Determination of the antiproton-to-electron mass ratio by precision laser spectroscopy of pHe

A femtosecond optical frequency comb and continuous-wave pulse-amplified laser were used to measure 12 transition frequencies of antiprotonic helium to fractional precisions of (9-16)x10(-9). One of these is between two states having microsecond-scale lifetimes hitherto unaccessible to our precision...

Full description

Saved in:
Bibliographic Details
Published in:Physical review letters 2006-06, Vol.96 (24), p.243401-243401
Main Authors: Hori, M, Dax, A, Eades, J, Gomikawa, K, Hayano, R S, Ono, N, Pirkl, W, Widmann, E, Torii, H A, Juhász, B, Barna, D, Horváth, D
Format: Article
Language:English
Subjects:
ANTIPROTONS
COMPARATIVE EVALUATIONS
ELECTRONS
HELIUM IONS
LASER SPECTROSCOPY
LIFETIME
MASS
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
QUANTUM ELECTRODYNAMICS
THREE-BODY PROBLEM
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A femtosecond optical frequency comb and continuous-wave pulse-amplified laser were used to measure 12 transition frequencies of antiprotonic helium to fractional precisions of (9-16)x10(-9). One of these is between two states having microsecond-scale lifetimes hitherto unaccessible to our precision laser spectroscopy method. Comparisons with three-body QED calculations yielded an antiproton-to-electron mass ratio of Mp/me=1836.152674(5).
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.96.243401