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Exploring Transverse Energy with the PHENIX Muon Piston Calorimeter: Future Plans and Performance

This presentation by Brett Fadem of Muhlenberg College for the PHENIX Collaboration dives into transverse energy measurement using the Muon Piston Calorimeter (MPC) at RHIC. It covers the motivation for exploring new kinematic ranges, the definition and significance of transverse energy, and the MPC's design and performance characteristics. The talk also highlights ongoing research to analyze data from Au+Au collisions, aiming to study event-by-event fluctuations and possible critical points. Future plans for data collection and experiments at the 200 GeV/c run are also discussed.

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Exploring Transverse Energy with the PHENIX Muon Piston Calorimeter: Future Plans and Performance

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  1. Transverse Energy with the PHENIX MPC Brett Fadem of Muhlenberg College for the PHENIX Collaboration

  2. Overview • The goal • Transverse energy for a new kinematic range • Definition • Motivation • The main tool • The Muon Piston Calorimeter (MPC) • Kinematic coverage • Performance • Plans for the Future

  3. Definition of Transverse Energy • θi is the polar angle • Eiis • the kinetic energy for nucleons • Total energy for all other particles

  4. Motivations • A new kinematic region for ET at RHIC • A necessary first step toward fluctuations • Search for critical point • See, for example, M. Stephanov, K. Rajagopal, E. Shuryak, Phys.Rev.Lett. 81 (1998) 4816-4819

  5. Location of MPC stations ~220 cm from vertex Good coverage!

  6. North Location South Location During installation Pre-installation

  7. North Station South Station 220 PbWO4 Crystals 196 PbWO4 Crystals 3.1 < |η|< 3.8 3.1 < |η|< 3.7

  8. PbWO4 Crystals and Avalanche Photodiodes APD Holder PbWO4 Crystal PreAmp

  9. Avalanche Photodiodes • Hamamatsu S8864-55 • 5 × 5 mm square, large area • Gain ~50

  10. New PHENIX Calorimeter Acceptance ZDC FC FC MPC ZDC MPC PbGl PbGl / PbSc FCAL FCAL

  11. PHENIX Au+Au √sNN = 130 GeV Phys. Rev. Lett. Volume 87, Number 5, 30 July, 2001 |η| ≤ 0.38

  12. STAR Au+Au, √SNN = 200 GeV arXiv:nucl-ex/0407003v1 2 Jul 2004 Phys. Rev. C70 (2004) 054906 0 < η ≤ 1

  13. Au+Au, √SNN = 200 GeV, Detector Performance

  14. MPC π0 from Run 6 p+p data • Shower Reconstruction Using Shower Shape Fits All Pairs Mixed Events Background subtracted • Photon Pair Cuts • Pair Energy > 8 GeV • Asymmetry |E1-E2|/|E1+E2| < 0.6 • Noisy towers • Width ~ 20 MeV Reconstruction of π0 in Au+Au data is plausible for peripheral Collisions

  15. MIP Peak MPC Minimum Ionizing Peak • Energy Scale Set by MIP • Confirmed with π0, η peaks • Peak corresponds to ~ 240 MeV

  16. Fluctuations in Forward Direction? • Event by Event Fluctuations in mean PT and mean ET in √sNN = 130 GeV Au+Au Collisions • K. Adcox et al., PHENIX Collaboration, Phys.Rev. C66 (2002) 024901 • No significant non-random fluctuations observed at central rapidities • Maybe in the forward direction we’ll get a different answer

  17. Plans for the Future • RHIC 2006/2007 Run 7 Au+Au at 200 GeV/c • 2.9 Billion minimum bias events are available • Continuing work on π0 peak, and calibrations • Using all towers • Tower by tower • Systematic study of hadronic contribution

  18. Acknowledgements • Joshua Adams, Undergraduate at Muhlenberg College • Mickey Chiu, BNL Physics • National Science Foundation

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