CERN Accelerating science

(Color online) Example invariant-mass distributions for the \ks in the 0-20\% centrality interval in two \ptt ranges: $0.8<\ptt<1.2$~\gvc (panels (a) and (b)) and $2.5<\ptt<3$~\gvc (panels (c) and (d)). Panels (a) and (c) show the unlike-charge invariant-mass distributions for \ks with combinatorial backgrounds. Panels (b) and (d) show the invariant-mass distributions after subtraction of the mixed-event background with fits to describe the peaks of the \ks (solid curves) and residual backgrounds (dashed curves). In the interval $0.8<\ptt<1.2$~\gvc ($2.5<\ptt<3$~\gvc), the uncorrected \ks yield is 7.4 (2.4) million, or 2.4 (0.80) per event; the signal-to-background ratio is $1.1\tms 10^{-4}$ ($5.6\tms 10^{-4}$) and the significance of the \ks peak is 17 (25). Only statistical uncertainties are shown.

Example invariant-mass distributions for the \ks in the 0-20\% centrality interval in two \ptt ranges: $0.8<\ptt<1.2$~\gvc (panels (a) and (b)) and $2.5<\ptt<3$~\gvc (panels (c) and (d)). Panels (a) and (c) show the unlike-charge invariant-mass distributions for \ks with combinatorial backgrounds. Panels (b) and (d) show the invariant-mass distributions after subtraction of the mixed-event background with fits to describe the peaks (solid curves) and residual backgrounds (dashed curves) of the \ks. In the interval $0.8<\ptt<1.2$~\gvc ($2.5<\ptt<3$~\gvc), the uncorrected \ks yield is 7.4 (2.4) million, or 2.4 (0.80) per event; the signal-to-background ratio is $1.1\tms 10^{-4}$ ($5.6\tms 10^{-4}$) and the significance of the \ks peak is 17 (25). Only statistical uncertainties are shown.

(Color online) Example invariant-mass distributions for the \ph in the 0-10\% centrality interval in two \ptt ranges: $0.8<\ptt<1$~\gvc (panels (a) and (b)) and $2.5<\ptt<3$~\gvc (panels (c) and (d)). Panels (a) and (c) show the unlike-charge invariant-mass distributions for \ph with combinatorial backgrounds. Panels (b) and (d) show the invariant-mass distributions after subtraction of the mixed-event background with fits to describe the peaks of the \ph (solid curves) and residual backgrounds (dashed curves). In the interval $0.8<\ptt<1.2$~\gvc ($2.5<\ptt<3$~\gvc), the uncorrected \ph yield is 174,000 (149,000), or 0.11 (0.095) per event; the signal-to-background ratio is 0.01 (0.0035) and the significance of the \ph peak is 38 (21). Only statistical uncertainties are shown.

Example invariant-mass distributions for the \ph in the 0-10\% centrality interval in two \ptt ranges: $0.8<\ptt<1$~\gvc (panels (a) and (b)) and $2.5<\ptt<3$~\gvc (panels (c) and (d)). Panels (a) and (c) show the unlike-charge invariant-mass distributions for \ph with combinatorial backgrounds. Panels (b) and (d) show the invariant-mass distributions after subtraction of the mixed-event background with fits to describe the peaks (solid curves) and residual backgrounds (dashed curves) of the \ph. In the interval $0.8<\ptt<1.2$~\gvc ($2.5<\ptt<3$~\gvc), the uncorrected \ph yield is 174,000 (149,000), or 0.11 (0.095) per event; the signal-to-background ratio is 0.01 (0.0035) and the significance of the \ph peak is 38 (21). Only statistical uncertainties are shown.

(Color online) Tracking Efficiency $\times$ Acceptance as a function of \ptt for \ks (a) and \ph (b) mesons, calculated from simulated \pb collisions at \rsnn. For the \ph meson, only five examples for wide centrality intervals are shown. The values shown here do not include the branching ratios. Only statistical uncertainties are shown.

