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arXiv 1201.0680hep-exnucl-ex
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ALICE实验中μ子前向跟踪器的可行性研究

Feasibility Study for a Muon Forward Tracker in the ALICE Experiment

Antonio Uras, Laure Marie Massacrier

摘要:

ALICE是欧洲核子研究中心大型强子对撞机(CERN LHC)的一项实验,致力于研究重离子碰撞中的夸克胶子等离子体。2017年的升级计划设想对ALICE子探测器进行改进。Muon Forward Tracker(MFT)是鉴于这种升级而提出的一项建议,其动机是克服Muon Spectrometer固有限制的可能性,以及为整个ALICE物理学进行普遍感兴趣的新测量的可能性。测量单μ子和双μ子的偏移将允许解开开魅($cτ\sim 150 μ$ m)和美($cτ\sim 500 μ$ m)的产生。由于其跟踪能力,MFT将允许提高共振的质量分辨率,以更好地分离$ρ/ω$和$ϕ$、$J/ψ$和$ψ'$以及$-$到较低程度的$-$ $Υ$族共振。此外,它将有助于拒绝来自π介子和K介子衰变的大部分μ介子,提高信号与背景的比率。为了评估这种升级的可行性,在AliRoot框架内模拟了由五个硅平面组成的设置。在这份报告中,我们提出了在低多重性环境中的MFT性能的初步结果。

英文摘要:

ALICE is the experiment dedicated to the study of the quark gluon plasma in heavy-ion collisions at the CERN LHC. Improvements of ALICE sub-detectors are envisaged for the upgrade plans of year 2017. The Muon Forward Tracker (MFT) is a proposal in view of this upgrade, motivated both by the possibility to overcome the intrinsic limitations of the Muon Spectrometer, and by the possibility to perform new measurements of general interest for the whole ALICE physics. The measurement of the offset of single muons and dimuons will permit to disentangle open charm ($cτ\sim 150 μ$m) and beauty ($cτ\sim 500 μ$m) production. The MFT, thanks to its tracking capabilities, will allow to improve the mass resolution of the resonances for a better separation between $ρ/ω$ and $ϕ$, $J/ψ$ and $ψ'$, and $-$ to a lesser extent $-$ $Υ$ family resonances. In addition, it will help to reject a large fraction of muons coming from pion and kaon decays, improving the signal over background ratio. In order to evaluate the feasibility of this upgrade, a setup composed by five silicon planes was simulated within the AliRoot framework. In this report, we present preliminary results on the MFT performances in a low-multiplicity environment.

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