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Heavy flavor physics and m Vertex detector

This project aims to improve heavy flavor physics research by developing a cutting-edge vertex detector to measure heavy flavor hadrons in ultra-relativistic heavy-ion collisions. The detector will enhance precision, separate charm/beauty decay products, and reduce background interference. Key goals include measuring heavy quark energy loss, D0 spectra, D0 v2, charm thermalization, and yields of various hadrons. The state-of-the-art mVertex detector will offer superior resolution and performance, featuring active pixel sensors and innovative readout technologies. Collaboration with leading institutions ensures a comprehensive approach to addressing the challenges in heavy flavor physics research. Stakeholders anticipate significant advancements in the field with the deployment of this sophisticated detector system.

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Heavy flavor physics and m Vertex detector

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  1. Heavy flavor physics and mVertex detector

  2. RNC Group Howard Wieman Hans-Georg Ritter Fred Bieser (Lead Electronic Engineer) Howard Matis Leo Greiner Fabrice Retiere Eugene Yamamoto Kai Schweda Markus Oldenburg Robin Gareus (Univ. of Heidelberg) LEPSI/IReS (Strasbourg) Claude Colledani, Michel Pellicioli, Christian Olivetto, Christine Hu, Grzegorz Deptuch Jerome Baudot, Fouad Rami, Wojciech Dulinski, Marc Winter UCIrvine Stuart Kleinfelder + students LBNL Mechanical Engineering Eric Anderssen (consultation – ATLAS Pixels) Design works BNL Instrumentation Div (consulting) Ohio State U Ivan Kotov People involved

  3. Heavy flavor in ultra-relativistic heavy-ion collisions Heavy Q pair formation How many? c/b quarks in matter Thermalization? Coalescence? Flow? Heavy quark energy loss Low Intermediate pT High pT Heavy flavor hadrons to detectors

  4. Large uncertainties In data In theory Way to improve Measure and identify all charm hadrons Measure precise spectra Measuring yields STAR preliminary

  5. Heavy quarks radiate less energy than light quarks (prediction) Yield of charm and beauty (leading) hadrons less suppressed May be measured by D → X+e- and B → X+e- Without vertex information systematic error from background substraction p + p p + p p + p d + Au d + Au d + Au Heavy-quark energy loss STAR preliminary

  6. Flow: spectra and v2 Charm thermalization by chemistry Flow and thermalization J. Nagle, S. Kelly, M. Gyulassy, S.B. JN, Phys. Lett. B 557, pp 26-32

  7. Goals Heavy flavor energy loss Remove background Charm flow Precise D0 spectra D0 v2 Charm thermalization Yield of D+, Ds+, Lc+ (challenging 3 body decays) mVertex strategy Separate charm and beauty decay product from primary tracks Typically D0 ct = 124 mm mVertex requirement: a very good vertex resolution Position resolution < 10 mm Thickness < 0.2% of rad length to limit multiple scattering Measuring heavy flavor with the mVertex detector

  8. STAR mVertex Detector • Two layers • 1.5 cm radius • 4 cm radius • 24 ladders • 2 cm by 20 cm each • < 0.2% X0 • ~ 100 Mega Pixels

  9. Charm hadron reconstruction performances

  10. STAR mVertex Detector New vertex detector centered in existing SVT, supported one end only End view showing 3 of 6 ladder modules

  11. aluminum kapton cable (100 m) silicon chips (50 m) 21.6 mm 254 mm carbon composite (75 m) Young’s modulus 3-4 times steel Support: thin stiff ladder concept • Under development • Will be tested for vibration in our wind tunnel

  12. Sensors: Active Pixel Sensors • Advantages • Precise • Can be thin • Rather fast • Low power • Disadvantages • Small signal • Not that fast • New • Need R&D CMOS electronic Analog & digital p-well n-well p-well 5-20 mm p-epi p-substrate

  13. 1st Generation: 5-10 ms readout time MIMOSTAR1 designed by LEPSI/IRES (Strasbourg) 640*640 pixel of 30*30 mm2 pitch Purely analog Parallel readout on-chip multiplexed to 2 kind of outputs 1 * 100MHz driver 10 * 10 MHz drivers 2nd Generation: Faster but need more R&D R&D with UCIrvine and LEPSI/IRES Improve charge collection and remove need for CDS Photogate, Active reset, … Some digital processing Up to cluster-finder? Sensors: 2 generations

  14. Readout • Analog to end of the ladder (~1 m away) • Challenge to drive analog signal at 100 MHz over 1m • Piggy back chip • ADC and memory on a chip bounded to the pixel chip • On-chip processing in 2nd generation • Data reduction at the end of the ladder • Hardware reduction (zero suppression) • Single board computer

  15. Budget • FY02-FY04 LBNL LDRD (total 375K$) • FY04 RHIC R&D (200 K$ through Brookhaven) • Expected to continue until project is funded • Preparing a strategic LDRD fund request geared towards the development of future tracking apparatus with the Physics Division (Linear Collider)

  16. The time-scale • Proposal in April 2004 • 1st ladder prototype this fall (2004) • Investigate mechanical support, cabling and some readout issues • Sensor: MIMOSA5 large but slow and “noisy” • 2nd ladder prototype next year (fall 2005) • Sensor: MIMOSTAR1 (submitted in July) • R.Gareus’s Readout chip (submitted in July) • The real thing starting in 2006 • Pending funding and success of prototypes

  17. Summary A lot of work ahead of us!

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