Tracking Efficiency $\times$ Acceptance as a function of \ptt for \ks (a) and \ph (b) mesons, calculated from simulated \pb collisions at \rsnn. For the \ph meson, only five examples for wide centrality intervals are shown. The values shown here do not include the branching ratios. Only statistical uncertainties are shown.

(Color online) Transverse-momentum distributions of \ks (a) and \ph (b) mesons in multiple centrality intervals with blast-wave fitting functions. The measured data are plotted at the center of each \ptt bin. Statistical uncertainties are shown as bars and systematic uncertainties are shown as boxes.

Transverse-momentum distributions of \ks (a) and \ph (b) mesons in multiple centrality intervals with blast-wave fitting functions. The measured data are plotted at the center of each \ptt bin. Statistical uncertainties are shown as bars and systematic uncertainties are shown as boxes.

(Color online) Measured \ks meson mass (a) and width (b) in \pb collisions at \rsnn in the 0-20\% and 60-80\% centrality intervals, along with the values extracted from Monte-Carlo HIJING simulations. Measured \ph meson mass (c) and width (d) in \pb collisions at \rsnn in the 0-10\% and 70-80\% centrality intervals. The \ph width extracted from HIJING simulations is also shown. The vacuum values of the \ks and \ph mass and width~\cite{PDG} are indicated by the horizontal dashed lines. Statistical uncertainties are shown as bars and systematic uncertainties are shown as boxes.

Transverse-momentum distributions of \ks (a) and \ph (b) mesons in multiple centrality intervals with blast-wave fitting functions. The measured data are plotted at the center of each \ptt bin. Statistical uncertainties are shown as bars and systematic uncertainties are shown as boxes.

(Color online) Particle ratios \kskm and \phikm as a function of \dncr~\cite{ALICE_multiplicity,ALICE_multiplicity_pp7TeV} for \pb collisions at \rsnn and pp collisions at \rs~\cite{ALICE_kstar_phi_7TeV,ALICE_piKp_7TeV}. Statistical uncertainties are shown as bars. The shaded boxes show systematic uncertainties that are not correlated between centrality intervals, while the open boxes show the total systematic uncertainties including both correlated and uncorrelated sources. The values given by a grand-canonical thermal model with a chemical freeze-out temperature of 156~MeV are also shown~\cite{Stachel_SQM2013}.

Measured \ks meson mass (a) and width (b) in \pb collisions at \rsnn in the 0-20\% and 60-80\% centrality intervals, along with the values extracted from Monte-Carlo HIJING simulations. Measured \ph meson mass (c) and width (d) in \pb collisions at \rsnn in the 0-10\% and 70-80\% centrality intervals. The \ph width extracted from HIJING simulations is also shown. The vacuum values of the \ks and \ph mass and width~\cite{PDG} are indicated by the horizontal dashed lines. Statistical uncertainties are shown as bars and systematic uncertainties are shown as boxes.

(Color online) Particle ratios \kskm (a,b) and \phikm (c,d) in pp, \dau, and \ada collisions~\cite{ALICE_strange_900GeV,ALICE_kstar_phi_7TeV,STAR_Kstar_200GeV_2005,STAR_Kstar_2011,STAR_phi_200GeV_2005,STAR_phi_2009,ALICE_piKp_7TeV,NA49_phi_2000,NA49_phi_2008,NA49_piK_2002,STAR_phi_130GeV,PHENIX_mesons_pp_2011,PHENIX_piKp_pp_2011,PHENIX_phi_AuAu_2005,ALICE_piKp_900GeV}. In panels (a) and (c) these ratios are presented for different centrality intervals as a function of \dncr~\cite{ALICE_multiplicity,STAR_centrality_2009,ALICE_multiplicity_pp7TeV,STAR_piKp_CuCu}. In panels (b) and (d), these ratios are presented for pp, central \dau, and central \ada collisions as a function of \rsnno. For quantities marked ``*", boxes represent the total uncertainty (separate uncertainties are not reported). Otherwise, bars represent statistical uncertainties and boxes represent systematic uncertainties. In panel (c), the two most central \phikm points for \au collisions are for overlapping centrality intervals (0-5\% and 0-10\%). In panel (d) the \phikm points for pp and \dau collisions at \rsnn[200~GeV] have been shifted horizontally for visibility. The values given by a grand-canonical thermal model with a chemical freeze-out temperature of 156~MeV are also shown~\cite{Stachel_SQM2013}.

