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Novel method for identifying the heaviest QED atom.

Jing-Hang Fu1, Sen Jia2, Xing-Yu Zhou3

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|April 19, 2024
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Researchers propose detecting the tau-lepton (τ) pair QED atom, the Jτ, using electron-positron collisions. This discovery could enable precise tau lepton mass measurements, advancing particle physics research.

Keywords:
annihilationQED atomSCTFSTCFTau lepton

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Area of Science:

  • Particle Physics
  • Quantum Electrodynamics (QED)
  • Atomic Physics

Background:

  • QED atoms are exotic particles formed by lepton pairs bound by electromagnetic forces.
  • The tau-lepton (τ) pair forms the heaviest and smallest QED atom, known as the Jτ.
  • Currently, only electron-positron (e+e-) and muon-electron (μ+e-) atoms are known, discovered 64 years ago.

Purpose of the Study:

  • To demonstrate the observable signal of the Jτ (τ+τ- atom with JPC=1--) atom.
  • To achieve a significance greater than 5σ for the Jτ signal detection.
  • To measure the τ lepton mass with high precision.

Main Methods:

  • Analyzing data from e+e- collisions producing X+Y- pairs (where X,Y can be e, μ, π, K, or ρ) with missing energy (Ɇ) due to neutrinos.
  • Utilizing 1.5 ab⁻¹ of data collected near the τ pair production threshold.
  • Employing statistical and systematic uncertainty analysis.

Main Results:

  • The Jτ atom signal can be observed with a significance exceeding 5σ.
  • The τ lepton mass can be measured with a precision of 1 keV.
  • Detection is feasible within one year at proposed super tau-charm facilities.

Conclusions:

  • The Jτ atom signal is detectable with current and near-future experimental capabilities.
  • Precise τ lepton mass measurement will be possible, refining our understanding of fundamental particles.
  • This research opens new avenues for exploring QED atoms and fundamental physics.