@article{3031962,
    title = "First measurements of N-subjettiness in central Pb-Pb collisions at p
root s(NN)=2.76 TeV",
    author = "Acharya, S. and Adamova, D. and Adler, A. and Adolfsson, J. and Rinella, and G. Aglieri and Agnello, M. and Agrawal, N. and Ahammed, Z. and Ahmad, S. and and Ahn, S. U. and Ahuja, I and Akbar, Z. and Akindinov, A. and and Al-Turany, M. and Alam, S. N. and Aleksandrov, D. and Alessandro, B. and and Alfanda, H. M. and Alfaro Molina, R. and Ali, B. and Ali, Y. and Alici, and A. and Alizadehvandchali, N. and Alkin, A. and Alme, J. and Alt, T. and and Altenkamper, L. and Altsybeev, I and Anaam, M. N. and Andrei, C. and and Andreou, D. and Andronic, A. and Angeletti, M. and Anguelov, V and and Antinori, F. and Antonioli, P. and Anuj, C. and Apadula, N. and and Aphecetche, L. and Appelshauser, H. and Arcelli, S. and Arnaldi, R. and and Arsene, I. C. and Arslandok, M. and Augustinus, A. and Averbeck, R. and and Aziz, S. and Azmi, M. D. and Badala, A. and Baek, Y. 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C. and and Zardoshti, N. and Zarochentsev, A. and Zavada, P. and Zaviyalov, N. and and Zbroszczyk, H. and Zhalov, M. and Zhang, S. and Zhang, X. and Zhang, Y. and and Zherebchevskii, V and Zhi, Y. and Zhou, D. and Zhou, Y. and Zhu, J. and and Zhu, Y. and Zichichi, A. and Zinovjev, G. and Zurlo, N. and ALICE and Collaboration",
    journal = "Journal of High Energy Physics",
    year = "2021",
    number = "10",
    publisher = "Springer-Verlag",
    issn = "1126-6708, 1029-8479",
    doi = "10.1007/JHEP10(2021)003",
    keywords = "Heavy Ion Experiments",
    abstract = "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."
}