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Flow dominance and factorization of transverse momentum correlations in Pb-Pb collisions at the LHC

The ALICE collaboration
Phys.Rev.Lett. 118 (2017) 162302, 2017

Abstract (data abstract)
CERN-LHC. ALICE Measurement of charged particles differential transverse momentum correlation function, $\Delta p_{\rm T}\Delta p_{\rm T}$, in Pb-Pb collisions at $\sqrt{s_{NN}}= 2.76$ TeV. The correlations are reported as a function of the relative pseudorapidity and azimuthal angle difference, $\Delta\varphi$. The $\Delta\varphi$ dependence is found to be largely independent of $\Delta\eta$ at $\Delta\eta > 0.9$. $\Delta p_{\rm T}\Delta p_{\rm T}$ exhibits a strong dependence on collision centrality that is qualitatively similar to that of number correlations, R2, previously reported. In 0-5% most central Pb--Pb collisions the two particle transverse momentum correlation function exhibits a cleartwo hump structure at the 'away-side', an indication of the dominance of triangular flow. Detailed comparison of R2 and $\Delta p_{\rm T}\Delta p_{\rm T}$ correlation functions utilizing Fourier decomposition show that the $\Delta p_{\rm T}\Delta p_{\rm T}$ correlations at $\Delta\eta > 0.9$ can be well reproduced by the flow ansatz, assuming that all the correlations are dominated by the anisotropic flow.

  • Table 1

    Figure 1b

    10.17182/hepdata.78231.v1/t1

    Projection of $P_{2}$ along $\Delta\varphi$ in 0-5% centrality in the range $|\Delta \eta| \geq$ 0.9

  • Table 2

    Figure 2a

    10.17182/hepdata.78231.v1/t2

    $v_{2}$ coefficients measured from $P_2$ for particle pairs in the range $0.2 \leq |\Delta\eta| \leq 0.9$.

  • Table 3

    Figure 2c

    10.17182/hepdata.78231.v1/t3

    $v_{2}$ coefficients measured from $P_2$ for particle pairs in the range $0.9 \leq |\Delta\eta| \leq 1.9$.

  • Table 4

    Figure 2a

    10.17182/hepdata.78231.v1/t4

    $v_{2}$ coefficients estimated from the flow ansatz in the range $0.2 \leq |\Delta\eta| \leq 0.9$.

  • Table 5

    Figure 2c

    10.17182/hepdata.78231.v1/t5

    $v_{2}$ coefficients estimated from the flow ansatz in the range $0.9 \leq |\Delta\eta| \leq 1.9$.

  • Table 6

    Figure 2a

    10.17182/hepdata.78231.v1/t6

    $v_{3}$ coefficients measured from $P_2$ for particle pairs in the range $0.2 \leq |\Delta\eta| \leq 0.9$.

  • Table 7

    Figure 2c

    10.17182/hepdata.78231.v1/t7

    $v_{3}$ coefficients measured from $P_2$ for particle pairs in the range $0.9 \leq |\Delta\eta| \leq 1.9$.

  • Table 8

    Figure 2a

    10.17182/hepdata.78231.v1/t8

    $v_{3}$ coefficients estimatEd from the flow ansatz in the range $0.2 \leq |\Delta\eta| \leq 0.9$.

  • Table 9

    Figure 2c

    10.17182/hepdata.78231.v1/t9

    $v_{3}$ coefficients estimatEd from the flow ansatz in the range $0.9 \leq |\Delta\eta| \leq 1.9$.

  • Table 10

    Figure 2a

    10.17182/hepdata.78231.v1/t10

    $v_{4}$ coefficients measured from $P_2$ for particle pairs in the range $0.2 \leq |\Delta\eta| \leq 0.9$.

  • Table 11

    Figure 2c

    10.17182/hepdata.78231.v1/t11

    $v_{4}$ coefficients measured from $P_2$ for particle pairs in the range $0.9 \leq |\Delta\eta| \leq 1.9$.

  • Table 12

    Figure 2a

    10.17182/hepdata.78231.v1/t12

    $v_{4}$ coefficients estimatEd from the flow ansatz in the range $0.2 \leq |\Delta\eta| \leq 0.9$.

  • Table 13

    Figure 2c

    10.17182/hepdata.78231.v1/t13

    $v_{4}$ coefficients estimatEd from the flow ansatz in the range $0.9 \leq |\Delta\eta| \leq 1.9$.

  • Table 14

    Figure 3(a)

    10.17182/hepdata.78231.v1/t14

    $v_{2}[P_2]$ coefficients vs pair separation in pseudorapidity in 0-5% centrality.

  • Table 15

    Figure 3(b)

    10.17182/hepdata.78231.v1/t15

    $v_{2}[R_2]$ coefficients vs pair separation in pseudorapidity in 0-5% centrality.

  • Table 16

    Figure 3(a)

    10.17182/hepdata.78231.v1/t16

    $v_{3}[P_2]$ coefficients vs pair separation in pseudorapidity in 0-5% centrality.

  • Table 17

    Figure 3(b)

    10.17182/hepdata.78231.v1/t17

    $v_{3}[R_2]$ coefficients vs pair separation in pseudorapidity in 0-5% centrality.

  • Table 18

    Figure 3(a)

    10.17182/hepdata.78231.v1/t18

    $v_{4}[P_2]$ coefficients vs pair separation in pseudorapidity in 0-5% centrality.

  • Table 19

    Figure 3(b)

    10.17182/hepdata.78231.v1/t19

    $v_{4}[R_2]$ coefficients vs pair separation in pseudorapidity in 0-5% centrality.

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