Measurement of antideuteron and net-Λ number fluctuations at the Large Hadron Collider
Abstract
The recent measurements of event-by-event correlations between the antideuteron and antiproton numbers in Pb−Pb collisions at the LHC deviate from the statistical hadronization model parameterizations that describe the yields and fluctuations of light-flavored hadrons. This discrepancy may stem from nucleosynthesis processes involved in the formation of composite states like antideuterons. In this letter, we present the first measurement of the antideuteron−net-Λ number correlation obtained in Pb−Pb collisions with the ALICE detector. This quantity is mostly sensitive to the quantum-number correlations induced by the hadronization process, as Λ hyperons are not constituents of antideuterons. Both the antideuteron−net-Λ number correlation and the normalized second-order cumulant of the net-Λ number are well described by the statistical hadronization model implemented in Thermal-FIST. This establishes strong evidence that the antideuteron−antiproton correlation is driven by the nucleosynthesis processes, while the correlation between antideuterons and non-nucleonic hadrons is primarily sensitive to the hadronization mechanism.
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BibTeX
@misc{collaboration2026measurement,
title = {{Measurement of antideuteron and net-$Λ$ number fluctuations at the Large Hadron Collider}},
author = {ALICE Collaboration},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.36307},
eprint = {2610.36307},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.36307},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Measurement of antideuteron and net-Λ number fluctuations at the Large Hadron Collider
AU - ALICE Collaboration
PY - 2026
DA - 2026/10/26
PB - arXiv
DO - 10.48550/arxiv.2610.36307
UR - https://arxiv.org/abs/2610.36307
AB - The recent measurements of event-by-event correlations between the antideuteron and antiproton numbers in Pb−Pb collisions at the LHC deviate from the statistical hadronization model parameterizations that describe the yields and fluctuations of light-flavored hadrons. This discrepancy may stem from nucleosynthesis processes involved in the formation of composite states like antideuterons. In this letter, we present the first measurement of the antideuteron−net-Λ number correlation obtained in Pb−Pb collisions with the ALICE detector. This quantity is mostly sensitive to the quantum-number correlations induced by the hadronization process, as Λ hyperons are not constituents of antideuterons. Both the antideuteron−net-Λ number correlation and the normalized second-order cumulant of the net-Λ number are well described by the statistical hadronization model implemented in Thermal-FIST. This establishes strong evidence that the antideuteron−antiproton correlation is driven by the nucleosynthesis processes, while the correlation between antideuterons and non-nucleonic hadrons is primarily sensitive to the hadronization mechanism.
ER -