CDF - Stato dell’analisi
World + CDF Run II
Marco Rescigno – INFN/Roma
CSN I Roma, 16 Maggio 2005
• Stato del Tevatron• Stato delle pubblicazioni• Risultati preparati per le
conferenze invernali– Breaking news
– Non solo Bs & MTop
• Enfasi sul lavoro italiano• Prospettive per estate ‘05 e
oltre– Physics case for 2009
M.Rescigno - Riunione CSNI 16 Maggio 2005
Luminosity Delivered/Recorded
0
1
2
3
4
5
6
7
8
9
0 1 2 3 4 5 6 7 8 9 10
End FY
fb-1
Base plan
Des ign plan
Run I statistics
M.Rescigno - Riunione CSNI 16 Maggio 2005
Integrated Lum to Date (FY05)
• In perfetta tabella di marcia per centrare il goal piu’ambizioso:– Design Plan = ~8fb-1
– Base Plan =~ 4 fb -1
M.Rescigno - Riunione CSNI 16 Maggio 2005
TeV Status
1 x 1032
• Tevatron plans:– Electron cooling
installed!• Commission by end of FY05• Expect 40% lum. increase
– Proton slip stacking• +25% p-bar production
acceptance
• Peak luminosity – Best 1.35 x1032 (12/5/05) !!!– Common > 1.0 x1032 Delivered
almost 1 fb-1 !– ~ 800 pb-1 on tape/experiment
• Data set used for these results– ~ 350 > 3-4 x Run 1
Peak Luminosity
Record: 1.35x1032 cm-2sec-1
Store efficiency
M.Rescigno - Riunione CSNI 16 Maggio 2005
Run IIb Triggers and Physics Priorities
• Even with all upgrades, we cannot maintain an “all inclusive” trigger table for Linst>1.5E32cm-2s-1
• We will be forced to sacrifice some fraction of our physics program at high luminosity
• Need to establish priorities based on physics goals:– RunIIb Physics Priorities and Triggers Committee
• Need to follow closely on-going trigger upgrades– Level 1 Track trigger (stereo matching – lower fake rate)– SVT (more patterns, faster processing) (see details)– Level 2 decision (x2 faster - done)– Event Builder, Level 3 (increase L2/L3 Bandwidth)– New TDC’s (faster redaout)– Data Logger (done)
By 2005
M.Rescigno - Riunione CSNI 16 Maggio 2005
Italian group contributions
• B/charm physics– Topics: Bhh (ACP, BR), bp, BsDs & lDs (for Bs mixing), Bs
BdK*, BK (ACP, BR), D0hh (BR, ACP), D+πππ, pentaquark search
– Groups involved: Padova, Pisa, Roma, Trieste
• High pt physics– Topics: Zbb, Higgs searches, top physics, hadronic top, top
backgrounds, b-tagging, W+jets, forward W’s– Groups involved: Bologna, Padova (Trento), Pisa, Roma
• Contributions to crucial analysis tools– Particle Identification with TOF and COT dE/dx– High-Pt btagging devel– Jet Energy resolution and scale
• Most work in close cooperation amongst Italian groups• A lot of work in close cooperation with non-Italian group
M.Rescigno - Riunione CSNI 16 Maggio 2005
Responsabilita’ Italiane nell’ analisi
• High-Pt B-tagging co-conveener (D.Jeans)
• Jet Energy resolution group (T.Dorigo)• All Hadronic Top analysis group (P.Azzi)
• B-group convener (S.Giagu)• CP violation and decays sub-group co-
conveener (S. de Cecco)
• Mixing Analysis Coordinator (F.Bedeschi)
M.Rescigno - Riunione CSNI 16 Maggio 2005
Run II Publications• 29 papers published or submitted• 34 under Collaboration reviewyear 2001
First CollisionCommissioning
2002First Physics
data
2003 2004 2005Goal
# of papers 4 17 8 + 34
2005 +Under ReviewPublished before 2005
HeavyFlavour
EWK/QCD
Top
Searches
• Searches and Top papers increasing their share
M.Rescigno - Riunione CSNI 16 Maggio 2005
Run II Inclusive Cross Section•Using Run I cone algorithm & unfolding
range increased by ~150 GeVSimilar result using Kt algorithm
(first time at collider)
•Comparison with pQCD NLO (JETRAD) (over almost nine orders of magnitude) disagreement at high Et reduced
Data syst. dominated by jet energy scale NLO error mainly from gluon at high x
No hadronization corrections appliedto NLO prediction relevant @ low
jetTE
M.Rescigno - Riunione CSNI 16 Maggio 2005
b/c cross sections
Beauty hadron productionPhys. Rev. D71, 032001 (2005) (30 pb-1 J/ trigger) Data 29.4±6 b
Theory (FONLL) 27.5 b OK!
Charm meson production Phys. Rev. Lett. 91, 241804 (2003)
(6 pb-1 SVT data only!)Theory: Cacciari,Nason (FONLL)JHEP 0309,006 (2003) OK!
High-Pt b-jet with vertex tag (300 pb-1 Jet Data)
1.4 higher than Pythia - NLO comparision soon
NEW !
M.Rescigno - Riunione CSNI 16 Maggio 2005
W/Z cross sections
• In accordo con il calcolo NNLO (Stirling, van Neerven)
• Sistematica sulla luminosita’ (6%) dominante
• PDF next (2%)
CDF 04()
CDF 04(e)
CDF04(e+)
CDF04(e, plug)
CDF04()
CDF 04(e)
CDF 04()
CDF04(e+)
CDF04()
M.Rescigno - Riunione CSNI 16 Maggio 2005
Testing ground for new Matrix Element MC generators (Alpgen)
Important background (when jet==b-jets) to top (and Higgs)
Syst. dominated by jet-energy scale.
