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The STAR Heavy Flavor Tracker in 10 slides or less Jim Thomas Lawrence Berkeley Laboratory

The STAR Heavy Flavor Tracker in 10 slides or less Jim Thomas Lawrence Berkeley Laboratory 19 - January - 2007. “Heavy Flavor” is the Final Frontier. The QGP is the universally accepted hypothesis at RHIC

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The STAR Heavy Flavor Tracker in 10 slides or less Jim Thomas Lawrence Berkeley Laboratory

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  1. The STAR Heavy Flavor Tracker in 10 slides or less Jim Thomas Lawrence Berkeley Laboratory 19 - January - 2007

  2. “Heavy Flavor” is the Final Frontier • The QGP is the universally accepted hypothesis at RHIC • The next step in confirming this hypothesis is the proof of thermalization of the light quarks in RHIC collisions • The key element in proving this assertion is to observe the flow of charm … because charm and beauty are unique in their mass structure • If heavy quarks flow • frequent interactions among all quarks • light quarks (u,d,s) likely to be thermalized Current quark: a bare quark whose mass is due to electroweak symmetry breaking Constituent quark: a bare quark that has been dressed by fluctuations in the QCD sea

  3. How many c c-bar pairs per collision?

  4. Direct Topological Identification of Open Charm Goal: Put a high precision detector near the IP to extend the TPC tracks to small radius The STAR Inner Tracking Upgrades will identify the daughters in the decay and do a direct topological reconstruction of the open charm hadrons. No Mixed events, no random background subtraction.

  5. The HFT: 2 layers of Si at mid rapidity The Heavy Flavor Tracker • A new detector • 30 mm silicon pixels to yield 10 mm space point resolution • Direct Topological reconstruction of Charm • Detect charm decays with small ct, including D0 K  • New physics • Charm collectivity and flow to test thermalization at RHIC • Charm Energy Loss to test pQCD in a hot and dense medium at RHIC • R&D with HFT + SSD • A proposal has been submitted and a TDR is in preparation

  6. R&D is Driven by the Fabrication Schedule Driven by the availability of CMOS Active Pixel Sensors Build a full detector with each

  7. Surround the Vertex with Si The HFT is a thin detector using 50 m Si to finesse the limitations imposed by MCS Add the IST, and SSD to form the STAR Inner Tracking Upgrade ( ITUp )

  8. Inside the IFC ~ 1 m • Goal: graded resolution from the outside – in • TPC – SSD – IST – HFT • TPC pointing resolution at the SSD is ~ 1 mm • SSD pointing at the IST is ~ 300 mm • IST pointing at the HFT is ~ 150 mm • HFT pointing at the VTX is better than 50 mm

  9. The Heavy Flavor Tracker

  10. Keep the SSD, it is a beautiful detector! • The SSD is thin • 1% - double sided Si • The SSD lies at an ideal radius • 23 cm - midway between IP and IFC • The SSD has excellent resolution • (rumor says better than design) • The SSD is too large to be replaced • The money is better spent, elsewhere

  11. Summary • The STAR Inner Tracking Upgrade will explore the Charm sector • We will do direct-topological-reconstruction of open Charm • Our measurements will be unique at RHIC • The key measurements include • V2 • Energy Loss • Charm Spectra, RAA & Rcp • Vector mesons • Angular Correlations • The technology is available on an appropriate schedule

  12. Install and run MimoSTAR IV Detector (Full) Install MimoSTAR III Ladder Install MimoSTAR IV Prototype Detector Install UltraSTAR Detector (Full) X X X X X 06 07 08 09 10 Install and test Prototype detector. Reduced diameter BP is required. HFT R&D and Installation Timeline Install MimoSTAR II Telescope Proposed HFT Timeline – the IST comes about 1 year later X marks the installation dates. Running comes after installation.

  13. R&D in Run 7 A Three Layer Telescope with MimoSTAR II Chips. A full system test from pixel to DAQ using an extension of one TPC sector trigger line.

  14. SSD ~ 60 cm • Double sided Si wafers 300 mm thick with 95 mm x 4.2 cm strips • Crossed at 35 mrad – effectively 30 mm x 900 mm • One layer at 23 cm radius • 20 ladders, 67 cm long • air cooled •  < 1.2 • 1 % radiation length @  = 0

  15. IST ~ 36 cm • Singled sided Si wafers 300 mm thick with 60 mm x 4.0 cm strips • Si pads ~ 1 mm**2 on the other side of each ladder • Two layers at 17 & 12 cm radius • 27 ladders, 52 cm long • 19 ladders, 40 cm long • air cooled •  < 1.2 • 1.5 % per layer @  = 0

  16. HFT ~ 17 cm • Active Pixel Sensors, thinned to 50 mm thickness • 30 mm x 30 mm pixels • Two layers at 7 & 2.5 cm radius • 24 ladders, 19.2 cm long • 9 ladders, 19.2 cm long • air cooled •  < 1.2 • 0.28 % radiation length @  = 0

  17. Selected Parameters and Specifications

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