.6 X 10(-11) (90% C.L.). This upper limit i mproves on the previous value by an order of magnitude. Combined with the limit on titanium, it is interpreted in terms of phenomenological couplings between the lepton current and the isoscalar and isovector q uark currents.