CDF: Prospettive e upgrades · 2003-09-23 · Pisa: Settembre 2003 F. Bedeschi, INFN-Pisa 1 CDF:...
Transcript of CDF: Prospettive e upgrades · 2003-09-23 · Pisa: Settembre 2003 F. Bedeschi, INFN-Pisa 1 CDF:...
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CDF: Prospettive e upgrades
v Stato Tevatron e CDFv Risultati recenti e prospettivev Run IIB:Ø Situazione generaleØ Stato progetti a partecipazione italianaØ L’upgrade del CPR (v. presentazione S. Lami)
v L’upgrade di SVT (v. presentazione di P. Giannetti)v Calcolo (v. presentazione S. Belforte)v Sommario richieste finanziarie
SOMMARIOINFN - Riunione della
CSN 1Lecce
24 Settembre 2003Franco BedeschiINFN-Pisa
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2TeV Luminosity(current situation)
vPeak luminosity ØBest 5.2x1031
vDelivered/on tapeØ330/260 pb-1
Delivered
On tape
5x1031
Luminosity
Integrated
Initialinstantaneous
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Tev 2003 Luminosity
v Goals for 2003 Ø Base goals:
200 pb-1 in FY 200310 pb-1/wk end of 2003
5.4x1031 typicalØ Stretch goals:
320 pb-1 in FY 200315 pb-1/wk end of 2003
7.6x1031 typical (~max achievable without Recycler)
Ø Integrated luminosity goal achieved, but …
Half of shutdown in FY04Avg. lum. lower than predicted
v FY04: Double data set
~150 pb-1
As of 5/6/03
~250 pb-1
As of 9/3/03
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CDF operations
v All CDF operating reliablyØ Silicon stable
v Data taking efficiency highØ 80-90% typical
v Some limitations in L1 trigger output rateØ < 20 kHz achieved
~ 50 kHz designForce prescale of B physicsProblem gets worse at higher luminosity (more in Paola’s talk)
Ø Requires work on DAQ/L2vMassive Italian effort on SVTv L00 aligned and improving
resolutionNow
Hadronic Bs trigger
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SVT trigger improvements in 2003 (at 0 cost)
vWhatever could be done with no upgrade has already been done!Ø 4/5 : 1.5x efficiency, more uniform coverage, avoid efficiency change while
single SVX ladder are out of DAQ for a few days - CarosiØ 3/3 : recover another SVX wedge/barrel - CarosiØ AMS firmware optimization : saves 700nsec – BelforteØ Avoid fitting tracks 1.5<Pt<2 : 30% less to fit – BelforteØ Skip events that do not require SVT al L2 (hight Pt jets, MET and leptons):
saves 1 microsec (more as L increases) – Belforte, RescignoØ Road Warrior: removes duplicate fit combination for 4/5, saves 30% of time
Algorithm, timing studies, simulation, proof of feasibility - Annovi, Belforte, Catastini, CerriFirmware – Spinella (this fall)Money (~60k$) - Fermilab
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Results from L00
vClear D resolution improvements with L00ØMost gain at low pt and in areas with much materialØStill room for improvement of alignment
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Physics Results
vData used for summer conferences 2003ØData set collected February 02 – May 03Ø230 pb-1 delivered, 170 pb -1 on tape, <140 pb -1 used for analysis à now 330 pb-1 delivered, 260 pb-1 on tape
Some preliminary results available at higher statistics
vMuch progress since May 03Ø Italian group is giving key contributionsØWill cover only highlights with emphasis on Italian work
Top quarkEWKB physics
Discuss Bs mixing reach as example of trigger issues
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Italian group contributions
v B/charm physicsØ Topics: Bàhh (ACP, BR), Λbàpπ search, BsàDsπ & lνDs (preparatory to
Bs mixing), Bsàφφ, BdàφK*, BàφK (ACP, BR), D0àhh (BR, ACP)Ø Groups involved: Padova, Pisa, Roma, Trieste
v High pt physicsØ Topics: Zàbb, Higgs searches, top physics, hadronic top, top backgrounds,
b-tagging, W+jets, forward W’sØ Groups involved: Bologna, Padova (Trento), Pisa, Roma
v Responsibilities:Ø Conveners of B physics subgroupsØ Convener of top groupØ Members of important review committees (eg. Higgs reach)
