Chatterjee, Sayan (2025) Probing the dynamical evolution of QGP using charge-dependent correlations and fluctuations at CMS. Il nuovo cimento C, 48 (1). pp. 1-5. ISSN 1826-9885
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Abstract
We present the first studies of net-charge fluctuations and charge-balance functions using the broad rapidity coverage of the CMS experiment. These types of event-by-event fluctuations are a powerful tool to characterize the thermo -dynamic properties of the quark-gluon plasma (QGP). The net-charge of the system is a conserved quantity, meaning its fluctuations are sensitive to the QGP formation and phase transition. It therefore provides an understanding of strong interactions complementary to that from the charge -balance function. Relative to past measurements which probed a limited phase space region, we extract fluctuations up to a pseudo-rapidity separation of Δη = 4.8, and as such, significantly improving the sensitivity to test what has been theoretically predicted for the QGP formation. In turn, the width of the balance function, both in relative |η| and relative azimuthal angle, is found to decrease with multiplicity for low particle transverse momentum (pT < 2 GeV/c). The effect is observed for both PbPb and pPb collisions, and it is consistent with a late hadronization scenario, where particles are produced at a later stage during the system evolution. The multiplicity dependence is weaker for higher pT, which signifies that the balancing charge partners are strongly correlated compared to the low-pT region. Model comparisons cannot reproduce the multiplicity dependence of the width in Δη. However, a model which incorporates collective effects can reproduce the narrowing of the width.
| Item Type: | Article |
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| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 24 Mar 2025 15:19 |
| Last Modified: | 24 Mar 2025 15:19 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/23499 |
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