The dependence of the emission size on the hadron mass

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Abstract

The size of the emission volume of pions and kaons, rππ and rKK, were measured in the hadronic Z0 decays through the two-pion and two-kaon Bose-Einstein correlations near threshold. Recently the emitter size of the two identical baryons, ΛΛ(Λ + ̄Λ + ̄), was evaluated from the dependence of the fraction of the spin S = 1 state on the energy near threshold where it is affected by the Pauli exclusion principle. Here we show that the r dependence on the particle masses, namely the hierarchy rππ> rKK > rΛΛ observed in the Z0 hadronic decays, is well described in terms of the Heisenberg uncertainty principle. A good description can also be obtained via the virial theorem when applied to a general QCD potential. Other available approaches are also discussed.

Original languageEnglish
Pages (from-to)159-166
Number of pages8
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume452
Issue number1-2
DOIs
StatePublished - 1999

Keywords

  • Bose and Fermi correlations
  • Emission radius
  • Hadron mass
  • QCD
  • Uncertainty principle

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