on behalf of the LHCb collaboration Tatsuya Nakada CERN and EPFL*) CERN-RRB-2003-148 Status of the LHCb Experiment LHCb Resource Review Board 22nd October 2003 on behalf of the LHCb collaboration Tatsuya Nakada CERN and EPFL*) *) Institute of High Energy Physics (IPHE), University of Lausanne was transferred to Laboratory of High Energy Physics (LPHE), EPFL

Contents Detector status Revised cost and funding of the experiment Conclusions

1) Detector status All the detector subsystem TDR’s are now completed Approved TDR’s Last two detector TDR’s just submitted (Computing TDR to be submitted later)

The LHCb detector Changes were made for Reduced number of layers for M1 (4  2) Reduced number of tracking stations behind the magnet (4  3) No tracking chambers in the magnet No B field shielding plate Full Si station Reoptimized RICH-1 design Reduced number of VELO stations (25  21) Changes were made for material reduction and L1 trigger improvement

Beam Pipe Al window Done by the LHC vacuum group EDR 30 Sep 2003

Magnet Yoke Assembly of the lower half Plates are fixed by tie-rods Lower half completed Assembly of the sides in progress

VELO Si sensor test beam set-up Wake-field suppressor and RF foil Prototype Test design constructed Construction of VELO tank support stand

Outer Tracker EDR in June and ready for the production Aligning the template for straw gluing Straw production

RICH2 RICH2 exit window being made

Calorimeter SPD/Preshower production started Ecal modules: 100% constructed Hcal modules: 30% constructed

Muon system Frascati CERN First series production chambers Frascati Clean Room panel on wiring machine soldering table assembly tables Frascati First series production chambers CERN

Online Final prototypes being produced Gbit Ethernet board for the common readout card (TELL1) Timing and Fast Control (trigger and readout supervisor)

Offline A small team, working efficiently and collaborating well with LCG, is producing only “very essential” software:  led to the success of the TDR performance study However with down-scoping, delaying, reprioritizing… LHCC manpower review for the core offline software The committee reviewed their manpower planning and agree with their estimates that the current shortage of core software developers is about six (6) FTEs. As a consequence of this shortfall there are a number of areas that do not receive the attention they deserve. With the additional manpower they would be able to put effort on the development and testing of the conditions database infrastructure, on user support, QA, documentation and the maintenance of the collaboration’s web pages. Collaboration will seek for help from the collaborating institutes, including CERN.

LHCb Milestone Plots

Reoptimization  Modified RICH1 and TT designs RICH1: material reduction incorporate B field TT: to be included in Level-1 trigger

RICH1 -Vertical optics with two mirrors -Spherical mirror from composite or Be -Mirror support out of acceptance -Direct coupling to VELO tank -Iron B field shielding box

Trigger Tracker Test beam: long silicon ladders with large strips. 8.3 m2 of Si 180k readout channels ~30 cm ladder

Examples for event efficiencies e total = e acceptance  e trigger  e reconstruction Decay modes TP [%] Now [%] Comments B0p+p- 0.55 0.69 g with BsK+K- - 0.99 U-spin BsDsK 0.51 0.27 g B0DK*0 0.23 0.35 g BsDsp 0.57 0.34 Bs oscillations B0J/y(mm)KS 1.15 1.39 b BsJ/y(mm)f 2.24 1.67 c B0gK*0 0.18 0.16 bs penguin Similar physics performance to that given in TP, but with much more realistic simulation programme. (event generation, detector response, pattern recognition etc.)

