标题： 用ALICE内跟踪系统识别的强子横动量谱 显示英文标题

标题： Transverse momentum spectra of hadrons identified with the ALICE Inner Tracking System

摘要： 内能跟踪系统是ALICE探测器中最靠近束流轴的探测器。 它由六层硅探测器组成：两层最内层的硅像素探测器（SPD）、两层中间的硅漂移探测器（SDD）和两层最外层的硅条形探测器（SSD）。 ITS可以用作独立的轨迹追踪器，以恢复时间投影室（TPC）未能重建的轨迹，并且可以用来重建低动量粒子的轨迹，动量从$p_{t}$ 降低到100 MeV/c。 ITS中的粒子识别是通过测量SDD和SSD层的能量损失信号来完成的。 ITS允许在低$p_{t}$ 的情况下扩展ALICE中心快速性区域中的带电粒子识别能力：可以在动量范围100 MeV/c $< p_{t} <$ 500 MeV/c 区分$\pi/K$，并在动量范围200 MeV/c $ < p_{t} <$ 800 MeV/c 区分$K/p$。 ITS 中强子的鉴别将被详细讨论，还将描述用于提取$p_{t}$ 谱的不同方法$\pi, K$ 和$p$。 显示英文摘要

摘要： The Inner Tracking System is the ALICE detector closest to the beam axis. It is composed of six layers of silicon detectors: two innermost layers of Silicon Pixel Detectors (SPD), two intermediate layers of Silicon Drift Detectors (SDD) and two outermost layers of Silicon Strip Detectors (SSD). The ITS can be used as a standalone tracker in order to recover tracks that are not reconstructed by the Time Projection Chamber (TPC) and to reconstruct low momentum particles with $p_{t}$ down to 100 MeV/c. Particle identification in the ITS is performed by measuring the energy loss signal in the SDD and SSD layers. The ITS allows to extend the charged particle identification capability in the ALICE central rapidity region at low $p_{t}$: it is possible to separate $\pi/K$ in the range 100 MeV/c $< p_{t} <$ 500 MeV/c and $K/p$ in the range 200 MeV/c $ < p_{t} <$ 800 MeV/c. The identification of hadron in the ITS will be discussed in detail, different methods used to extract the $p_{t}$ spectra of $\pi, K$ and $p$ will also be described.