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Measurement of suppression of large-radius jets and its dependence on substructure in Pb+Pb collisions at βˆšπ‘ π‘β’π‘=5.02  TeV with the ATLAS Detector

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This letter presents a measurement of the nuclear modification factor of large-radius jets in βˆšπ‘ π‘β’π‘ =5.02  TeV Pb+Pb collisions by the ATLAS experiment. The measurement is performed using 1.72  nbβˆ’1 and 257  pbβˆ’1 of Pb+Pb and 𝑝⁒𝑝 data, respectively. The large-radius jets are reconstructed with the a...

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Main Authors: Aad, Georges (Author) , Baltes, Lisa Marie (Author) , Bartels, Falk (Author) , Castillo, Florencia Luciana (Author) , Czurylo, Marta (Author) , Rio, Fernando del (Author) , Dittmeier, Sebastian (Author) , Dunford, Monica (Author) , Franchino, Silvia (Author) , Junkermann, Thomas (Author) , Klassen, Martin (Author) , Mkrtchyan, Tigran (Author) , Ott, Philipp (Author) , Rassloff, Damir Fabrice (Author) , Rodriguez Bosca, Sergi (Author) , Sauer, Christof (Author) , Schöning, André (Author) , Schultz-Coulon, Hans-Christian (Author) , Sothilingam, Varsiha (Author) , Stamen, Rainer (Author) , Starovoitov, Pavel (Author) , Vigani, Luigi (Author) , Weber, Sebastian (Author) , Wessels, Martin (Author) , Zinßer, Joachim (Author)
Corporate Author: ATLAS Collaboration (Author)
Format: Article (Journal) Editorial
Language:English
Published: 23 October 2023
In: Physical review letters
Year: 2023, Volume: 131, Issue: 17, Pages: 1-22
ISSN:1079-7114
DOI:10.1103/PhysRevLett.131.172301
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevLett.131.172301
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.131.172301
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Author Notes:G. Aad et al. (ATLAS Collaboration*)
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Summary:This letter presents a measurement of the nuclear modification factor of large-radius jets in βˆšπ‘ π‘β’π‘ =5.02  TeV Pb+Pb collisions by the ATLAS experiment. The measurement is performed using 1.72  nbβˆ’1 and 257  pbβˆ’1 of Pb+Pb and 𝑝⁒𝑝 data, respectively. The large-radius jets are reconstructed with the anti-π‘˜π‘‘ algorithm using a radius parameter of 𝑅 =1.0, by reclustering anti-π‘˜π‘‘ 𝑅 =0.2 jets, and are measured over the transverse momentum (𝑝𝑇) kinematic range of 158<𝑝𝑇<1000  GeV and absolute pseudorapidity |𝑦| <2.0. The large-radius jet constituents are further reclustered using the π‘˜π‘‘ algorithm in order to obtain the splitting parameters, βˆšπ‘‘12 and Δ⁒𝑅12, which characterize the transverse momentum scale and angular separation for the hardest splitting in the jet, respectively. The nuclear modification factor, 𝑅𝐴⁒𝐴, obtained by comparing the Pb+Pb jet yields to those in 𝑝⁒𝑝 collisions, is measured as a function of jet transverse momentum (𝑝𝑇) and βˆšπ‘‘12 or Δ⁒𝑅12. A significant difference in the quenching of large-radius jets having single subjet and those with more complex substructure is observed. Systematic comparison of jet suppression in terms of 𝑅𝐴⁒𝐴 for different jet definitions is also provided. Presented results support the hypothesis that jets with hard internal splittings lose more energy through quenching and provide a new perspective for understanding the role of jet structure in jet suppression.
Item Description:*ATLAS Collaboration: G. Aad, L.M. Baltes, F. Bartels, F.L. Castillo, M.M. Czurylo, S. Dittmeier, F. Del Rio, M. Dunford, S. Franchino, T. Junkermann, M. Klassen, T. Mkrtchyan, P.S. Ott, D.F. Rassloff, S. Rodriguez Bosca, C. Sauer, A. Schoening, H.-C. Schultz-Coulon, V. Sothilingam, R. Stamen, P. Starovoitov, L. Vigani, S.M. Weber, M. Wessels, J. Zinsser [und 2845 weitere Personen]
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Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.131.172301

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