{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.165283.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/3140573"}}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"CMS Collaboration"},"creator":{"@type":"Organization","name":"CMS Collaboration"},"datePublished":"2026","description":"The first measurement of coherent $\u03a5$(1S) meson photoproduction off heavy nuclei is performed using ultraperipheral lead-lead collisions collected by the CMS experiment at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The nuclear gluonic structure is probed at a nucleon momentum fraction of order $x$$\\sim$ 10$^{-3}$, determined by the kinematics of the process. Owing to the large $\u03a5$(1S) mass, the measurement reaches the highest scale accessible so far through coherent vector-meson photoproduction, $\u03bc^2$ = 22.4 GeV$^2$, where nonlinear quantum chromodynamics effects are expected to be minimal. In the $\u03a5$(1S) rapidity range $\\lvert y\\rvert$$\\lt$ 1, the ratio of the measured photoproduction cross section to a baseline model prediction that neglects nuclear effects is $S_{\u03a5\\text{(1S)}}$ = 0.25 $\\pm$ 0.06 (stat) $\\pm$ 0.02 (syst), thereby demonstrating nuclear suppression in this process. Expressed in terms of a nuclear gluon suppression factor, the result yields $R_\\text{g}^\\text{Pb}$($x$$\\approx$ 10$^{-3}$, $\u03bc^2$ = 22.4 GeV$^2$) = 0.55 $\\pm$ 0.12 (stat) $\\pm$ 0.02 (syst). The measured $R_\\text{g}^\\text{Pb}$ is only slightly larger than the values previously reported for coherent $\u03d5$ photoproduction, despite the probed $\u03bc^2$ differing by approximately two orders of magnitude.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.165283.v1/t1","@type":"Dataset","description":"The differential coherent $\\Upsilon(1S)$ photoproduction cross section and its ratio to the impulse approximation as a function of rapidity, measured...","name":"Table 1"},{"@id":"https://doi.org/10.17182/hepdata.165283.v1/t2","@type":"Dataset","description":"The total coherent $\\Upsilon(1S)$ photoproduction cross section as a function of photon-nuclear center-of-mass energy per nucleon $W_{\\gamma \\mathrm{N}}^{\\mathrm{Pb}}$, measured in...","name":"Table 2"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins3140573?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/165283"}],"inLanguage":"en","name":"Observation of nuclear suppression in coherent $\u03a5$(1S) photoproduction off heavy nuclei at the LHC","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins3140573?version=1","version":1}