Working now on:
W+Jet Cross Section
MC AlpGen + Herwig
AlpGen W+1, 2, 3, 4 partons ME calculation
Herwig W inclusive & parton shower
M.L.Mangano’s matching prescription to merge MC samples with different parton final states
Detailed kinematics checks
Reduce syst of jet correctionsZ+Jet W/Z+b-jets/c-jets with dedicated tagging
M.Rescigno - Riunione CSNI 16 Maggio 2005
W+bb/cc bkg is estimated via ALPGEN MC
Upper limits xBR derived using binned maximum likelihood technique to the di-jet mass distribution
Limits range from 5 to 3 pb for
110 GeV < MH<150 GeV. (better than Run I)
A First Look at WH in Run II
details
M.Rescigno - Riunione CSNI 16 Maggio 2005
Top pair Cross sections
•Molte nuove misure con ~300 pb-1 in differenti canali e con tecniche differenti•In accordo con la teoria, errore sistematico comparabile ~= errore sistematico teorico
Jet
M.Rescigno - Riunione CSNI 16 Maggio 2005
tt - All Hadronic Channel• Final State: 4 jets da W, 2 b-jets
(special multi-jets trigger)• Large statistics, but huge QCD
background: – S:B1:2500
• Increased S:B by requiring: ET>280GeV – Topological cuts (aplanarity, centrality)
• Event selection efficiency 6.7%o S:B 1:24
– @ least 1 b-tag jet: S:B 1:4
• Measure Xs with 8 Njets 6 & 1 b-tag jet
Updated Result (apr 05):
Obs.817 back.684• Prossimi step:• Nuova misura di sez. d’utro con background da MC (alpgen)• Misura della massa con metodo template
pbsyststattt 8.32.5
4.39.4 6.7)()(7.16.7
M.Rescigno - Riunione CSNI 16 Maggio 2005
Top mass is a fundamental SM parameter
CDF&D0RUNII
• Constrain Higgs mass in SM together with Mw and other electroweak precisionMeasurements•A key to understand electroweak symmetry breaking
Mtop vs MW
M.Rescigno - Riunione CSNI 16 Maggio 2005
W Mass
electron 200 pb-1 muon 200 pb-1
No result (yet), waiting among other thing next iteration PDF including new W charge asym. from CDFII
Run II: MW = xx.xxx ± 0.076 GeV (current estimated electron+muon syst.+stat. uncertainty)
Run I : MW = 80.433 ± 0.079 GeV
M.Rescigno - Riunione CSNI 16 Maggio 2005
W mass systematics
Work in progress on recoil modelWork in progress on e-energy scale (passive material)Now combined error is 76 MeV (stat+syst)
Expect 50 MeV combined (CDF only) by next yearGoal is ~ 20 - 30 MeV/experiment by end of run II
plots
M.Rescigno - Riunione CSNI 16 Maggio 2005
n
W+
W-
t
t
b-jet
b-jet
jet
jet
Mjj(W)
W ->2 jets calibrano la scala dei jet negli eventi top stessi
Stessa scala per b-jet e light quark (per ora)
Prima misura di Mtop con le nuove jet corrections Nel campione lepton+jet e’ possibile ricavare un
constraint ulteriore alla scala dei jet dal Wjj Fit contemporaneo 2-D alla massa del top e alla
scala dei jet (JES) Considerato sin dai tempi del TDR come il
metodo migliore per CDF II
Mtop con “in-situ” jet calibration
Cruciale avere un elevato numero di double b-tagged events
Riduzione del combinatorio nell’assegnazione dei jet ai partoni (contibuto dominante alla larghezza sperimentale del picco di top)
RUNI
5 events
M.Rescigno - Riunione CSNI 16 Maggio 2005
Determine true “parton” E from measured jet E in a cone 0.4
Correction to central region using dijet balance: to make response uniform in
Correction to particle jets using dijet MC tuned for single particle E/P, material, and fragmentations: due to non-linear and non-compensating cal.
Out-of-Cone :correction to parton”top-specific correction” to light quark jets and b-jets separately
Jet Energy correction
Non-uniform response
Diff. resp.of /i+-Non-linearity
Shower, frag.
M.Rescigno - Riunione CSNI 16 Maggio 2005
Jet-energy scale Syst. migliorata di un fattore 2 rispetto al 2004:•Calorimetri ricalibrati •Migliore simulazione Monte Carlo del detector•Procedura rivista completamente
La sistematica e’ ora meglio o allo stesso livello che nel Run I.
RunII
RunII 2004
RunI
Frac. Syst. uncert. vs Pt
Central region
Scala dell’energia dei Jet
M.Rescigno - Riunione CSNI 16 Maggio 2005
2 7 GeV/c)JESstat(5.31M 7.36.3top
Expected error
mt e mjj dal fit 2-d
2tag 1tagT 1tagL 0tag
bkgds 0.7+-0.2 7.6+-1.2 10.2+-1.7 no est
Data 16 57 25 40
Bkg details
)stat(10.0JES 78.0
80.0
M.Rescigno - Riunione CSNI 16 Maggio 2005
Combined Mtop and JES Fit20% improvement in JES
2 7 GeV/c)JESstat(5.31M 7.36.3top
)stat(10.0JES 78.0
80.0
2 7 GeV/c)JESstat(2.31M 1.41.4top
Mtop summary
Compare to 1D Template fit
2
2
7
7
GeV/c5.31
GeV/c )(7.1)JESstat(5.31M1.40.4
7.36.3top
syst
Add other systematics B-jet scale Background shape
(details)
M.Rescigno - Riunione CSNI 16 Maggio 2005
Fin qui la misura mondiale piu’ precisa in lepton+jets channel at CDF con “in situ” JES
Ulteriori misure verranno updatate presto:- Lepton+Jets con Matrix Element- Dilepton con Matrix Element,
neutrino weighting Il “blue band” plot ricomincia a
muoversi spesso!
