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First measurements of N-subjettiness in central Pb-Pb collisions at p root s(NN)=2.76 TeV

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F21%3A00547017" target="_blank" >RIV/68378271:_____/21:00547017 - isvavai.cz</a>

  • Alternative codes found

    RIV/61389005:_____/21:00547017 RIV/68407700:21340/21:00352407

  • Result on the web

    <a href="https://doi.org/10.1007/JHEP10(2021)003" target="_blank" >https://doi.org/10.1007/JHEP10(2021)003</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1007/JHEP10(2021)003" target="_blank" >10.1007/JHEP10(2021)003</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    First measurements of N-subjettiness in central Pb-Pb collisions at p root s(NN)=2.76 TeV

  • Original language 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 root s = 7 TeV and root s(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 <= p(T,jet) <= 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 increment R, are also performed in pp collisions at root s = 7 TeV for inclusive jets. These results are compared with PYTHIA calculations at root 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.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • OECD FORD branch

    10303 - Particles and field physics

Result continuities

  • Project

    Result was created during the realization of more than one project. More information in the Projects tab.

  • Continuities

    P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Others

  • Publication year

    2021

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Journal of High Energy Physics

  • ISSN

    1029-8479

  • e-ISSN

    1029-8479

  • Volume of the periodical

    2021

  • Issue of the periodical within the volume

    10

  • Country of publishing house

    US - UNITED STATES

  • Number of pages

    34

  • Pages from-to

    003

  • UT code for WoS article

    000703983100001

  • EID of the result in the Scopus database

    2-s2.0-85116808987