Sub-leading flow modes in PbPb collisions at √sNN = 2.76 TeV from the HYDJET++ model
Abstract
Recent LHC results on the appearance of sub-leading flow modes in PbPb collisions at 2.76 TeV, related to initial-state fluctuations, are analyzed and interpreted within the HYDJET++ model. Using the newly introduced Principal Component Analysis (PCA) method applied to two-particle azimuthal correlations extracted from the model calculations, the leading and sub-leading flow modes are studied as a function of the transverse momentum (p(T)) over a wide centrality range. The leading modes of the elliptic (v(2)((1))) and triangular (v(3)((1))) flow calculated with the HYDJET++ model reproduce rather well the v(2){2} and v(3){2} coefficients measured experimentally using the two-particle correlations. Within the p(T) LT = 3 GeV/c range, where hydrodynamics dominates, the sub-leading flow effects are greatest at the highest p(T) of around 3 GeV/c. The sub-leading elliptic flow mode (v(2)((2))), which corresponds to the n = 2 harmonic, has a small non-zero value and slowly increases from cen...tral to peripheral collisions, while the sub-leading triangular flow mode (v(3)((2))), which corresponds to the n = 3 harmonic, is even smaller and does not depend on centrality. For n = 2, the relative magnitude of the effect measured with respect to the leading flow mode shows a shallow minimum for semi-central collisions and increases for very central and for peripheral collisions. For the n = 3 case, there is no centrality dependence. The sub-leading flow mode results obtained from the HYDJET++ model are in rather good agreement with the experimental measurements of the CMS Collaboration.
Keywords:
hydrodynamics flow / initial-state fluctuations / principal component analysis / HYDJET plusSource:
Chinese Physics C, 2017, 41, 7Funding / projects:
- High Energy Physics with the CMS Detector (RS-MESTD-Basic Research (BR or ON)-171019)
Collections
Institution/Community
VinčaTY - JOUR AU - Ćirković, Predrag AU - Devetak, Damir AU - Đorđević, Miloš AU - Milošević, Jovan AU - Stojanović, Milan PY - 2017 UR - https://vinar.vin.bg.ac.rs/handle/123456789/1652 AB - Recent LHC results on the appearance of sub-leading flow modes in PbPb collisions at 2.76 TeV, related to initial-state fluctuations, are analyzed and interpreted within the HYDJET++ model. Using the newly introduced Principal Component Analysis (PCA) method applied to two-particle azimuthal correlations extracted from the model calculations, the leading and sub-leading flow modes are studied as a function of the transverse momentum (p(T)) over a wide centrality range. The leading modes of the elliptic (v(2)((1))) and triangular (v(3)((1))) flow calculated with the HYDJET++ model reproduce rather well the v(2){2} and v(3){2} coefficients measured experimentally using the two-particle correlations. Within the p(T) LT = 3 GeV/c range, where hydrodynamics dominates, the sub-leading flow effects are greatest at the highest p(T) of around 3 GeV/c. The sub-leading elliptic flow mode (v(2)((2))), which corresponds to the n = 2 harmonic, has a small non-zero value and slowly increases from central to peripheral collisions, while the sub-leading triangular flow mode (v(3)((2))), which corresponds to the n = 3 harmonic, is even smaller and does not depend on centrality. For n = 2, the relative magnitude of the effect measured with respect to the leading flow mode shows a shallow minimum for semi-central collisions and increases for very central and for peripheral collisions. For the n = 3 case, there is no centrality dependence. The sub-leading flow mode results obtained from the HYDJET++ model are in rather good agreement with the experimental measurements of the CMS Collaboration. T2 - Chinese Physics C T1 - Sub-leading flow modes in PbPb collisions at √sNN = 2.76 TeV from the HYDJET++ model VL - 41 IS - 7 DO - 10.1088/1674-1137/41/7/074001 ER -
@article{ author = "Ćirković, Predrag and Devetak, Damir and Đorđević, Miloš and Milošević, Jovan and Stojanović, Milan", year = "2017", abstract = "Recent LHC results on the appearance of sub-leading flow modes in PbPb collisions at 2.76 TeV, related to initial-state fluctuations, are analyzed and interpreted within the HYDJET++ model. Using the newly introduced Principal Component Analysis (PCA) method applied to two-particle azimuthal correlations extracted from the model calculations, the leading and sub-leading flow modes are studied as a function of the transverse momentum (p(T)) over a wide centrality range. The leading modes of the elliptic (v(2)((1))) and triangular (v(3)((1))) flow calculated with the HYDJET++ model reproduce rather well the v(2){2} and v(3){2} coefficients measured experimentally using the two-particle correlations. Within the p(T) LT = 3 GeV/c range, where hydrodynamics dominates, the sub-leading flow effects are greatest at the highest p(T) of around 3 GeV/c. The sub-leading elliptic flow mode (v(2)((2))), which corresponds to the n = 2 harmonic, has a small non-zero value and slowly increases from central to peripheral collisions, while the sub-leading triangular flow mode (v(3)((2))), which corresponds to the n = 3 harmonic, is even smaller and does not depend on centrality. For n = 2, the relative magnitude of the effect measured with respect to the leading flow mode shows a shallow minimum for semi-central collisions and increases for very central and for peripheral collisions. For the n = 3 case, there is no centrality dependence. The sub-leading flow mode results obtained from the HYDJET++ model are in rather good agreement with the experimental measurements of the CMS Collaboration.", journal = "Chinese Physics C", title = "Sub-leading flow modes in PbPb collisions at √sNN = 2.76 TeV from the HYDJET++ model", volume = "41", number = "7", doi = "10.1088/1674-1137/41/7/074001" }
Ćirković, P., Devetak, D., Đorđević, M., Milošević, J.,& Stojanović, M.. (2017). Sub-leading flow modes in PbPb collisions at √sNN = 2.76 TeV from the HYDJET++ model. in Chinese Physics C, 41(7). https://doi.org/10.1088/1674-1137/41/7/074001
Ćirković P, Devetak D, Đorđević M, Milošević J, Stojanović M. Sub-leading flow modes in PbPb collisions at √sNN = 2.76 TeV from the HYDJET++ model. in Chinese Physics C. 2017;41(7). doi:10.1088/1674-1137/41/7/074001 .
Ćirković, Predrag, Devetak, Damir, Đorđević, Miloš, Milošević, Jovan, Stojanović, Milan, "Sub-leading flow modes in PbPb collisions at √sNN = 2.76 TeV from the HYDJET++ model" in Chinese Physics C, 41, no. 7 (2017), https://doi.org/10.1088/1674-1137/41/7/074001 . .