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arXiv 2202.00815nucl-ex
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在$\sqrt{s_{\rm NN}}$ = 5.02 TeV的Pb-Pb碰撞中通过非瞬发${\rm D}^{0}$介子测量美的产生

Measurement of beauty production via non-prompt ${\rm D}^{0}$ mesons in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV

ALICE Collaboration

摘要:

在LHC的ALICE实验中,在核子-核子质心能量为$\sqrt{s_{\rm NN}}=5.02~\mathrm{TeV}$的Pb-Pb碰撞中,测量了Beauty强子衰变产生非瞬发${\rm D}^{0}$介子的中快度($\left| y \right| < 0.5$).它们的核修饰因子($R_{\rm AA}$),首次测量到$0-10$ %和$30-50$ %中心性类中的$p_{\rm T}=1~\mathrm{GeV}/c$,表明在$0-10$ %中心Pb-Pb碰撞中,$p_{\rm T} > 5~\mathrm{GeV}/c$的显著抑制,高达约3倍。数据描述的模型,包括碰撞和辐射过程中的美夸克的能量损失的夸克胶子等离子体的计算,夸克重组除了作为一个强子化机制的碎片。在$0-10$ %中心Pb-Pb碰撞中,对于$p_{\rm T} > 4~\mathrm{GeV}/c$,非瞬发与瞬发${\rm D}^{0}$ -介子$R_{\rm AA}$之比大于1,正如模型所预测的那样,在夸克-胶子等离子体中,美夸克由于质量更大而比魅夸克损失更少的能量。

英文摘要:

The production of non-prompt ${\rm D}^{0}$ mesons from beauty-hadron decays was measured at midrapidity ($\left| y \right| < 0.5$) in Pb-Pb collisions at a nucleon-nucleon center-of-mass energy of $\sqrt{s_{\rm NN}}=5.02~\mathrm{TeV}$ with the ALICE experiment at the LHC. Their nuclear modification factor ($R_{\rm AA}$), measured for the first time down to $p_{\rm T}=1~\mathrm{GeV}/c$ in the $0-10$% and $30-50$% centrality classes, indicates a significant suppression, up to a factor of about three, for $p_{\rm T} > 5~\mathrm{GeV}/c$ in the $0-10$% central Pb-Pb collisions. The data are described by models that include both collisional and radiative processes in the calculation of beauty-quark energy loss in the quark-gluon plasma, and quark recombination in addition to fragmentation as a hadronisation mechanism. The ratio of the non-prompt to prompt ${\rm D}^{0}$-meson $R_{\rm AA}$ is larger than unity for $p_{\rm T} > 4~\mathrm{GeV}/c$ in the $0-10$% central Pb-Pb collisions, as predicted by models in which beauty quarks lose less energy than charm quarks in the quark-gluon plasma because of their larger mass.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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