{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.154161.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/2896594"}},{"@id":"https://doi.org/10.1103/c9wp-5tq3","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"CMS Collaboration"},"creator":{"@type":"Organization","name":"CMS Collaboration"},"datePublished":"2025","description":"Bound states of charm and anticharm quarks, known as charmonia, have a rich spectroscopic structure that can be used to probe the dynamics of hadron production in high-energy hadron collisions. Here, the cross section ratio of excited ($\u03c8$(2S)) and ground state (J/$\u03c8$) vector mesons is measured as a function of the charged-particle multiplicity in proton-lead (pPb) collisions at a center-of-mass (CM) energy per nucleon pair of 8.16 TeV. The data corresponding to an integrated luminosity of 175 nb$^{-1}$ were collected using the CMS detector. The ratio is measured separately for prompt and nonprompt charmonia in the transverse momentum range 6.5 $\\lt$$p_\\text{T}$$\\lt$ 30 GeV and in four rapidity ranges spanning $-$2.865 $\\lt$$y_\\text{CM}$$\\lt$ 1.935. For the first time, a statistically significant multiplicity dependence of the prompt cross section ratio is observed in proton-nucleus collisions. There is no clear rapidity dependence in the ratio. The prompt measurements are compared with a theoretical model which includes interactions with nearby particles during the evolution of the system. These results provide additional constraints on hadronization models of heavy quarks in nuclear collisions.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.154161.v1/t1","@type":"Dataset","description":"Normalized $\\sigma_{\\psi(2S)}/\\sigma_{J/\\psi}$ in $6.5<p_T<30.0\\,GeV$ and $ -2.865 < y_{CM} < -2$ as functions of normalized $\\text{N}^{{\\text{corr.}}}_{\\text{track}}$","name":"Figure 1-top left."},{"@id":"https://doi.org/10.17182/hepdata.154161.v1/t2","@type":"Dataset","description":"Normalized $\\sigma_{\\psi(2S)}/\\sigma_{J/\\psi}$ in $6.5<p_T<30.0\\,GeV$ and $ -2 < y_{CM} < -1$ as functions of normalized $\\text{N}^{{\\text{corr.}}}_{\\text{track}}$","name":"Figure 1-top right."},{"@id":"https://doi.org/10.17182/hepdata.154161.v1/t3","@type":"Dataset","description":"Normalized $\\sigma_{\\psi(2S)}/\\sigma_{J/\\psi}$ in $6.5<p_T<30.0\\,GeV$ and $ -1 < y_{CM} < 1$ as functions of normalized $\\text{N}^{{\\text{corr.}}}_{\\text{track}}$","name":"Figure 1-bottom left."},{"@id":"https://doi.org/10.17182/hepdata.154161.v1/t4","@type":"Dataset","description":"Normalized $\\sigma_{\\psi(2S)}/\\sigma_{J/\\psi}$ in $6.5<p_T<30.0\\,GeV$ and $ 1 < y_{CM} < 1.935$ as functions of normalized $\\text{N}^{{\\text{corr.}}}_{\\text{track}}$","name":"Figure 1-bottom right."},{"@id":"https://doi.org/10.17182/hepdata.154161.v1/t5","@type":"Dataset","description":"Normalized $\\sigma_{\\psi(2S)}/\\sigma_{J/\\psi}$ in $6.5<p_T<30.0\\,GeV$ and $ -2.865 < y_{CM} < 1.935$ as functions of normalized $\\text{N}^{{\\text{corr.}}}_{\\text{track}}$","name":"Figure 2-right."},{"@id":"https://doi.org/10.17182/hepdata.154161.v1/t6","@type":"Dataset","description":"Normalized $\\sigma_{\\psi(2S)}/\\sigma_{J/\\psi}$ in $3.0<p_T<6.5\\,GeV$ and $ -2.865 < y_{CM} < -2 $ as functions of normalized $\\text{N}^{{\\text{corr.}}}_{\\text{track}}$","name":"Figure 4-left."},{"@id":"https://doi.org/10.17182/hepdata.154161.v1/t7","@type":"Dataset","description":"Normalized $\\sigma_{\\psi(2S)}/\\sigma_{J/\\psi}$ in $3.0<p_T<6.5\\,GeV$ and $ 1 < y_{CM} < 1.935 $ as functions of normalized $\\text{N}^{{\\text{corr.}}}_{\\text{track}}$","name":"Figure 4-right."}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins2896594?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/154161"}],"inLanguage":"en","name":"Observation of the charged-particle multiplicity dependence of $\\sigma_{\\psi(2S)}/\\sigma_{\\text{J}/\\psi}$ in pPb collisions at 8.16 TeV","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins2896594?version=1","version":1}