recent physics results from cdf and d0 · from cdf and d0. evelyn j. thomson, the ohio state...
TRANSCRIPT
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 1
µJet1
Jet3
Jet2
Jet4
Evelyn J. ThomsonThe Ohio State University
II Run CDF from
candidate bbqµνqtt ′→
B physicsBs and Λb propertiesBs mixing
Electroweak physicsW widthZ FB asymmetry
Top physicsTop productionTop mass
QCDInclusive jet production
Searches for new physicsExtra dimensionsSUSYLeptoquarksRare decays
Recent Physics Results from CDF and D0
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 2
Main Injector( new )
T ev atronD ØC D F
C h icag o↓↓↓↓
p s ou rce
B oos ter
Current Initial Luminosity~40x1030 cm-2s-1
Integrated Luminosity~200 pb-1 this year
Run II Goals >2000 pb-1 in 2007>4000 pb-1 in 2009
BestRun I 110pb-1
Run I→Run IIECM=1.8→1.96 TeVTbunch=3500→396 ns
Performance of Fermilab Tevatron
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 3
CDF since June 2001Delivered ~ 300 pb-1
Recorded ~ 230 pb-1
Summer 2003 prelim. results ~ 140 pb-1
Inte
gra
ted
lum
ino
sity
(p
b-1
)CDF and D0 status: Run II > Run I!
D0 since April 2002Delivered ~ 240 pb-1
Recorded ~ 180 pb-1
Summer 2003 prelim. results ~ 130 pb-1
CDF
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 4
0.0000015 Hz15 fbpp→WH→ℓνbb (if MH=120GeV)
0.0002 Hz2 pbpp→tt→WWbb→ℓνbbX
0.04 Hz0.5 nbpp→ZX→ℓℓX0.4 Hz5 nbpp→WX→ℓνX1 kHz10 µbpp→bb (b pT>6 GeV, |η|<1)
6 MHz60 mbInelastic pp
Event RateCross-sectionProcess
Assume L =100x1030 cm-2s-1, ℓ=electron or muon
…is like drinking from a fire-hose!”…is like panning for gold!”…is all about the trigger!’
Examine each pp collision (1.7 MHz)Select few interesting events (<70 Hz)
Store for further offline analysis
High pT leptonHigh ET jet, photonHigh Missing ET (MET)Displaced hadrons from bottom and charm decay
Keep 1 out of 25,000
2tanlnln5.0
θη −=
−+=
z
z
pppp
“ Physics at a hadron collider…
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 5
Detector
L1 trigger
L2 trigger
L3 trigger
tape
46 L1buffers
1.7 MHz bunchcrossing rate
30 kHz L1 accept
300 Hz L2 accept
70 Hz L3 accept
Hardware tracking for pT ≥1.5 GeV
Muon-track matching
Electron-track matching
Missing ET, sum-ET
Silicon tracking
300 CPU’s
Jet finding
Full event reconstruction
Refined electron/photon finding
>100Hz with datacompression
4 L2 buffers
Three level trigger - CDF
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 6
Heart of CDF Run II triggerL1 tracks pT>1.5GeV every 132nsEfficiency=96% σ(Φ)=5mrσ(pT)=(1.74 pT)%
L1 electron = L1 track + EM clusterL1 muon = L1 track + muon stub
L1 high pT lepton triggers for W/ZL1 low pT lepton/track triggers for B
Low pT di-muon trigger:2 L1 muons pT>1.5 GeVCollect J/Ψ’s for calibration and B physics
CDF Level 1 Track Trigger
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 7
-500 -250 0 250 500SVT impact parameter (µm)
35µm ⊕ 33 µmresol ⊕ beam⇒ σ = 48 µm
Exploit long b, c lifetimes in Trigger!L1 track + Si hits = Impact parameter @L2
A first at a hadron collider!CDF is a charm/ B Factory!
