Status of the NIKHEF B Physics Program J. F.J. van den Brand [email protected] December 18, 2002 Prepared For: NIKHEF Annual Scientific Meeting
Jan 02, 2016
Status of the NIKHEF B Physics Program
J. F.J. van den [email protected] 18, 2002
Prepared For:NIKHEF Annual Scientific Meeting
Prof.dr Ing. J.F.J van den Brand, Dec. 2002 – 2
1. 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
2. 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
Major change to tracking system
LHCb Light
Reduced number of stations from 11 (TP) to 9 (OT TDR) to 4 (LHCb light)
(xx-uu-vv-xx layers/station)
Marcel Merk, Gerhard RavenJeroen van Tilburg, Jeroen van HunenRutger Hierck, Rutger van der Eijk
Prof.dr Ing. J.F.J van den Brand, Dec. 2002 – 3
LHCb-light TDR submission September 2003Need 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.
LHCb Light
Design not affectedVELO, T1 to T3 (OT and IT), RICH-2, CALO and Muon
proceed towards the constructionRe-design neededRICH-1: modify mechanics and optics to shield photon detectorsTT: change to all silicon detector to be used in the L-1 trigger.
With `LHCb-light’ detectorTrack reconstruction efficiency is goodPID efficiencyTrack qualityTrigger efficiency is good.
A TP level physics performance can be achieved
after physics cuts are optimized.
Prof.dr Ing. J.F.J van den Brand, Dec. 2002 – 5
VELO – Vertex Locator
• 21 stations VX (84 silicon detectors)• 2 stations Pile-Up detector • R and Phi readout geometry• 220 μm thick
Concentrated on prototyping• RF foil, bellows• Sensors, FE electronics
Hans de Vries, Jo van den BrandMarco Kraan, Martin Doets
Prof.dr Ing. J.F.J van den Brand, Dec. 2002 – 6
Full size prototypes produced: 200 and 300 m thickness
RF foil: hot-gas formingChiel Bron, Herman Boer RookhuizenFrans Mul, Johan Kos
Prof.dr Ing. J.F.J van den Brand, Dec. 2002 – 7
RF Foil, Si-sensors and Tolerances
Curvature of RF foil in criticalRegion is limited to > 1/8 mm
-84.2
-84
-83.8
-83.6
-83.4
-83.2
-83
-82.8
-82.6
-82.4
-82.2
-82
-702 -701 -700 -699 -698 -697 -696 -695 -694 -693
Variation in depth• one slot ± 0.1 mm• all slots ± 0.2 mm
Prof.dr Ing. J.F.J van den Brand, Dec. 2002 – 8
8 mm
42 mmMilestones• RF foil review (Nov. 29)• EDR with LHC groups (Dec. 16 & 17)• Decision on FE chip (Jan. 2003)• Silicon design review (Feb. 2003)
VELO Sensors
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
Strips on R detector:• 16 x 128 • pitch: 40 – 92 m• length: 6.4 – 66.6 mm• angular coverage 182°
4-layer hybrid: routing for readout of 2048 strips
Sander Mos, Jan KoopstraJoop Rovekamp
Prof.dr Ing. J.F.J van den Brand, Dec. 2002 – 9
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
SCTA_VELO radiation tests done,analysis in progress
VELO electronics review in June ’02 revealed no major problems,Level 1 proto-3 digitizer board in design stage
Beetle1.1 is produced by ASIC Heidelberg in collaboration with NIKHEF
VELO: FE electronics shootout
Beetle 1.2 chip received, tests started, looks okay
Eddy Jans, Henk Jan BultenTjeerd Ketel, Sander KlousHella Snoek, Martin van Beuzekom
Prof.dr Ing. J.F.J van den Brand, Dec. 2002 – 10
LHCb – Luminosity versus Events
Problem
VETO detectors
2
1 million bb eventsevery 10 seconds
Free-up bandwidth byvetoing pile-up events
2 Si R sensors
Leo Wiggers, Marko ZupanHans Verkooijen, Wilco Vink
Prof.dr Ing. J.F.J van den Brand, Dec. 2002 – 11
Pile-Up Detector: Processor Board Prototype
2 Xilinx FPGAs XCV3200E - 0.18 m 6-Layer Metal Process - 4,074,387 System Gates - 804 I/O pins 1156 pin BGA - 1156 pin BGA
Prof.dr Ing. J.F.J van den Brand, Dec. 2002 – 12
Layout: - 3 stations - with each 4 layers: X,U,V,X - straw tube modules
TDR approved in Feb 2002
Outer Tracker
New straw material (prelaminated 12 m Al / 25 m Kapton XC) acceptable gas tightness
Gras van Apeldoorn, Antonio PellegrinoLoek Ceelie, Oscar van Petten, Ruud ArinkHenk Schuilenburg, Adrie Liem
Prof.dr Ing. J.F.J van den Brand, Dec. 2002 – 13
Tidying-up details of the chamber design
Improved wire locator design: easier wire insertion and significantly less spurious pulses
Outer Tracker
