{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.146015.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/2741115"}},{"@id":"https://doi.org/10.1103/PhysRevLett.133.142301","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"CMS Collaboration"},"creator":{"@type":"Organization","name":"CMS Collaboration"},"datePublished":"2024","description":"A search for partonic collective effects inside jets produced in proton-proton collisions is performed via correlation measurements of charged constituents using the CMS detector at the CERN LHC. The analysis uses data collected at a center-of-mass energy of $\\roots=13\\TeV$, corresponding to an integrated luminosity of $138~\\fbinv$. Jets are reconstructed with the anti-$\\kt$ algorithm with a distance parameter of 0.8 and are required to have transverse momentum greater than $550\\GeV$ and pseudorapidity $\\abs{\\eta}<1.6$. Two-particle correlations among the charged constituents within the jets are studied as functions of the particles azimuthal angle and pseudorapidity separations ($\\Delta\\phi^*$ and $\\Delta\\eta^*$) in a jet coordinate basis, where constituents $\\phi^*,\\eta^*$ are defined relative to the direction of the jet. The correlation functions are studied in classes of in-jet charged-particle multiplicity up to $N_{ch}^j\\approx100$. Fourier harmonics are extracted from long-range azimuthal correlation functions to characterize azimuthal anisotropy for $\\abs{\\Delta\\eta^*}>2$. For low-multiplicity jets, the long-range elliptic anisotropic harmonic, $v^*_2$, is observed to decrease with $N_{ch}^j$. This trend is well described by Monte Carlo event generators. However, a rising trend for $v^*_2$ emerges at $N_{ch}^j\\gtrsim80$, hinting at a possible onset of collective behavior, which is not reproduced by the models tested. This observation yields new insights into the dynamics of parton fragmentation processes in the vacuum.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.146015.v1/t1","@type":"Dataset","description":"Examples of two-particle angular correlations projected onto 1D $\\Delta\\phi^*$ for $\\abs{\\Delta\\eta^*}>2$.","name":"Figure 3a"},{"@id":"https://doi.org/10.17182/hepdata.146015.v1/t2","@type":"Dataset","description":"A continuous evolution of extracted two-particle Fourier coefficients $V^*_{N\\Delta}$ as a function of $N_{ch}^{j}$.","name":"Figure 3c"},{"@id":"https://doi.org/10.17182/hepdata.146015.v1/t3","@type":"Dataset","description":"The single-particle elliptic anisotropies $v^*_2$, as a function of $N_{ch}^{j}$.","name":"Figure 4"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins2741115?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/146015"}],"inLanguage":"en","name":"Observation of enhanced long-range elliptic anisotropies inside high-multiplicity jets in pp collisions at $\\sqrt{s}$ = 13 TeV","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins2741115?version=1","version":1}