The dependence of the emission size on the hadron mass

Details The dependence of the emission size on the hadron mass The dependence of the emission size on the hadron mass

1999-01-18

arxiv.org/abs/hep-ph/9901341v3

Phys.Lett.B452:159-166,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 3 figures

Scientific paper

10.1016/S0370-2693(99)00257-9

The size of the emission volume of pions and kaons, r_{\pi\pi} and r_{KK}, were measured in the hadronic Z^0 decays through the two-pion and two-kaon Bose-Einstein correlations near threshold. Recently the emitter size of the two identical baryons, \Lambda \Lambda (\bar \Lambda \bar \Lambda), 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 r_{\pi\pi} > r_{KK} > r_{\Lambda \Lambda} observed in the Z^0 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.

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