Lepton (e, µ) + displaced track triggerLepton:pT>4 GeVTrack: pT>2 GeV, d0>120 µmSemi-leptonic B decays (B→ℓνX)
Displaced two track triggerTracks: pT>2 GeV, d0>120 µmΣpT>5.5 GeVFully hadronic B decays (B→hh’, Bs→Dsπ, D→Kπ …)
Proton-antiprotoncollision point
B decay vertex
d0=Impact parameter
2D decay lengthLxy~ 1 mm
Transverse view
CDF Level 2 Silicon Vertex Trigger
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 8 [GeV/c]T p0D
5 10 15
]2
mas
s [M
eV/c
0D
1856
1858
1860
1862
1864
1866
1868
[GeV/c]T p0D5 10 15
]2
mas
s [M
eV/c
0D
1856
1858
1860
1862
1864
1866
1868 before calibration
calibrated and fit bias removed
σ 1±PDG
Essential forMass differences
Mass measurements
Use 500k J/Ψ→µ+µ-
Measure detector materialto remove pT dependenceEnergy loss correctionsCompare to PDG J/Ψ massB field calibration
Using calibration from J/Ψ, test withLow momentum (π): Ks →π+ π-
High statistics (K, π): D0→K+ π-
High momentum (µ): ϒϒϒϒ→ µ+ µ-
CDF Momentum Scale Calibration
Raw tracks
Add B scale correction
Tune missing material
Correct for material in GEANT
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 9
]2
mass [GeV/cπKK1.80 1.85 1.90 1.95 2.00 2.05
2E
ntrie
s pe
r 2
MeV
/c
0
50
100
150
200
250
300
350
400 CDF Run II, 11.6 pb-1
KK→φ, πφ→s, D+DUnbinned likelihood fit projected
Displaced two track trigger
Common final decay stateAlmost identical kinematicsMany systematics cancel
First Tevatron Run II publication(PRD accepted June 2003)
99.41 ± 0.38(stat) ± 0.21(sys) MeV/c2
Agrees with old world average99.5 ± 0.50 MeV/c2
Recent BaBar PRD 65(2002)09110498.4 ± 0.1(stat) ± 0.3(sys) MeV/c2
=− ++ )()( DmDm s
Test lattice QCD and Heavy Quark Expansion
)()()()( 00 ++ −=− DmDmBmBm sds
D Meson Mass Difference
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 10
Prompt Charm Meson Cross-section
[GeV/c]T
p5 10 15 20
[nb
/(G
eV/c
)]T
/dp
σd
102
103
104
[GeV/c]T
p5 10 15 20
[nb
/(G
eV/c
)]T
/dp
σd
102
103
104
0D
[GeV/c]T
p5 10 15 20
[nb
/(G
eV/c
)]T
/dp
σd
102
103
[GeV/c]T
p5 10 15 20
[nb
/(G
eV/c
)]T
/dp
σd
102
103
+D*
[GeV/c]T
p5 10 15 20
[nb
/(G
eV/c
)]T
/dp
σd
102
103
[GeV/c]T
p5 10 15 20
[nb
/(G
eV/c
)]T
/dp
σd
102
103
+D
[GeV/c]T
p5 10 15 20
[nb
/(G
eV/c
)]T
/dp
σd
10
102
103
[GeV/c]T
p5 10 15 20
[nb
/(G
eV/c
)]T
/dp
σd
10
102
103
+sD
]2) [GeV/c+π -m(K1.8 1.85 1.9
2
En
trie
s p
er 2
MeV
/c
0
1000
2000
3000
+π-K→0D
]2) [GeV/c+π -)-m(K+π+π -m(K0.14 0.15 0.16
2
En
trie
s p
er 0
.3 M
eV/c
0
200
400
600
800 ,+π0D→+D*+π-K→0D
]2) [GeV/c+π+π-m(K1.7 1.8 1.9 2
2
En
trie
s p
er 2
MeV
/c
0
1000
2000
+π+π-K→+D
]2) [GeV/c+π-K+m(K1.8 1.9 2 2.1
2
En
trie
s p
er 5
MeV
/c
0
100
200
,+πφ→s
+,D+D+K
-K→φ
First measurement at a hadron colliderAbove theory as for B mesons
Test NLO QCD
bGeVpD
bGeVpD
bGeVpD
bGeVpD
Ts
T
T
T
µσµσµσµσ
22.005.075.0)0.8,(
7.01.03.4)0.6,(
8.01.02.5)0.6,(
5.12.03.13)5.5,(*
0
±±=>
±±=>
±±=>
±±=>
+
+
+
Submitted to PRL (hep-ex/0307080)
(Rapidity<1)
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 11
Why should you care?Bs meson and Λb baryon unique to Tevatron now
(Not produced at BaBar or Belle)
Bs meson properties:MassLifetime∆ms frequency∆Γ sCP violationCKM angle γ
Λb baryon properties:MassLifetimeCP violationTest of HQE
B Physics