Outlook su Mtop
Assumendo 1 GeV/c2 sistematico totale (ora 1.7) a parte la JES
Mtop < 2 GeV/c2 solo con questa tecnica e in questo canale con ~2 fb-1 di Run II
Con Jet probability tags il numero di eventi double tag e’ in linea con le previsioni
M.Rescigno - Riunione CSNI 16 Maggio 2005
b-jet energy scale and resolution
• Studies on b-jet energy scale using Zbb (dedicated trigger – italian achievment!)
• Z(bb) peaks in the right place within 2% (statistical error) using default corrections
• S/B enough to even better constrain b-jet energy scale with more data
• Good testing ground for developing advanced jet algorithm
Run I
M.Rescigno - Riunione CSNI 16 Maggio 2005
B-physics highlights• Primi risultati sul mixing del Bs• Prospettive per l’osservazione del
fenomeno• Non solo mixing
– Charmless decays
– Bs lifetime difference
– Indirect searches
M.Rescigno - Riunione CSNI 16 Maggio 2005
Experimental lower limit on ms
ms constraint to U.T.
Fit with all constraints (winter 05):ρ = 0.190 ± 0.044 η = 0.349 ± 0.024
UT triangle & ms
M.Rescigno - Riunione CSNI 16 Maggio 2005
Δms = 20.5 ± 3.2 ps-1
[14.4, 27.1] @ 95% CL
ms = 18.9 ± 1.6 ps-1
[15.7, 23.0] @ 95% CL
SM CKM-fit prediction for ms
New Physics @ 3 If ms > 30 ps-1 By 2010 with expected exp. and th. ImprovementsNew Physics @ 3If ms > 25 ps-1
(with all constraints)(Δms not used) compatibility plot
UT triangle fit
M.Rescigno - Riunione CSNI 16 Maggio 2005
Kaon
Analysis Strategy
• Bs signal collection and reconstruction– semileptonic: lepton + 1SVT trk – fully hadronic: 2 SVT track
• Bs decay time–check ability to properly measure lifetime despite SVT trigger bias –proper time resolution
• Tag initial flavour of the Bs
– Use leptons and Jet Charge on opposite side– calibrate on Bd mixing
Bs Mixing– performed a “Blind Analysis”
M.Rescigno - Riunione CSNI 16 Maggio 2005
CDF “Bs Mixing Group”• ~70 physicists ( 22 italians, 9 phd/post-doc) in CDF are actively involved in the Bs mixing project– Improving the trigger strategy– Understanding the detector– B Lifetime Measurements– Flavor Tagging– B0 Mixing– Bs Mixing
• Big collaborative effort:–Analyse 3 different datasets–Reconstruct 0(20) different decay modes–Perform 2 parallel analysis for both hadronic and semileptonic modes–Study 4 different tagging algorithms–TOF and dE/dx calibrations
M.Rescigno - Riunione CSNI 16 Maggio 2005
Hadronic Bs signals
)(0 Sss DDB][ KK
NBS = 526±33
S/B ~ 2
M 15 MeV
)(
)(00
**0
ss
ssss
DB
DDDB
“Satellites”:
( Not used in this analysis )
Other signals
M.Rescigno - Riunione CSNI 16 Maggio 2005
Semileptonic Bs Signals
•Missing PT No Bs mass peak
•Use Ds mass signals
•Charge correlation between ℓ and Ds
– ℓ + Ds- : “Right-sign” = signal
– ℓ + Ds+ : “Wrong-sign” = background
• Right-sign peak is not pure signal– ~20% background:
» Ds + fake lepton from primary
» B0,B+ Ds D X with D ℓ X
» c-c backgrounds
SD
D
)(0 Sss DXlDB Other signals
M.Rescigno - Riunione CSNI 16 Maggio 2005
Signal yields summary
BsDsDs 526±33 (1.8)
BsDsDsK*K 254±21 (1.7)
BsDsDs 116±18 (1.0)
B+D0D0K ~6200
B0D*+D*+D0 ~2800
B0D+D+K ~5600 Bsℓ Ds ; Ds 4355±94 (3.1)
Bsℓ Ds ; Ds K*K 1750±83 (0.4)
Bsℓ Ds ; Ds 1573±88 (0.3)
B+ℓ D0 ; D0 K ~100K
B0ℓ D*+ ; D*+D0 ~25K
B0ℓ D+ ; D+ K ~52K
(S/B)
(S/B)
Hadronic Bs modes~900 events
Semileptonic Bs modes~7700 events
O(104) calibration modes
O(105) calibration modes
M.Rescigno - Riunione CSNI 16 Maggio 2005
Hadronic B-lifetimes results
(B+) = 1.66 ± 0.03 ± 0.01 ps (B0) = 1.51 ± 0.02 ± 0.01 ps(Bs) = 1.60 ± 0.10 ± 0.02 ps
Systematic summary
(B+)/(B0) = 1.10 ± 0.02 ± 0.01
(Bs)/(B0) = 1.06 ± 0.07 ± 0.01
± (stat) ± (syst)
(B+) = 1.653 ± 0.014 ps (B0) = 1.534 ± 0.013 ps(Bs) = 1.469 ± 0.059 ps
HFAG 04 average
(B+)/(B0) = 1.06 ± 0.02
(Bs)/(B0) = 1.00 ± 0.01
Theory prediction:
M.Rescigno - Riunione CSNI 16 Maggio 2005
Bs decay time resolution
• Hadronic:– <ct
0>: ~ 30 m (100 fs)– p/p < 1%
• Semileptonic– <ct
0>: ~ 50 m (167 fs)– p/p ~ 15% (K factor due to missing neutrino)
2
20
p
ct pctct
Vertex resolution(constant)
Momentum resolution
(proportional to ct) Hadronic
Semileptonic
ctps
(ct
)
M.Rescigno - Riunione CSNI 16 Maggio 2005
Flavor tagging – Soft Leptons
Tag type D2 (%)
Muon (0.70±0.04)%
Electron (0.37±0.03)%
2ndary vtx (0.36±0.02)%
Displaced track
(0.36±0.03)%
Highest p jet (0.15±0.01)%
Total (exclusive)
~1.6%
Run
I
Run
II
M.Rescigno - Riunione CSNI 16 Maggio 2005
Flavor tagging – Jet Charge
Tag type D2 (%)
Muon (0.70±0.04)%
Electron (0.37±0.03)%
2ndary vtx (0.36±0.02)%
Displaced track
(0.36±0.03)%
Highest p jet (0.15±0.01)%
Total (exclusive)