vMost work in close cooperation with other non-Italian groupsvMost work in close cooperation among the Italian groups
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Top (di-leptons)
2 high pT leptons (e,µ,τ,iso track)
2 central jetsLarge Missing ET
HT: scalar sum of all the measured“objects” ET’s (leptons,jets)
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Top (l+jets)
1 high pT lepton(e,µ)
≥3 central jets
Large Missing ET
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Top x-section
(syst)(stat)7.6 1.51.9
3.83.1
+−
+−
1.7(syst)3.4(stat)7.3 ±±
0.9(syst)1.9(stat)5.3 ±±
2.1(syst)1.8(stat)5.1 ±±
0.9(lum)(syst)(stat)8.7 2.72.0
6.44.7 ±+
−+−
0.8(lum)(syst)(stat)8.1 1.61.4
2.22.0 ±+
−+−
0.5(lum)(syst)(stat)4.6 2.12.0
3.12.7 ±+
−+−
1.1(lum)(syst)(stat)11.4 2.01.8
4.13.5 ±+
−+−
0.8(lum)(syst)(stat)8.0 1.71.5
2.42.1 ±+
−+−
0.7(lum)(syst)(stat)7.4 2.11.8
4.43.6 ±+
−+−
1.1(lum)(syst)(stat)10.8 2.12.0
4.94.0 ±+
−+−
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Top mass
212.79.4 GeV/c 7.1(syst)(stat)177.5 ±+
−
Mass in lepton+jets channelwith a b-tagged jet Mass in dilepton channel
217.416.9 GeV/c 7.9(syst)(stat)175.0 ±+
−
CDF RunII preliminary, 108 pb-1CDF RunII preliminary, 126 pb-1
6 events
Data 22 evts
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Hadronic top
vWork in progress!ØTop mass distribution
with 165 pb-1 of double tagged multi-jet eventsØBackground from 0 tag
sampleØMain goals:
Top x-section in hadronic channelTop mass measurement in hadronic channel
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Zàbb
vWork in progressØ~70 pb-1ØUpdate soon with
>x2 statisticsØGood
understanding of sample compositionØTrigger updated
vCritical signal for:ØTop mass accuracyØ Improving bb di-jet
mass resolution
2 tags2 tagssubtracted
1 tag 1 tagsubtracted
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Forward W’s
vCurrent blessed result with ~70 pb-1
ØUpdate soonØWorking on cross
section systematicsvGoals:ØMeasure x-section in
forward regionσW = 2.81±0.39 nb
Ø Include forward W’s in top and other high pt analyses
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ψ 3870
v ψππ narrow resonance at ~ 3870 MeV reported by Belle at Lepton-Photon Ø 34.4±6.5 eventsØ May be an L=2 cc state
v CDF has searched for this state in its large sample of ψ (>2M) and found it too!Ø 8.5 σ effectØ Hint seen in run 1 data
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B lifetimes
vComplete set of lifetime measurements with exclusive B statesØBu, Bd show reliabilityØBs already better than WASpecies Bu Bd Bs Λ bCDF τ (ps) 1.63±0.050±0.04 1.51±0.060±0.02 1.33±0.14±0.02 1.25±0.260±0.10HFAG τ (ps) 1.65±0.014 1.53±0.013 1.44±0.17 1.23±0.077
Bu Bs
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Bs à lνDs
v Collecting the high statistics samples of Bàlepton + CharmØ Still working on lifetime
systematicsØ This sample can be used
also for Bs mixing
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Hadronic B’s (2 body)v Yields doubledØ Trigger work!Ø 871 events in peak!Ø Now σeff ~ 6 pb
vMeasurements with 68 pb-1 only:Ø Will update for winter
conferencesSimulation
Bd→KπBs→KKBd→π πBs→K π
µ = 5.252(2) GeV/c2
σ = 41.1(1.9) MeV/c2
M(ππ)
L~180 pb-1
Tight cuts871 eventsLoose cuts1766 events
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Hadronic B’s (two body)
v Current measurements and projections (68 pb-1)Ø fs BR(BsàKK)/fd BR(BdàKπ) = 0.74±0.2±0.22
First measurement! CDF onlyExpect 10% error by next summer
Ø BR(Bdàππ)/BR(BdàKπ) = 0.26±0.11±0.06Belle/BaBar errors: 0.033/0.035 LP2003Could reach above accuracy by fall 2004
Ø ACP(BdàKπ) = 0.02 ± 0.15 ± 0.017Belle error: 0.035 LP2003
Ø ACP(Bdàππ) : need ~2 fb-1 for γ measurement to 10o
10o is still statistics limited
v Expect ~x2 error reduction with current statistics (180 pb-1)Ø Systematic too with better dE/dx
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BR(B±à φK±) at CDF
First time at CDF : B±à φK±
BR( B±à φK± ) ———————— = 0.0068 ± 0.0021(stat.) ± 0.0007(syst.)
