The ITS3 detector and physics reach of the LS3 ALICE Upgrade

arXiv - PHYS - Instrumentation and Detectors Pub Date : 2024-09-03 DOI:arxiv-2409.01866

Chun-Zheng Wangfor the ALICE Collaboration

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引用次数: 0

Abstract

During Large Hadron Collider (LHC) Long Shutdown 3 (LS3) (2026-28), the ALICE experiment is replacing its inner-most three tracking layers by a new detector, Inner Tracking System 3. It will be based on newly developed wafer-scale monolithic active pixel sensors, which are bent into truly cylindrical layers and held in place by light mechanics made from carbon foam. Unprecedented low values of material budget (per layer) and closeness to interaction point (19 mm) lead to a factor two improvement in pointing resolutions from very low $p_\text{T}$ (O(100MeV/$c$)), achieving, for example, 20 ${\mu}$m and 15 ${\mu}$m in the transversal and longitudinal directions, respectively, for 1 GeV/c primary charged pions. After a successful R\&D phase 2019-2023, which demonstrated the feasibility of this innovational detector, the final sensor and mechanics are being developed right now. This contribution will briefly review the conceptual design and the main R&D achievements, as well as the current activities and road to completion and installation. It concludes with a projection of the improved physics performance, in particular for heavy-flavour hadrons, as well as for thermal dielectrons, that will come into reach with this new detector installed.

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ITS3探测器和LS3 ALICE升级版的物理覆盖范围

在大型强子对撞机（LHC）长期关闭 3（LS3）（2026-28 年）期间，ALICE 实验将用一个新的探测器--内跟踪系统 3--取代其最内层的三个跟踪层。它将基于新开发的晶圆级有源像素传感器，这些传感器被弯曲成真正的圆柱形层，并由碳泡沫制成的光机械装置固定到位。史无前例的低材料预算值（每层）和与相互作用点的接近度（19 毫米）使得从非常低的p_\text{T}$（O(100MeV/$c$)）开始的指向分辨率提高了两倍，例如，在横向和纵向上分别达到了 20${\mu}$m 和 15${\mu}$m，适用于 1GeV/c 的原初带电离子。2019-2023年研发阶段的成功证明了这一创新探测器的可行性，目前正在开发最终的传感器和机械装置。本报告将简要回顾该探测器的概念设计和主要研发成果，以及当前的活动和完工安装之路。最后，还将对安装了这种新探测器后将达到的更高物理性能进行预测，特别是对重味中子和热介子的物理性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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arXiv - PHYS - Instrumentation and Detectors

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