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Status of the NIKHEF B Physics Program

J. F.J. van den Brand jo@nikhef.nl December 18, 2002. Status of the NIKHEF B Physics Program. Prepared For: NIKHEF Annual Scientific Meeting. Reduction of material (0.6 X 0  0.4 X 0 in front RICH-2): Better beam pipe and RF foil, light RICH mirror

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Status of the NIKHEF B Physics Program

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  1. J. F.J. van den Brand jo@nikhef.nl December 18, 2002 Status of the NIKHEF B Physics Program Prepared For:NIKHEF Annual Scientific Meeting

  2. Reduction of material (0.6 X0 0.4 X0 in front RICH-2): Better beam pipe and RF foil, light RICH mirror Reduce number of tracking stations (baseline: 9  4)  Tracking performance studies are promising KS reconstruction under investigation Use 1st station in Level-1 trigger Momentum information available in topology trigger May require a full silicon station (6.8 m2)  careful study still needed LHCb Light Marcel Merk, Gerhard Raven Jeroen van Tilburg, Jeroen van Hunen Rutger Hierck, Rutger van der Eijk Major change to tracking system (xx-uu-vv-xx layers/station) Reduced number of stations from 11 (TP) to 9 (OT TDR) to 4 (LHCb light)

  3. LHCb Light LHCb-light TDR submission  September 2003 Need to complete physics performance study with -improved reconstruction and analysis software -much higher bb statistics for the background study This delay does not compromise the overall LHCb plan. Design not affected VELO, T1 to T3 (OT and IT), RICH-2, CALO and Muon proceed towards the construction Re-design needed RICH-1: modify mechanics and optics to shield photon detectors TT: change to all silicon detector to be used in the L-1 trigger. With `LHCb-light’ detector Track reconstruction efficiency is good PID efficiency Track quality Trigger efficiency is good.  A TP level physics performance can be achieved after physics cuts are optimized.

  4. LHCb-light Detector Set-up ~65 m2 ~1.41.2 m2

  5. VELO – Vertex Locator Hans de Vries, Jo van den Brand Marco Kraan, Martin Doets Concentrated on prototyping • RF foil, bellows • Sensors, FE electronics 21 stations VX (84 silicon detectors) 2 stations Pile-Up detector R and Phi readout geometry 220 μm thick

  6. RF foil: hot-gas forming Chiel Bron, Herman Boer Rookhuizen Frans Mul, Johan Kos Full size prototypes produced: 200 and 300 mm thickness

  7. RF Foil, Si-sensors and Tolerances Curvature of RF foil in critical Region is limited to > 1/8 mm Variation in depth • one slot ± 0.1 mm • all slots ± 0.2 mm

  8. 42 mm 8 mm VELO Sensors Sander Mos, Jan Koopstra Joop Rovekamp Silicon sensors: New layout with an overall 45 degree strip design for the R-sensors yields better L1 trigger performance, only small loss in resolution 4-layer hybrid: routing for readout of 2048 strips Strips on R detector: • 16 x 128 • pitch: 40 – 92 mm • length: 6.4 – 66.6 mm • angular coverage 182° Milestones • RF foil review (Nov. 29) • EDR with LHC groups (Dec. 16 & 17) • Decision on FE chip (Jan. 2003) • Silicon design review (Feb. 2003)

  9. VELO: FE electronics shootout Eddy Jans, Henk Jan Bulten Tjeerd Ketel, Sander Klous Hella Snoek, Martin van Beuzekom VELO electronics review in June ’02 revealed no major problems, Level 1 proto-3 digitizer board in design stage Both FE chip candidates, Beetle 1.1 and SCTA_VELO, have been tested with full size hybrids and sensors in beam, final decision in January ‘03 Beetle1.1 is produced by ASIC Heidelberg in collaboration with NIKHEF SCTA_VELO radiation tests done, analysis in progress Beetle 1.2 chip received, tests started, looks okay

  10. 1 million bb events every 10 seconds Free-up bandwidth by vetoing pile-up events 2 LHCb – Luminosity versus Events Leo Wiggers, Marko Zupan Hans Verkooijen, Wilco Vink Problem VETO detectors 2 Si R sensors

  11. Pile-Up Detector: Processor Board Prototype 2 Xilinx FPGAs XCV3200E - 0.18 mm 6-Layer Metal Process - 4,074,387 System Gates - 804 I/O pins 1156 pin BGA - 1156 pin BGA

  12. Outer Tracker Gras van Apeldoorn, Antonio Pellegrino Loek Ceelie, Oscar van Petten, Ruud Arink Henk Schuilenburg, Adrie Liem Layout: - 3 stations - with each 4 layers: X,U,V,X - straw tube modules TDR approved in Feb 2002 New straw material (prelaminated 12 m Al / 25 m Kapton XC)  acceptable gas tightness

  13. Outer Tracker Tidying-up details of the chamber design Improved wire locator design: easier wire insertion and significantly less spurious pulses Mechanical design of FE electronics board vigorously pursued: Front-end electronics, HV and gas supply in limited space Ad Berkien, Tom Sluijk Ed van den Born

  14. Outer Tracker Production Test production of 5 m long panels in Cracow successful • EDR is planned for May ’03 • Materials acquisition in 2003 • Pre-series production in June ’03 • Series production to start in Sep. ‘03 NIKHEF Warsaw Clean rooms at three production sites: -NIKHEF -Heidelberg (existing extended) -Warsaw

  15. OTIS 1.0 TDC chip: first prototype with basic functionality under test Outer Tracker Electronics Albert Zwart Marcel Merk Bart Hommels On detector Off detector Track trigger under investigation NIKHEF responsible for Front-End electronics

