1. Performance and Early Results from the Muon Tracking System of Rusty Towell of Abilene Christian University for the PHENIX collaboration First Joint Meeting of the Nuclear Physicists of the American and Japanese Physical Societies

2. Rusty Towell for the PHENIX collaboration

3. Rusty Towell for the PHENIX collaboration Oct 18, 2001APS/JPS Meeting Maui, Hawaii3 PHENIX at RHIC

4. Rusty Towell for the PHENIX collaboration Oct 18, 2001APS/JPS Meeting Maui, Hawaii4 Muon Arms Cover: 1.2 <  < 2.2 (South) 1.2 <  < 2.4 (North) almost complete azimuthal coverage Tracking with 3 stations of chambers in magnetic field Each of the station 3 octants are about 9 ft long and 9 ft wide. Muon Tracking System

5. Rusty Towell for the PHENIX collaboration Oct 18, 2001APS/JPS Meeting Maui, Hawaii5 Muon Tracking Parameters Physics Resolution Required : –Resolve  from  +  (  80 MeV/c 2 or 8 %) –Resolve J/  from  ´ (  110 MeV/c 2 or 4 %) –Resolve  from  ´ +  ´´ (  200 MeV/c 2 or 2 %) Cathode Strip Chamber characteristics: –Anode wire and cathode strip spacing = 1cm –Detector gap width = 0.6 cm –Three gaps at stations 1 and 2, two gaps at station 3 –Single plane resolution  100  m  chamber  60  m –Over 20,000 channels to readout in the south arm

6. Rusty Towell for the PHENIX collaboration Oct 18, 2001APS/JPS Meeting Maui, Hawaii6 Chamber Construction Stations 1 and 3 used etched copper skins for cathode planes. Station 2 used etched copper covered mylar windows for cathode planes to minimize multiple scattering. Station 2 chambers were designed to have a total thickness  0.5% radiation lengths.

7. Rusty Towell for the PHENIX collaboration Oct 18, 2001APS/JPS Meeting Maui, Hawaii7 FEE Overview Inside Magnet/no access Limited Space Power constrain Many Channels –168 FEMs –over 20,000 channels

8. Rusty Towell for the PHENIX collaboration Oct 18, 2001APS/JPS Meeting Maui, Hawaii8 South Muon Magnet Station 1 Chambers and FEE Installed

9. Rusty Towell for the PHENIX collaboration Oct 18, 2001APS/JPS Meeting Maui, Hawaii9 South Muon Magnet Side view of chambers and FEE

10. Rusty Towell for the PHENIX collaboration Oct 18, 2001APS/JPS Meeting Maui, Hawaii10 PHENIX Detector - Now

11. Rusty Towell for the PHENIX collaboration Oct 18, 2001APS/JPS Meeting Maui, Hawaii11 Deconfinement by J/  suppression Thermal Production of Charm Chiral Symmetry Restoration shifting  mass Baseline with  Melting of the  Lots of Physics p-p Spin Measurements

12. Rusty Towell for the PHENIX collaboration Oct 18, 2001APS/JPS Meeting Maui, Hawaii12 J/  Kinematic Coverage 8,000 Simulated J/  ’s accepted into the south muon arm xFxF p T (GeV/c 2 )

13. Rusty Towell for the PHENIX collaboration Oct 18, 2001APS/JPS Meeting Maui, Hawaii13 Expected J/  Yields Run 1 (2000) 0 Run 2 (2001,2)  3 x 10 4 Run 3   10 6 J/  (  +  - ) Muon arms were not installed. Assumes 242  b -1 during Au-Au running. Additional data from p-p spin run and follow-up (?) runs. Commissioning of south muon arm and triggers. Assumes a longer run, higher luminosity and commissioning of the north muon arm.

14. Rusty Towell for the PHENIX collaboration Oct 18, 2001APS/JPS Meeting Maui, Hawaii14 MuTr Event Display

15. Rusty Towell for the PHENIX collaboration Oct 18, 2001APS/JPS Meeting Maui, Hawaii15 Hit Distribution

16. Rusty Towell for the PHENIX collaboration Oct 18, 2001APS/JPS Meeting Maui, Hawaii16 Residuals

17. Rusty Towell for the PHENIX collaboration Oct 18, 2001APS/JPS Meeting Maui, Hawaii17 Correlation with PHENIX

18. Rusty Towell for the PHENIX collaboration Oct 18, 2001APS/JPS Meeting Maui, Hawaii18 Summary The south arm of the muon tracking system has been installed and is being commissioned. The north arm will be installed next year. The data taken by the south arm of PHENIX being taken during this RHIC run, will be the first look at muon physics from RHIC. The initial indications from these data imply that the system is preforming well. We are excited about obtaining physics results in the near future.