Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2005-05-27
Nucl.Instrum.Meth.A558:419-429,2006
Physics
Nuclear Physics
Nuclear Experiment
19 pages, 22 figures, 3 tables, submitted to NIM A
Scientific paper
10.1016/j.nima.2005.11.251
Particle identification (PID) capabilities are studied by using the Time Projection Chamber (TPC) and a Time-Of-Flight (TOF) detector together at STAR. The identification capability of charged hadrons is greatly extended compared with that achieved by TPC and TOF separately. Particle spectra from p+p, d+Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV and Au+Au collisions at $\sqrt{s_{_{NN}}}=62.4$ GeV are used to develop the methods. The transverse momentum ($p_T$) ranges of $\pi$, and $p(\bar{p})$ identification are from $\sim0.3$ GeV/$c$ to $\sim10$ GeV/$c$. The high $p_T$ reach is limited by statistics in current data sets. An important conceptual advance was developed to identify electrons by using a combination of dE/dx in TPC and velocity information from the TOF detectors, which is important for future low-mass dilepton program at STAR.
Barannikova Olga
Dong Xin
Fisyak Yuri
Ruan Liangzhong
Shao Maxine
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