Abstract (data abstract)

Measurements of the second Fourier harmonic coefficient ($v_2$) of the azimuthal distributions of prompt and nonprompt D$^{0}$ mesons produced in pp and pPb collisions are presented. Nonprompt D$^{0}$ mesons come from beauty hadron decays. The data samples are collected by the CMS experiment at nucleon-nucleon center-of-mass energies of 13 and 8.16 TeV, respectively. In high multiplicity pp collisions, $v_2$ signals for prompt charm hadrons are reported for the first time, and are found to be comparable to those for light-flavor hadron species over a transverse momentum ($p_{\mathrm{T}}$) range of 2-6 GeV. Compared at similar event multiplicities, the prompt D$^{0}$ meson $v_2$ values in pp and pPb collisions are similar in magnitude. The $v_2$ values for open beauty hadrons are extracted for the first time via nonprompt D$^{0}$ mesons in D$^{0}$ collisions. For $p_{\mathrm{T}}$ in the range of 2-5 GeV, the results suggest that $v_2$ for nonprompt D$^{0}$ mesons is smaller than that for prompt D$^{0}$ mesons. These new measurements indicate a positive charm hadron $v_2$ in pp collisions and suggest a mass dependence in $v_2$ between charm and beauty hadrons in the pPb system. These results provide insights into the origin of heavy-flavor quark collectivity in small systems.

Table 1

Data from figure 4

10.17182/hepdata.93883.v1/t1

Results of elliptic flow, corrected for short range correlations, for prompt neutral D mesons, as a function of transverse momenta...
Table 2

Data from figure 5 (upper)

10.17182/hepdata.93883.v1/t2

Results of elliptic flow, corrected for short range correlations, for prompt neutral D mesons, as a function of multiplicity for...
Table 3

Data from figure 5 (middle)

10.17182/hepdata.93883.v1/t3

Results of elliptic flow, corrected for short range correlations, for prompt neutral D mesons, as a function of multiplicity for...
Table 4

Data from figure 5 (lower)

10.17182/hepdata.93883.v1/t4

Results of elliptic flow, corrected for short range correlations, for prompt neutral D mesons, as a function of multiplicity for...
Table 5

Data from figure 5 (upper)

10.17182/hepdata.93883.v1/t5

Results of elliptic flow, corrected for short range correlations, for prompt neutral D mesons, as a function of multiplicity for...
Table 6

Data from figure 5 (middle)

10.17182/hepdata.93883.v1/t6

Results of elliptic flow, corrected for short range correlations, for prompt neutral D mesons, as a function of multiplicity for...
Table 7

Data from figure 5 (lower)

10.17182/hepdata.93883.v1/t7

Results of elliptic flow, corrected for short range correlations, for prompt neutral D mesons, as a function of multiplicity for...
Table 8

Data from figure 6

10.17182/hepdata.93883.v1/t8

Results of elliptic flow, corrected for short range correlations, for nonprompt neutral D mesons, as a function of transverse momenta...

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