  16. Distributed Computing – Grid Henk Jan Bulten, Sander Klous Jeff Templon, David Groep LHCb Data Challenge: Collaborate Grid Middleware with the LHCb software framework Gaudi LHCb Data Challenge Large data samples (3.3 M events) produced in August by Amsterdam (80k), Bologna (1009k), Cambridge (37k), CERN (1452k) Lyon (595k), Moscow (27k), Oxford (24k), RAL (130k), Rio (24k) Data for LHCb-Light and trigger studies Future: employ SARA Mass Storage for DataGrid First use of Storage for DataGrid outside CERN Implement in Analysis: First use of DataGrid for Analysis within LHCb

  17. HERA-B Significant progress: all elements running FLT and SLT working DAQ event rate on tape: 1 kHz (min. bias) 200 Hz (triggered) • running with high priority at Hera since Nov. 1st Thomas Bauer, Maaijke Mevius, Antonello Sbrizzi, Hernan Wahlberg Mohamed Ouchrif Observed signals: Charmonium: J/ (J/e+e-: cut on E/p only), ’, c(c1, c2 states resolved?) Open charm: D+, D-, D0, Ds, D*+ Hyperon: , , -, +, 0, -, + _ Future plans: Strong program in charmonium and open charm physics Bs physics

  18. HERA-B Hera-B DAQ running Trigger: 1FLT 2SLT tracks Muon + Electron channel Approx. 1000 J/ per hour Est. statistics (3 Dec.): 105 J/ 10 % of statistics di-lepton mass:  cumulative data 55M - FLT events - Min. bias events 31M

  19. HERA-B Min. bias data: 15 M events K mass:   mass: 0(1530) 1.67 GeV K+K-+ mass: Ds 1.53 GeV 1.97 GeV Talk by Mohamed Ouchrif

  20. BaBar Gerhard Raven, Henk Jan Bulten Max Baak • Dedicated B physics experiment • Physics programs based on exclusive reconstructed B events • Triggers for purely hadronic B decays • (trivial in the case of BaBar ;-) • Momentum resolution • Vertex resolution • Excellent particle ID: • K/ separation crucial for many topics in B physics • Dedicated Cherenkov detectors for K/ separation

  21. r- u d u d D*+ B0 b d b d c d c d |VubVcd*/Vcb*Vud|~2% D*+ r- B0 c d c d r+ b d b d u d u d D*- B0 D*- r+ B0 BaBar • NIKHEF participates in a cutting edge, dedicated, well-running B physics experiment • Predictable performance, low risk • Timescale good match to current LHC startup • With a limited but coherent effort, we can make an impact on the r-h plane • Measurement(s) of g at BaBar are a good match to our established LHCb plans (expect ~15k reconstructed D*r by summer 2005) • We can gain a lot of B-physics experience which will help improve our readiness to analyze LHCb data at the startup of LHC • Exclusive B reconstruction/selection, time dependent & angular fits, analysis logistics, … sin(2b+g)

  22. LHCb progresses well Inner Tracker TDR, LHCb Light studies Vertex Detector - LHCb TDR approved Dec 2001, Lemic, RF foil VELO group selects Beetle FE chip Level-0 Trigger FOM funding 420 kEuro received Outer Tracker - LHCb TDR approved Feb 2002 OTR Project Leader LHCb – Antonio OTR Clean Room Facility LHCb Distributed Computing NIKHEF – VU Farms in production HERA-B FLT working, data taking in progress First physics publications BaBar Proposal to WAR and SAC Admitted to BaBar last week! Summary – Important Events • New Senior Staff • Antonio Pellegrino (NIKHEF) • Henk Jan Bulten (VU) • Gerhard Raven (VU) • New Postdoc • Jeroen van Hunen • New Ph.D. Students • Max Baak (AIO – BaBar) • Marco Zupan (OIO – LHCb) • Peter Vankov (OIO – LHCb) • Bo Liu (offer: OIO – LHCb) • Ph.D. Theses Completed • Maarten Bruinsma • Wouter Hulsbergen • Rutger van der Eijk • Departed Staff • Bert Koene • Matthew Needham (postdoc) • Iouri Gouz (visitor)

  23. LHCb trigger system Muon System Calorimeter System Pile-up detector 40 MHz high PT muons pile-up veto high PT electrons high PT hadrons high PTg / p0 4 Tb/s Level-0 (4 ms) Level-0 decision unit VELO 1 MHz 100 Gb/s Level-1 Vertex trigger (2ms) Level-1 trigger unit 40 kHz 4 Mb/s Levels-2&3 All the detector Higher Levels

  24. The possible effects of New Physics In this example, a clean measurement of g could provide evidence for new physics

  25. VELO Rectangular Bellows Herman Boer Rookhuizen Jan Langedijk, Michiel Jaspers Parallel effort in edge-welding Rectangular bellows: 3rd iteration in preparation (to solve sagging problem)

  26. VELO Wake Field Suppressors Frans Kroes Niels van Bakel Wake field suppressor (Cu/Be): mechanical testing (30,000 cycles) successful Foil thickness 30 mm Aluminum 50 ohm coaxial line Power level: 10 W at 40MHz

  27. Sensors: RF pick-up Frans Kroes Tjeerd Ketel Si detector 5 mm from the foil outside conductor of the coax. No influence on the noise background. Field levels from this radiator are much higher then what we can obtain with the beam through the RF foil. No influence on sensor and electronics operation.

  28. Luminosity detector Counting the number of one-vertex and two-vertex events Precision of relative luminosity measurement of the order of 0.1% Pile-Up Detector: Algorithm Vertex reconstruction from hits in two detector planes

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