Investigation of the onset of deconfinement with the NA61/SHINE experiment
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arXiv
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866911735777067008 |
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| author | Bazgir, A. |
| author_facet | Bazgir, A. |
| contents | High-energy heavy-ion collisions provide a unique framework for studying the phase transition of strongly interacting matter. The NA61/SHINE experiment, located in the North Area of CERN's SPS, is a fixed-target facility designed to perform a systematic exploration of the QCD phase diagram. This is achieved through a two-dimensional scan that varies both the beam momentum (from 13A to 150/158A GeV/c) and the size of the colliding systems (p+p, p+Pb, Be+Be, Ar+Sc, Xe+La, Pb+Pb, O+O). Such a wide scan enables detailed studies of how collision dynamics evolve with system size and energy. A central objective of the NA61/SHINE research program is to investigate the onset of deconfinement - the transition from hadronic matter to a quark-gluon plasma (QGP) - by analyzing observables such as the strangeness-to-entropy ratio, where entropy is proportional to pion yields. According to the Statistical Model of the Early Stage (SMES), this ratio is expected to exhibit a horn-like structure within the SPS energy range. This article discusses the theoretical framework of the SMES, its assumptions, and compares recent NA61/SHINE results with other experimental data worldwide, contributing to a deeper understanding of the QCD phase transition. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2606_00597 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Investigation of the onset of deconfinement with the NA61/SHINE experiment Bazgir, A. Nuclear Experiment High Energy Physics - Experiment Nuclear Theory High-energy heavy-ion collisions provide a unique framework for studying the phase transition of strongly interacting matter. The NA61/SHINE experiment, located in the North Area of CERN's SPS, is a fixed-target facility designed to perform a systematic exploration of the QCD phase diagram. This is achieved through a two-dimensional scan that varies both the beam momentum (from 13A to 150/158A GeV/c) and the size of the colliding systems (p+p, p+Pb, Be+Be, Ar+Sc, Xe+La, Pb+Pb, O+O). Such a wide scan enables detailed studies of how collision dynamics evolve with system size and energy. A central objective of the NA61/SHINE research program is to investigate the onset of deconfinement - the transition from hadronic matter to a quark-gluon plasma (QGP) - by analyzing observables such as the strangeness-to-entropy ratio, where entropy is proportional to pion yields. According to the Statistical Model of the Early Stage (SMES), this ratio is expected to exhibit a horn-like structure within the SPS energy range. This article discusses the theoretical framework of the SMES, its assumptions, and compares recent NA61/SHINE results with other experimental data worldwide, contributing to a deeper understanding of the QCD phase transition. |
| title | Investigation of the onset of deconfinement with the NA61/SHINE experiment |
| topic | Nuclear Experiment High Energy Physics - Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2606.00597 |