Sprecher
Beschreibung
The interaction of heavy quarks with the quark-gluon plasma (QGP) affects their azimuthal distribution and $p_{\rm{T}}$ spectrum, hence measurement of azimuthal anisotropy coefficients ($v_n$) and nuclear modification factors ($R_{\rm{AA}}$) of heavy flavor hadrons turns out to be an important probe of the QGP. However, simultaneous modeling of $v_n$ and $R_{\rm{AA}}$ is still challenging. This talk reports the first nonprompt $\rm{D}^0$ measurements of the azimuthal anisotropy elliptic ($v_2$) and triangular ($v_3$) coefficients in large systems, using !PbPb collisions at $\sqrt{s_\mathrm{NN}}= 5.02$ TeV, collected with the CMS apparatus. The measurements are performed as a function of transverse momentum, spanning 1--30 GeV /c, in three centrality classes, from central to midcentral collisions. Compared to the prompt $\rm{D}^0$ results, the nonprompt $D^0$ $v_2$ flow coefficients are systematically lower and show less dependence on $p_{\rm{T}}$ and centrality. An indication of non-zero $v_3$ coefficient of the nonprompt $\rm{D}^0$ is observed. A wide pT range enables the study of various flow generation mechanisms, like diffusion at low $p_{\rm{T}}$ and path-dependent parton energy loss at high $p_{\rm{T}}$. In addition, measurements of both prompt and nonprompt $D^0$ mesons cross sections in PbPb and pp collisions, as well as $R_{\rm{AA}}$, will be shown. The results will be compared to theoretical predictions.
Affiliation
CMS
| Experiment/Theory | CMS |
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