γ
α
β
(ρ,η)
(1,0)Bd→π+π-
Bs→K+K-Bd→J/ΨKs
Bs→Dsπ
CKM matrix triangle
(0,0)
W
W
u, c, t u, c, t
b
s
s
b
Vts
*
*
cb
ub
VVλ *
*
ts
td
VVλ
s
d
mm
∆∆
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 12
ct, cm-0.1 0.0 0.1 0.2 0.3
mµ
ca
nd
ida
tes
pe
r 5
0
1
10
102
103
φ ψ J/→ s BCDF Run II Preliminary -1 138 pb≈L
data
ct (Sig)
) Sct (Bkg
) Lct (Bkg
ct, cm-0.1 0.0 0.1 0.2 0.3
mµ
ca
nd
ida
tes
pe
r 5
0
1
10
102
103
Fit prob: 19.7%
ct, cm-0.1 0.0 0.1 0.2 0.3
mµ
ca
nd
ida
tes
pe
r 5
0
1
10
102
103
D0 RunII Preliminary, Luminosity=114 pb-1
0
20
40
5 5.2 5.4 5.6 5.8M(J/ψ φ) GeV/c2
Bs → J/ψ φN = 133 ± 17
2candidate mass, GeV/c5.3 5.4 5.5
2can
did
ate
s p
er
10 M
eV
/c
0
10
20
30
40
50
60
70
80φ ψ J/→ s B
CDF Run II Preliminary -1 138 pb≈L
13 sig.±120candidates
2candidate mass, GeV/c5.3 5.4 5.5
2can
did
ate
s p
er
10 M
eV
/c
0
10
20
30
40
50
60
70
80
Fit prob: 27%
Bs mass – PDG 5369.6 ± 2.4 MeV/c2
CDF 5365.5 ± 1.3(stat) ± 0.9(sys) MeV/c2
D0 5360 ± 5 MeV/c2
Bs→J/ψ Φ with J/ψ→µ+µ- and Φ→K+K-
B+→ J/ΨK+, B0 →J/ΨK*0 check technique, systematics
Mass J/ψ Φ (GeV) Mass J/ψ Φ (GeV) ct (cm)
BT
Bxy p
mLct =
Bs Meson Mass and Lifetime
Future:Search for CP violation and measure βs
Compare to lifetime from Bs→ ℓνDs and extract ∆ Γ s
Bs lifetime - PDG 1.461 ± 0.057 psCDF 1.33 ± 0.14(stat) ± 0.02(sys) psD0 1.19 ± (stat) ± 0.14(sys) ps19.0
16.0
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 13
CDF Run II Preliminary, L = 65 pb-1
5.40 5.50 5.60 5.70 5.800
10
20
30
40
50
60
ΛB Candidate Mass (GeV/c2)
Eve
nts/
10M
eV/c
2
ΛB → J/ψ Λ
46± 9 signal candidates
CDF Run II Preliminary 65pb-1
Unbinned Likelihood Fit To ΛB Lifetime
1
101
102
103
J/ψ cτ µmE
vent
s/40
µm
cτ=374±78(stat)±29(syst)µm
signal region fit
background fit
CDF Run II Preliminary 65pb-1
ΛB mass sideband
-1000 0 1000 2000
1
101
102
103
(GeV)ΛΨJ/M4.5 5 5.5 6 6.5 7
Even
ts /
50 M
eV
0
10
20
30
40DØ Run II Preliminary
14±#Sig.=5624 MeV±M=5600
20 MeV± = 85σ
Λb mass – PDG 5624 ± 9 MeV/c2
CDF 5620.4 ± 1.6(stat) ± 1.2(sys) MeV/c2
D0 in progressµ+ µ+
π−
π+
B Λ0B
K 0s
µ− µ−J/ ψ J/ ψ
Λ
p
π−
Check technique systematics
First lifetime from fully reconstructed Λb decay!
Λb→J/Ψ Λwith J/ψ →µ+µ- and Λ →pπ
Mass J/ψΛ (GeV) Mass J/ψΛ (GeV) ct (cm)
Λb mass and lifetime
Λb lifetime – PDG 1.229 ± 0.080 psCDF 1.25 ± 0.26(stat)± 0.10(sys) psD0 1.05 ± (stat) ± 0.12(sys) ps21.0
18.0
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 14)
2) (GeV/cπcΛmass (
5.0 5.5 6.0 6.5 7.0
)2E
vent
s / (
0.0
2 G
eV/c
0
10
20
30
40
50
candidatesπ cΛ → bΛ 11 ±83
Four-prong B reflections
Other B meson decays
decaysbΛOther
KcΛ → bΛ
Combinatorial background
Four-prong B reflections
Other B meson decays
decaysbΛOther
KcΛ → bΛ
Combinatorial background
CDF II Preliminary )-1
CDF Run II Preliminary (Luminosity 65 pb
(with dEdx cut)
)2
) (GeV/cπcΛmass (5 5.5 6 6.5 7
)2E
vent
s / (
0.0
2 G
eV/c
0
20
40
60
80
100
120
candidatesπ cΛ → bΛ 13 ±96
Four-prong B reflections
Other B meson decays
decaysbΛOther
KcΛ → bΛ
Combinatorial background
Four-prong B reflections
Other B meson decays
decaysbΛOther
KcΛ → bΛ
Combinatorial background
CDF II Preliminary
ww
)-1
CDF Run II Preliminary (Luminosity 65 pb
Λb→Λcπ with Λc→pKπPlagued with reflections!