BR( B±à J/ψK± )
§ 23 ± 7 events§ 120 pb-1
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Hadronic B’s (many bodies)
v Understanding backgrounds and yields with large MC samples
B+
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Hadronic B’s (many bodies)
v Understand hadronic Bs yield. Measure BR: NEW!Ø BR(BsàDsπ) = (4.8±1.2(stat)±1.8(BR)±0.8(sys)±0.6 (fs/fd))x10-3
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Bs mixing expectations
v Expectations extrapolating from current dataØ Still large uncertainties on:
Final event yield (depends on upgrades)Max lifetime resolution achievableMax εD2 (tagging power) achievable
Ø Make very conservative assumptions!
v Sensitivity = ∆ms/σØ 2σ sensitivity for = 15 ps-1 with ~0.5 fb-1
Surpass current world limitØ 5σ sensitivity for = 18 ps-1 with 1.7 fb-1
Ø 5σ sensitivity for = 24 ps-1 with 3.2 fb-1
v Current constraints:Ø Lower limit LEP+SLD: ∆ms >15 ps-1 WAØ Constraints from global fits: ∆ms = 21 ± 4 ps-1 (Durham 2003)
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Bs yield
vAt higher luminosity need more L1 BW to preserve current yieldvExpect ~2000 ev/fb-1
using additional Dsdecay modes
Current performance
4x1031 6x1031
8x1031
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Tev goals beyond 2003
v Fermilab has scaled down its plans for luminosity in June 2003Ø Silicon upgrade canceled!
No long shutdown in 2005Ø Design plan max luminosity: 2.94x1032
v No recycler ~ base plan0.080.08FY02
8.564.41Total
2.421.16FY09
2.371.14FY08
1.530.63FY07
0.890.50FY06
0.670.39FY05
0.380.31FY04
0.220.20FY03
Design planLuminosity/yr (fb-1)
Base plan luminosity/yr (fb-1)
Year
0123456789
0 1 2 3 4 5 6 7 8 9 10
End FY
fb-1
Base planDesign plan
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Impact on Higgs reach
v Reach for SM Higgs and other “new” physics searches affected by factor 2-3 reduction in expected total integrated luminosity (relative to 15 fb-1)
4.41 fb-1 base plan
8.56 fb-1 design plan
Sensitivity re-evaluated in June 2003Slightly better
Retain sensitivity to a low mass SM Higgs
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Impact on physics program
vEven 2 fb-1 represents x20 more luminosity than run 1ØMajor CDF/D0/Tevatron upgrade was fully justified by this
expected integrated luminosityvWe will get more than 2 fb-1, but not 15 fb-1 as the lab
made us hope for some timevImportant to make best of available luminosityØAll other upgrades needed for this
CDF is re-evaluating physics priorities and role of upgrades
ØFull support from Witherell, P5 and PAC on all other upgrades
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Upgrade del rivelatore al Silicio per CDF Run IIb
•Il progetto e’ stato cancellato in fase di Preproduzione:ØTutte le parti gia’ a SiDet in quantita’ (~15% del totale)ØSensori da HPK al terzo mese di produzione (~350 a SiDet)Ø“On schedule” per finire a Maggio ‘05 (18 mesi di anticipo rispetto alla data ufficiale di Nov ‘06).ØOttimi risultati su svx4 chip e ibridi §Costi stimati ridotti notevolmente
