Abstract
We report on the measurement of two-pion correlation functions from pp collisions at $\sqrt{s}=900$ GeV performed by the ALICE experiment at the Large Hadron Collider. Our analysis shows an increase of the HBT radius with increasing event multiplicity, in line with other measurements done in particle- and nuclear collisions. Conversely, the strong decrease of the radius with increasing transverse momentum, as observed at RHIC and at Tevatron, is not manifest in our data.
Highlights
Proton-proton collisions have been recorded by ALICE (A Large Ion Collider Experiment) at the Large Hadron Collider (LHC) at CERN [1]
This was further corroborated by the positive correlation between the Hanbury Brown—Twiss (HBT) radius and the multiplicity of the event [6]
The 250 k events used in the analysis were required to have a primary vertex within 10 cm of the center of the 5 m long time projection chamber (TPC) [17]
Summary
Proton-proton collisions have been recorded by ALICE (A Large Ion Collider Experiment) at the Large Hadron Collider (LHC) at CERN [1]. Femtoscopic measurement of bulk collective flow, manifesting itself via dynamical dependences of femtoscopic scales (‘‘homogeneity lengths’’ [11,12]), provided hints that a strongly self-interacting system was created in the collision. This was further corroborated by the positive correlation between the HBT radius and the multiplicity of the event [6]. A systematic program of femtoscopic measurements in pp and heavy-ion collisions at the LHC will shed considerable light on the nature, the similarities, and the differences of their dynamics.
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