~1.6%
Run
II
Run
I
M.Rescigno - Riunione CSNI 16 Maggio 2005
Amplitude Scan for B0d(s)
•Introduce “Amplitude” in Likelihood
• Amplitude scan– Fit the amplitude for fixed m• Amplitude: A, uncertainty: A
– Repeat the fit with different m
•Amplitude will be consistent with– 1 if there is mixing at the frequency m – 0 if there is no mixing
• Example for B0 Hadronic sample– Amplitude = 1 at m = 0.5 ps-1
– Amplitude = 0 at m >> 0.5 ps-1
tmcosDAeL /ttsig 1
1
Hadronic B0 sample
• 95% CL limit is : ms > 14.5 ps-1
• Sensitivity: 18.2 ps-1
M.Rescigno - Riunione CSNI 16 Maggio 2005
Amplitude Scan result
Hadronic has no sensitivity (yet) but is better behaved at high
ms**Systematic errors are negligible with respect to statistical in both cases**
details
M.Rescigno - Riunione CSNI 16 Maggio 2005
CDF+World Combined Result
• World Average + CDF Run II– Sensitivity: 18.6 ps-1
– Limit 14.5 ps-1
•CDFII combined result•Sensitivity: 8.4 ps-1
•Limit: ms > 7.9 ps-1 @ 95% CL
M.Rescigno - Riunione CSNI 16 Maggio 2005
Future perspectivesWith the same data:
• Add new tagging algorithm Same Side Kaon Tag• Incremental changes in existing algorithm (new Jet Charge +20% D2)• Add more channels
•BsDs3•BsDs*
• Add signals from other triggers• Improve decay time resolution with PV event by event (detail)
With new data:
• Increased Luminosity• Use new trigger strategies
•2 SVT Tracks + oppsite side muon (pt>1.5 GeV) at trigger level (already in place since summer 2004 Can take data even at higher luminosity)
M.Rescigno - Riunione CSNI 16 Maggio 2005
Same side Kaon tagging
B0
B-
Bs
K*0
K+
K- K*0
Exploits the charge correlation between the b quark and the leading product of b hadronization.
B+ case is complicated by the contributionof excited Bd and Bs states
Already used in md measurement,gives an D2 = 1.1 0.4 %
SS Kaon tag possible with PIDIssues:•Need to know D2 to set a limit on md
•Try to get it from MC•Underlying event backgound
M.Rescigno - Riunione CSNI 16 Maggio 2005
MC-data comparison with PID
Apply PID, T.O.F. and dE/dx combinedIn a Likelihood approach L(K)/L()
good agreement!Issues:•Particle fractions in MC•PID resolution tuning•backgrounds
# “Kaons”
Plong “Kaons”
M.Rescigno - Riunione CSNI 16 Maggio 2005
Verso il 2009 – Bsmixing
• Estrapolazione in forma analitica (riproduce attuale risultato con gli appropriati input)
• Si assume di integrare la meta’ della luminosita’ dal 2007 in poi (B-physics solo da meta’ store)
• Sensibilita’ al range favorito dal fit di unitarieta’• In case of no signal 95% C.L. up to 30 ps-1 with 4 fb-1 • Improvement all’analisi credibili ma labor-intensive…. More proj
ections
M.Rescigno - Riunione CSNI 16 Maggio 2005
B hhDecadimenti Charmless del Bs:
• Constraint su da misure di BR• Test delle violazioni di SU(3)
nei conti teorici• Misura pulita di in futuro
• Risultati basati su 180 pb-1
presentati a ICHEP04:– Branching fractions– BdK CP asymmetry– Limiti su processi rari
• Analisi raffinata in vista della pubblicazione
• migliore modellizazione risposta dE/dx
• Sistematiche ridotte Preblessed 12 Maggio!
M.Rescigno - Riunione CSNI 16 Maggio 2005
Bhh results• Branching ratios and CP asymmetry new(previous)
• Rare two body decay modes
CDF/180 pb-1 Babar/200 fb-1 Belle//140 fb-1
N(BdK+) 536 (509) 1600 1030
ACP (BdK+) -0.022±0.078±0.004(-0.04±0.08±0.01)
-0.133±0.030±0.009
-0.088±0.035±0.013
BR()/BR(K) 0.206±0.052±0.017 0.239±0.056±0.036)
0.25± 0.04 0.24 ± 0.04
fs/fd
BR(BsKK)/BR(BdK)
0.463±0.079±0.061 (0.496±0.087±0.093)
- -
0.52±0.12 (hep-ph/0402112)
Large SU(3) breaking
M.Rescigno - Riunione CSNI 16 Maggio 2005
Bhh results• Branching ratios and CP asymmetry new(previous)
• Rare two body decay modes
BR/10-6 @ 90% C.L. CDF/180 pb-1 PDG 2004 TheoryBR(BdK+) <1.8 (<3.1) <0.6 [0.01-0.2] QCDF
BR(Bs+) <1.6 (<3.4) <170 [0.03-0.16] QCDF0.42 ± 0.06 PQCD (hep-ph/0404028)
BR(Bs+) <5.4 (<7.4) <210 [6-9] different approaches
M.Rescigno - Riunione CSNI 16 Maggio 2005
Bhh futuro a breve• Nuovo S/W di ricostruzione e
360 pb-1 (fino ad Agosto 2004)
• Combined yield 2700 ev!– Was 900 ev. with 180 pb-1
• 1600 BdKfactories)• Ci si aspetta una risoluzione
del 4% su ACP
• BsKvisibile o contraddizione con la teoria– ACP attesa grande
• Annichilation mode Bspossibile (analisi dedicata)
• Misura della vita media nel decadimento BsKK– dovrebbe essere ~consistente
con la vita media dello stato Light del Bs
M.Rescigno - Riunione CSNI 16 Maggio 2005
Bs J/ and• BS J/ +- K+K-
• BVV decays: Heavy and Light state decay with distinct angular distributions and different lifetimes.
