Abstract (data abstract)

The azimuthal anisotropy of inclusive muons produced in p--Pb collisions at $\sqrt{s_\mathrm{NN}}$ = 8.16 TeV is measured by using the ALICE detector at the LHC. The measurement of the second-order Fourier coefficient of the particle azimuthal distribution, $v_2$, is performed as a function of transverse momentum $p_{\rm T}$ in the 0$-$20% high-multiplicity interval at both forward ($2.03 < y_{\mathrm{cms}} < 3.53$) and backward ($-4.46 < y_{\mathrm{cms}} < -2.96$) rapidities over a wide $p_{\rm T}$ range, $0.5 < p_{\rm T} < 10$ GeV/$c$, in which a dominant contribution of muons from heavy-flavour hadron decays is expected at $p_{\rm T} > 2$ GeV/$c$. The $v_2$ coefficient of inclusive muons is extracted using two different techniques, namely two-particle cumulants, used for the first time for heavy-flavour measurements, and forward--central two-particle correlations. A positive $v_2$ is measured at both forward and backward rapidities with a significance larger than 4.7$\sigma$ and 7.6$\sigma$, respectively, in the interval $2<p_{\rm T}<6$ GeV/$c$. The comparisons between the results and theoretical calculations can impose new constraints on the theoretical interpretations of the origin of the collective behaviour in small collision systems.

Table1_1

Data from figure 3 (1/2 left pannel), blue open circles

10.17182/hepdata.138430.v1/t1

Inclusive muon $v_{2}^{\mu}$ as a function of $p_{\mathrm{T}}$ is measured by two-particle correlation method at forward rapidities in high-multiplicity (0$-$20%)...
Table1_2

Data from figure 3 (2/2 left pannel), red full squares

10.17182/hepdata.138430.v1/t2

Inclusive muon $v_{2}^{\mu}$ as a function of $p_{\mathrm{T}}$ is measured by two-particle cumulant method at forward rapidities in high-multiplicity (0$-$20%)...
Table1_3

Data from figure 3 (1/2 right pannel), blue open circles

10.17182/hepdata.138430.v1/t3

Inclusive muon $v_{2}^{\mu}$ as a function of $p_{\mathrm{T}}$ is measured by two-particle correlation method at backward rapidities in high-multiplicity (0$-$20%)...
Table1_4

Data from figure 3 (2/2 right pannel), red full squares

10.17182/hepdata.138430.v1/t4

Inclusive muon $v_{2}^{\mu}$ as a function of $p_{\mathrm{T}}$ is measured by two-particle cumulant method at backward rapidities in high-multiplicity (0$-$20%)...
Table2_1

Data from figure 4 (1/2 top left pannel), blue full circles

10.17182/hepdata.138430.v1/t5

Inclusive muon $v_{2}^{\mu}$ as a function of $p_{\mathrm{T}}$ is measured by two-particle cumulant method at forward rapidities in high-multiplicity (0$-$20%)...
Table2_2

Data from figure 4 (2/2 top left pannel), green open diamonds

10.17182/hepdata.138430.v1/t6

Inclusive muon $v_{2}^{\mu}$ as a function of $p_{\mathrm{T}}$ is measured by two-particle cumulant method at forward rapidities in high-multiplicity (0$-$20%)...
Table2_3

Data from figure 4 (1/2 top right pannel), blue full circles

10.17182/hepdata.138430.v1/t7

Inclusive muon $v_{2}^{\mu}$ as a function of $p_{\mathrm{T}}$ is measured by two-particle cumulant method at backward rapidities in high-multiplicity (0$-$20%)...
Table2_4

Data from figure 4 (2/2 top right pannel), green open diamonds

10.17182/hepdata.138430.v1/t8

Inclusive muon $v_{2}^{\mu}$ as a function of $p_{\mathrm{T}}$ is measured by two-particle cumulant method at backward rapidities in high-multiplicity (0$-$20%)...
Table2_5

Data from figure 4 (1/2 bottom left pannel), blue full circles

10.17182/hepdata.138430.v1/t9

Inclusive muon $v_{2}^{\mu}$ as a function of $p_{\mathrm{T}}$ is measured by two-particle correlation method at forward rapidities in high-multiplicity (0$-$20%)...
Table2_6

Data from figure 4 (2/2 bottom left pannel), green open diamonds

10.17182/hepdata.138430.v1/t10

Inclusive muon $v_{2}^{\mu}$ as a function of $p_{\mathrm{T}}$ is measured by two-particle correlation method at forward rapidities in high-multiplicity (0$-$20%)...
Table2_7

Data from figure 4 (1/2 bottom right pannel), blue full circles

10.17182/hepdata.138430.v1/t11

Inclusive muon $v_{2}^{\mu}$ as a function of $p_{\mathrm{T}}$ is measured by two-particle corrrelation method at backward rapidities in high-multiplicity (0$-$20%)...
Table2_8

Data from figure 4 (2/2 bottom right pannel), green open diamonds

10.17182/hepdata.138430.v1/t12

Inclusive muon $v_{2}^{\mu}$ as a function of $p_{\mathrm{T}}$ is measured by two-particle correlation method at backward rapidities in high-multiplicity (0$-$20%)...

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