Abstract
The study of (anti-)deuteron production in pp collisions has proven to be a powerful tool to investigate the formation mechanism of loosely bound states in high-energy hadronic collisions. In this paper the production of text {(anti-)deuterons} is studied as a function of the charged particle multiplicity in inelastic pp collisions at sqrt{s}=13 TeV using the ALICE experiment. Thanks to the large number of accumulated minimum bias events, it has been possible to measure (anti-)deuteron production in pp collisions up to the same charged particle multiplicity ({mathrm {d} N_{ch}/mathrm {d} eta } sim 26) as measured in p–Pb collisions at similar centre-of-mass energies. Within the uncertainties, the deuteron yield in pp collisions resembles the one in p–Pb interactions, suggesting a common formation mechanism behind the production of light nuclei in hadronic interactions. In this context the measurements are compared with the expectations of coalescence and statistical hadronisation models (SHM).
Highlights
High-energy collisions at the large hadron collider (LHC)create a suitable environment for the production of lightnuclei
We present the detailed study of the pp multiplicity collisions at d√epse=nde1n3cTeeoVf,(athneti-h)idgehuetsetrocnolplirsoiodnucetinoenrgiyn so far delivered at the LHC
The spectra normalised to inelastic pp collisions (INEL) are included in the data provided with this paper
Summary
Create a suitable environment for the production of light (anti-)nuclei. In ultra-relativistic heavy-ion collisions light (anti-)nuclei are abundantly produced [1,2,3], but in elementary pp collisions their production is lower [1,4,5,6]. The ratio between the pT-integrated yields of deuterons and protons (d/p ratio) in Pb–Pb collisions remains constant as a function of centrality, but rises in pp and p–Pb collisions with increasing multiplicity, reaching the value observed in Pb–Pb [1,8,9]. For p–Pb collisions the freeze-out temperature obtained with SHMs using only light-flavoured particles is constant with multiplicity and its value is similar to that obtained in Pb–Pb collisions [13]. In Pb–Pb collisions the B2 parameter as a function of pT shows an increasing trend, which is usually attributed to the position-momentum correlations caused by radial flow or hard scatterings [17,18] Such an increase of B2 as a funct√ion of pT has been observed in pp collisions at s = 7 TeV [6].
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