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A realistic coalescence model for deuteron production
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abstract
A microscopic understanding of (anti)deuteron production in hadron-hadron collisions is the subject of many experimental and theoretical efforts in nuclear physics. This topic is also very relevant for astrophysics, since the rare production of antinuclei in our Universe could be a doorway to discover new physics. In this work, we describe a new coalescence afterburner for event generators based on the Wigner function formalism and we apply it to the (anti)deuteron case, taking into account a realistic particle emitting source. The model performance is validated using the EPOS and PYTHIA event generators applied to proton-proton collisions at the centre-of-mass energy $\sqrt{s}=$ 13 TeV, triggered for high multiplicity events, and the experimental data measured by ALICE in the same collision system. The model relies on the direct measurement of the particle emitting source carried out by means of nucleon-nucleon femtoscopic correlations in the same collision system and energy. The resulting model is used to predict deuteron differential spectra assuming different deuteron wavefunctions within the Wigner function formalism. The predicted deuteron spectra show a clear sensitivity to the choice of the deuteron wavefunction. The Argonne $v_{18}$ wavefunction provides the best description of the experimental data. This model can now be used to study the production of (anti)deuterons over a wide range of collision energies and be extended to heavier nuclei.
Forward citations
Cited by 5 Pith papers
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Probing (Hyper)Nuclei Wave Functions and Production Mechanisms in $\sqrt{s_{\rm{NN}}}=200$ GeV Isobar Collisions at RHIC
Isobar collision yields of ³_ΛH and light nuclei favor coalescence with non-Gaussian hypertriton wave functions that carry enhanced short-distance d–Λ probability, inconsistent with a Gaussian ansatz tied to the measu...
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Light Antinuclei Coalescence: Femtoscopic Constraints via Neural-Flow Surrogates
A neural-flow emulator of the CECA femtoscopic source, fit to 49 ALICE pp correlation functions, reduces claimed uncertainties on antinuclei coalescence parameters B2 and B3 to a few percent and ~10% respectively.
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Confronting the production mechanisms of nuclei with deuteron and proton-triggered balance functions
PYTHIA and Thermal FIST predict the same proton-deuteron balance scaling but differ sharply in its transverse-momentum dependence, so deuteron-triggered balance functions can in principle tell coalescence from statist...
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Toward universal coalescence models for antideuteron production
Event-by-event coalescence models with a shared scale p_coal ≃ 0.2 GeV (or δ ≃ 1.7 fm) simultaneously fit ALICE pp (anti)deuteron spectra and ALEPH Z-decay antideuteron yields.
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Wigner Phase-Space Densities of Nuclear Clusters and Hypernuclei
The authors calculate Wigner phase-space densities for clusters from deuteron to double-Lambda hyperhelium using hyperspherical-harmonic solutions of the Schrödinger equation.
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