Add dE/dx particle idReduce reflection by ~3Only lose ~15% signal
In Future: Particle Identification!
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 15
0.7 0.8 0.9 1 1.1 1.2
lifetime ratio
τ(b baryon)/τ(B0)
0.784±0.0340.9 - 1.0
τ(Λb)/τ(B0) 0.798±0.0520.9 - 1.0
τ(Bs)/τ(B0) 0.949±0.0380.99 - 1.01
τ(B−)/τ(B0) 1.073±0.0141.03 - 1.07
Why do we care about B lifetimes, especially Λb?Important Test of Heavy Quark Expansion
B lifetime ratios
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 16
Candidate Mass (GeV)4.6 4.8 5 5.2 5.4 5.6 5.8
even
ts (
20 M
eV/b
in)
0
5
10
15
20
25
30
35
40
April 3rd 2003 CDF Run 2 PRELIMINARY-1 4 pb±65
sD*sD
π (*)s D→sB
π ϕ →sD KK→ ϕ
11 events± Yield: 44 sD
5 MeV±Uncorr. Mean: 5361
4 MeV±Sigma: 20
Candidate Mass (GeV)4.6 4.8 5 5.2 5.4 5.6
even
ts (
10 M
eV/b
in)
0
50
100
150
200
250
300
April 3rd 2003 CDF Run 2 PRELIMINARY-1 4 pb±65
+π -(*) D→dB-π -π + K→-D
and c.c
44 events± Yield: 505 - D
0.002 GeV± Uncorr. Mean: 5.267
2 MeV± Sigma: 23
First observation!Fully reconstructed hadronic final stateTwo track trigger essentialProduction rate understoodRatio of branching ratios cancels most systematics
Golden mode for Bs mixingIn progress:
Flavour tagging (εD2)Exquisite ct resolution
)()()(0 07.011.011.041.0)()(
sysBRstatss
d
s
DBBRDBBR
ff ±±±=
→→
+−
+−
ππ
Bs→Dsπ Relative Yield
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 17
Bs mixing World Average@95% C.L. ∆ms ≥ 14.4 ps-1
At least 30 times fasterthan Bd mixing ∆md=0.502 ± 0.006 ps-1
Will need exquisite proper time resolution!
Minimise error on pTwith fully reconstructeddecays Bs→Ds π
CDF ~ 60 fs (45 fs with L00)D0 ~ 75 fs
BT
Bxy p
mLct =
Towards Bs mixing
Flavour tagging Need everything for εD2~10%ε = tag efficiencyD = tag correct (dilution)
Yield – need ~1000 eventsCDF yield ~50 events in 65 pb-1
Below expectations……but careful with your abacus!Silicon coverage much improvedTrigger with majority logicAdd more decay modes
For 2 fb-1, 5σ sensitivity up toxs = 63 (S/B = 2/1) xs= ∆msτ(Bs)xs = 53 (S/B = 1/2)
Bs →→→→ Dsππππ, Ds ππππ ππππ ππππDs →→→→ ϕπϕπϕπϕπ, K*K, ππππππππππππ
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 18
CDF II simulation
—sumBd→→→→KππππBs→→→→KKBd→π→π→π→π ππππBs→→→→K ππππ
Raw fit resultsN(B0→Kπ)= 148 ± 17N(B0→ππ)= 39 ± 14N(Bs→KK)= 90 ± 17 First observation!N(Bs→Kπ)= 3 ± 11
0550110260)()(
0
0
...KBBR
BBR
d
d ±±=→→
πππ
agrees with PDG 01.002.0
13.012.029.0 ±±
Future: CKM angle γ
B→h+h- observed at CDFAbout 280 candidates (S:N=2:1)Peak is a mix of B0,Bs → ππ, πK, KKStatistical separation with dE/dx and kinematics
Two-Body Charmless B decays
)()(
00
00
017.015.002.0 sysstat
dd
ddCP KBKB
KBKBA
±±=→+→→−→= −++−
−++−
ππππ
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 19
Use K/ππππ separation dE/dx 1.16σσσσ
Use Mππ vs (1-p1/p2)⋅q1
B0d →→→→ ππππππππ B0
d →→→→K-ππππ++++ B0d →→→→K+ππππ−−−−
B0s →→→→K+ππππ−−−− B0
s →→→→K-ππππ++++B0s →→→→KK
Disentangling Charmless B decays
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 20
Why should you care?
