{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.146017.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/2741119"}},{"@id":"https://doi.org/10.1038/s41467-025-56200-6","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"CMS Collaboration"},"creator":{"@type":"Organization","name":"CMS Collaboration"},"datePublished":"2024","description":"Despite the f$_0$(980) hadron having been discovered half a century ago, the question about its quark content has not been settled: it might be an ordinary quark-antiquark ($\\mathrm{q\\bar{q}}$) meson, a tetraquark ($\\mathrm{q\\bar{q}q\\bar{q}}$) exotic state, a kaon-antikaon ($\\mathrm{K\\bar{K}}$) molecule, or a quark-antiquark-gluon ($\\mathrm{q\\bar{q}g}$) hybrid. This paper reports strong evidence that the f$_0$(980) state is an ordinary $\\mathrm{q\\bar{q}}$ meson, inferred from the scaling of elliptic anisotropies ($v_2$) with the number of constituent quarks ($n_\\mathrm{q}$), as empirically established using conventional hadrons in relativistic heavy ion collisions. The f$_0$(980) state is reconstructed via its dominant decay channel f$_0$(980) $\\to$$\u03c0^+\u03c0^-$, in proton-lead collisions recorded by the CMS experiment at the LHC, and its $v_2$ is measured as a function of transverse momentum ($p_\\mathrm{T}$). It is found that the $n_q$ = 2 ($\\mathrm{q\\bar{q}}$ state) hypothesis is favored over $n_q$ = 4 ($\\mathrm{q\\bar{q}q\\bar{q}}$ or $\\mathrm{K\\bar{K}}$ states) by 7.7, 6.3, or 3.1 standard deviations in the $p_\\mathrm{T}$$\\lt$ 10, 8, or 6 GeV/$c$ ranges, respectively, and over $n_\\mathrm{q}$ = 3 ($\\mathrm{q\\bar{q}g}$ hybrid state) by 3.5 standard deviations in the $p_\\mathrm{T}$$\\lt$ 8 GeV/$c$ range. This result represents the first determination of the quark content of the f$_0$(980) state, made possible by using a novel approach, and paves the way for similar studies of other exotic hadron candidates.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.146017.v1/t1","@type":"Dataset","description":"The elliptic flow, $v_{2}$, for $f_0(980)$ as a function of $p_{T}$ in pPb collision at 8.16 TeV.","name":"Table 1"},{"@id":"https://doi.org/10.17182/hepdata.146017.v1/t2","@type":"Dataset","description":"The elliptic flow after nonflow subtraction, $v_{2}^{sub}$, for $f_0(980)$ as a function of $p_{T}$ in pPb collision at 8.16 TeV.","name":"Table 2"},{"@id":"https://doi.org/10.17182/hepdata.146017.v1/t3","@type":"Dataset","description":"The elliptic flow after nonflow subtraction, $v_{2}^{sub}/2$, for $f_0(980)$ as a function of $/2$ in pPb collision at 8.16 TeV.","name":"Table 3"},{"@id":"https://doi.org/10.17182/hepdata.146017.v1/t4","@type":"Dataset","description":"The elliptic flow after nonflow subtraction, $v_{2}^{sub}/4$, for $f_0(980)$ as a function of $/4$ in pPb collision at 8.16 TeV.","name":"Table 4"},{"@id":"https://doi.org/10.17182/hepdata.146017.v1/t5","@type":"Dataset","description":"The elliptic flow after nonflow subtraction, $v_{2}^{sub}/2$, for $f_0(980)$ as a function of $/2$ in pPb collision at 8.16 TeV.","name":"Table 5"},{"@id":"https://doi.org/10.17182/hepdata.146017.v1/t6","@type":"Dataset","description":"The elliptic flow after nonflow subtraction, $v_{2}^{sub}/4$, for $f_0(980)$ as a function of $/4$ in pPb collision at 8.16 TeV.","name":"Table 6"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins2741119?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/146017"}],"inLanguage":"en","name":"Elliptic anisotropy measurement of the f$_0$(980) hadron in proton-lead collisions and evidence for its quark-antiquark composition","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins2741119?version=1","version":1}