Particle ratios \kskm and \phikm as a function of \dncr~\cite{ALICE_multiplicity,ALICE_multiplicity_pp7TeV} for \pb collisions at \rsnn and pp collisions at \rs~\cite{ALICE_kstar_phi_7TeV,ALICE_piKp_7TeV}. Statistical uncertainties are shown as bars. The shaded boxes show systematic uncertainties that are not correlated between centrality intervals, while the open boxes show the total systematic uncertainties including both correlated and uncorrelated sources. The values given by a grand-canonical thermal model with a chemical freeze-out temperature of 156~MeV are also shown~\cite{Stachel_SQM2013}.

(Color online) Transverse-momentum distributions of \ks and \ph resonances in \pb collisions at \rsnn with blast-wave predictions of the shapes for central (a) and peripheral (b) collisions. The predicted distributions are normalized to the expected resonance yields based on the measured yield of charged kaons in \pb collisions~\cite{ALICE_piKp_PbPb} multiplied by the \ksk and \phik ratios given by a thermal-model fit to ALICE data~\cite{Stachel_SQM2013}. Statistical uncertainties are shown as bars and systematic uncertainties are shown as boxes. The shaded bands indicate the uncertainties in the normalization of the predicted distributions. The lower panels show the ratios of the measured distributions to the predictions.

Particle ratios \kskm (a,b) and \phikm (c,d) in pp and \ada collisions~\cite{ALICE_strange_900GeV,ALICE_kstar_phi_7TeV,STAR_Kstar_200GeV_2005,STAR_Kstar_2011,STAR_phi_200GeV_2005,STAR_phi_2009,ALICE_piKp_7TeV,NA49_phi_2000,NA49_phi_2008,NA49_piK_2002,STAR_phi_130GeV,PHENIX_mesons_pp_2011,PHENIX_piKp_pp_2011,PHENIX_phi_AuAu_2005,ALICE_piKp_900GeV}. In panels (a) and (c) these ratios are presented for different centrality intervals as a function of \dncr~\cite{ALICE_multiplicity,STAR_centrality_2009,ALICE_multiplicity_pp7TeV,STAR_piKp_CuCu}. In panels (b) and (d), these ratios are presented for pp and central \ada collisions as a function of \rsnno. For quantities marked ``*", boxes represent the total uncertainty (separate uncertainties are not reported). Otherwise, bars represent statistical uncertainties and boxes represent systematic uncertainties. In panel (c), the two most central \ph points for \au collisions are for overlapping centrality intervals (0-5\% and 0-10\%). In panel (d) the \phikm points for pp and \dau collisions at \rsnn[200~GeV] have been shifted horizontally for visibility. The values given by a grand-canonical thermal model with a chemical freeze-out temperature of 156~MeV are also shown~\cite{Stachel_SQM2013}.

(Color online) \mpt for \ks (a) and \ph mesons (b) as a function of \npart~\cite{ALICE_centrality} in \pb collisions at \rsnn. Also shown are \mpt for minimum-bias pp collisions at \rs~\cite{ALICE_kstar_phi_7TeV} and measurements of \mpt for pp~\cite{STAR_Kstar_200GeV_2005,STAR_phi_200GeV_2005} and \au~\cite{STAR_Kstar_2011,STAR_phi_2009,STAR_centrality_2009} collisions at \rsnn[200~GeV]. Statistical uncertainties are shown as bars and systematic uncertainties are shown as boxes. The most peripheral \ks points for \ada collisions (with $\npart\approx 20$) have been shifted horizontally for visibility. The two most central \ph points for \au collisions are for overlapping centrality intervals (0-5\% and 0-10\%).