Standard Candles!
W/Z cross-sections
Ratio -> W width
W mass
W charge Asymmetry
Z FB Asymmetry
WW, WZ, ZZ, Wγ, Zγ
Trigger on leptonic decays
Clean low bkg event signaturesW: 1 high pT lepton + large MET
Z: 2 high pT leptons
BR~11% per mode for W → ℓ νBR~3% per mode for Z→ ℓ+ℓ-
Electroweak Physics
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 21
)2
(GeV/cTM0 20 40 60 80 100 120 140
2E
ven
ts / 3
.75 G
eV
/c
0
100
200
300
400
500
600
700dataall MC
νµ →W µµ →Z ντ →W
> 20 GeVµTP
QCD bkg substracted
DØ RunII Preliminary
µν→WνeW →
result ± stat ± sys ± lum-2.62 ± 0.07 ± 0.21 ± 0.162346τ
3.23 ± 0.13 ± 0.10 ± 0.3273522.64 ± 0.02 ± 0.12 ± 0.1621599µ2.84 ± 0.02 ± 0.13 ± 0.28273702.64 ± 0.01 ± 0.09 ± 0.1638625e
σ(W) x BR(W→ ℓν) (nb)Eventsσ(W) x BR(W→ ℓν) (nb)EventsℓD0 (e: 42pb-1; µ: 17pb-1)D0CDF (all: 72pb-1)CDF
ET>25GeV, MET>25 GeVCDF |η|<1.0, D0 |η|<1.1
pT>20GeV, MET>20 GeVCDF |η|<0.6, D0 |η|<1.6
Theory prediction 2.731 ± 0.002 nb NNLO Stirling et al., Phys Lett B531 (2002)
σ(W) x BR(W→ ℓν) )cos1(2 νν φll
−= EEMT
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 22
0.264 ± 0.007 ± 0.017 ± 0.02615850.246 ± 0.006 ± 0.012 ± 0.0151631µ0.275 ± 0.009 ± 0.009 ± 0.02811390.267 ± 0.006 ± 0.015 ± 0.0161830e
σ(Z) x BR(Z→ ℓℓ) (nb)Eventsσ(Z) x BR(Z→ ℓℓ) (nb)EventsℓD0 (e: 42pb-1; µ: 32pb-1)D0CDF (all: 72pb-1)CDF
ET>25GeVCDF |η|<1.0, D0 |η|<1.1
CDF pT>20GeV, D0 pT>15GeVCDF |η|<0.6, D0 |η|<1.8
−+→ eeZ−+→ µµZ
Theory prediction 0.252 ± 0.009 nb NNLO Stirling et al., Phys. Lett. B531 (2002)
σ(Z) x BR(Z→ ℓ+ℓ-)
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 23
(TeV)CME0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2
lep
ton
s) (
nb
)→
B(W
,Z
⋅ W
,Zσ
10-1
1
)µUA1(
UA2(e)
CDF I (e)D0 I (e)
)µCDF II (e +
)τCDF II (
)µD0 II (D0 II (e)
)νl→B(W⋅ Wσ
ll)→B(Z⋅ Zσ
Theory: R Hamberg, WL van Neerven and T Matsuura,Nucl. Phys. B359 (1991) 343 CTEQ4M PDF
W and Z cross-sections vs ECM
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 24
W, Z cross-sections systematics limitedMost of systematics cancel in ratio RIndirect measurement of W width
10.36 ± 0.16 ± 0.27Combined
10.34 ± 0.35 ± 0.49D0 e
10.69 ± 0.28 ± 0.31CDF µ9.88 ± 0.24 ± 0.44 CDF e
R
Γ(W) – PDG 2.118 ± 0.042 GeVRun II 2.181 ± 0.074 GeV
Theory
)()(
)()(
)(
)(W
WZ
Z
Zpp
WppR
Γ→Γ
→ΓΓ
→→= ν
σσ l
ll
LEP
Indirect Measurement of W Width
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 25
70 75 80 85 90 95 100 105
FB
A
-0.6
-0.4
-0.2
0
0.2
0.4
Statistical
Total
CDF Run II Preliminary
-1L=72pb∫
(GeV)eeM
MC-e+ e→* γZ/band includes
several theoreticalcalculations
70 75 80 85 90 95 100 105
FB
A
-0.6
-0.4
-0.2
0
0.2
0.4
102
FB
A
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
40 60 100 200 300 600
MC-e+ e→* γZ/band includes
several theoreticalcalculations
Statistical
Total
CDF Run II Preliminary
-1L=72pb∫
(GeV)eeM10
2
FB
A
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
100
)0(cos)0(cos)0(cos)0(cos
<+><−>=
θσθσθσθσ
dddd
AFB
High mass reach unique to TevatronProbe Z-γ* interferenceComplements direct Z’ searchResult agrees with SM
Zoom into high statsZ pole region
Electron |η|<3Forward
calorimeter crucial!
