The STAR Heavy Flavor Tracker Jim Thomas Lawrence Berkeley Laboratory 11 / 07 / 2006. “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
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Lawrence Berkeley Laboratory
11 / 07 / 2006
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
Signals early equilibration (teq 0.6 fm/c)Flow: Probing Thermalization of the Medium
In the recombination regime, meson and baryon v2 can be obtained from the quark v2 :
Does it work in the Charm Sector? A strong test of the theory
Levai, Mueller, and Wang, PRC 51, 3326 (1995).
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.
The Heavy Flavor Tracker
to yield 10 mm space point resolution
Driven by the availability of CMOS Active Pixel Sensors
Build a full detector with each
The HFT is a thin detector using 50 m Si
to finesse the limitations imposed by MCS
Add the HPD, IST, and SSD to form the STAR Inner Tracking Upgrade ( ITUp )
~ 1 m
Andrew Rose, Sevil Salur, et al.
Yan Lu & JT