Mechanical design of FE electronics board vigorously pursued: Front-end electronics, HV and gas supply in limited space
Ad Berkien, Tom SluijkEd van den Born
Prof.dr Ing. J.F.J van den Brand, Dec. 2002 – 14
Outer Tracker Production
NIKHEF
Warsaw
Clean rooms at three production sites: -NIKHEF -Heidelberg (existing extended) -Warsaw
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
Prof.dr Ing. J.F.J van den Brand, Dec. 2002 – 15
On
dete
ctor
Off
det
ecto
r
OTIS 1.0 TDC chip: first prototype with basic functionality under test
Outer Tracker Electronics
Track triggerunder investigation
Albert Zwart Marcel MerkBart Hommels
NIKHEF responsible for Front-End electronics
Prof.dr Ing. J.F.J van den Brand, Dec. 2002 – 16
LHCb Data Challenge: Collaborate Grid Middleware with the LHCb software framework Gaudi
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)
Distributed Computing – Grid
Future: employ SARA Mass Storage for DataGrid
LHCb Data Challenge
Henk Jan Bulten, Sander KlousJeff Templon, David Groep
• First use of Storage for DataGrid outside CERN
• Implement in Analysis: First use of DataGrid for Analysis within LHCb
Data for LHCb-Light and trigger studies
Prof.dr Ing. J.F.J van den Brand, Dec. 2002 – 17
Significant progress:all elements runningFLT and SLT workingDAQ event rate on tape:
1 kHz (min. bias)200 Hz (triggered)
running with high priority at Hera since Nov. 1st
Observed signals:
Future plans: Strong program in charmonium and
open charm physicsBs physics
Charmonium: J/ (J/e+e-: cut on E/p only),
’, c (c1, c2 states resolved?)
Open charm: D+, D-, D0, Ds, D*+
Hyperon: , , -, +, 0, -, +
_
HERA-BThomas Bauer, Maaijke Mevius,Antonello Sbrizzi, Hernan WahlbergMohamed Ouchrif
Prof.dr Ing. J.F.J van den Brand, Dec. 2002 – 18
Trigger: 1FLT 2SLT tracksMuon + Electron channelApprox. 1000 J/ per hourEst. statistics (3 Dec.): 105 J/
10 % of statisticsdi-lepton mass: cumulative data
55M
31M
- FLT events- Min. bias events
Hera-B DAQ running
HERA-B
Prof.dr Ing. J.F.J van den Brand, Dec. 2002 – 19
Min. bias data:15 M events
mass: 0(1530) K mass:
K+K-+ mass: Ds
1.53 GeV
1.97 GeV
1.67 GeV
HERA-B
Talk by Mohamed Ouchrif
Prof.dr Ing. J.F.J van den Brand, Dec. 2002 – 20
BaBarGerhard Raven, Henk Jan BultenMax 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
Prof.dr Ing. J.F.J van den Brand, Dec. 2002 – 21
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 - plane – Measurement(s) of at BaBar are a good match to our
established LHCb plans (expect ~15k reconstructed D* 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, …
B0 bd
ud
cd
-
D*+
bd
cd
ud -
D*+B0
bd
cd
ud
bd
ud
cd
+
+
D*-
D*-
B0
B0
|Vub
ubV
cd* /V
cb* V
ud|~
2% sin(2+)
Prof.dr Ing. J.F.J van den Brand, Dec. 2002 – 22
Summary – Important Events 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!
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)
Prof.dr Ing. J.F.J van den Brand, Dec. 2002 – 23
LHCb trigger system
40 MHz
40 kHz 4 Mb/s
4 Tb/s high PT muons high PT electrons high PT hadronshigh PT / 0
pile-up veto
Level-0 decision unit
Muon System Calorimeter System Pile-up detector
Higher Levels
Level-0 (4 s)
Level-1Vertex trigger
(2ms)
Levels-2&3All the detector
Level-1 trigger unit
1 MHz100 Gb/s
VELO
Prof.dr Ing. J.F.J van den Brand, Dec. 2002 – 24
The possible effects of New Physics
In this example, a clean measurement of could provide evidence for new physics
Prof.dr Ing. J.F.J van den Brand, Dec. 2002 – 25
VELO Rectangular Bellows
Rectangular bellows: 3rd iteration in preparation (to solve sagging problem)
Parallel effort in edge-welding
Herman Boer RookhuizenJan Langedijk, Michiel Jaspers
Prof.dr Ing. J.F.J van den Brand, Dec. 2002 – 26
Wake field suppressor (Cu/Be):mechanical testing (30,000 cycles) successful
VELO Wake Field Suppressors
Foil thickness 30 m Aluminum50 ohm coaxial linePower level: 10 W at 40MHz
Frans KroesNiels van Bakel
Prof.dr Ing. J.F.J van den Brand, Dec. 2002 – 27
Sensors: RF pick-up
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 higherthen what we can obtain with the beam through the RF foil.No influence on sensor and electronics operation.
Frans KroesTjeerd Ketel