ALICE reports the first simultaneous multiplicity and m_T dependence of the femtoscopic source radius in pp collisions at 13.6 TeV, extracted assuming nucleon-nucleon interaction models and showing different multiplicity dependence than in Pb-Pb collisions.
Pion, kaon, and proton femtoscopy in Pb--Pb collisions at $\sqrt{s_{\rm NN}}$=2.76 TeV modeled in 3+1D hydrodynamics
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abstract
Femtoscopy is providing information on system size and its dynamics in heavy-ion collisions. At ultra-relativistic energies, such as those obtained at the LHC, significant production of pions, kaons and protons enables femtoscopic measurements for these particles. In particular the dependence of system size on pair momentum and particle type is interpreted as evidence for strong collective flow. Such phenomena are naturally modeled by hydrodynamics. We present calculations within the 3+1D hydrodynamic model coupled to statistical hadronization code THERMINATOR 2, corresponding to Pb--Pb collisions at $\sqrt{s_{\rm NN}}=$2.76 TeV. We obtain femtoscopic radii for pions, kaons, and protons, as a function of pair transverse momentum and collision centrality. We find that an approximate universal scaling of radii with pair transverse mass and final state event multiplicity is observed, and discuss the consequences for the interpretation of experimental measurements.
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2026 2representative citing papers
EPOS3 simulations of 200 GeV Au+Au collisions find no clear transverse-mass scaling of Lévy scale parameters across pions, kaons and protons, with proton power-law exponents higher than those for mesons.
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Multiplicity dependence of the size of the common hadron emission source in pp collisions at the LHC
ALICE reports the first simultaneous multiplicity and m_T dependence of the femtoscopic source radius in pp collisions at 13.6 TeV, extracted assuming nucleon-nucleon interaction models and showing different multiplicity dependence than in Pb-Pb collisions.
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Particle species dependence of femtoscopic source parameters in high-energy nuclear collisions
EPOS3 simulations of 200 GeV Au+Au collisions find no clear transverse-mass scaling of Lévy scale parameters across pions, kaons and protons, with proton power-law exponents higher than those for mesons.