Transverse-momentum distributions of \ks and \ph resonances in \pb collisions at \rsnn with blast-wave predictions of the shapes for central (a) and peripheral (b) collisions. The predicted distributions are normalized to the expected resonance yields based on the measured yield of charged kaons in \pb collisions~\cite{ALICE_piKp_PbPb} multiplied by the \ksk and \phik ratios given by a thermal-model fit to ALICE data~\cite{Stachel_SQM2013}. Statistical uncertainties are shown as bars and systematic uncertainties are shown as boxes. The shaded bands indicate the uncertainties in the normalization of the predicted distributions. The lower panels show the ratios of the measured distributions to the predictions.

(Color online) Mean transverse momentum of \pip, \kp, \ks, p, and \ph in \pb collisions at \rsnn (filled symbols)~\cite{ALICE_piKp_PbPb} as a function of \npart~\cite{ALICE_centrality}. Also shown are \mpt values for the resonances in pp collisions at \rs~\cite{ALICE_kstar_phi_7TeV} (open symbols). The measurements for central and mid-central \ph and p have been shifted horizontally for visibility.

Transverse-momentum distributions of \ks and \ph resonances in \pb collisions at \rsnn with blast-wave predictions of the shapes for central (a) and peripheral (b) collisions. The predicted distributions are normalized to the expected resonance yields based on the measured yield of charged kaons in \pb collisions~\cite{ALICE_piKp_PbPb} multiplied by the \ksk and \phik ratios given by a thermal-model fit to ALICE data~\cite{Stachel_SQM2013}. Statistical uncertainties are shown as bars and systematic uncertainties are shown as boxes. The shaded bands indicate the uncertainties in the normalization of the predicted distributions. The lower panels show the ratios of the measured distributions to the predictions.

(Color online) (a): Comparison of the measured \ph meson \ptt distribution in \pb collisions at \rsnn (centrality 0-10\%) to the distribution predicted by the Krak\'{o}w model~\cite{KRAKOW}, two versions of the VISH2+1 model~\cite{VISH2p1_MCGlb,VISH2p1_MCKLN}, the VISHNU~\cite{VISHNU_2013,VISHNU} model, and the HKM~\cite{HKM_2011,HKM_2013}. The curves show the original predictions, while the horizontal lines show the predicted distributions re-binned so that they have compatible \ptt bins with the measured distribution. (b): The ratio of the re-binned predictions to the measured distribution for \ph mesons. The shaded band shows the fractional uncertainty of the measured data points.

\mpt for \ks (a) and \ph mesons (b) as a function of \npart~\cite{ALICE_centrality} in \pb collisions at \rsnn. Also shown are \mpt for minimum-bias pp collisions at \rs~\cite{ALICE_kstar_phi_7TeV} and measurements of \mpt for pp~\cite{STAR_Kstar_200GeV_2005,STAR_phi_200GeV_2005} and \au~\cite{STAR_Kstar_2011,STAR_phi_2009,STAR_centrality_2009} collisions at \rsnn[200~GeV]. Statistical uncertainties are shown as bars and systematic uncertainties are shown as boxes. The most peripheral \ks points for \ada collisions (with $\npart\approx 20$) have been shifted horizontally for visibility. The two most central \ph points for \au collisions are for overlapping centrality intervals (0-5\% and 0-10\%).

Mean transverse momentum of \pip, \kp, \ks, p, and \ph in \pb collisions at \rsnn (filled symbols)~\cite{ALICE_piKp_PbPb} as a function of \npart~\cite{ALICE_centrality}. Also shown are \mpt values for the resonances in pp collisions at \rs~\cite{ALICE_kstar_phi_7TeV} (open symbols). The measurements for central and mid-central \ph and p have been shifted horizontally for visibility.