Forward-Backward Asymmetry
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 26
q, l-
q’, ν
t
p p
bW+
W-
b
q, l+
q’, ν
• Production Cross Section
• Production Kinematics
• Top Spin Polarization
• Resonance Production
• Branching Ratios
• Rare Decays
• Non-SM decay (t→H+b)
• W Helicity
• Top mass
t
Top discovered by CDF and D0 in 1995Very heavy! Top mass = 174.3 ± 5.1 GeV
Only ~30 events per experiment!!!Want more top events to study properties!!!
Run II σ 30% higher at √s=1.96 TeV
Similar mass to Tungsten
Atomic # 7435 times heavier
than b quark
Top Physics
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 27
σ = 5.8 - 7.4 pbhep-ph/0303085
Top quarks produced in pairs viastrong interaction: 85% qq, 15% gg
Top quark heavy => decays very fast!Γ(t→bW)~1.5 GeV, τtop~4x10-25s
c.f. ΛQCD~100 MeV, Λ-1~10-23sToo fast for hadronisation! No top mesons or baryons Decay products know top spin
e-e(1/81)m u -m u (1/81)t a u -t a u (1/81)e -m u (2 /81)e -t a u (2 /81)m u -t a u (2 /81)e+ j et s (12 /81)m u + j et s (12 /81)t a u + j et s (12 /81)j et s (3 6 /81)
3 characteristic event signatures from WW decay
Dilepton: BR small but pure
2 high pT leptons, high MET, ≥2 jets
Lepton+Jets: BR larger but less pure
1 high pT lepton, high MET, ≥4 jets (1 b-tag)
All-hadronic: BR largest but huge QCD bkg
≥ 6 jets (2 b-tags)
Top Quark Production & Decay
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 28
10
20
30
40
50
60
70
1 3 5 7 9 11 13 15
Top Cross Sections
5.9±1.7 pbD0⁄ combined(mt = 172 GeV/c2)
6.5-1.4
+1.7 pbCDF combined(mt = 175 GeV/c2)
4.1±2.1 pbD0⁄ L+jets(topological)
5.1±1.5 pbCDF L+jets(SVX b-tag)
9.2±4.3 pbCDF L+jets(Soft Lepton Tag)
8.3±3.6 pbD0⁄ L+jets(Soft Lepton Tag)
7.6-2.7
+3.5 pbCDF Hadronic
7.1±3.2 pbD0⁄ Hadronic
8.4-3.5
+4.5 pbCDF Dilepton
Theo
ryσ (pb)tt
-
Run 1 cross section results ~100 pb-1
∫−
=dtLA
NNtt bkgobs)(σ
Why is it interesting?Re-discover top in Run IIDoes cross-section increase?Develop selections and background estimates for othertop analyses
All measurements so farare counting experiments
Top Pair Production cross-section
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 29
5311Data
2.80 ± 0.321.54 ± 0.170.68 ± 0.090.57 ± 0.08SM expectation
2.50 ± 0.301.44 ± 0.160.59 ± 0.070.47 ± 0.05tt→ℓνℓνbb
0.30 ± 0.120.10 ± 0.040.09 ± 0.050.10 ± 0.06Background
Total ℓℓeµµµeeCDF: 72 pb-1
5302Data
4.69 ± 0.642.33 ± 0.491.16 ± 0.451.21 ± 0.52SM expectation
2.81 ± 0.301.73 ± 0.260.46 ± 0.100.63 ± 0.10tt→ℓνℓνbb
1.88 ± 0.790.60 ± 0.420.70 ± 0.440.58 ± 0.51Background
Total ℓℓeµ: 97 pb-1µµ: 90 pb-1ee: 107 pb-1D0
pbtt lumsysstat )()()( 8.05.19.52.13)( ±±±=σ CDF
pbtt lumsysstat )()(7.20.2)(
4.67.4 9.07.8)( ±±±=σ D0
CDF ℓℓS:B = 8:1
Very pure!
