{"paper":{"title":"Two-pion source analysis in small to large systems at SPS energies","arxiv_id":"2610.16786","primary_cat":"hep-ph","submitted_at":"2026-10-12T13:40:22+00:00","version_compiled":"v1"},"notice":"Every quoted sentence is the authors' text from the arXiv listing abstract. Labels and probabilities are the outputs of classifier-1.13.0 on the question bank abstract-p1-20260923, exactly as returned. 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energies.","hedge":{"p":1.0,"label":"asserted"},"own_p":0.04,"main_claim_p":0.01,"quantitative":false,"quantitative_p":0.12,"role_probabilities":{"gap":0.0,"method":0.0,"result":0.0,"background":1.0,"limitation":0.0,"future_work":0.0,"contribution":0.0,"interpretation":0.0}},{"i":2,"p":1.0,"id":"s2","own":true,"role":"contribution","text":"We contribute to this line of work by investigating the shape of two-pion pair-source distributions in central $^7$Be+$^9$Be and $^{129}$Xe+$^{139}$La collisions simulated with the UrQMD model in cascade mode.","hedge":{"p":0.95,"label":"asserted"},"own_p":0.95,"main_claim_p":0.03,"quantitative":false,"quantitative_p":0.29,"role_probabilities":{"gap":0.0,"method":0.0,"result":0.0,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":1.0,"interpretation":0.0}},{"i":3,"p":1.0,"id":"s3","own":true,"role":"method","text":"To make the comparison with measurements meaningful, kinematic selections similar to the experimental ones are applied to the simulated events and particles.","hedge":{"p":0.97,"label":"asserted"},"own_p":0.89,"main_claim_p":0.02,"quantitative":false,"quantitative_p":0.09,"role_probabilities":{"gap":0.0,"method":1.0,"result":0.0,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.0,"interpretation":0.0}},{"i":4,"p":0.99,"id":"s4","own":true,"role":"method","text":"One-dimensional L\\'evy fits are performed, and the resulting source parameters are studied as functions of pair transverse mass, collision energy, and system size.","hedge":{"p":0.73,"label":"asserted"},"own_p":0.95,"main_claim_p":0.04,"quantitative":false,"quantitative_p":0.09,"role_probabilities":{"gap":0.0,"method":0.99,"result":0.0,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.01,"interpretation":0.0}},{"i":5,"p":0.9,"id":"s5","own":true,"role":"result","text":"We find that the simulated sources are well described by L\\'evy distributions in all systems considered, which offers a common phenomenological picture of the space-time structure of pion emission.","hedge":{"p":1.0,"label":"asserted"},"own_p":0.96,"main_claim_p":0.86,"quantitative":false,"quantitative_p":0.1,"role_probabilities":{"gap":0.0,"method":0.0,"result":0.9,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.0,"interpretation":0.1}},{"i":6,"p":0.47,"id":"s6","own":true,"role":"contribution","text":"Finally, we compare our findings with results from an intermediate system, Ar+Sc.","hedge":{"p":0.81,"label":"asserted"},"own_p":0.85,"main_claim_p":0.03,"quantitative":false,"quantitative_p":0.39,"role_probabilities":{"gap":0.0,"method":0.46,"result":0.06,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.47,"interpretation":0.01}},{"i":7,"p":0.88,"id":"s7","own":false,"role":"interpretation","text":"The results serve as a purely hadronic reference for past and upcoming femtoscopic measurements of the NA61/SHINE 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