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.

Ratios 1

10.17182/hepdata.151650.v1/t1

Antiparticle-to-particle yield ratio, 0-5% centrality
Ratios 2

10.17182/hepdata.151650.v1/t2

Antiparticle-to-particle yield ratio, 5-10% centrality
Ratios 3

10.17182/hepdata.151650.v1/t3

Antiparticle-to-particle yield ratio, 10-30% centrality
Ratios 4

10.17182/hepdata.151650.v1/t4

Antiparticle-to-particle yield ratio, 30-50% centrality
Ratios 5

10.17182/hepdata.151650.v1/t5

Antiparticle-to-particle yield ratio, 50-90% centrality
Chemical potentials, muQ and muB

10.17182/hepdata.151650.v1/t6

Electric-charge and baryon chemical potentials, $\mu_Q$ and $\mu_B$, extracted with the Thermal-FIST code, in the 0-5%, 5-10%, 10-30%, 30-50%, and...
Covariance matrix, muQ vs. muB, 1

10.17182/hepdata.151650.v1/t7

Covariance matrix of the centrality-uncorrelated uncertainties on $\mu_Q$ and $\mu_B$, extracted with the Thermal-FIST code, in the 0-5% centrality class
Covariance matrix, muQ vs. muB, 2

10.17182/hepdata.151650.v1/t8

Covariance matrix of the centrality-uncorrelated uncertainties on $\mu_Q$ and $\mu_B$, extracted with the Thermal-FIST code, in the 5-10% centrality class
Covariance matrix, muQ vs. muB, 3

10.17182/hepdata.151650.v1/t9

Covariance matrix of the centrality-uncorrelated uncertainties on $\mu_Q$ and $\mu_B$, extracted with the Thermal-FIST code, in the 10-30% centrality class
Covariance matrix, muQ vs. muB, 4

10.17182/hepdata.151650.v1/t10

Covariance matrix of the centrality-uncorrelated uncertainties on $\mu_Q$ and $\mu_B$, extracted with the Thermal-FIST code, in the 30-50% centrality class
Covariance matrix, muQ vs. muB, 5

10.17182/hepdata.151650.v1/t11

Covariance matrix of the centrality-uncorrelated uncertainties on $\mu_Q$ and $\mu_B$, extracted with the Thermal-FIST code, in the 50-90% centrality class
Baryon chemical potential, muB

10.17182/hepdata.151650.v1/t12

Baryon chemical potentials, $\mu_B$, extracted with the Thermal-FIST code, in the 0-90% centrality interval
Pion ratio 1

10.17182/hepdata.151650.v1/t13

$p_{\mathrm{T}}$-differential $\pi^{-}/\pi^{+}$ antiparticle-to-particle yield ratio, 0-5% centrality
Pion ratio 2

10.17182/hepdata.151650.v1/t14

$p_{\mathrm{T}}$-differential $\pi^{-}/\pi^{+}$ antiparticle-to-particle yield ratio, 5-10% centrality
Pion ratio 3

10.17182/hepdata.151650.v1/t15

$p_{\mathrm{T}}$-differential $\pi^{-}/\pi^{+}$ antiparticle-to-particle yield ratio, 10-30% centrality
Pion ratio 4

10.17182/hepdata.151650.v1/t16

$p_{\mathrm{T}}$-differential $\pi^{-}/\pi^{+}$ antiparticle-to-particle yield ratio, 30-50% centrality
Pion ratio 5

10.17182/hepdata.151650.v1/t17

$p_{\mathrm{T}}$-differential $\pi^{-}/\pi^{+}$ antiparticle-to-particle yield ratio, 50-90% centrality
Proton ratio 1

10.17182/hepdata.151650.v1/t18

$p_{\mathrm{T}}$-differential $\overline{\mathrm{p}}/\mathrm{p}$ antiparticle-to-particle yield ratio, 0-5% centrality
Proton ratio 2

10.17182/hepdata.151650.v1/t19

$p_{\mathrm{T}}$-differential $\overline{\mathrm{p}}/\mathrm{p}$ antiparticle-to-particle yield ratio, 5-10% centrality
Proton ratio 3

