First measurement of antideuteron number fluctuations at energies available at the Large Hadron Collider

Abstract

The first measurement of event-by-event antideuteron number fluctuations in high energy heavy-ion collisions is presented. The measurements are carried out at midrapidity ($|\eta |<0.8$) as a function of collision centrality in Pb$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV using the ALICE detector. A significant negative correlation between the produced antiprotons and antideuterons is observed in all collision centralities. The results are compared with a state-of-the-art coalescence calculation. While it describes the ratio of higher order cumulants of the antideuteron multiplicity distribution, it fails to describe quantitatively the magnitude of the correlation between antiproton and antideuteron production. On the other hand, thermal-statistical model calculations describe all the measured observables within uncertainties only for correlation volumes that are different with respect to those describing proton yields and a similar measurement of net-proton number fluctuations.

16 pages, 3 captioned figures, authors from page 11, published version, figures at http://alice-publications.web.cern.ch/node/7844

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Cited by in corpus (10)

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• Study of the deuterons emission time in pp collisions at the LHC via kaon-deuteron correlations
• Measurement of the low-energy antitriton inelastic cross section
• Femtoscopic study of the proton-proton and proton-deuteron systems in heavy-ion collisions at the LHC
• Probing strangeness hadronization with event-by-event production of multistrange hadrons
• Measurement of (anti)alpha production in central Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• ToMCCA: A Toy Monte Carlo Coalescence Afterburner
• Accessing the deuteron source with pion-deuteron femtoscopy in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV