Final published version
Licence: CC BY: Creative Commons Attribution 4.0 International License
Research output: Contribution to Journal/Magazine βΊ Journal article βΊ peer-review
Research output: Contribution to Journal/Magazine βΊ Journal article βΊ peer-review
}
TY - JOUR
T1 - Azimuthal Angle Correlations of Muons Produced via Heavy-Flavor Decays in 5.02 TeV Pb+Pb and pp Collisions with the ATLAS Detector
AU - The ATLAS collaboration
AU - Ali, H.M.J.
AU - Barton, A.E.
AU - Bertram, I.A.
AU - Borissov, G.
AU - Bouhova-Thacker, E.V.
AU - Ferguson, R.A.M.
AU - Ferrando, James
AU - Fox, H.
AU - Hagan, A.I.
AU - Henderson, R.C.W.
AU - Jones, R.W.L.
AU - Kartvelishvili, V.
AU - Love, P.A.
AU - Marshall, E.J.
AU - Meng, L.
AU - Muenstermann, D.
AU - Ribaric, N.
AU - Rybacki, K.
AU - Smizanska, M.
AU - Spinali, S.
AU - Wharton, A.M.
PY - 2024/5/17
Y1 - 2024/5/17
N2 - Angular correlations between heavy quarks provide a unique probe of the quark-gluon plasma created in ultrarelativistic heavy-ion collisions. Results are presented of a measurement of the azimuthal angle correlations between muons originating from semileptonic decays of heavy quarks produced in 5.02 TeV Pb+Pb and πβ’π collisions at the LHC. The muons are measured with transverse momenta and pseudorapidities satisfying ππT>4ββGeV and |ππ|<2.4, respectively. The distributions of azimuthal angle separation Ξβ’π for muon pairs having pseudorapidity separation |Ξβ’π|>0.8, are measured in different Pb+Pb centrality intervals and compared to the same distribution measured in πβ’π collisions at the same center-of-mass energy. Results are presented separately for muon pairs with opposite-sign charges, same-sign charges, and all pairs. A clear peak is observed in all Ξβ’π distributions at Ξβ’πβΌπ, consistent with the parent heavy-quark pairs being produced via hard-scattering processes. The widths of that peak, characterized using Cauchy-Lorentz fits to the Ξβ’π distributions, are found to not vary significantly as a function of Pb+Pb collision centrality and are similar for πβ’π and Pb+Pb collisions. This observation will provide important constraints on theoretical descriptions of heavy-quark interactions with the quark-gluon plasma.
AB - Angular correlations between heavy quarks provide a unique probe of the quark-gluon plasma created in ultrarelativistic heavy-ion collisions. Results are presented of a measurement of the azimuthal angle correlations between muons originating from semileptonic decays of heavy quarks produced in 5.02 TeV Pb+Pb and πβ’π collisions at the LHC. The muons are measured with transverse momenta and pseudorapidities satisfying ππT>4ββGeV and |ππ|<2.4, respectively. The distributions of azimuthal angle separation Ξβ’π for muon pairs having pseudorapidity separation |Ξβ’π|>0.8, are measured in different Pb+Pb centrality intervals and compared to the same distribution measured in πβ’π collisions at the same center-of-mass energy. Results are presented separately for muon pairs with opposite-sign charges, same-sign charges, and all pairs. A clear peak is observed in all Ξβ’π distributions at Ξβ’πβΌπ, consistent with the parent heavy-quark pairs being produced via hard-scattering processes. The widths of that peak, characterized using Cauchy-Lorentz fits to the Ξβ’π distributions, are found to not vary significantly as a function of Pb+Pb collision centrality and are similar for πβ’π and Pb+Pb collisions. This observation will provide important constraints on theoretical descriptions of heavy-quark interactions with the quark-gluon plasma.
U2 - 10.1103/PhysRevLett.132.202301
DO - 10.1103/PhysRevLett.132.202301
M3 - Journal article
VL - 132
JO - Physical review letters
JF - Physical review letters
SN - 1079-7114
IS - 20
M1 - 202301
ER -