Sprecher
Beschreibung
It has been a challenge to understand the experimental data on both the nuclear modification factor and elliptic flow of $D^0$ mesons in $p−Pb$ collisions at LHC energies. In this $\rm{work^{[1]}}$, we study these observables with an improved multi-phase transport model. After including the Cronin effect (or transverse momentum broadening) and independent fragmentation for charm quarks, we provide the first simultaneous description of the $D^0$ meson $R_{pA}$ and $v_2$ data at $p_T$ ≤ 8 GeV/c. The model also provides a reasonable description of the $D^0$ meson $p_T$ spectra and the low-$p_T$ (below ~1.5 GeV/c) charged hadron spectra, $R_{pA}$ and $v_2$. We find that both parton scatterings and the Cronin effect are important for the $D^0$ meson $R_{pA}$, while parton scatterings are mostly responsible for the $D^0$ meson $v_2$. Therefore, it is crucial to include the Cronin effect for the simultaneous description of the $D^0$ meson $R_{pA}$ and $v_2$. Since the Cronin effect is expected to grow with the system size, this work also implies that it could be important for heavy hadrons in large systems.
Affiliation
1Department of Physics, East Carolina University, Greenville, North Carolina 27858, USA
2China University of Geosciences, Wuhan 430074, China
3Key Laboratory of Quark & Lepton Physics (MOE) and Institute of Particle Physics,
Central China Normal University, Wuhan 430079, China
| Experiment/Theory | Theory/Phenomenology |
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