Measurement of the transverse polarization of positrons from the decay of polarized muons: A status report

Citation
K. Bodek et al., Measurement of the transverse polarization of positrons from the decay of polarized muons: A status report, NUCL PHYS A, 663, 2000, pp. 907C-910C
Citations number
4
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
NUCLEAR PHYSICS A
ISSN journal
0375-9474 → ACNP
Volume
663
Year of publication
2000
Pages
907C - 910C
Database
ISI
SICI code
0375-9474(20000131)663:<907C:MOTTPO>2.0.ZU;2-T
Abstract
A new experiment [1] to measure both transverse components of the positron polarization from the decay of polarized muons starts data taking at PSI in Switzerland. The experiment aims at an accuracy of Delta P-T1 = Delta P-T2 = 3 x 10(-3) and by that at an improvement of the existing limit by nearly one order of magnitude. These results will be sensitive tests for the cont ribution of exotic couplings to muon decay. In particular, the measurement of P-T1 allows the extraction of the so-called low energy Michel parameter eta, the accuracy of which presently limits a more precise model independen t determination of the Fermi coupling constant Gr. The measurement of P-T1 is at present the only possibility to best time reversal invariance in a pu rely leptonic reaction. The physics motivation is discussed together with a description of the experimental setup and results from test measurements.