{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.159754.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/3159175"}}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"CMS Collaboration"},"creator":{"@type":"Organization","name":"CMS Collaboration"},"datePublished":"2026","description":"Decays of $\\mathrm{Z}$ bosons to four charged leptons (electrons and muons) are studied in proton-proton collisions at $\\sqrt{s} = 8$ and 13 TeV. The analysis is based on data collected with the CMS detector at the LHC corresponding to an integrated luminosity of 19.7 fb$^{-1}$ at 8 TeV and 138 fb$^{-1}$ at 13 TeV. The measured value of the inclusive branching fraction for all four-lepton decay modes, $\\mathcal{B}(\\mathrm{Z}\\rightarrow 4\\ell)$, is $(4.67 \\pm 0.11 \\,\\mathrm{(stat)} \\pm 0.10 \\,\\mathrm{(syst)}) \\times 10^{-6} $, which has a precision of about 3% limited by both statistical and systematic uncertainties. Measurements of the individual branching fractions for the decays $\\mathrm{Z} \\to 4\\mu$, $\\mathrm{Z} \\to 4e$, and $\\mathrm{Z} \\to 2\\mu 2e$ are also reported. Differential decay rates are presented as functions of kinematic and angular quantities in the $\\mathrm{Z}$ boson rest frame. Measurements of triple-product asymmetries, which are sensitive to possible violations of charge conjugation and parity invariance, are performed for $\\mathrm{Z} \\to 4\\ell$ decays. The results are compared with standard model predictions and used to set limits on the production of new gauge bosons.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.159754.v1/t1","@type":"Dataset","description":"Observed event yields and sample composition for the $\\mathrm{Z}\\rightarrow 4\\ell$ signal region listed for the summ of all $4\\ell$ channels...","name":"Table 3"},{"@id":"https://doi.org/10.17182/hepdata.159754.v1/t2","@type":"Dataset","description":"Observed event yields and sample composition for the $\\mathrm{Z}\\rightarrow \\ell^+\\ell^-$ signal regions, inclusive of all 8 and 13~TeV samples. The...","name":"Table 4"},{"@id":"https://doi.org/10.17182/hepdata.159754.v1/t3","@type":"Dataset","description":"Measured branching fractions. The measured values for individual channels $4\\mu$, $2\\mu 2e$, and $4e$ are determined from the BSM fit...","name":"Table 5"},{"@id":"https://doi.org/10.17182/hepdata.159754.v1/t4","@type":"Dataset","description":"The number of $\\mathrm{Z}\\rightarrow 4\\ell$ events $N_+$ ($N_-$) in which $\\sin\\phi > 0$ ($< 0$), and the associated asymmetry $A_{\\sin\\phi}$...","name":"Table 6"},{"@id":"https://doi.org/10.17182/hepdata.159754.v1/t5","@type":"Dataset","description":"Upper limits at 95% CL on the branching fractions listed in Table 5","name":"Table 7"},{"@id":"https://doi.org/10.17182/hepdata.159754.v1/t6","@type":"Dataset","description":"The differential $\\mathrm{Z}\\rightarrow 4\\ell$ decay rate $d\\Gamma / dm_{\\mathrm{Z}_1}$ defined in Section 8.2. This distribution has been unfolded and scaled...","name":"Figure 4a"},{"@id":"https://doi.org/10.17182/hepdata.159754.v1/t7","@type":"Dataset","description":"The differential $\\mathrm{Z}\\rightarrow 4\\ell$ decay rate $d\\Gamma / dm_{\\mathrm{Z}_2}$ defined in Section 8.2. This distribution has been unfolded and scaled...","name":"Figure 4b"},{"@id":"https://doi.org/10.17182/hepdata.159754.v1/t8","@type":"Dataset","description":"The differential $\\mathrm{Z}\\rightarrow 4\\ell$ decay rate $d\\Gamma / dp_{{\\ell}_1}$ defined in Section 8.2. This distribution has been unfolded and scaled...","name":"Figure 4c"},{"@id":"https://doi.org/10.17182/hepdata.159754.v1/t9","@type":"Dataset","description":"The differential $\\mathrm{Z}\\rightarrow 4\\ell$ decay rate $d\\Gamma / dm_{234}$ defined in Section 8.2. This distribution has been unfolded and scaled...","name":"Figure 4d"},{"@id":"https://doi.org/10.17182/hepdata.159754.v1/t10","@type":"Dataset","description":"The differential $\\mathrm{Z}\\rightarrow 4\\ell$ decay rate $d\\Gamma / d\\beta$ defined in Section 8.2. This distribution has been unfolded and scaled...","name":"Figure 