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Transverse Energy with the PHENIX MPC

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

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Transverse Energy with the PHENIX MPC

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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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