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

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Summary

Introduction

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].

The ALICE detector
Data sample
Raw yield extraction
Efficiency and acceptance correction
Subtraction of secondary deuterons
Systematic uncertainties
Results and discussion
N ev d2N dp dy
Conclusions
Full Text
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