(Color online) Ratio \omxphi as a function of \ptt for \pb collisions at \rsnn (centrality 0-10\%)~\cite{ALICE_multistrange_PbPb}, pp collisions at \rs~\cite{ALICE_kstar_phi_7TeV,ALICE_multistrange_7TeV} and \au collisions at \rsnn[200~GeV] (centrality 0-12\%)~\cite{STAR_phi_2009}. Statistical uncertainties are shown as bars, systematic uncertainties are shown as shaded boxes, and the sum in quadrature of the statistical and systematic uncertainties (for the pp data) is shown as open boxes. Also shown are predictions of this ratio made by various models for central \pb collisions at \rsnn (centrality 0-20\% for HIJING/B$\overline{\mathrm{B}}$, centrality 0-10\% for the other models)~\cite{KRAKOW,VISH2p1_MCGlb,VISH2p1_MCKLN,HIJINGBBbar_2011a,HIJINGBBbar_2011b,HKM_2013}.

(Color online) (a): Ratio \pphi as a function of \ptt for \pb collisions at \rsnn~\cite{ALICE_piKp_PbPb,ALICE_piKp_PbPb_combined} for four centrality intervals. (b): Ratios of p and \ph yields to charged pions as a function of \ptt for central \pb collisions at \rsnn~\cite{ALICE_piKp_PbPb,ALICE_piKp_PbPb_combined}. The \ppi ratio is presented using two \ptt binning schemes: the ratio with its original measured bins is shown along with a recalculated version that uses the same bins as the \ph meson \ptt distribution for $0.5<\ptt<5$~\gvc. In order to show the similarity of the shapes of the two ratios for $\ptt<3$~\gvc, the \phipi ratio has been scaled so that the \ph and proton integrated yields are identical.

(a): Comparison of the measured \ph meson \ptt distribution in \pb collisions at \rsnn (centrality 0-10\%) to the distribution predicted by the Krak\'{o}w model~\cite{KRAKOW}, two versions of the VISH2+1 model~\cite{VISH2p1_MCGlb,VISH2p1_MCKLN}, the VISHNU~\cite{VISHNU_2013,VISHNU} model, and the HKM~\cite{HKM_2011,HKM_2013}. The curves show the original predictions, while the horizontal lines show the predicted distributions re-binned so that they have compatible \ptt bins with the measured distribution. (b): The ratio of the re-binned predictions to the measured distribution for \ph mesons. The shaded band shows the fractional uncertainty of the measured data points.

Ratio \omxphi as a function of \ptt for \pb collisions at \rsnn (centrality 0-10\%)~\cite{ALICE_multistrange_PbPb}, pp collisions at \rs~\cite{ALICE_kstar_phi_7TeV,ALICE_multistrange_7TeV} and \au collisions at \rsnn[200~GeV] (centrality 0-12\%)~\cite{STAR_phi_2009}. Statistical uncertainties are shown as bars, systematic uncertainties are shown as shaded boxes, and the sum in quadrature of the statistical and systematic uncertainties (for the pp data) is shown as open boxes. Also shown are predictions of this ratio made by various models for central \pb collisions at \rsnn (centrality 0-20\% for HIJING/B$\overline{\mathrm{B}}$, centrality 0-10\% for the other models)~\cite{KRAKOW,VISH2p1_MCGlb,VISH2p1_MCKLN,HIJINGBBbar_2011a,HIJINGBBbar_2011b,HKM_2013}.

