Artigo de periodico

Medium modification of the shape of small-radius jets in central Pb-Pb collisions at √sNN = 2.76 TeV (2018)

• Authors:
  • Acharya, S
  • Bregant, Marco
  • Conti, Camila de
  • Degenhardt, Hermann Franz
  • Domenicis Gimenez, Diogenes
  • Figueredo, Marcel Araujo Silva
  • Jahnke, Cristiane
  • Lagana Fernandes, Caio
  • Matuoka, Paula Fernanda Toledo
  • Munhoz, Marcelo Gameiro
  • Luz, Hugo Natal da
  • Silva, Antonio Carlos Oliveira da
  • Suaide, Alexandre Alarcon do Passo
  • Zanoli, Henrique José Correia
• USP affiliated authors: BREGANT, MARCO - IF ; MUNHOZ, MARCELO GAMEIRO - IF ; SUAIDE, ALEXANDRE ALARCON DO PASSO - IF
• Unidade: IF
• Subjects: COLISÕES DE ÍONS PESADOS RELATIVÍSTICOS; REAÇÕES NUCLEARES
• Keywords: HEAVY ION EXPERIMENTS
• Agências de fomento:
  • Financiado pelo CNPq
  • Financiado pela FINEP
  • Financiado pela FAPESP
• Language: Inglês
• Abstract: We present the measurement of a new set of jet shape observables for track-based jets in central Pb-Pb collisions at sNN−−−√=2.76 TeV. The set of jet shapes includes the first radial moment or angularity, g; the momentum dispersion, pTD; and the difference between the leading and sub-leading constituent track transverse momentum, LeSub. These observables provide complementary information on the jet fragmentation and can constrain different aspects of the theoretical description of jet-medium interactions. The jet shapes were measured for a small resolution parameter R = 0.2 and were fully corrected to particle level. The observed jet shape modifications indicate that in-medium fragmentation is harder and more collimated than vacuum fragmentation as obtained by PYTHIA calculations, which were validated with the measurements of the jet shapes in proton-proton collisions at s√=7 TeV. The comparison of the measured distributions to templates for quark and gluon-initiated jets indicates that in-medium fragmentation resembles that of quark jets in vacuum. We further argue that the observed modifications are not consistent with a totally coherent energy loss picture where the jet loses energy as a single colour charge, suggesting that the medium resolves the jet structure at the angular scales probed by our measurements (R = 0.2). Furthermore, we observe that small-R jets can help to isolate purely energy loss effects from other effects that contribute to the modifications of the jet shower in medium such as the correlated background or medium response.
• Imprenta:
  • Publisher place: Bristol
  • Date published: 2018
• Source:
  • Título: Journal of High Energy Physics
  • ISSN: 0370-2693
  • Volume/Número/Paginação/Ano: v. 2018, n. 139, p. 1-30, 2018


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• ABNT

  ACHARYA, S et al. Medium modification of the shape of small-radius jets in central Pb-Pb collisions at √sNN = 2.76 TeV. Journal of High Energy Physics, v. 2018, n. 139, p. 1-30, 2018Tradução . . Disponível em: https://link.springer.com/article/10.1007*2FJHEP10*282018*29139#citeas. Acesso em: 23 jan. 2026.

• APA

  Acharya, S., Bregant, M., Conti, C. de, Degenhardt, H. F., Domenicis Gimenez, D., Figueredo, M. A. S., et al. (2018). Medium modification of the shape of small-radius jets in central Pb-Pb collisions at √sNN = 2.76 TeV. Journal of High Energy Physics, 2018( 139), 1-30. Recuperado de https://link.springer.com/article/10.1007*2FJHEP10*282018*29139#citeas

• NLM

  Acharya S, Bregant M, Conti C de, Degenhardt HF, Domenicis Gimenez D, Figueredo MAS, Jahnke C, Lagana Fernandes C, Matuoka PFT, Munhoz MG, Luz HN da, Silva ACO da, Suaide AA do P, Zanoli HJC. Medium modification of the shape of small-radius jets in central Pb-Pb collisions at √sNN = 2.76 TeV [Internet]. Journal of High Energy Physics. 2018 ; 2018( 139): 1-30.[citado 2026 jan. 23 ] Available from: https://link.springer.com/article/10.1007*2FJHEP10*282018*29139#citeas

• Vancouver

  Acharya S, Bregant M, Conti C de, Degenhardt HF, Domenicis Gimenez D, Figueredo MAS, Jahnke C, Lagana Fernandes C, Matuoka PFT, Munhoz MG, Luz HN da, Silva ACO da, Suaide AA do P, Zanoli HJC. Medium modification of the shape of small-radius jets in central Pb-Pb collisions at √sNN = 2.76 TeV [Internet]. Journal of High Energy Physics. 2018 ; 2018( 139): 1-30.[citado 2026 jan. 23 ] Available from: https://link.springer.com/article/10.1007*2FJHEP10*282018*29139#citeas

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