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arXiv 1111.0763nucl-ex
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在$\sqrt{s_{NN}}$ = 2.76 TeV的铅-铅碰撞中用ALICE探测器确定的带电强子的横动量谱

Transverse momentum spectra of identified charged hadrons with the ALICE detector in Pb--Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV

Roberto Preghenella

摘要:

利用ALICE实验测量了在$|y| < 0.5$上进行的Pb-Pb碰撞中快度带电强子产生。用\emph{dE/dx}和\emph{time-of-flight}粒子识别技术测量了$π^{\pm}$、$K^{\pm}$、$p$和$\bar{p}$的横动量谱,π介子的横动量谱从100 MeV/c到3 GeV/c,K介子的横动量谱从200 MeV/c到2 GeV/c,质子和反质子的横动量谱从300 MeV/c到3 GeV/c。带电强子的产生产额和粒子比的初步结果报告作为$p_{T}$和碰撞中心的函数。最后,结果进行了讨论的流体动力学启发的模型,并与已发表的RHIC数据在金-金碰撞在$\sqrt{s_{\rm NN}} = \rm 200 GeV$和预测的大型强子对撞机。

英文摘要:

The measurement of identified charged-hadron production at mid-rapidity ($|y| < 0.5$) performed with the ALICE experiment is presented for Pb--Pb collisions at $\sqrt{s_{\rm NN}} = \rm .76 TeV$. The transverse momentum spectra of $π^{\pm}$, $K^{\pm}$, $p$ and $\bar{p}$ are measured from 100 MeV/c up to 3 GeV/c for pions, from 200 MeV/c up to 2 GeV/c for kaons and from 300 MeV/c up to 3 GeV/c for protons and antiprotons using the \emph{dE/dx} and the \emph{time-of-flight} particle-identification techniques. Preliminary results on charged hadron production yields and particle ratios are reported as a function of $p_{T}$ and collision centrality. Finally, the results are discussed in terms of hydrodynamics-inspired models and compared with published RHIC data in Au--Au collisions at $\sqrt{s_{\rm NN}} = \rm 200 GeV$ and predictions for the LHC.

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