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

摘要

In the light of the recent Large Hadron Collider data on proton-proton and lead-lead collisions, we examine the question of the multiplicity scaling of Hanbury-Brown–Twiss (HBT) radii in relativistic nuclei and particle interactions. Within the Ultrarelativistic Quantum Molecular Dynamics 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, √s, is changed and breaks down when comparing proton-proton to nucleus-nucleus reactions.