•Progetto di chiusura:ØCostruire 15 staves => installare nel prototipo di Barrel => el./mech. testsØCostruire 5 moduli di L0 => installare nelCF support structure => el./mech. tests ØInstallare L0 nel Barrel => e./mech. TestsØCirca 6 mesi con costi minimi (quasi tuttolabor cost)
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Summary of upgrade projects
v Calorimetry upgradesØ New central preradiator (CPR2) (see talk by Stefano Lami) (*)Ø Add timing to EM calorimeters (*)
v Tracking upgradesØ Full replacement of all silicon systems inside ISL (*)
v Trigger upgradesØ Improve resolution of L1 track triggerØ Rebuild global L2Ø Increase event builder throughputØ SVT upgrade (RW & associative memories) (see talk by P. Giannetti) (*New)
v DAQ upgradesØ TDC upgrade (speed up chamber readout)Ø Double SRC (speed up silicon readout) Ø CSL upgrade (double data logging bandwidth)
(*) Activities with contributions from Italian group
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Requests for upgrades
v Silicon à NONEØ Save 130 kEuro in 2003 + 150 kEuro in 2004! Ø Save 100 kEuro for additional SVT merger boards
v CEM timing à NONEØ Funding complete
v CPR2 (see Lami’s talk):Ø 100 kEuro in 2003 from SJ (Pisa)Ø 82 kEuro in 2004 (Pisa)
v SVT ass. Mem. Board upgrade (NEW see Giannetti’s talk)Ø 120 kEuro in 2004 (Ferrara)Ø 60 kEuro in 2004 (Pisa)Ø 150 kEuro in 2005
Total cost 330 kEuro
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Group composition
vCDF Italian group has grown by 20% relative to last yearØGood to have data!ØFuture activities important to keep the group together
2004 2004 2003 2003 2002 2002Fisici Tecnol. Totale Totale Totale Totale Totale Totale
Sezione Numero FTE Numero FTE numero FTE numero FTE numero FTEBologna 8 6.7 1 0.5 9 7.2 9 7.4 9 7.3CDF1-LNF 1 1 0 0 1 1 1 1 1 1Ferrara 3 0.7 1 0.1 4 0.8LNF 6 4 1 0.4 7 4.4 6 3.7 6 4.4Padova 15 11.3 0 0 15 11.3 13 9.2 14 9Pavia 1 1 0 0 1 1 1 0.7 1 1Pisa 32 26.9 11 6.6 43 33.5 33 25.4 28 20.6Roma1 11 9.5 2 1.5 13 11 13 11.1 12 10.1Trieste 5 3.6 0 0 5 3.6 5 3.7 3 2.1Udine 3 2.3 1 0.5 4 2.8 3 1.8 3 1.8Totale 04 85 67 17 9.6 102 76.6Totale 03 73 58.5 11 5.5 84 64.00Totale 02 68 52.2 9 5.1 77 57.3
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FY 2003 missioni/consumi
Sezione MI ME ConsumiNuovi fin. Nuovi fin. Sblocchi Sblocchi
BO 17 10LNF 16LNF-dot 7PD 35PV-dotPI 5 50 100RM1 40TSUD 1 25
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MOF
vNo developments since last meeting of IFC in AprilvNew IFC meeting deferred to end of October (maybe)ØPropose to fund as last year (250 kEuro)
20% increase in size of CDF Italian group overcompensates changein dollar exchange rate
ØThere may be a need for adjustment after the October IFC meeting if some agreement is found
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Summary of 2004 requests
Missioni Interne Missioni Estere Consumi Inventario Costruzione apparatiTotaliSEZ. Richieste Assegn. Richieste Assegn. Richieste Assegn. Richieste Assegn. Richieste Assegn. Richieste Assegn.
