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Particle physics

A finer constant

For the first time in a decade, the precision of the fine-structure constant — central to understanding the electromagnetic force — has improved. But even greater accuracy is required to test new physics.

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Figure 1: Approaching alpha.


  1. Gabrielse, G., Hanneke, D., Kinoshita, T., Nio, M. & Odom, B. Phys. Rev. Lett. 97, 030802 (2006).

    Article  ADS  CAS  Google Scholar 

  2. Odom, B., Hanneke, D., D'Urso, B. & Gabrielse, G. Phys. Rev. Lett. 97, 030801 (2006).

    Article  ADS  CAS  Google Scholar 

  3. Schwinberg, P. B., Van Dyck, R. S. Jr & Dehmelt, H. G. Phys. Rev. Lett. 47, 1679–1682 (1981).

    Article  ADS  CAS  Google Scholar 

  4. Peil, S. & Gabrielse, G. Phys. Rev. Lett. 83, 1287–1290 (1999).

    Article  ADS  CAS  Google Scholar 

  5. Bennett, G. W. et al. Phys. Rev. Lett. 92, 161802 (2004).

    Article  ADS  CAS  Google Scholar 

  6. Cladé, P. et al. Phys. Rev. Lett. 96, 033001 (2006).

    Article  ADS  Google Scholar 

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Czarnecki, A. A finer constant. Nature 442, 516–517 (2006).

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