Back
• Result (260 pb-1)– 1/4 heavy - 3/4 light state– Lifetime - heavy ~ 2 x light
S / S = 0.71 +0.24-0.28 ± 0.01
• Lifetime difference measures“same” CKM element as m (oscillation frequency)
• Exciting!! Need more data– ~ 5 % sensitivity by 2009 ms = 10 ps-1 S / S = 7%
• Test still possible CP violation effect in Bs mixing
M.Rescigno - Riunione CSNI 16 Maggio 2005
Bs→
Charmless BVV decays
Bd→K*
estimated yield:
123 events
estimated yield:
44 events
Bs→ 12 events (170 pb-1) 44 events (360 pb-1)
•Measured ) with 180 pb-1
•Updatee with 360 pb-1
•Will measure polarization soon with significance similar to what is seen at B-factories
M.Rescigno - Riunione CSNI 16 Maggio 2005
Rare decays: Bs
• Chiaro segnale di Nuova Fisica: – SUSY tan6
• Correlato con g-2 anomaly
• Serrata competizione tra CDF e D0:– Nuovo limite da CDF: maggiore accettanza
(forward muon) + analisi multivariata CDF-04 CDF-05 D0-05 D0-05 BaBar
Luminosity 171 pb-1 365 pb-1 240 pb-1 300 pb-1 111 fb-1
Bs→ 90% (95%) 5.8x10-7(7.5x10-7) 1.6x10-7(2.0x10-7) 4.1x10-7(5.0x10-7) (3.7x10-7)
Bd→90% (95%)1.5x10-7(1.9x10-
7)
4.2x10-
8(5.5x10-8) 8.3x10-8
SM Expectations
BR(Bs(d)) =
3.5x10-9 (1.0x10-10) SM diagrams SUSY diagrams
G. Buchalla, A. Buras, Nucl. Phys. B398,285
M.Rescigno - Riunione CSNI 16 Maggio 2005
Verso il 2009 – Bs
• Estrapolando l’attuale analisi• Limite asintotico 2E-8 (4-5E-8 con 4 fb-1)• Sensibilita’ al range favorito in molti scenari esotici
R. Dermisek et al., hep-ph/0304101
7.510-7
SO(10)
Escluso con questi
parametri dal n
uovo
risulta
to
M.Rescigno - Riunione CSNI 16 Maggio 2005
J. Ellis et al., hep-ph/0504196CSSM
Verso il 2009 – Bs
• Estrapolando l’attuale analisi• Limite asintotico 2E-8 (4-5E-8 con 4 fb-1)• Sensibilita’ al range favorito in molti scenari esotici
2E-8
5E-8
CDM
bs
M.Rescigno - Riunione CSNI 16 Maggio 2005
Conclusions• Tevatron is picking up
– Could exceed even best luminosity expectations!• A diverse physics program is in full swing• On course for:
• Detailed tests of QCD• Top mass resolution ~ 2 GeV/exp• W mass resolution ~ 30 MeV/exp• Bs mixing observation (and much more in B sector)• Setting strong limits on new physics and developing
technology for Higgs searches in many channels
• Italian doing excellent work across the board (both on the detector/upgrades and analysis)
• With a consistent Tevatron performance we may observe hints of New Physics (direct or indirect) before LHC turns on!
M.Rescigno - Riunione CSNI 16 Maggio 2005
The Upgraded CDF Detector
New
Old
Partially new
Forward muonEndplugcalorimeter Silicon and drift
chamber trackers
Central muonCentral calorimeters
Solenoid
Front endTriggerDAQOffline
TOF
Back
M.Rescigno - Riunione CSNI 16 Maggio 2005
Forward W’s
=2.874±0.034(stat)±0.167(syst)±0.172(lum) nb
Study of forward W’s improved by better tracking and simulation
180 pb-1
Spring 0464 pb-1
M.Rescigno - Riunione CSNI 16 Maggio 2005
Rare Decays
• Sensitive to SUSY– Bs results @ 95% CL
BNL: E821Jan. 2004
CDF 365 pb-1
CDF - Run I
D0 300 pb-1
Back
M.Rescigno - Riunione CSNI 16 Maggio 2005
Charm and Bottom Physics• 9 papers published or submitted
– Ds, D+ mass difference (Phys. Rev. D68, 072004, 2003)– Search for D (Phys. Rev. D68, 091101, 2003)– Prompt Charm cross section (Phys.Rev.Lett.91, 241804(2003)– Observation of X(3872) - used 220pb-1 (PRL)– D0 relative BR and CP asymmetry (123 pb-1) - PRL – Inclusive J/ and B cross sections (40 pb-1) - 1st draft– Hadronic Moments in semileptonic B decays (180 pb-1)– BR and CP Asymmetry in B+ K+ and BR in Bs (180 pb-1)– Lifetime Difference in Bs system (220 pb-1)
• 9 analyses in godparent publication review– PentaQuark search: 3/2(1862) (220 pb-1)– B hadron masses including Bs and b (220 pb-1)– BR of b c (65 pb-1)– BR of Bs Ds / BR of B0
D- + (64 pb-1)– BR of Cabbibo suppressed B+ J/ + – BR and CP Asymmetry in B hh’(180 pb-1)– Search for b ph(180 pb-1)– Bc mass in J/mode– X(3872) dipion mass– Bs (2s) decay BR
M.Rescigno - Riunione CSNI 16 Maggio 2005
Top Physics• 6 paper published or submitted
– Top cross section in di-lepton (197 pb-1) – PRL– Top pair cross-sections in lepton+jets
• Kinematics• Secondary vertex b-tag + kinematics - PRL • Secondary vertex b-tag
– Search for anomalous kinematics in dilepton sample– Single top
• 9 analyses in godparent publication review– Top pair cross-sections
• Soft muon b-tag• tau dilepton• Methods combination
– W helicity– BR(t Wb) / BR(t Wq)– Top mass (162 pb-1)