2004 2003 2004 2003 2004 2003 2004 2003 2004 2003 2004 2003BO 7.2 7 134.2 113.5 30.8 30 0 15 15 11 187.2 176.5FE-DOT 2 5 0 0 120 127 0LNF 4.4 4 100.6 91 11.6 7 5 4 0 120 121.6 226LNF-DOT 2 1 40 39 10 1.5 0 0 0 0 52 41.5PD 11.5 10 214.7 196 22.2 25 11 5.5 0 0 260.4 239PI 30 20 624.5 525 290 290 46 11.5 142 110 1137.5 958.5PV-DOT 2 2 27 8 2 1 0 0 0 0 31 11RM 13 6 308 233 60 18 20.5 12 0 0 401.5 269TS 6 4 100.5 61.5 11.5 7 291.5 267.5 0 0 413.5 340UD 6 3 97 88 8 4 6 1 0 10 119 106TOTALE 84.1 57 1651.5 1355 446.1 383.5 380 316.5 277 251 2850.7 2367.5
Includes all adjustments made after presentation of estimates in July 2003
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TeV Luminosity(old slide May 13, 2003)
vPeak luminosity still low but improvingØBest 4.2x1031
vDelivered/on tapeØ230/170 pb-1
Delivered
On tape
4x1031
LuminosityIntegrated
Initialinstantaneous
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Tev luminosity
v7 pb-1 /wk typicalØPeak 9.7 pb-1
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Tev goals beyond 2003
vFermilab long range plan (M.Witherell P5 presentation – March 26, 2003)
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Status of CDF
v Detector:Ø All systems commissioned and taking
good quality dataISL: more cooling lines opened during the January shutdown!
Only 1 cooling line (4% of total) remains plugged
Silicon (hardware/trigger) in general much more stable and reliable~90 % of all silicon systems currently taking dataL1 accept rate limitation removedSome unrecoverable damage is piling up
• % powered• % good• % bad• % error rate
January 03shutdown
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New silicon
vStatus similar to May 03
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Status of CDF
Early June 2002 March 2003
Silicon trigger coverage
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Status of CDF
v SVX electronics very delicateØ Still learning how
to protect it from further damage
Understand now much better sources of damage
Ø Some concern about possible continuous degradation over long periods of time
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L1 triggerv Require trigger deadtime < 5%v B triggers ~ 80% of L1, 50% L2/3Ø Fake rates higher than predictions
Level 1 Predictions
0
5
10
15
20
25
30
35
40
45
50
0 10 20 30 40 50 60 70 80 90 100Luminosity (e30)
Rat
e (k
Hz)
Predicted L1 rateVs luminosity
CurrentMax. lum
~18 kHz
18 kHz
4/4
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Bs trigger efficiency
vHard work has improved yields significantly
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Additional Bs channelsvBsà Ds π (Dsà πππ)
~30 events
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Measuring ∆ms
vIngredients:ØS = signal yieldØS/B = signal/BackgroundØσt = proper lifetime resolutionØ εD2 = flavor tagging power
ε = flavor tagging efficiencyD = flavor tagging dilution = 1-2w (w = flavor mistagging probability)
( )22
2
2
s tmS D SSignificance eS B
σε ∆−
=+
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Bs mixing
vLifetime resolutionØ67 fs NOWØ50 fs with event by event vertex and L00
vFlavor tagging studies in progressØLarge errors still on εD2 measurementsØTotal ~ 6% in Run 1 sin(2β) analysisØNow we have kaon tagging, but much more materialØNN like techniques could help tooØAssume (very conservatively!):
εD2 = 4% now (only SST, jet charge, lepton tags)εD2 = 5% later after including kaon tags
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Bs mixing
v 5σ measurementØ Feasible with moderate
improvements in 2 fb-1
v Can beat current world limit with 500 pb-1 and “current” performance
v Harder than expected: needs lot of work and luminosity/detector upgrades 0
5
10
15
20
25
30
35
0 500 1000 1500 2000
Moderate improvements
SM central value
Now
xs
pb-1
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Tevatron goals beyond 2003
vDuring the June PAC review the issue of the usefulness of the silicon upgrade was seriously considered, but deferred to after the July accelerator reviewØOther upgrades regarded as “…already desirable at
considerably lower luminosities.”vJuly DOE review of accelerator (Lehman) found the
design goals ambitious and the base goals rather safevOn September 3rd Witherell cancels silicon upgrade, but ØRun II will still have highest priority. Resources recovered
will be spent to improve TevatronØCommitted “…to complete the non-silicon parts of the CDF
and D0 upgrades.”
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Impact of new luminosity expectations
vImpact of smaller luminosity expectations can be reduced by appropriate upgradesØMost run IIb upgrades also help to make the best use of
available luminosityTrigger/DAQ upgrades:
Reduce fakes and therefore prescales for all B physics triggersIncrease bandwidth gaining effective cross-section for prescaled triggers
CEM timing and CPR upgrade:Improve S/N à allow reduced trigger/analysis thresholds for high pt
vCDF and the laboratory fully support all the non-silicon upgrades
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