Status of the NIKHEF B Physics Program

J. F.J. van den Brandjo@nikhef.nlDecember 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 – 4

~1.41.2 m2

~65 m2

LHCb-light Detector Set-up

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

Prof.dr Ing. J.F.J van den Brand, Dec. 2002 – 28

Vertex reconstruction from hits in two detector planes

PV AA

B PV B

Z Zrk

r Z Z

Pile-Up Detector: Algorithm

Luminosity detector

Counting the number of one-vertex and two-vertex events

Precision of relative luminosity measurement of the order of 0.1%