• Dynamic Likelihood (lepton+jets)• Multivariate (lepton+jets)• Template (lepton+jets)• dilepton
M.Rescigno - Riunione CSNI 16 Maggio 2005
Electroweak and QCD Physics
• EWK: 7 paper submitted– W, Z cross section in e, channel (72 pb-1) – PRL– WW cross section in dilepton channel (197 pb-1) - PRL– Forward-backward asymmetry in Z/ e+e- (72 pb-1) - PRD – WZ+ZZ cross section limit (197 pb-1) – W charge asymmetry (170 pb-1)– W, Z cross section e, channel (202 pb-1)– W, Z cross section e, µ channel (72 pb-1), PRD
• EWK: 1 analyses in godparent publication review– W mass (200 pb-1)
• QCD: 2 papers submitted– Jet shapes/energy flow using the MidPoint Algorithm (170
pb-1)– Diphoton cross section
• QCD: 2 papers under review – b-jet cross section – Jet cross secion (cone)
M.Rescigno - Riunione CSNI 16 Maggio 2005
Higgs and New Phenomena
• 6 papers published or submitted– Bd, Bs µµ (PRL)– Search for H++ ee, µµ, eµ (PRL)– Stable H++ (PRL)– Search for 1st and 2nd generation leptoquarks (PRL)– e* ePRL)– Diphoton + missing ET cross section
• 14 analyses in godparent publication review– Search for Z’ ee, µµ– Search for leptoquarks in missing ET
– WH standard model cross section limit– H diboson cross section limit– Magnetic monopole search– Search for sbottom from gluino decay– Search for W’ e– WH lnbb– High Mass pair– Higgs decaying in pair– Stop charm + LSP– High Mass sds– Charged Higgs In Top decay– Bd, Bs µµ (360 pb-1)
M.Rescigno - Riunione CSNI 16 Maggio 2005
• Speed up SVT execution– cope with high lumi– reduce dead-time– extra features
• forward muon/electron trigger• increase coverage e.g. beam spot
• How to do that?– more powerful Associative Memory (32k --> 512k
patterns)• Improve pattern recognition resolution
– Reduce number of roads to fit
– Replace AMS, RW, HB, TF with Pulsar boards• Support 512k pattern/wedge• Faster track fitting
SVT updrade details
back
M.Rescigno - Riunione CSNI 16 Maggio 2005
• Fermilab goal was to install during the shutdown
• Shutdown postponed to October (at least)
• Planning to install 128kpatterns per wedge by June/July
• Hopefully install also new TF
• Take advantage, as soon as possible, of
• better AM resolution
• RW function moved before HB
• faster TF
Installation Plan
M.Rescigno - Riunione CSNI 16 Maggio 2005
Run I Jet Results
Run I data compared to pQCD NLO
Observed deviation in tail …….. was this a sign of new physics ?
7.0 || 1.0 jet
TeV 8.1s
back
M.Rescigno - Riunione CSNI 16 Maggio 2005
Jet Production with KT
• Inclusive KT algorithm
•Good agreement Data vs Theory•High-Pt tail to be watched
closely…
•KT works in hadron collisions !
relevant for LHC strategies
2
2,2
,2 ),min(
DR
PPd jTiTij
2, )( iTi Pd
NLO not corrected for Hadronization & Underlying Event (this will be important at low Pt)
M.Rescigno - Riunione CSNI 16 Maggio 2005
Run II -> kT algorithm
1. For each object i with PTi define dii =(PT
i)2
2. For each pair of objects i, j define:
3. If the min of all dii and dij is dij, i and j are combined; otherwise i is defined as a jet
4. Continue until all objects are combined into jets
2
2,2
,2 ),min(
DR
PPd jTiTij
∆R2=(∆φij)2 + (∆ηij)2 ;
• particles with overlapping clusters are unambiguously assigned to jets (no merging/spitting problems)
• same jet definition at the parton and detector level
• difficulties in the definition of the underlying event
back
M.Rescigno - Riunione CSNI 16 Maggio 2005
I.P.B
Secondary Vertex tagging: tracks with significant IP are used in a iterative fit to identify the secondary vertex inside the jet
For double tag searches,efficiency factors get squared! To retain signal, we need to have loose and tight tagging options
Soft lepton tagging SECondary VerTeX tagging Jet Probability tagging
Tagging Algorithms:
Efficiency drops at low jet Et and high rapidity but is 45-50% for central b-jets from Higgs decayMistag rates are kept typically at 4-5%
B-tagging performance
M.Rescigno - Riunione CSNI 16 Maggio 2005
Search for WH in Run 2WH →lνbb is a promising channel for CDF to isolate the H→bb decay.
Initial data sample: inclusive lepton triggers, 162 pb-1
Basic Selection: e/µ (20 GeV), missing ET + 2 (15 GeV and || < 2) jets (one b-tagged) i.e. W+2jets signature
Main background: QCD and W+jets production, top
Top veto: no extra jets with ET > 8 GeV, veto on isolated 20 GeV track with opposite charge wrt the lepton
Non top bckg enter the signal sample when either a b-jet is tagged or light quark jet is mis-identified as heavy flavour jet by the tagging algorithm.