2 high pT leptons, high MET, ≥2 jetsTop cross-section: Dilepton
pbtt sysstat )()( 7.14.33.7)( ±±=σ CDFNew! Lepton + isolated track (126 pb-1)
D0 ℓℓS:B = 3:2
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 30
Number of jets in W+jets1 2 3 4
Nu
mb
er o
f ta
gg
ed e
ven
ts
0
20
40
60
80
100
Number of jets in W+jets1 2 3 4
Nu
mb
er o
f ta
gg
ed e
ven
ts
0
20
40
60
80
100
mistagsWbbWccnon-WWc
ττ→WW,WZ,ZSingle top
σ 1±Tot bkgd )-1Data (107.9 pb
CDF II preliminary
≥
jet multiplicity1 2 3 4
no
. of
tag
ged
eve
nts
0
10
20
30
40DataQCDW+lightWcWccWbberror on Bgr
DØ Run II Preliminary
jet multiplicity1 2 3 4
no
. of
tag
ged
eve
nts
0
10
20
30
40
jet multiplicity1 2 3 4
no
. of
tag
ged
eve
nts
0
10
20
30
40DataQCDW+lightWcWccWbberror on Bgr
DØ Run II Preliminary
jet multiplicity1 2 3 4
no
. of
tag
ged
eve
nts
0
10
20
30
40D0 CSIP D0 SVX
CDF SVX1 high pT lepton, high MET, ≥3 jets, 1 b-tagSVX: secondary vertex CDF Lxy > 3σ(Lxy) D0 Lxy > 5σ(Lxy)
CSIP: count tracks with significant d0≥2 tracks with d0 > 3σ(d0)≥3 tracks with d0 > 2σ(d0)
45-55% efficiency for 1 b-tag in tt MC
Use 1, 2 jet events to check bkg modelLook for excess in ≥3 jet region
Top cross-section: Lepton + Jets
45pb-1 45pb-1
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 31
Jet 4
Jet 1
e
Jet 2
+
Jet 3
PV
TV
SV
~2mm
~4mm
Event is b-tagged by both SVX and CSIP (run 169923 event 16396718)
4 jetsElectron pT = 27 GeV
Jet pT = 51, 36, 30, 53 GeVMissing ET = 58 GeV
HT = 207 GeVAplanarity = 0.11
Primary vertexNtrack = 17z = −−−−4.6 cm
D0 Run II Electron + Jets Candidate
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 32
pbtt
pbtt
pbtt
lumsysstat
lumsysstat
lumsysstat
)()(7.15.1)(
4.21.2
)()(1.20.2)(
9.40.4
)()(1.28.1)(
4.46.3
8.00.8)(
1.18.10)(
7.04.7)(
±±±=+
±±±=
±±±=
σ
σ
σ
KINSLT D0
SVX D0
CSIP D0
pbtt lumsysstat )()()( 2.07.03.19.3)( ±±±=σ CDF
Top cross-section: Lepton + Jets
jet multiplicity1 2 3 4
no
. of
tag
ged
eve
nts
0
10
20
30
40Data
error on Bgr
error on Bgr+Signal
DØ Run II Preliminary
jet multiplicity1 2 3 4
no
. of
tag
ged
eve
nts
0
10
20
30
40D0 SVX
D0 II preliminary 45 pb-1
Number of jets in W+jets1 2 3 4
Nu
mb
er o
f ta
gg
ed e
ven
ts
0
20
40
60
80
100BackgroundBackground errors
tBackground + t(measured cross section)
errorstBkgnd + t)-1Data (107.9 pb
CDF II preliminary
≥Number of jets in W+jets
1 2 3 4
Nu
mb
er o
f ta
gg
ed e
ven
ts
0
20
40
60
80
100
CDF II preliminary 108 pb-1
Data108 pb-1
45 pb-1
45 pb-1
90 pb-1
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 33
80.2
80.3
80.4
80.5
80.6
130 150 170 190 210
mH [GeV]114 300 1000
mt [GeV]m
W [
GeV
]
Preliminary
68% CL
∆α
LEP1, SLD Data
LEP2, pp− Data
0
2
4
6
10020 400
mH [GeV]
∆χ2
Excluded Preliminary
∆αhad =∆α(5)
0.02761±0.00036
0.02747±0.00012
Without NuTeV
theory uncertainty
Top strongly correlated with Higgs5 GeV shift in mtop => 37% shift in mH
(M. Gruenewald DESY-Zeuthen ’03)
Top mass measurement crucialto indirect prediction from SM fit! Run II goal: mtop error < 3 GeV
Why is it interesting?Over-constrains SMConfronts indirect predictionswith direct measurementsSee good agreementBoth prefer lighter Higgs
..%95@211
91 5837
LCGeVm
GeVm
H
H
<= +
−
Top mass (GeV)W
mas
s (G
eV)
Higgs mass (GeV)
68% CL
Top Quark Mass and the Standard Model
