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Measurements of chemical potentials in Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV

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Figures from paper submitted to Physical Review Letters
Abstract:

This Letter presents the most precise measurement to date of the matter/antimatter imbalance at midrapidity in Pb-Pb collisions at a center-of-mass energy per nucleon pair $\sqrt{s_{\rm NN}} = 5.02$ TeV. Using the Statistical Hadronization framework, it is possible to obtain the value of the electric charge and baryon chemical potentials, $\mu_Q=-0.18\pm0.90$ MeV and $\mu_B=0.71\pm0.45$ MeV, with unprecedented precision. A centrality-differential study of the antiparticle-to-particle yield ratios of charged pions, protons, $\Omega$-baryons, and light (hyper)nuclei is performed. These results indicate that the system created in Pb-Pb collisions at the LHC is on average baryon-free and electrically neutral at midrapidity.

e-Print: arXiv:2311.13332 | PDF | inSPIRE

Paper:

Figure 1
Energy
5.02 TeV
System
Pb-Pb
Scope: PWG
PWG-LF (Light Flavour Spectra)
Figure image (.eps)
fits_32.eps
Figure 2a
Energy
5.02 TeV
System
Pb-Pb
Scope: PWG
PWG-LF (Light Flavour Spectra)
Figure image (.eps)
ellipsePlot_fist_74.eps
Figure image (.pdf)
ellipsePlot_fist_74.pdf
Figure 2b
Energy
5.02 TeV
System
Pb-Pb
Scope: PWG
PWG-LF (Light Flavour Spectra)
Figure image (.eps)
muBvsSqrtS_0.eps
Figure image (.pdf)
muBvsSqrtS_0.pdf
Figure A.1a
Energy
5.02 TeV
System
Pb-Pb
Scope: PWG
PWG-LF (Light Flavour Spectra)
Figure image (.eps)
RatioRun2_omega_0.eps
Figure image (.pdf)
RatioRun2_omega_0.pdf
Figure A.1b
Energy
5.02 TeV
System
Pb-Pb
Scope: PWG
PWG-LF (Light Flavour Spectra)
Figure image (.eps)
RatioRun2_pion_0.eps
Figure image (.pdf)
RatioRun2_pion_0.pdf
Figure A.1c
Energy
5.02 TeV
System
Pb-Pb
Scope: PWG
PWG-LF (Light Flavour Spectra)
Figure image (.eps)
RatioRun2_proton_1.eps
Figure image (.pdf)
RatioRun2_proton_1.pdf
Figure A.1d
Energy
5.02 TeV
System
Pb-Pb
Scope: PWG
PWG-LF (Light Flavour Spectra)
Figure image (.eps)
RatioRun2_he3_1.eps
Figure image (.pdf)
RatioRun2_he3_1.pdf
Figure A.1e
Energy
5.02 TeV
System
Pb-Pb
Scope: PWG
PWG-LF (Light Flavour Spectra)
Figure image (.eps)
RatioRun2_triton_0.eps
Figure image (.pdf)
RatioRun2_triton_0.pdf
Figure A.1f
Energy
5.02 TeV
System
Pb-Pb
Scope: PWG
PWG-LF (Light Flavour Spectra)
Figure image (.eps)
RatioRun2_hyp_1.eps
Figure image (.pdf)
RatioRun2_hyp_1.pdf
Figure A.2a
Energy
5.02 TeV
System
Pb-Pb
Scope: PWG
PWG-LF (Light Flavour Spectra)
Figure image (.eps)
covM_0_0.eps
Figure image (.pdf)
covM_0_0.pdf
Figure A.2b
Energy
5.02 TeV
System
Pb-Pb
Scope: PWG
PWG-LF (Light Flavour Spectra)
Figure image (.eps)
covM_0_muQ_0.eps
Figure image (.pdf)
covM_0_muQ_0.pdf
Figure A.3a
Energy
5.02 TeV
System
Pb-Pb
Scope: PWG
PWG-LF (Light Flavour Spectra)
Figure image (.eps)
muBChi2_0.eps
Figure image (.pdf)
muBChi2_0.pdf
Figure A.3b
Energy
5.02 TeV
System
Pb-Pb
Scope: PWG
PWG-LF (Light Flavour Spectra)
Figure image (.eps)
muQChi2_0.eps
Figure image (.pdf)
muQChi2_0.pdf
Figure A.4
Energy
5.02 TeV
System
Pb-Pb
Scope: PWG
PWG-LF (Light Flavour Spectra)
Figure image (.eps)
muBChi2GsiHeidelberg_0.eps
Figure image (.pdf)
muBChi2GsiHeidelberg_0.pdf