{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.111055.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/1862792"}},{"@id":"https://doi.org/10.1007/JHEP10(2021)003","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"ALICE Collaboration"},"creator":{"@type":"Organization","name":"ALICE Collaboration"},"datePublished":"2021","description":"The ALICE Collaboration reports the first fully-corrected measurements of the $N$-subjettiness observable for track-based jets in heavy-ion collisions. This study is performed using data recorded in pp and Pb--Pb collisions at centre-of-mass energies of $\\sqrt{s}= 7$ TeV and $\\sqrt{s_{\\rm NN}} = 2.76$ TeV, respectively. In particular the ratio of 2-subjettiness to 1-subjettiness, $\\tau_{2}/\\tau_{1}$, which is sensitive to the rate of two-pronged jet substructure, is presented. Energy loss of jets traversing the strongly interacting medium in heavy-ion collisions is expected to change the rate of two-pronged substructure relative to vacuum.  The results are presented for jets with a resolution parameter of $R = 0.4$ and charged jet transverse momentum of $40 \\leq p_{\\rm T,\\rm jet} \\leq 60$ GeV/$c$, which constitute a larger jet resolution and lower jet transverse momentum interval than previous measurements in heavy-ion collisions. This has been achieved by utilising a semi-inclusive hadron-jet coincidence technique to suppress the larger jet combinatorial background in this kinematic region. No significant modification of the $\\tau_{2}/\\tau_{1}$ observable for track-based jets in Pb--Pb collisions is observed relative to vacuum PYTHIA6 and PYTHIA8 references at the same collision energy. The measurements of $\\tau_{2}/\\tau_{1}$, together with the splitting aperture angle $\\Delta R$, are also performed in pp collisions at $\\sqrt{s}=7$ TeV for inclusive jets. These results are compared with PYTHIA calculations at $\\sqrt{s}=7$ TeV, in order to validate the model as a vacuum reference for the Pb--Pb centre-of-mass energy. The PYTHIA references for $\\tau_{2}/\\tau_{1}$ are shifted to larger values compared to the measurement in pp collisions. This hints at a reduction in the rate of two-pronged jets in Pb--Pb collisions compared to pp collisions.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.111055.v1/t1","@type":"Dataset","description":"The $\\Delta R$ (with $k_{T}$) fully corrected data distributions for jetsin the jet transverse momentum range 40-60 GeV/c in pp...","name":"$\\Delta R$ with $k_{T}$ reclustering in pp"},{"@id":"https://doi.org/10.17182/hepdata.111055.v1/t2","@type":"Dataset","description":"The $\\Delta R$ (with C/A) fully corrected data distributions for jetsin the jet transverse momentum range 40-60 GeV/c in pp...","name":"$\\Delta R$ with CA reclustering in pp"},{"@id":"https://doi.org/10.17182/hepdata.111055.v1/t3","@type":"Dataset","description":"The $\\Delta R$ (with Soft Drop) fully corrected data distributions for jetsin the jet transverse momentum range 40-60 GeV/c in...","name":"$\\Delta R$ with Soft Drop in pp"},{"@id":"https://doi.org/10.17182/hepdata.111055.v1/t4","@type":"Dataset","description":"The $\\tau_{2}/\\tau_{1}$ (with $k_{T}$) fully corrected data distributions for jetsin the jet transverse momentum range 40-60 GeV/c in pp collisions","name":"$\\frac{\\tau_{2}}{\\tau_{1}}$ with $k_{T}$ reclustering in pp"},{"@id":"https://doi.org/10.17182/hepdata.111055.v1/t5","@type":"Dataset","description":"The $\\tau_{2}/\\tau_{1}$ (with C/A) fully corrected data distributions for jetsin the jet transverse momentum range 40-60 GeV/c in pp collisions","name":"$\\frac{\\tau_{2}}{\\tau_{1}}$ with CA reclustering in pp"},{"@id":"https://doi.org/10.17182/hepdata.111055.v1/t6","@type":"Dataset","description":"The $\\tau_{2}/\\tau_{1}$ (with Soft Drop) fully corrected data distributions for jetsin the jet transverse momentum range 40-60 GeV/c in pp...","name":"$\\frac{\\tau_{2}}{\\tau_{1}}$ with Soft Drop in pp"},{"@id":"https://doi.org/10.17182/hepdata.111055.v1/t7","@type":"Dataset","description":"The $\\tau_{2}/\\tau_{1}$ (with $k_{T}$) fully corrected data distributions for recoil jetsin the jet transverse momentum range 40-60 GeV/c in PbPb...","name":"$\\frac{\\tau_{2}}{\\tau_{1}}$ with $k_{T}$ reclustering in Pb-Pb"},{"@id":"https://doi.org/10.17182/hepdata.111055.v1/t8","@type":"Dataset","description":"The $\\tau_{2}/\\tau_{1}$ (with C/A) fully corrected data distributions for recoil jetsin the jet transverse momentum range 40-60 GeV/c in PbPb...","name":"$\\frac{\\tau_{2}}{\\tau_{1}}$ with CA reclustering in Pb-Pb"},{"@id":"https://doi.org/10.17182/hepdata.111055.v1/t9","@type":"Dataset","description":"The $\\tau_{2}/\\tau_{1}$ (with Soft Drop) fully corrected data distributions for recoil jetsin the jet transverse momentum range 40-60 GeV/c in...","name":"$\\frac{\\tau_{2}}{\\tau_{1}}$ with Soft Drop in Pb-Pb"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins1862792?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/111055"}],"inLanguage":"en","name":"First measurements of N-subjettiness in central Pb-Pb collisions at $ \\sqrt{s_{\\mathrm{NN}}} $ = 2.76 TeV","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins1862792?version=1","version":1}