Elliptic flow of charm and strange hadrons in high-multiplicity pPb collisions at $\sqrt{s_{_\mathrm{NN}}} =$ 8.16 TeV

The collaboration
Phys.Rev.Lett. 121 (2018) 082301, 2018.

Abstract
The elliptic azimuthal anisotropy coefficient ($v_2$) is measured for charm (D$^0$) and strange (K$_\mathrm{S}^0$, $\Lambda$, $\Xi^-$, and $\Omega^-$) hadrons, using a data sample of pPb collisions collected by the CMS experiment, at a nucleon-nucleon center-of-mass energy $\sqrt{s_{_\mathrm{NN}}} =$ 8.16 TeV. A significant positive $v_2$ signal from long-range azimuthal correlations is observed for all particle species in high-multiplicity pPb collisions. The measurement represents the first observation of possible long-range collectivity for open heavy flavor hadrons in small systems. The results suggest that charm quarks have a smaller $v_2$ than the lighter quarks, probably reflecting a weaker collective behavior. This effect is not seen in the larger PbPb collision system at $\sqrt{s_{_\mathrm{NN}}} =$ 5.02 TeV, also presented.

• #### Table 1

Data from Figure 2

10.17182/hepdata.83911.v1/t1

The elliptic flow, $v_{2}$, for $K^{0}_{S}$ as a function of $p_{T}$ in pPb collision at 8.16 TeV.

• #### Table 2

Data from Figure 2

10.17182/hepdata.83911.v1/t2

The elliptic flow, $v_{2}$, for $\Lambda$ as a function of $p_{T}$ in pPb collision at 8.16 TeV.

• #### Table 3

Data from Figure 2

10.17182/hepdata.83911.v1/t3

The elliptic flow, $v_{2}$, for $\Xi^{-}$ as a function of $p_{T}$ in pPb collision at 8.16 TeV.

• #### Table 4

Data from Figure 2

10.17182/hepdata.83911.v1/t4

The elliptic flow, $v_{2}$, for $\Omega^{-}$ as a function of $p_{T}$ in pPb collision at 8.16 TeV.

• #### Table 5

Data from Figure 2

10.17182/hepdata.83911.v1/t5

The elliptic flow, $v_{2}$, for $D^{0}$ mesons as a function of $p_{T}$ in pPb collision at 8.16 TeV.

• #### Table 6

Data from Figure 3

10.17182/hepdata.83911.v1/t6

The elliptic flow after correcting back-to-back jet contribution, $v_{2}^{sub}$, for $K^{0}_{S}$ as a function of $p_{T}$ in pPb collision at...

• #### Table 7

Data from Figure 3

10.17182/hepdata.83911.v1/t7

The elliptic flow after correcting back-to-back jet contribution, $v_{2}^{sub}$, for $\Lambda$ as a function of $p_{T}$ in pPb collision at...

• #### Table 8

Data from Figure 3

10.17182/hepdata.83911.v1/t8

The elliptic flow after correcting back-to-back jet contribution, $v_{2}^{sub}$, for $\Xi^{-}$ as a function of $p_{T}$ in pPb collision at...

• #### Table 9

Data from Figure 3

10.17182/hepdata.83911.v1/t9

The elliptic flow after correcting back-to-back jet contribution, $v_{2}^{sub}$, for $\Omega^{-}$ as a function of $p_{T}$ in pPb collision at...

• #### Table 10

Data from Figure 3

10.17182/hepdata.83911.v1/t10

The elliptic flow after correcting back-to-back jet contribution, $v_{2}^{sub}$, for $D^{0}$ mesons as a function of $p_{T}$ in pPb collision...

• #### Table 11

Data from Figure 3

10.17182/hepdata.83911.v1/t11

The elliptic flow per constituent quark after correcting back-to-back jet contribution, $v_{2}^{sub}/n_{q}$, for $K^{0}_{S}$ as a function of transverse kinetic...

• #### Table 12

Data from Figure 3

10.17182/hepdata.83911.v1/t12

The elliptic flow per constituent quark after correcting back-to-back jet contribution, $v_{2}^{sub}/n_{q}$, for $\Lambda$ as a function of transverse kinetic...

• #### Table 13

Data from Figure 3

10.17182/hepdata.83911.v1/t13

The elliptic flow per constituent quark after correcting back-to-back jet contribution, $v_{2}^{sub}/n_{q}$, for $\Xi^{-}$ as a function of transverse kinetic...

• #### Table 14

Data from Figure 3

10.17182/hepdata.83911.v1/t14

The elliptic flow per constituent quark after correcting back-to-back jet contribution, $v_{2}^{sub}/n_{q}$, for $\Omega^{-}$ as a function of transverse kinetic...

• #### Table 15

Data from Figure 3

10.17182/hepdata.83911.v1/t15

The elliptic flow per constituent quark after correcting back-to-back jet contribution, $v_{2}^{sub}/n_{q}$, for $D^{0}$ meson as a function of transverse...

• #### Table 16

Data from Figure 3

10.17182/hepdata.83911.v1/t16

The elliptic flow after correcting back-to-back jet contribution, $v_{2}^{sub}$, for $K^{0}_{S}$ as a function of $p_{T}$ in PbPb collision at...

• #### Table 17

Data from Figure 3

10.17182/hepdata.83911.v1/t17

The elliptic flow after correcting back-to-back jet contribution, $v_{2}^{sub}$, for $\Lambda$ as a function of $p_{T}$ in PbPb collision at...

• #### Table 18

Data from Figure 3

10.17182/hepdata.83911.v1/t18

The elliptic flow after correcting back-to-back jet contribution, $v_{2}^{sub}$, for $\Xi^{-}$ as a function of $p_{T}$ in PbPb collision at...

• #### Table 19

Data from Figure 3

10.17182/hepdata.83911.v1/t19

The elliptic flow after correcting back-to-back jet contribution, $v_{2}^{sub}$, for $\Omega^{-}$ as a function of $p_{T}$ in PbPb collision at...

• #### Table 20

Data from Figure 3

10.17182/hepdata.83911.v1/t20

The elliptic flow per constituent quark after correcting back-to-back jet contribution, $v_{2}^{sub}/n_{q}$, for $K^{0}_{S}$ as a function of transverse kinetic...

• #### Table 21

Data from Figure 3

10.17182/hepdata.83911.v1/t21

The elliptic flow per constituent quark after correcting back-to-back jet contribution, $v_{2}^{sub}/n_{q}$, for $\Lambda$ as a function of transverse kinetic...

• #### Table 22

Data from Figure 3

10.17182/hepdata.83911.v1/t22

The elliptic flow per constituent quark after correcting back-to-back jet contribution, $v_{2}^{sub}/n_{q}$, for $\Xi^{-}$ as a function of transverse kinetic...

• #### Table 23

Data from Figure 3

10.17182/hepdata.83911.v1/t23

The elliptic flow per constituent quark after correcting back-to-back jet contribution, $v_{2}^{sub}/n_{q}$, for $\Omega^{-}$ as a function of transverse kinetic...

• #### Table 24

Data from Figure 3

10.17182/hepdata.83911.v1/t24

The elliptic flow per constituent quark after correcting back-to-back jet contribution, $v_{2}^{sub}/n_{q}$, for $D^{0}$ meson as a function of transverse...