2) Revised cost and funding of the experiment Subsystem Cost [MCHF] D from MoU Comment VELO 4.82 MoU included Pile-Up trigger IT 2.47 TT 3.40 OT 6.23 10  3 stations*) RICH 9.57 New RICH1*)&MaPMT analogue Calo 15.06 Muon detect. 6.93 Muon Fe 4.00 L0 Trig 2.26 DAQ&CPU(L1/HTL) 5.71 ECS&TFC 1.58 Computing infra. 0.71 Experiment infra. 4.00 Magnet 6.00 -0.28 +0.72 Now all Si TT*) -3.86 +1.87 -0.30 -0.52 +0.06 Pile-Up trigger added *) due to reoptimization Increase of RICH1 mechanics from TDR = 492kCHF: due to B field shielding box, Be mirror, superstructure, etc. Total cost = 72.74 MCHF (-2.31 MCHF compared to the MoU cost) Requested funding in MoU = 73.30 MCHF

Revised Funding situation (in MCHF) Funding country MoU Now Comments Brazil 1.7 0 MoU not signed China 0.25 0.1 MoU by Tsinghua University FR(IN2P3) 7.5 7.5 extra engineering effort by Annecy DE(BMBF) 4.8 3.76 MoU to be signed. New MPI request not approved (MPG) 2.2 2.2 some uncertainty IT 10 10.6 extra contribution to Muon NL 6.3 6.3 Poland 0.5 0.5 MoU to be signed Romania 0.3 0.3 Russia 3 2.5 shifted to machine, CERN partially compensates Spain 2 2 Switzerland 7.9 7.9 UK 10.3 10.3 Ukraine 0.2 0.2 CERN 16.35 16.7 inclu. muon Fe and Russian compensation Total 73.3 70.86

Funding balance and strategy Current funding 70.857 MCHF Current detector cost 72.734 MCHF Balance - 1.877 MCHF (2.6%) The cost-funding matrix must be revised in order to accommodate the changes caused by the reoptimization of the detector and presently available funding.

What we present now is a model we consider reasonable Two guidelines for the revision: Move CERN and Common Funds first to balance Move national funding among the already committed subsystems What we present now is a model we consider reasonable The LHCb collaboration would like to ask RRB to support the principle of shifting the funding allocations among different subsystems in agreement with the parties concerned

Cost-Funding Matrix

Country (subsystem) MoU New CERN (ST) 0.00  0.56 CERN (OT) 3.40  0.00 CERN (RICH) 1.00  1.87 adjusting for the overall situation CERN (Muon) 0.20  0.52 CERN (Online) 0.73  2.38 IT (Muon) 4.85  5.45 0.6 extra contribution IT (Trigger) 0.80  0.43 due to cost reduction IT (Online) 0.50  0.87 increased responsibility UK (RICH) 5.70  6.30 UK (Online) 0.60  0.00 DE(ST) 1.69  1.72 DE(OT) 1.92  2.17 DE(Online) 1.02  0.00 DE(CF) 2.00  1.70 CF (Muon) 0.00  0.40 adjusting for no Brazilian funding CF (OT) 0.90  0.63 CF (Online) 3.50  2.43 CF(Calo) 5.31  5.29 CF(reduction) 0.00  0.96 due to reduced funding adjusting for the RICH cost increase adjusting for the BMBF rejection for the MPI funding request A model for redistribution (MCHF)

How to cope with missing fund? ST 211 kCHF due to the funding reduction by BMBF  continue effort to reduce cost and to restore reduced funding RICH 500 kCHF due to the photon detector option  continue effort to reduce cost and to search for extra funding Online 1016 kCHF  CPU’s, 3158 kCHF, will be bought as late as possible (>2005) i.e. we have time to keep trying to get funding from Brazil. If still no funding available, start with a smaller number (2/3) of processors.

3) Conclusions Reoptimization of the LHCb detector successfully finished and all the detector TDR’s completed. Magnet, Calorimeters and RICH2 production advancing. VELO, Muon and Outer Tracker production just started/about to start. Cost of the reoptimized detector ~73 MCHF, ~2 MCHF less than that given in MoU, matching with the MoU funding prospect. Due to funding reduction by some countries, in spite of extra contribution from Italy, still under-funding of ~2 MCHF. However, we have a strategy to cope with it. We would like to ask RRB supporting the principle of making the necessary shifts of funding among subsystems.