W+bb/cc bkg is estimated via ALPGEN MCNon W bkg: i.e. events w/ mis-identified lepton
Obs 62 evts
Exp 66.5±9.0
Low Mass
back
M.Rescigno - Riunione CSNI 16 Maggio 2005
Jet energy measurement
needed to say something on Higgs before LHC
BASEDESIGN
Lu
m (
fb-1)
10 %
• Combine Calorimeter and tracking info
• b-jet correction from Zbb study
• Additional correction bring di-jet resolution on MC close to 10%
M.Rescigno - Riunione CSNI 16 Maggio 2005
Top Backgrounds• W+heavy flavor jets(bb,cc,c)
– Heavy flavor fraction from MC– Normalized to data
• W+jets(mistag)– Use measured mistag rate, applied
to the data
• Multijet:fake-W (jete, track)– Estimated from data
• Single top, diboson (WW,WZ)– Estimated from MC
2tag 1tagT 1tagL 0tag 2 tag J+S
bkgds 0.7+-0.2 7.6+-1.2 10.2+-1.7 no est 1.2 +-0.6
Data 16 57 25 40 18
>=1-btag
controlsignal
Not
use
d
here
back
M.Rescigno - Riunione CSNI 16 Maggio 2005
2 7 GeV/c)JESstat(5.31M 7.36.3top
Expected error
mt dal fit 2-d
2tag 1tagT 1tagL 0tag
bkgds 0.7+-0.2 7.6+-1.2 10.2+-1.7 no est
Data 16 57 25 40
Bkg details
M.Rescigno - Riunione CSNI 16 Maggio 2005
)stat(10.0JES 78.0
80.0
Expected error
Scala dei Jet dal fit 2-d
M.Rescigno - Riunione CSNI 16 Maggio 2005
Systematic TMT 2-D TMT 1-D
Mtop (GeV)Mtop (GeV) JES()
JES (2.5 ) - 3.1
b-jet modeling 0.6 0.25 0.6
ISR 0.4 0.08 0.4
FSR 0.6 0.06 0.4
PDFs 0.3 0.04 0.4
Generators 0.2 0.15 0.3
Bkgd shape 1.1 0.17 1.0
b-tagging 0.1 0.01 0.2
MC statistics 0.3 0.04 0.4
Method 0.5 0.02 -
TOTAL 1.7 0.36 3.4 = 3.1 1.4
Sistematica Mtop
back
M.Rescigno - Riunione CSNI 16 Maggio 2005
qq -> tt vs
How to control ISR? In Run I, switch ISR on/off using PYTHIA, Mtop = 1.3GeV In Run II: systematic approach
ISR/FSR effects are governed by DGALP evolution eq.:<Pt> of the DY(ll) as a function of Q2
(2Mt)2
log(M2)
ISR syst: 0.4 GeV
Pt(tt) at generator
+
-
back
M.Rescigno - Riunione CSNI 16 Maggio 2005
Run I & II misure precedenti Consistency among different
channels? Are we looking for same top? Non-SM decays make different (like t->bH+)
All of previous RunII measurements haven’t reached RunI precision (Jet energy scale syst.)
RunII goal mtop is about 2 GeV
M.Rescigno - Riunione CSNI 16 Maggio 2005
Hadronic Bs signals (2)
)(0 Sss DDB)( 0*0 KKDDB Sss
NBS = 254±21 NBS
= 116±18
M.Rescigno - Riunione CSNI 16 Maggio 2005
Semileptonic Bs Signals (2)
)( 0*0 KKDlDB Sss )(0 Sss DlDB
1573±88 events 1750±83 eventsback
M.Rescigno - Riunione CSNI 16 Maggio 2005
Lifetime in the semileptonic Bs modes
c = 455.9 11.9 m c = 422.6 25.7 m c = 413.8 20.1 m
Combined ℓ-Ds lifetime result: 445.0 9.5 m (W.A.: 438 17 m)
statistical err .only, NOT for Averages (DØ ’05: 426 13 17 m)
Real Ds backgrounds: prompt and physics
M.Rescigno - Riunione CSNI 16 Maggio 2005
B0 mixing and dilution scaling• Validation of the flavor tag calibration using B0 and B+ sample – B0 D, B+ D0– B0 J/K*0, B+ J/K
• Event by event predicted dilution Dfrom the flavor tag calibration
•Fit the “Dilution scale factor” S– =1 if the tag calibration is correct.– 5 scale factors for 5 tag types
•Effective Dilution depend on detail of the samples (e.g. Pt spectra)
Scale factors are then used for Bs mixing analysis for hadronic channelsSame thing for semileptonic decays
DSeB
tmDSeBt
dt
1:
)cos(1:/
/0
B0 all Tags
B+ all Tags
M.Rescigno - Riunione CSNI 16 Maggio 2005
B0 mixing results
• md consistent with WA: 0.510±0.005 ps-1
• Total D2: 1.1—1.4%• All dilution scale factors consistent with 1– Hadronic: 15~25% uncertainty– Semileptonic: 5~15% uncertainty
HADRONIC SEMILEPTONIC
md (0.503±0.063±0.015) ps-1
(0.498±0.028±0.015) ps-1
Total D2 (1.12±0.23)% (1.43±0.09)%
Dilution scale
SMuon 0.83±0.10±0.03 0.93±0.04±0.03
Electron 0.79±0.14±0.04 0.98±0.06±0.03
Vertex 0.78±0.19±0.05 0.97±0.06±0.04
Track 0.76±0.21±0.03 0.90±0.08±0.05
Jets 1.35±0.26±0.02 1.08±0.09±0.09
M.Rescigno - Riunione CSNI 16 Maggio 2005
HadronicSemileptonic
Systematic Uncertainties
•Physics background at low ms
•Prompt background at high ms
•Dilution scale factors and templatessystematic limited from control samplestatistics
**Systematic errors are negligible with respect to statistical in both cases**
back
M.Rescigno - Riunione CSNI 16 Maggio 2005
Other channels, example
•13323 Bs candidates
•Already used for lifetime
•But not for mixing
•20% statistics
ss DB0
example
M.Rescigno - Riunione CSNI 16 Maggio 2005
c resolution improvements
• No EbE/L00: ~ 67 fs
• With EbE/L00: ~ 47 fs– 30%
improvement
• Not fully exploited yet (only L00)
back
M.Rescigno - Riunione CSNI 16 Maggio 2005
Is MC describing the data?
