Simulation results of dE/dx analysis in ALICE ITS

The particle identification by using dE/dx analysis in the ALICE silicon Inner Tracking System was studied by simulations. Correction procedures were considered and used to improve charge collection and resolution. Particle identification efficiencies and contamination rates depending in function of momentum were obtained by the probability weight calculation for each particle species (pi&plusmn;, K&plusmn;, p/anti-p). <P> List of figures <UL> <LI>Figure 1 <A HREF="qpik_p500.eps">Charge distributions for pi and K in the momentum interval (470/530) MeV/c (the different distributions are explained in the text)</A> <LI>Figure 2 <A HREF="qkpr_p880.eps">Charge distributions for K and protons in the momentum interval (830/930) MeV/c (the different distributions are described in the text)</A> <LI>Figure 3 <A HREF="dedx_its.eps">Energy loss - momentum scatter plot for four silicon layers of ALICE ITS and for different particles (e, pi, K, p)</A> <LI>Figure 4 <A HREF="pid_sum.eps">Momentum distributions for <I>pi&plusmn;(a), K&plusmn;(b)</I>, protons (<I>c</I> and <I>d</I> for cut-1 and cut-2, see text). Solid lines - generated distributions, dashed line - obtained after ITS simulation and PID procedure (see text), dotted lines - contamination (see text) </A>