Search for a common baryon source in high-multiplicity pp collisions at the LHC

Abstract

We report on the measurement of the size of the particle-emitting source from two-baryon correlations with ALICE in high-multiplicity pp collisions at $\sqrt{s}$ = 13 TeV. The source radius is studied with low relative momentum p-p, $\bar{\mathrm{p}}$-$\bar{\mathrm{p}}$, p-$\Lambda$ and $\bar{\mathrm{p}}$-$\bar{\Lambda }$ pairs as a function of the pair transverse mass $m_{\mathrm{T}}$ considering for the first time in a quantitative way the effect of strong resonance decays. After correcting for this effect, the radii extracted for pairs of different particle species agree. This indicates that protons, antiprotons, $\Lambda$, and $\bar{\Lambda }$ originate from the same source. Within the measured $m_{\mathrm{T}}$ range (1.1-2.2) GeV/$c^2$ the invariant radius of this common source varies between 0.85 and 1.3 fm. These results provide a precise reference for studies of the strong hadron-hadron interactions and for the investigation of collective properties in small colliding systems.

24 pages, 5 captioned figures, 1 table, authors from page 19, published version including the corrigendum material, figures at http://alice-publications.web.cern.ch/node/6194

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