Published January 1, 2010 | Version v1
Journal article Metadata-only

Precise measurement of HFS of positronium

Creators

  • 1. Department of Physics and ICEPP, the University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033 (Japan)
  • 2. Institute of Physics, the University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo, 153-8902 (Japan)
  • 3. High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki, 305-0801 (Japan)
  • 4. FIR Center, University of Fukui, 3-9-1 Bunkyo, Fukui, 910-8507 (Japan)

Description

The ground state hyperfine splitting in positronium, ΔHFS, is sensitive to high order corrections of QED. A new calculation up to O(α3) has revealed a 3.9 σ discrepancy between the QED prediction and the experimental results. This discrepancy might either be due to systematic problems in the previous experiments or to contributions beyond the Standard Model. We propose an experiment to measure ΔHFS employing new methods designed to remedy the systematic errors which may have affected the previous experiments. Our experiment will provide an independent check of the discrepancy. The measurement is in progress and a preliminary result of ΔHFS = 203.399±0.029 GHz (143 ppm) has been obtained. A measurement with a precision of O(1) ppm is expected within a few years.

Availability note (English)

Available from http://dx.doi.org/10.1088/1742-6596/199/1/012004

Additional details

Identifiers

DOI
10.1088/1742-6596/199/1/012004;

Publishing Information

Journal Title
Journal of Physics. Conference Series (Online)
Journal Volume
199
Journal Issue
1
Journal Page Range
[5 p.]
ISSN
1742-6596

Conference

Title
15. international workshop on low energy positron and positronium physics
Dates
29 Jul - 1 Aug 2009
Place
Toronto (Canada)

INIS

Country of Publication
United Kingdom
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
42062023
Subject category
S74: ATOMIC AND MOLECULAR PHYSICS;
Resource subtype / Literary indicator
Conference
Descriptors DEI
ACCURACY; CORRECTIONS; FORECASTING; GROUND STATES; HYPERFINE STRUCTURE; POSITRONIUM; QUANTUM ELECTRODYNAMICS; STANDARD MODEL
Descriptors DEC
ELECTRODYNAMICS; ENERGY LEVELS; FIELD THEORIES; GRAND UNIFIED THEORY; MATHEMATICAL MODELS; PARTICLE MODELS; QUANTUM FIELD THEORY; UNIFIED GAUGE MODELS