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PID in Large Detector

This research discusses the improvements in K-p separation achieved through dE/dx measurements in a large detector setup, focusing on momentum ranges of 2 GeV/c to approximately 30 GeV/c. The study highlights the significance of fine-grained Time-of-Flight (TOF) counters and scintillator pads with SiPM readouts in effectively distinguishing particle types within jets. By utilizing a TOF resolution of under 100 ps in combination with a dE/dx resolution of 4.5%, seamless K-p separation can be attained, which is crucial for enhancing jet energy resolution and identifying D0/D0-bar particles.

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PID in Large Detector

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  1. PID in Large Detector 2004.11.5 Y. Sugimoto

  2. K-p separation by dE/dx of TPC • > 2s separation 2< p<~30 GeV/c, p<0.9 GeV/c • Gap in 0.9<p<2 GeV/c sdE/dx=4.5% K-p Separation (s) Momentum (GeV/c)

  3. Effect of TOF • Large detector has long track path length (L>2m) and favorable for TOF • TOF counter with fine granularity is necessary to separate particles in a jet • Scintillator pads with SiPM readout (?) • Resistive plate counter: STAR TOF s~80ps

  4. Combined performance sTOF=100ps L=2.1m K-p Separation (s) Momentum (GeV/c)

  5. Summary • TOF counter with s<100ps combined with TPC of <4.5% dE/dx resolution gives seamless K-p separation > 2s below ~30GeV/c • What is the physics case? • D0/D0-bar identification by K+/K- ID • Improvement of jet energy resolution by assigning correct mass (???) • What else ? • What is the importance of filling the gap?

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