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arXiv 1804.09083nucl-exhep-ex
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在$\mathbf{\sqrt{s_{\rm NN}}}= 5.02$ TeV上测量铅-铅碰撞中D $^0$、D PDMATHAAB、D PDMATHAAC和D $^+_{\rm s}$的产生

Measurement of D$^0$, D$^+$, D$^{*+}$ and D$^+_{\rm s}$ production in Pb-Pb collisions at $\mathbf{\sqrt{s_{\rm NN}}}= 5.02$ TeV

ALICE Collaboration

摘要:

本文报道了在质量中心能量为每个核子-核子对$\sqrt{s_{\rm NN}}=5.02$ TeV的Pb-Pb碰撞中,在中心度为0- 10%、30-50%和60- 80%的情况下,产生的瞬发D $^0$、D $^+$、D $^{*+}$和D $^+_{\rm s}$介子的测量结果.在中快度($|y|<0.5$)下测量了D介子产额作为横向动量($p_{\rm T}$)的函数。中心碰撞所涵盖的$p_{\rm T}$间隔是:D $^0$的$1<p_{\rm T}<50$ GeV/ $c$,D $^+$的$2<p_{\rm T}<50$ GeV/ $c$,D $^{*+}$的$3<p_{\rm T}<50$ GeV/ $c$,以及D $^+_{\rm s}$介子的$4<p_{\rm T}<16$ GeV/ $c$。非奇异D介子的核修正因子($R_{\rm AA}$)(DPDMATHABMM,DPDMATHABMN,DPDMATHABMO)在最中心碰撞中,当$p_{\rm T}$ = 6-10 GeV/ $c$时,其最小值约为0.2,与在$\sqrt{s_{\rm NN}}=2.76$ TeV下测量的结果在不确定度范围内是一致的.对于D-$^+_{\rm s}$介子,$R_{\rm AA}$的值比非奇异D介子的值大,但在不确定度范围内是相容的。在中心碰撞中,对于$p_{\rm T} > 8$ GeV/ $c$,非奇异D介子的平均$R_{\rm AA}$与带电粒子的平均$R_{\rm AA}$是相容的,而在较低的$p_{\rm T}$下,非奇异D介子的平均$R_{\rm AA}$较大.奇异和非奇异D介子的核修改因子也比较了不同的实现中的介质能量损失的理论模型。

英文摘要:

We report measurements of the production of prompt D$^0$, D$^+$, D$^{*+}$ and D$^+_{\rm s}$ mesons in Pb-Pb collisions at the centre-of-mass energy per nucleon-nucleon pair $\sqrt{s_{\rm NN}}=5.02$ TeV, in the centrality classes 0-10%, 30-50% and 60-80%. The D-meson production yields are measured at mid-rapidity ($|y|<0.5$) as a function of transverse momentum ($p_{\rm T}$). The $p_{\rm T}$ intervals covered in central collisions are: $1<p_{\rm T}<50$ Gev/$c$ for D$^0$, $2<p_{\rm T}<50$ GeV/$c$ for D$^+$, $3<p_{\rm T}<50$ GeV/$c$ for D$^{*+}$, and $4<p_{\rm T}<16$ GeV/$c$ for D$^+_{\rm s}$ mesons. The nuclear modification factors ($R_{\rm AA}$) for non-strange D mesons (D$^0$, D$^+$, D$^{*+}$) show minimum values of about 0.2 for $p_{\rm T}$ = 6-10 GeV/$c$ in the most central collisions and are compatible within uncertainties with those measured at $\sqrt{s_{\rm NN}}=2.76$ TeV. For D$^+_{\rm s}$ mesons, the values of $R_{\rm AA}$ are larger than those of non-strange D mesons, but compatible within uncertainties. In central collisions the average $R_{\rm AA}$ of non-strange D mesons is compatible with that of charged particles for $p_{\rm T} > 8$ GeV/$c$, while it is larger at lower $p_{\rm T}$. The nuclear modification factors for strange and non-strange D mesons are also compared to theoretical models with different implementations of in-medium energy loss.

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