Examination of scaling of Hanbury-Brown--Twiss radii with charged particle multiplicity

In the light of the recent LHC data on proton-proton and lead-lead collisions we examine the question of the multiplicity scaling of HBT radii in relativistic nuclei and particle interactions. Within the UrQMD transport approach we study a large variety of system sizes at different beam energies and extract the HBT radii. In the calculation, we find a good scaling of the radii as a function of charged particle multiplicity, if the change in the multiplicity is caused by a change of centrality at the same energy. However, the scaling is only approximate when the energy,

\sqrt{s}

, is changed and breaks down when comparing pp to AA reactions.

Note:

11 pages, 4 figures, updated references

25.75.Ag
25.75.Gz
p p: interaction
heavy ion: scattering
lead
charged particle: multiple production
Hanbury-Brown-Twiss effect
multiplicity: scaling
transport theory
quantum molecular dynamics: relativistic

References(0)

Figures(4)

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