{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.168317.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/3150962"}}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"CMS Collaboration"},"creator":{"@type":"Organization","name":"CMS Collaboration"},"datePublished":"2026","description":"The inclusive cross section for top quark pair ($t\\bar{t}$) production in lead-lead (PbPb) collisions is reported for the first time at a center-of-mass energy per nucleon pair of 5.36\\TeV. The analysis uses data corresponding to an integrated luminosity of 1.58 $nb^{-1}$ collected by the CMS experiment at the CERN LHC in 2023. The $t\\bar{t}$ production cross section, $\\sigma_{t\\bar{t}}=3.42^{+0.54}_{-0.51}(stat)^{+0.50}_{-0.43}(syst)~{\\mu b}$, is measured in dilepton final states using a fit to a multivariate discriminator that combines the decay electron and muon kinematic properties with the multiplicity of bottom quark jets. The result is consistent with perturbative quantum chromodynamics calculations at next-to-next-to-leading order (NNLO) accuracy employing several nuclear parton distribution functions. In addition, the Drell--Yan production cross section ($\\sigma_\\text{DY}$) for dilepton masses above 10 GeV and the ratio of $t\\bar{t}$ to DY cross sections ($R_{t\\bar{t}/DY}$) are found to be compatible with the NNLO predictions. The observables $\\sigma_{t\\bar{t}}$, $\\sigma_\\text{DY}$, and $R_{t\\bar{t}/DY}$ are measured separately for central and semicentral PbPb collisions to investigate for the first time the dependence of top quark production on the collision impact parameter.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.168317.v1/t1","@type":"Dataset","description":"Distribution of dilepton $p_{\\rm T}(\\ell\\ell)$ variable in the same-flavor ($\\ell\\ell$) channels. The event counts are divided by the variable bin...","name":"Figure 1 left"},{"@id":"https://doi.org/10.17182/hepdata.168317.v1/t2","@type":"Dataset","description":"Distribution of dilepton $m(\\ell\\ell)$ variable in the same-flavor ($\\ell\\ell$) channels.","name":"Figure 1 right"},{"@id":"https://doi.org/10.17182/hepdata.168317.v1/t3","@type":"Dataset","description":"Distribution of the $p_{\\rm T}(\\ell_2)$ variable in the different-flavor (\\emu) channel. The last bin includes the overflow entries.","name":"Figure 2 left"},{"@id":"https://doi.org/10.17182/hepdata.168317.v1/t4","@type":"Dataset","description":"Distribution of the $p_{\\rm T}(\\ell\\ell)$ variable in the different-flavor (\\emu) channel. The last bin includes the overflow entries.","name":"Figure 2 middle"},{"@id":"https://doi.org/10.17182/hepdata.168317.v1/t5","@type":"Dataset","description":"Distributions of the $\\sum |\\eta_\\ell|$ (lower) variable in the different-flavor (\\emu) channel. The last bin includes the overflow entries.","name":"Figure 2 right"},{"@id":"https://doi.org/10.17182/hepdata.168317.v1/t6","@type":"Dataset","description":"Distribution of the $R_{p_T}= p_T(jet)/p_T(Z)$ ratio in Z + jet events in the 0\u201310% PbPb centralities.","name":"Figure 3 left"},{"@id":"https://doi.org/10.17182/hepdata.168317.v1/t7","@type":"Dataset","description":"Distribution of the $R_{p_T}= p_T(jet)/p_T(Z)$ ratio in Z + jet events in the 10\u201390% PbPb centralities.","name":"Figure 3 right"},{"@id":"https://doi.org/10.17182/hepdata.168317.v1/t8","@type":"Dataset","description":"Ratio of the average $$ distributions measured in data over simulation as a function of the collision centrality.","name":"Figure 4"},{"@id":"https://doi.org/10.17182/hepdata.168317.v1/t9","@type":"Dataset","description":"Multiplicities of inclusive jets in Z boson candidate events in the 0-10% centrality bins measured in the data.","name":"Figure 5 upper left"},{"@id":"https://doi.org/10.17182/hepdata.168317.v1/t10","@type":"Dataset","description":"Multiplicities of inclusive jets in Z boson candidate events in the 10-90% centrality bins measured in the data.","name":"Figure 5 upper right"},{"@id":"https://doi.org/10.17182/hepdata.168317.v1/t11","@type":"Dataset","description":"Multiplicities of inclusive b-tagged jets in Z boson candidate events in the 0-10% centrality bins measured in the data.","name":"Figure 5 lower left"},{"@id":"https://doi.org/10.17182/hepdata.168317.v1/t12","@type":"Dataset","description":"Multiplicities of inclusive b-tagged jets in Z boson candidate events in the 10-90% centrality bins measured in the data.","name":"Figure 5 lower right"},{"@id":"https://doi.org/10.17182/hepdata.168317.v1/t13","@type":"Dataset","description":"Distributions of the final BDT discriminator after the fit for the same-flavor channel in the 0-10% centrality bins measured in...","name":"Figure 6 upper left"},{"@id":"https://doi.org/10.17182/hepdata.168317.v1/t14","@type":"Dataset","description":"Distributions of the final BDT discriminator after the fit for the same-flavor channel in the 10-90% centrality bins measured in...","name":"Figure 6 upper right"},{"@id":"https://doi.org/10.17182/hepdata.168317.v1/t15","@type":"Dataset","description":"Distributions of the final BDT discriminator after the fit for the e$\\mu$ channel in the 0-10% centrality bins measured in...","name":"Figure 6 lower left"},{"@id":"https://doi.org/10.17182/hepdata.168317.v1/t16","@type":"Dataset","description":"Distributions of the final BDT discriminator after the fit for the e$\\mu$ channel in the 10-90% centrality bins measured in...","name":"Figure 6 lower right"},{"@id":"https://doi.org/10.17182/hepdata.168317.v1/t17","@type":"Dataset","description":"Scan of the profile likelihood as a function of the $t\\bar{t}$ signal strength. The curves correspond to the expected, observed...","name":"Figure 7"},{"@id":"https://doi.org/10.17182/hepdata.168317.v1/t18","@type":"Dataset","description":"Postfit covariance matrix for the $t\\bar{t}$ signal strength.","name":"Covariance matrix"},{"@id":"https://doi.org/10.17182/hepdata.168317.v1/t19","@type":"Dataset","description":"Impact of systematic uncertainties on the fitted tt signal strength parameter. The systematic uncertainties are listed in decreasing order of...","name":"Figure 8"},{"@id":"https://doi.org/10.17182/hepdata.168317.v1/t20","@type":"Dataset","description":"Measured $t\\bar{t}$ cross section, DY cross section, and $R_{t\\bar{t}/DY}$ ratio for three different PbPb centrality selections. The statistical and systematic...","name":"Table 1"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins3150962?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/168317"}],"inLanguage":"en","name":"Measurement of the top quark pair production cross section in PbPb collisions at $\\sqrt{s_\\mathrm{NN}}$ = 5.36 TeV","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins3150962?version=1","version":1}