(Color online) (a): Enhancement of \ph, $\Lambda$, $\Xi$, and $\Omega$ in \pb collisions at \rsnn~\cite{ALICE_multistrange_PbPb,ALICE_k0s_Lambda_PbPb}, calculated using pp reference yields (extrapolated for $\Lambda$, interpolated for \ph, $\Xi$, and $\Omega$). Also shown is the enhancement of the \ph in \au collisions at \rsnn[200~GeV]~\cite{STAR_phi_2009b}, calculated using a measured pp reference yield. The two most central \ph enhancement values for \au collisions are for overlapping centrality intervals (0-5\% and 0-10\%). Bars represent the uncertainties in the \pb yields, while the boxes at low values of \npart represent the uncertainties of the pp reference yields. The \ph and $\Lambda$ measurements at $\npart=7.5$ have been shifted horizontally for visibility. (b): Ratios of particle yields to charged pion yields for \pb collisions at \rsnn~\cite{ALICE_piKp_PbPb,ALICE_multistrange_PbPb,ALICE_k0s_Lambda_PbPb}, \au collisions at \rsnn[200~GeV]~\cite{STAR_phi_2009,STAR_centrality_2009,STAR_XiOmega_2007,STAR_strange_2012}, and pp collisions at \rs[200~GeV]~\cite{STAR_strange_pp_2007,STAR_phi_200GeV_2005,STAR_centrality_2009}, 900~GeV~\cite{ALICE_strange_900GeV,ALICE_piKp_900GeV}, and 7 TeV~\cite{ALICE_kstar_phi_7TeV,ALICE_piKp_7TeV,ALICE_multistrange_7TeV}. The lines show ratios given by grand-canonical thermal models with temperatures of 170~MeV~\cite{Cleymans_2006} (upper dashed lines), 164~MeV~\cite{Andronic2009,Andronic2009_Erratum} (solid lines), and 156~MeV~\cite{Stachel_SQM2013} (lower dashed lines). The total uncertainties are shown as bars. Some of the measurements at $\npart=2$ have been shifted horizontally for visibility. The two most central \phipi values for \au collisions are for overlapping centrality intervals (0-5\% and 0-10\%).

(a): Ratio \pphi as a function of \ptt for \pb collisions at \rsnn~\cite{ALICE_piKp_PbPb,ALICE_piKp_PbPb_highpT,ALICE_piKp_PbPb_combined} for four centrality intervals. (b): Ratios of p and \ph yields to charged pions as a function of \ptt for central \pb collisions at \rsnn~\cite{ALICE_piKp_PbPb,ALICE_piKp_PbPb_highpT,ALICE_piKp_PbPb_combined}. The \ppi ratio is presented using two \ptt binning schemes: the ratio with its original measured bins is shown along with a recalculated version that uses the same bins as the \ph meson \ptt distribution for $0.5<\ptt<5$~\gvc. In order to show the similarity of the shapes of the two ratios for $\ptt<3$~\gvc, the \phipi ratio has been scaled so that the \ph and proton integrated yields are identical.

(a): Ratio \pphi as a function of \ptt for \pb collisions at \rsnn~\cite{ALICE_piKp_PbPb,ALICE_piKp_PbPb_highpT,ALICE_piKp_PbPb_combined} for four centrality intervals. (b): Ratios of p and \ph yields to charged pions as a function of \ptt for central \pb collisions at \rsnn~\cite{ALICE_piKp_PbPb,ALICE_piKp_PbPb_highpT,ALICE_piKp_PbPb_combined}. The \ppi ratio is presented using two \ptt binning schemes: the ratio with its original measured bins is shown along with a recalculated version that uses the same bins as the \ph meson \ptt distribution for $0.5<\ptt<5$~\gvc. In order to show the similarity of the shapes of the two ratios for $\ptt<3$~\gvc, the \phipi ratio has been scaled so that the \ph and proton integrated yields are identical.

