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Setting Limits on Supersymmetry Using Simplified Models
07:46

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Published on: November 15, 2013

Why three-body physics does not solve the proton-radius puzzle.

Jean-Philippe Karr1, Laurent Hilico

  • 1Laboratoire Kastler Brossel, UPMC-Paris 6, ENS, CNRS, Paris, France. karr@spectro.jussieu.fr

Physical Review Letters
|September 26, 2012
PubMed
Summary
This summary is machine-generated.

Weakly bound three-body systems were investigated for their role in muonic hydrogen spectroscopy. The pμe ion and ppμ molecular ion were found not to explain the proton radius discrepancy.

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Area of Science:

  • Atomic Physics
  • Quantum Chemistry
  • Nuclear Physics

Background:

  • A significant discrepancy exists in proton radius measurements between muonic hydrogen spectroscopy and electron-based experiments.
  • Weakly bound three-body systems have been proposed as a potential explanation for this proton radius puzzle.

Purpose of the Study:

  • To investigate the role of the pμe ion and ppμ molecular ion in muonic hydrogen spectroscopy.
  • To determine if these systems can account for the observed proton radius discrepancy.

Main Methods:

  • Variational calculations were employed.
  • Complex coordinate rotation was utilized to study the properties of the proposed systems.

Main Results:

  • The pμe ion was found to be insufficient; the pμ core does not bind the outer electron strongly enough to explain the discrepancy.
  • The ppμ molecular ion was ruled out as a contributor to the observed spectral lines.

Conclusions:

  • The investigated three-body systems, pμe and ppμ, do not resolve the proton radius discrepancy in muonic hydrogen spectroscopy.
  • Alternative explanations for the proton radius puzzle need to be explored.