10.17182/hepdata.151650.v1/t20

$p_{\mathrm{T}}$-differential $\overline{\mathrm{p}}/\mathrm{p}$ antiparticle-to-particle yield ratio, 10-30% centrality
Proton ratio 4

10.17182/hepdata.151650.v1/t21

$p_{\mathrm{T}}$-differential $\overline{\mathrm{p}}/\mathrm{p}$ antiparticle-to-particle yield ratio, 30-50% centrality
Proton ratio 5

10.17182/hepdata.151650.v1/t22

$p_{\mathrm{T}}$-differential $\overline{\mathrm{p}}/\mathrm{p}$ antiparticle-to-particle yield ratio, 50-90% centrality
Omega ratio 1

10.17182/hepdata.151650.v1/t23

$c\mathrm{t}$-differential $\overline{ \Omega}^{+} / \Omega^-$ antiparticle-to-particle yield ratio, 0-5% centrality
Omega ratio 2

10.17182/hepdata.151650.v1/t24

$c\mathrm{t}$-differential $\overline{ \Omega}^{+} / \Omega^-$ antiparticle-to-particle yield ratio, 5-10% centrality
Omega ratio 3

10.17182/hepdata.151650.v1/t25

$c\mathrm{t}$-differential $\overline{ \Omega}^{+} / \Omega^-$ antiparticle-to-particle yield ratio, 10-30% centrality
Omega ratio 4

10.17182/hepdata.151650.v1/t26

$c\mathrm{t}$-differential $\overline{ \Omega}^{+} / \Omega^-$ antiparticle-to-particle yield ratio, 30-50% centrality
Omega ratio 5

10.17182/hepdata.151650.v1/t27

$c\mathrm{t}$-differential $\overline{ \Omega}^{+} / \Omega^-$ antiparticle-to-particle yield ratio, 50-90% centrality
Hypertriton ratio 1

10.17182/hepdata.151650.v1/t28

$c\mathrm{t}$-differential ${}_{\overline{\Lambda}}^{3}\overline{\mathrm{H}} / ^{3}_{\Lambda}\mathrm{H}$ antiparticle-to-particle yield ratio, 0-5% centrality
Hypertriton ratio 2

10.17182/hepdata.151650.v1/t29

$c\mathrm{t}$-differential ${}_{\overline{\Lambda}}^{3}\overline{\mathrm{H}} / ^{3}_{\Lambda}\mathrm{H}$ antiparticle-to-particle yield ratio, 5-10% centrality
Hypertriton ratio 3

10.17182/hepdata.151650.v1/t30

$c\mathrm{t}$-differential ${}_{\overline{\Lambda}}^{3}\overline{\mathrm{H}} / ^{3}_{\Lambda}\mathrm{H}$ antiparticle-to-particle yield ratio, 10-30% centrality
Hypertriton ratio 4

10.17182/hepdata.151650.v1/t31

$c\mathrm{t}$-differential ${}_{\overline{\Lambda}}^{3}\overline{\mathrm{H}} / ^{3}_{\Lambda}\mathrm{H}$ antiparticle-to-particle yield ratio, 30-50% centrality
Triton ratio 1

10.17182/hepdata.151650.v1/t32

$p_{\mathrm{T}}$-differential $^{3}\overline{\mathrm{H}} / ^{3}\mathrm{H}$ antiparticle-to-particle yield ratio, 0-5% centrality
Triton ratio 2

10.17182/hepdata.151650.v1/t33

$p_{\mathrm{T}}$-differential $^{3}\overline{\mathrm{H}} / ^{3}\mathrm{H}$ antiparticle-to-particle yield ratio, 5-10% centrality
Triton ratio 3

10.17182/hepdata.151650.v1/t34

$p_{\mathrm{T}}$-differential $^{3}\overline{\mathrm{H}} / ^{3}\mathrm{H}$ antiparticle-to-particle yield ratio, 10-30% centrality
Triton ratio 4

10.17182/hepdata.151650.v1/t35

$p_{\mathrm{T}}$-differential $^{3}\overline{\mathrm{H}} / ^{3}\mathrm{H}$ antiparticle-to-particle yield ratio, 30-50% centrality
Triton ratio 5