(a): Enhancement of \ph, $\Lambda$, $\Xi$, and $\Omega$ in \pb collisions at \rsnn~\cite{ALICE_multistrange_PbPb,ALICE_k0s_Lambda_PbPb}, calculated using pp reference yields (extrapolated for $\Lambda$, interpolated for \ph, $\Xi$, and $\Omega$). Also shown is the enhancement of the \ph in \au collisions at \rsnn[200~GeV]~\cite{STAR_phi_2009b}, calculated using a measured pp reference yield. The two most central \ph enhancement values for \au collisions are for overlapping centrality intervals (0-5\% and 0-10\%). Bars represent the uncertainties in the \pb yields, while the boxes at low values of \npart represent the uncertainties of the pp reference yields. The \ph and $\Lambda$ measurements at $\npart=7.5$ have been shifted horizontally for visibility. (b): Ratios of particle yields to charged pion yields for \pb collisions at \rsnn~\cite{ALICE_piKp_PbPb,ALICE_multistrange_PbPb,ALICE_k0s_Lambda_PbPb}, \au collisions at \rsnn[200~GeV]~\cite{STAR_phi_2009,STAR_centrality_2009,STAR_XiOmega_2007,STAR_strange_2012}, and pp collisions at \rs[200~GeV]~\cite{STAR_strange_pp_2007}, 900~GeV~\cite{ALICE_strange_900GeV,ALICE_piKp_900GeV}, and 7 TeV~\cite{ALICE_kstar_phi_7TeV,ALICE_piKp_7TeV,ALICE_multistrange_7TeV}. The lines show ratios given by grand-canonical thermal models with temperatures of 170~MeV~\cite{Cleymans_2006} (upper dashed lines), 164~MeV~\cite{Andronic2009,Andronic2009_Erratum} (solid lines), and 156~MeV~\cite{Stachel_SQM2013} (lower dashed lines). The total uncertainties are shown as bars. Some of the measurements at $\npart=2$ have been shifted horizontally for visibility. The two most central \phipi values for \au collisions are for overlapping centrality intervals (0-5\% and 0-10\%).

(a): Enhancement of \ph, $\Lambda$, $\Xi$, and $\Omega$ in \pb collisions at \rsnn~\cite{ALICE_multistrange_PbPb,ALICE_k0s_Lambda_PbPb}, calculated using pp reference yields (extrapolated for $\Lambda$, interpolated for \ph, $\Xi$, and $\Omega$). Also shown is the enhancement of the \ph in \au collisions at \rsnn[200~GeV]~\cite{STAR_phi_2009b}, calculated using a measured pp reference yield. The two most central \ph enhancement values for \au collisions are for overlapping centrality intervals (0-5\% and 0-10\%). Bars represent the uncertainties in the \pb yields, while the boxes at low values of \npart represent the uncertainties of the pp reference yields. The \ph and $\Lambda$ measurements at $\npart=7.5$ have been shifted horizontally for visibility. (b): Ratios of particle yields to charged pion yields for \pb collisions at \rsnn~\cite{ALICE_piKp_PbPb,ALICE_multistrange_PbPb,ALICE_k0s_Lambda_PbPb}, \au collisions at \rsnn[200~GeV]~\cite{STAR_phi_2009,STAR_centrality_2009,STAR_XiOmega_2007,STAR_strange_2012}, and pp collisions at \rs[200~GeV]~\cite{STAR_strange_pp_2007}, 900~GeV~\cite{ALICE_strange_900GeV,ALICE_piKp_900GeV}, and 7 TeV~\cite{ALICE_kstar_phi_7TeV,ALICE_piKp_7TeV,ALICE_multistrange_7TeV}. The lines show ratios given by grand-canonical thermal models with temperatures of 170~MeV~\cite{Cleymans_2006} (upper dashed lines), 164~MeV~\cite{Andronic2009,Andronic2009_Erratum} (solid lines), and 156~MeV~\cite{Stachel_SQM2013} (lower dashed lines). The total uncertainties are shown as bars. Some of the measurements at $\npart=2$ have been shifted horizontally for visibility. The two most central \phipi values for \au collisions are for overlapping centrality intervals (0-5\% and 0-10\%).