Positron polarization in the decay of polarized N-12: a precision test of the Standard Model

Citation
E. Thomas et al., Positron polarization in the decay of polarized N-12: a precision test of the Standard Model, NUCL PHYS A, 694(3-4), 2001, pp. 559-589
Citations number
63
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
NUCLEAR PHYSICS A
ISSN journal
0375-9474 → ACNP
Volume
694
Issue
3-4
Year of publication
2001
Pages
559 - 589
Database
ISI
SICI code
0375-9474(20011119)694:3-4<559:PPITDO>2.0.ZU;2-M
Abstract
The longitudinal polarization of positrons emitted along and opposite to th e nuclear spin direction has been measured in the decay of polarized N-12. The results are consistent with the Standard Model prediction. In manifest left-right symmetric models this measurement provides a lower bound of 310 GeV/c(2) at 90% CL on the mass of a possible right-handed gauge boson contr ibuting to the electroweak interaction. In generalized versions of this mod el our measurement provides constraints complementary to those set by high- energy experiments. (C) 2001 Elsevier Science B.V. All rights reserved.