Probing QGP using local charge fluctuations in heavy-ion collisions
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866916958343004160 |
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| author | Parra, Jonathan Poberezhniuk, Roman Koch, Volker Ratti, Claudia Vovchenko, Volodymyr |
| author_facet | Parra, Jonathan Poberezhniuk, Roman Koch, Volker Ratti, Claudia Vovchenko, Volodymyr |
| contents | We revisit the D-measure of event-by-event net-electric charge fluctuations, an idea first introduced over 20 years ago as a potential signature for the presence of quark-gluon plasma (QGP) in heavy-ion collisions. We developed a quantitative framework that incorporates resonance-decay effects, global and local charge conservation, and experimental kinematic cuts. Folding these effects into a formalism of density correlations yields an improved expression for the $D$-measure inside acceptance. We make comparisons with ALICE data for Pb-Pb collisions at $\sqrt{s_{\rm NN}}=2.76$~TeV. We find that a hadron-gas scenario can describe the data only for a very short charge conservation range, while a QGP scenario is in good agreement with the measurement and is relatively insensitive to the charge conservation range. A Bayesian comparison of both scenarios shows moderate evidence for freeze-out of charge fluctuations in the QGP phase. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_16167 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Probing QGP using local charge fluctuations in heavy-ion collisions Parra, Jonathan Poberezhniuk, Roman Koch, Volker Ratti, Claudia Vovchenko, Volodymyr Nuclear Theory High Energy Physics - Phenomenology We revisit the D-measure of event-by-event net-electric charge fluctuations, an idea first introduced over 20 years ago as a potential signature for the presence of quark-gluon plasma (QGP) in heavy-ion collisions. We developed a quantitative framework that incorporates resonance-decay effects, global and local charge conservation, and experimental kinematic cuts. Folding these effects into a formalism of density correlations yields an improved expression for the $D$-measure inside acceptance. We make comparisons with ALICE data for Pb-Pb collisions at $\sqrt{s_{\rm NN}}=2.76$~TeV. We find that a hadron-gas scenario can describe the data only for a very short charge conservation range, while a QGP scenario is in good agreement with the measurement and is relatively insensitive to the charge conservation range. A Bayesian comparison of both scenarios shows moderate evidence for freeze-out of charge fluctuations in the QGP phase. |
| title | Probing QGP using local charge fluctuations in heavy-ion collisions |
| topic | Nuclear Theory High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2509.16167 |