Searcharxiv⌕ Search
Home/Archive/arXiv

arXiv · 2610.08141

Comparison of pair-source and correlation-function based Lévy analyses in Ar+Sc system at SPS energies

Barnabás Pórfy
View original source ↗Read source document ↗Export metadata ↓

Abstract

Non-Gaussian features in femtoscopic observables have been observed in high-energy collisions, yet their origin remains not fully understood. This study focuses on the phenomenological approach to femtoscopy, going beyond the Gaussian approximation by utilizing Lévy-stable source distributions. Using UrQMD simulations, three-dimensional analyses of pion sources are done in central Ar+Sc collisions, and the extracted parameters are studied as functions of transverse mass and collision energy. This analysis contributes to a hadronic baseline motivated by past and future research work in femtoscopy at the NA61/SHINE experiment. A direct methodological comparison is presented between parameters extracted from the projections of three-dimensional pair-source distribution and those obtained from the three-dimensional correlation function, reconstructed via Fast Fourier Transform.

Explore related subjects

hep-phnucl-th

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Barnabás Pórfy. 2026-10-06. Comparison of pair-source and correlation-function based Lévy analyses in Ar+Sc system at SPS energies. https://arxiv.org/abs/2610.08141

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv2026

Universal Mechanism of Dynamical Memory in Light-Nuclei Formation and Cosmological Bose-Einstein Condensation

We identify a common reduced nonequilibrium structure in light-nuclei formation in heavy-ion collisions and cosmological Bose-Einstein condensation. In the heavy-ion system, eliminating a finite-lived intermediate hadronic sector, represented minimally by the Delta component, generates an exponential memory kernel. In the Fukuyama-Morikawa-Tatekawa (FMT) cosmological system, the localized collapse component is generated from the coherent field and feeds back through the expansion rate, producing the causal sequence rho_phi -> rho_l -> H -> rho_phi. Eliminating this additional dynamical sector likewise generates a history-dependent reduced equation. Although the two memory kernels and their microscopic origins are different, they realize the same generic causal structure: elimination of a dynamically relevant coupled sector leaves a memory of its previous evolution. This defines a reduced-dynamical universality class and gives a time-scale criterion separating approximately Markovian from non-Markovian evolution. As a concrete application, we consider hypertriton formation through direct p+n+Lambda and sequential d+Lambda channels. The direct channel acts as a local source, whereas elimination of the intermediate deuteron sector generates a retarded sequential contribution. We predict that the sequential-to-direct ratio depends on the duration and expansion history of the hadronic stage and increases with effective evolution time when sequential correlations are retained more efficiently. Existing coalescence calculations provide a benchmark in which this ratio changes by about 40% while the total hypertriton abundance changes by only about 20%. More generally, several independent relaxation modes in the eliminated sector generate a multi-scale memory kernel.

hep-ph↗
arXiv2026

Symmetry Nonrestoration in the Pati-Salam Model

We demonstrate that symmetry need not be restored in the Pati-Salam model, so that $SU(2)_L\otimes SU(2)_R\otimes SU(4)_c$ remains broken to the Standard Model group at temperatures above the Pati-Salam symmetry breaking scale. Including the leading finite-temperature corrections, suitable quartic couplings prevent a restoration transition, thereby avoiding the thermal production of 't Hooft-Polyakov monopoles after inflation, even if the reheating temperature is very high. This removes monopole-based constraints on the Pati-Salam symmetry breaking scale.

hep-ph↗
arXiv2026

Muon collider experiments as electron/positron beam sources: case studies of new light-particle searches

At muon colliders, muon decays naturally produce intense electrons and positrons with unique features, namely high energies, high repetition rates, and small intrinsic uncertainties, that are unavailable at existing accelerator facilities. We quantitatively study the feasibility of extracting such particles in two representative future muon collider designs, IMCC and $μ$TRISTAN. Using Monte Carlo simulations with the corresponding design parameters, we study the spatial, angular, and energy distributions of decay electrons and positrons in the curved sections of the collider ring. We find that typical deflections of $0.1-10~\mathrm{mrad}$ can be achieved even for high-energy electrons carrying large energy fractions ($\simeq 0.6 - 1.0$) of the muon beam energy, with the ring bending magnets (or magnets providing an equivalent field) effectively serving as a pre-septum magnet, that partially deflects the beam before the main septum magnet, suggesting that the extraction scheme could be practically feasible. Exploiting the distinct beam properties of IMCC and $μ$TRISTAN, we propose complementary search strategies, missing energy and momentum searches for dark matter at $μ$TRISTAN and visible-decay searches for axion-like particles and light scalars at IMCC, which probe parameter space beyond the reach of current and other proposed experiments.

hep-ph↗