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System-size dependence of open-heavy-flavor production in nucleus-nucleus collisions at $\sqrt{s_{_{NN}}}$=200 GeV

Abstract : The PHENIX Collaboration at the Relativistic Heavy Ion Collider has measured open heavy flavor production in Cu$+$Cu collisions at $\sqrt{s_{_{NN}}}$=200 GeV through the measurement of electrons at midrapidity that originate from semileptonic decays of charm and bottom hadrons. In peripheral Cu$+$Cu collisions an enhanced production of electrons is observed relative to $p$$+$$p$ collisions scaled by the number of binary collisions. In the transverse momentum range from 1 to 5 GeV/$c$ the nuclear modification factor is $R_{AA}$$\sim$1.4. As the system size increases to more central Cu$+$Cu collisions, the enhancement gradually disappears and turns into a suppression. For $p_T>3$ GeV/$c$, the suppression reaches $R_{AA}$$\sim$0.8 in the most central collisions. The $p_T$ and centrality dependence of $R_{AA}$ in Cu$+$Cu collisions agree quantitatively with $R_{AA}$ in $d+$Au and Au$+$Au collisions, if compared at similar number of participating nucleons $\langle N_{\rm part} \rangle$.
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http://hal.in2p3.fr/in2p3-00879551
Contributor : Dominique Girod <>
Submitted on : Monday, November 4, 2013 - 11:29:23 AM
Last modification on : Wednesday, September 16, 2020 - 4:08:48 PM

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A. Adare, Laurent Aphecetche, E. T. Atomssa, H. Delagrange, O. Drapier, et al.. System-size dependence of open-heavy-flavor production in nucleus-nucleus collisions at $\sqrt{s_{_{NN}}}$=200 GeV. Physical Review C, American Physical Society, 2014, 90, pp.034903. ⟨10.1103/PhysRevC.90.034903⟩. ⟨in2p3-00879551⟩

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