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Net-particle number fluctuations in a hydrodynamic description of heavy-ion collisions
Utilizing viscous hydrodynamic simulations of heavy-ion collisions, we study the behavior of cumulants of (net-)(anti)proton number distributions at RHIC beam energy scan energies, incorporating non-critical contributions like baryon conservation and excluded volume. The experimental data on net-proton cumulants at √ S NN > 20 GeV are consistent with simultaneous effects of global baryon conservation and repulsive interactions in baryon sector, whereas the data at lower collision energies show possible indications for sizable attractive interactions among baryons. We discuss the behavior of factorial cumulants in addition to the ordinary cumulants, and also address the quantitative difference between proton and baryon number cumulants.
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NSF-PAR ID:
10333925
Journal Name:
EPJ Web of Conferences
Volume:
259
Page Range or eLocation-ID:
10011
ISSN:
2100-014X
2. A bstract This article presents differential measurements of the asymmetry between $${\varLambda}_b^0$$ Λ b 0 and $${\overline{\varLambda}}_b^0$$ Λ ¯ b 0 baryon production rates in proton-proton collisions at centre-of-mass energies of $$\sqrt{s}$$ s = 7 and 8 TeV collected with the LHCb experiment, corresponding to an integrated luminosity of 3 fb − 1 . The $${\varLambda}_b^0$$ Λ b 0 baryons are reconstructed through the inclusive semileptonic decay $${\varLambda}_b^0$$ Λ b 0 → $${\varLambda}_c^{+}$$ Λ c + μ − $$\overline{\nu}$$ ν ¯ μ X . The production asymmetry is measured both in intervals of rapidity in the range 2 . 15 < y < 4 . 10 and transverse momentum in 2 < p T < 27 GeV/ c . The results are found to be incompatible with symmetric production with a significance of 5.8 standard deviations for both $$\sqrt{s}$$ s = 7 and 8 TeV data, assuming no CP violation in the decay. There is evidence for a trend as a function of rapidity with a significance of 4 standard deviations. Comparisons to predictions from hadronisation models in P ythia and heavy-quark recombination aremore »