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

The 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

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

• Table 2

Figure 2a

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

• Table 3

Figure 2c

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

• Table 4

Figure 2a

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

• Table 5

Figure 2c

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

• Table 6

Figure 2a

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

• Table 7

Figure 2c

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

• Table 8

Figure 2a

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

• Table 9

Figure 2c

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

• Table 10

Figure 2a

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$v_{4}$ 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

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

• Table 13

Figure 2c

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

• Table 14

Figure 3(a)

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

• Table 15

Figure 3(b)

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

• Table 16

Figure 3(a)

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

• Table 17

Figure 3(b)

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

• Table 18

Figure 3(a)

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

• Table 19

Figure 3(b)

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