5a"},{"@id":"https://doi.org/10.17182/hepdata.159754.v1/t11","@type":"Dataset","description":"The differential $\\mathrm{Z}\\rightarrow 4\\ell$ decay rate $d\\Gamma / d\\alpha_{\\mathrm{Z_1}}$ defined in Section 8.2. This distribution has been unfolded and scaled...","name":"Figure 5b"},{"@id":"https://doi.org/10.17182/hepdata.159754.v1/t12","@type":"Dataset","description":"The differential $\\mathrm{Z}\\rightarrow 4\\ell$ decay rate $d\\Gamma / d\\alpha_{\\mathrm{Z_2}}$ defined in Section 8.2. This distribution has been unfolded and scaled...","name":"Figure 5c"},{"@id":"https://doi.org/10.17182/hepdata.159754.v1/t13","@type":"Dataset","description":"The differential $\\mathrm{Z}\\rightarrow 4\\ell$ decay rate $d\\Gamma / d\\cos\\theta_{\\mathrm{Z_1}}$ defined in Section 8.2. This distribution has been unfolded and scaled...","name":"Figure 5d"},{"@id":"https://doi.org/10.17182/hepdata.159754.v1/t14","@type":"Dataset","description":"The differential $\\mathrm{Z}\\rightarrow 4\\ell$ decay rate $d\\Gamma / d\\cos\\theta_{\\mathrm{Z_2}}$ defined in Section 8.2. This distribution has been unfolded and scaled...","name":"Figure 5e"},{"@id":"https://doi.org/10.17182/hepdata.159754.v1/t15","@type":"Dataset","description":"Distribution of $\\sin\\phi$ for the sum of all $4\\ell$ channels. The simulations are normalized according to the predicted cross sections...","name":"Figure 6a"},{"@id":"https://doi.org/10.17182/hepdata.159754.v1/t16","@type":"Dataset","description":"Distribution of $\\sin\\phi$ for the $4\\mu$ channel. The simulations are normalized according to the predicted cross sections and the integrated...","name":"Figure 6b"},{"@id":"https://doi.org/10.17182/hepdata.159754.v1/t17","@type":"Dataset","description":"Distribution of $\\sin\\phi$ for the $2\\mu 2\\mathrm{e}$ channel. The simulations are normalized according to the predicted cross sections and the...","name":"Figure 6c"},{"@id":"https://doi.org/10.17182/hepdata.159754.v1/t18","@type":"Dataset","description":"Distribution of $\\sin\\phi$ for the $4\\mathrm{e}$ channel. The simulations are normalized according to the predicted cross sections and the integrated...","name":"Figure 6d"},{"@id":"https://doi.org/10.17182/hepdata.159754.v1/t19","@type":"Dataset","description":"Exclusion contour at 95% CL for a BSM scalar boson U that couples only to electrons. This contour shows the...","name":"Figure 7a scalar"},{"@id":"https://doi.org/10.17182/hepdata.159754.v1/t20","@type":"Dataset","description":"Exclusion contour at 95% CL for a BSM vector boson U that couples only to electrons. This contour shows the...","name":"Figure 7a vector"},{"@id":"https://doi.org/10.17182/hepdata.159754.v1/t21","@type":"Dataset","description":"Exclusion contour at 95% CL for a BSM scalar boson U that couples only to muons. This contour shows the...","name":"Figure 7b scalar"},{"@id":"https://doi.org/10.17182/hepdata.159754.v1/t22","@type":"Dataset","description":"Exclusion contour at 95% CL for a BSM vector boson U that couples only to muons. This contour shows the...","name":"Figure 7b vector"},{"@id":"https://doi.org/10.17182/hepdata.159754.v1/t23","@type":"Dataset","description":"Exclusion contour at 95% CL for a BSM scalar boson U that couples equally to electrons and muons. This contour...","name":"Figure 7c scalar"},{"@id":"https://doi.org/10.17182/hepdata.159754.v1/t24","@type":"Dataset","description":"Exclusion contour at 95% CL for a BSM vector boson U that couples equally to electrons and muons. This contour...","name":"Figure 7c vector"},{"@id":"https://doi.org/10.17182/hepdata.159754.v1/t25","@type":"Dataset","description":"Exclusion contour at 95% CL for a BSM vector boson U that couples only to muons. This contour shows the...","name":"Figure 7d"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins3159175?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/159754"}],"inLanguage":"en","name":"Studies of Z $\\to$ 4$\\ell$ decays in proton-proton collisions at $\\sqrt{s}$ = 8 and 13 TeV","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins3159175?version=1","version":1}