10.17182/hepdata.151650.v1/t36

$p_{\mathrm{T}}$-differential $^{3}\overline{\mathrm{H}} / ^{3}\mathrm{H}$ antiparticle-to-particle yield ratio, 50-90% centrality
Helium ratio 1

10.17182/hepdata.151650.v1/t37

$p_{\mathrm{T}}$-differential $^{3}\overline{\mathrm{He}} / ^{3}\mathrm{He}$ antiparticle-to-particle yield ratio, 0-5% centrality
Helium ratio 2

10.17182/hepdata.151650.v1/t38

$p_{\mathrm{T}}$-differential $^{3}\overline{\mathrm{He}} / ^{3}\mathrm{He}$ antiparticle-to-particle yield ratio, 5-10% centrality
Helium ratio 3

10.17182/hepdata.151650.v1/t39

$p_{\mathrm{T}}$-differential $^{3}\overline{\mathrm{He}} / ^{3}\mathrm{He}$ antiparticle-to-particle yield ratio, 10-30% centrality
Helium ratio 4

10.17182/hepdata.151650.v1/t40

$p_{\mathrm{T}}$-differential $^{3}\overline{\mathrm{He}} / ^{3}\mathrm{He}$ antiparticle-to-particle yield ratio, 30-50% centrality
Helium ratio 5

10.17182/hepdata.151650.v1/t41

$p_{\mathrm{T}}$-differential $^{3}\overline{\mathrm{He}} / ^{3}\mathrm{He}$ antiparticle-to-particle yield ratio, 50-90% centrality
Total covariance matrix, muB vs. centrality

10.17182/hepdata.151650.v1/t42

Total covariance matrix of the baryon chemical potential, $\mu_B$, extracted with the Thermal-FIST code, in the 0-5%, 5-10%, 10-30%, 30-50%,...
Total covariance matrix, muQ vs. centrality

10.17182/hepdata.151650.v1/t43

Total covariance matrix of the electric-charge chemical potential, $\mu_Q$, extracted with the Thermal-FIST code, in the 0-5%, 5-10%, 10-30%, 30-50%,...
Chi square profile, muB (Thermal-FIST)

10.17182/hepdata.151650.v1/t44

$\chi^{2}$ of the centrality-averaged baryon chemical potential, $\mu_B$, extracted with the Thermal-FIST code
Chi square profile, muQ (Thermal-FIST)

10.17182/hepdata.151650.v1/t45

$\chi^{2}$ of the centrality-averaged electric-charge chemical potential, $\mu_Q$, extracted with the Thermal-FIST code
Chi square profile, muB (GSI-Heidelberg)

10.17182/hepdata.151650.v1/t46

$\chi^{2}$ of the centrality-averaged baryon chemical potential, $\mu_Q$, extracted with the Thermal-FIST code

Ratios 1

Ratios 2

Ratios 3

Ratios 4

Ratios 5

Chemical potentials, muQ and muB

Covariance matrix, muQ vs. muB, 1

Covariance matrix, muQ vs. muB, 2

Covariance matrix, muQ vs. muB, 3

Covariance matrix, muQ vs. muB, 4

Covariance matrix, muQ vs. muB, 5

Baryon chemical potential, muB

Pion ratio 1

Pion ratio 2

Pion ratio 3

Pion ratio 4

Pion ratio 5

Proton ratio 1

Proton ratio 2

Proton ratio 3

Proton ratio 4

Proton ratio 5

Omega ratio 1

Omega ratio 2

Omega ratio 3

Omega ratio 4

Omega ratio 5

Hypertriton ratio 1

Hypertriton ratio 2

Hypertriton ratio 3

Hypertriton ratio 4

Triton ratio 1

Triton ratio 2

Triton ratio 3

Triton ratio 4

Triton ratio 5

Helium ratio 1

Helium ratio 2

Helium ratio 3

Helium ratio 4

Helium ratio 5

Total covariance matrix, muB vs. centrality

Total covariance matrix, muQ vs. centrality

Chi square profile, muB (Thermal-FIST)

Chi square profile, muQ (Thermal-FIST)

Chi square profile, muB (GSI-Heidelberg)

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