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.
Resolving the HBT Puzzle in Relativistic Heavy Ion Collision
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abstract
Two particle correlation data from the Relativistic Heavy Ion Collider have provided detailed femtoscopic information describing the space-time structure of the emission of pions. This data had avoided description with hydrodynamic-based approaches, in contrast to the success of hydrodynamics in reproducing other classes of observables. This failure has inspired the term ``HBT puzzle'', where HBT refers to femtoscopic studies which were originally based on Hanbury-Brown Twiss interferometry. Here, the puzzle is shown to originate not from a single shortcoming of hydrodynamic models, but the combination of several effects: mainly including pre-thermalized acceleration, using a stiffer equation of state, and adding viscous corrections.
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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.