TY - JOUR
T1 - Measurement of Suppression of Large-Radius Jets and Its Dependence on Substructure in Pb+Pb Collisions at sNN=5.02 TeV with the ATLAS Detector
AU - ATLAS Publications
AU - Clark, Philip James
AU - Farrington, Sinead
AU - Gao, Yanyan
AU - Leonidopoulos, Christos
AU - Martin, Victoria Jane
AU - Mijovic, Liza
AU - Wynne, Benjamin
AU - Alderweireldt, Sara
AU - Carter, T.M.
AU - Gonzalez Andana, R.Y.
AU - Hasib, A.
AU - Parrish, V.A.
AU - Pender, E.A.
AU - Qiu, T.
AU - Takeva, E.P.
AU - Themistokleous, N.
AU - Villhauer, E.M.
AU - Zaid, E.
PY - 2023/10/23
Y1 - 2023/10/23
N2 - This letter presents a measurement of the nuclear modification factor of large-radius jets in βπ πβ’π=5.02ββTeV Pb+Pb collisions by the ATLAS experiment. The measurement is performed using 1.72ββnbβ1 and 257ββpbβ1 of Pb+Pb and πβ’π data, respectively. The large-radius jets are reconstructed with the anti-ππ‘ algorithm using a radius parameter of π
=1.0, by reclustering anti-ππ‘ π
=0.2 jets, and are measured over the transverse momentum (ππ) kinematic range of 158<ππ<1000ββGeV and absolute pseudorapidity |π¦|<2.0. The large-radius jet constituents are further reclustered using the ππ‘ algorithm in order to obtain the splitting parameters, βπ12 and Ξβ’π
12, which characterize the transverse momentum scale and angular separation for the hardest splitting in the jet, respectively. The nuclear modification factor, π
π΄β’π΄, obtained by comparing the Pb+Pb jet yields to those in πβ’π collisions, is measured as a function of jet transverse momentum (ππ) and βπ12 or Ξβ’π
12. 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 π
π΄β’π΄ 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.
AB - This letter presents a measurement of the nuclear modification factor of large-radius jets in βπ πβ’π=5.02ββTeV Pb+Pb collisions by the ATLAS experiment. The measurement is performed using 1.72ββnbβ1 and 257ββpbβ1 of Pb+Pb and πβ’π data, respectively. The large-radius jets are reconstructed with the anti-ππ‘ algorithm using a radius parameter of π
=1.0, by reclustering anti-ππ‘ π
=0.2 jets, and are measured over the transverse momentum (ππ) kinematic range of 158<ππ<1000ββGeV and absolute pseudorapidity |π¦|<2.0. The large-radius jet constituents are further reclustered using the ππ‘ algorithm in order to obtain the splitting parameters, βπ12 and Ξβ’π
12, which characterize the transverse momentum scale and angular separation for the hardest splitting in the jet, respectively. The nuclear modification factor, π
π΄β’π΄, obtained by comparing the Pb+Pb jet yields to those in πβ’π collisions, is measured as a function of jet transverse momentum (ππ) and βπ12 or Ξβ’π
12. 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 π
π΄β’π΄ 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.
U2 - 10.1103/PhysRevLett.131.172301
DO - 10.1103/PhysRevLett.131.172301
M3 - Article
SN - 0031-9007
VL - 131
SP - 1
EP - 22
JO - Physical Review Letters
JF - Physical Review Letters
IS - 17
M1 - 172301
ER -