One possible way to solve the issue of having a prediction for theSSKT dilution is to extract it from MC.Compare DATA with Pythia b-antib production and hadronization with allthe processes on, underlying event “tune A” from HF x-sec. CDF data.
Look at the charged tracks in a cone of R=0.7 around the Bs (no PID)
# tracks Plongitudinal
First order good agreement
M.Rescigno - Riunione CSNI 16 Maggio 2005
TOF: >1 K/π separation up to p=2 GeV
Basic tools: PID
dE/dx in COTK/π sep. >1.4@Pt>2GeV
pK
•Improved TOF calibration (better resolution)+ t0 (reduced tails)
•Improved COT dE/dx calibration over wider range
•J/ee, ee•J/mm•D*±D0 s(k) s
• p
Combine TOF+COT in a likelihood ratio usable for all momentum range!
M.Rescigno - Riunione CSNI 16 Maggio 2005
Verso il 2009 – Bsmixing
• Estrapolazione in forma analitica (riproduce attuale risultato con gli appropriati input)
• Si assume di integrare la meta’ della luminosita’ dal 2007 in poi (B-physics solo da meta’ store)
• Sensibilita’ al range favorito dal fit di unitarieta’• In case of no signal 95% C.L. up to 30 ps-1 with 4 fb-1 • Improvement all’analisi credibili ma (meno) labor-intensive….More proj
ections
M.Rescigno - Riunione CSNI 16 Maggio 2005
Bd(s)hh’ penguin and tree
Amplitude ~ T
Tree
Amplitude ~ P
Penguin
ii
ii
edeCKK
deeC
2
2
2s
d
1
2/1)A(B
)A(B
; ddAmplitudes related by U-spin symmetry of strong interactions (sd interchange) !
C, C’ : CP conserving strong amplitudes
d, d’ : “penguin to tree ratio”
, ’ : strong phase difference between penguin and tree
Glossary
M.Rescigno - Riunione CSNI 16 Maggio 2005
Bhh observablesMany related observables determine the angle using BsKK/Bd CDF data alone
Time dependent CP asymmetry requires b-flavor tagging and need more statistics
(a major goal for CDF Run II)
pssd
K
Fdd
dd
C
C
BR
KKBRR
dd
dd
KBR
BR
f
fH
2
2
21
22
21
22
2
2
d
s
2
21
22
21
2
2
d
d
2
2
2
coscos21
coscos21
)B(
)B(
coscos2
coscos21
)B(
)B(1
R.Fleisher hep-ph/0405091;
D.London, J.Matias hep-ph/0404009
Phase space factor = 0.92QCD sum rules: 1.76+0.15-
0.17 (A.Khodyamirian et al., Phys.Rev D68 114007)
Branching Ratio measurements can constrain theory too!
M.Rescigno - Riunione CSNI 16 Maggio 2005
Current single best measurement(BaBar)
Scaling from current yields
Bhh verso il 2009
Stime non aggiorn
ate
M.Rescigno - Riunione CSNI 16 Maggio 2005
lepton+track triggered dataset 195 pb-1Signal consists in a tau pair (had, tau → e/µ) Hadronic taus appears as narrow jets that are reconstructeded by using both tracking and calorimetric quantities.
Signal and isolation cone are used to select good candidates.
The production x-sec of the CP-odd A scale as tan2
While in general gg→Abb (A →bb) is promising, gg→A is difficult to study when A → bb.The addition of the tau tau decay mode expand the CDF reach.
Search for MSSM A→tau tau
M.Rescigno - Riunione CSNI 16 Maggio 2005
Search for MSSM A→ MSSM
The candidates sample has significant contamination from quark and gluon jets.
Tau visible products and missing ET directions are used to separate signal from W+jets bkg
Z → is the large source of background, can only be distinguished by partial mass distribution mvis(lepton, tau, missing ET)
230 evts. obs. 263.630.1exp.
M.Rescigno - Riunione CSNI 16 Maggio 2005
Verso il 2009 – SUSY Higgs
• 1) Estrapolando l’attuale analisi D0 (4 bjet)• 2) Estrapolando l’attuale analisi CDF direct production A in • Sensitivita’ a nuova fisica significativamente estese con
maggiore luminosita’
M.Rescigno - Riunione CSNI 16 Maggio 2005
Charginos & Neutralinos
• mSUGRA– Neutralino is LSP
• Look 3 leptons + Missing Et
• GMSB– Gravitino is LSP– Neutralino (NLSP)
gravitino + • Look for + MET + X
back
M.Rescigno - Riunione CSNI 16 Maggio 2005
Tri-lepton search • New D0 limit (model
dependent): ± > 116 GeV – 3l - max ± > 128 GeV – Heavy
Squarks• Better than LEP in some
scenarios• CDF (run II) limit close to
being complete
M.Rescigno - Riunione CSNI 16 Maggio 2005
+ MET searches• Sensitive to 0
1 G– CDF limit: ±
1 > 168 GeV@ 95% CL
– D0 limit: 195 GeV– Combination: 209 GeV (New)
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