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

The collaboration
Phys.Lett.B 811 (2020) 135849, 2020.

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, $\bar{\rm{p}}$-$\bar{\rm{p}}$, p-$\Lambda$ and $\bar{\rm{p}}$-$\bar{\Lambda}$ pairs as a function of the pair transverse mass $m_{\rm{T}}$ 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 $m_{\rm{T}}$ 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.

• #### Figure 2 p-p Data

Data from Figure 2.

10.17182/hepdata.98857.v1/t1

Source radius $r_{0}$ as a function of〈$m_{T}$〉for the assumption of a purely Gaussian source. The blue crosses result from fitting...

• #### Figure 2 p-$\Lambda$ Data

Data from Figure 2.

10.17182/hepdata.98857.v1/t2

Source radius $r_{0}$ as a function of〈$m_{T}$〉for the assumption of a purely Gaussian source. The blue crosses result from fitting...

• #### Figure 5 p-p Data

Data from Figure 5.

10.17182/hepdata.98857.v1/t3

Source radius $r_{core}$ as a function of〈$m_{T}$〉for the assumption of a Gaussian source with added resonances. The blue crosses result...

• #### Figure 5 p-$\Lambda$ Data

Data from Figure 5.

10.17182/hepdata.98857.v1/t4

Source radius $r_{core}$ as a function of〈$m_{T}$〉for the assumption of a Gaussian source with added resonances. The blue crosses result...