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Acharya, S, Adamova, D, Adler, A, Adolfsson, J, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU et al (show 1013 more authors) , Ahuja, I, Akbar, Z, Akindinov, A, Al-Turany, M, Alam, SN, Aleksandrov, D, Alessandro, B, Alfanda, HM, Alfaro Molina, R, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Angeletti, M, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshauser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badala, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Ball, M, Banerjee, D, Barbera, R, Barioglio, L, Barlou, M, Barnafoldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Alba, JL Bazo, Bearden, IG, Beattie, C, Belikov, I, Hechavarria, 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(2021)
First measurements of N-subjettiness in central Pb-Pb collisions at p root s(NN)=2.76 TeV.
JOURNAL OF HIGH ENERGY PHYSICS, 2021 (10).
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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 s√ = 7 TeV and sNN−−−√ = 2.76 TeV, respectively. In particular the ratio of 2-subjettiness to 1-subjettiness, τ2/τ1, 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 ≤ pT,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 τ2/τ1 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 τ2/τ1, together with the splitting aperture angle ∆R, are also performed in pp collisions at s√ = 7 TeV for inclusive jets. These results are compared with PYTHIA calculations at 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 τ2/τ1 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.