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 34
Uses one quantity per event- All events carry same weight- Fit to shapes from MC
CDF Run II Top Mass: Lepton + Jets
0.6Generators
1.0Other MC modeling
0.1b-tag
7.1 GeVTotal
0.5Bkgd shape
2.0PDF
2.6ISR/FSR
6.2Jets
Systematic (GeV/c2)
Source
1 high pT lepton, high MET, ≥3 jets, 1 b-tag4th jet ET>8 GeV (usually 15 GeV)
22 events, expect 6.5 ± 2.0 from bkg
2)()(
7.124.9 /1.75.177 cGeVm sysstattop ±±=
CDF Run II preliminary 108 pb-1
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 35
Use constrained fit technique with 2 dofMlυ=MW, Mjj=MW, Mt1=Mt2, pT balance
4 jets = 12 possible jet-parton combinationsx 2 solutions for neutrino pz
!!!Use b-tagging to reduce permutations!!!
Choose combination with lowest χ2
l
ν
W+
W-
t
t
b-jet
b-jet
jet
jet
X Constraints
Reconstructed event-by-event top mass
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 36
MC signal MC bkg
)log( bkgP
)/( bkgtttt PPPD +=
Uses event probabilities- Full set of event observables- Better measured events carry more weight
Reduces background91 original candidates77 after exactly 4 jets22 after Pbkg<-11
Mtop=180.1 ± 3.6 ± 4.0 GeV
Old stat error was 5.6 GeV!Like 2.4 increase in statistics!
Improved D0 Run I Top Mass
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 37
Top Mass – Expected Statistical Errors
D0 Run I (125 pb-1)Preliminary
Expected 5.4 GeVObserved 3.6 GeV
CDF Run II (108 pb-1)Preliminary
Expected 8.8 GeVObserved +12.7, -9.4 GeV
Expected stat. error (GeV)
Expected stat. error (GeV)
Data-ve
Data+ve
Data
Observed errorsconsistent with expectations
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 38
Systematics dominated by Jet Energy Scale…to be reduced
Theoretical error dominated by PDF’s (gluon at high-x)
Agreement within uncertainties
Why should you care? Mother of all backgrounds!Jet cross-section – sensitive to gluon distribution in proton
Better predictions of many new physics processes at high energies
Highest ET jets ever! 8 orders of magnitude!
QCD - Inclusive Jet Production
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 39
[GeV]JJM200 400 600 800 1000 1200 1400
(dat
a -
theo
ry)/
theo
ry-1
-0.5
0
0.5
1
1.5
2
NLO QCD(JETRAD)
MRST2001
maxT = 0.5 ERµ = Fµ = 1.3, sepR
DØ Run II preliminary
[GeV]JJM200 400 600 800 1000 1200 1400
(dat
a -
theo
ry)/
theo
ry
-1
-0.5
0
0.5
1
1.5
2
NLO QCD(JETRAD)
CTEQ6
maxT = 0.5 ERµ = Fµ = 1.3, sepR
DØ Run II preliminary
[GeV]JJM200 400 600 800 1000 1200 1400
[nb/
GeV
]⟩
JJ/d
Mσ
d⟨
10-8
10-7
10-6
10-5
10-4
10-3
10-2
10-1 | < 0.5jetηcone R=0.7, |
-1 RunII, L=34 pb
=1.3sep NLO CTEQ6, RmaxT = 0.5 ERµ = Fµ
DØ Run II preliminary
Cross-section well reproduced by NLO theory over 6 orders of magnitude
Systematics dominated by Jet Energy Scale
QCD – Dijet cross-section
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 40
Why? Standard Model is incomplete!
Why MEW << MPl?How to achieve grand unification?
How to include gravity?What explains proliferation of quarks and leptons?
What determines their mixings?
More general theories make predictions that can be tested at the Tevatron
Searches for New Physics
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 41
Tevatron is the world’s highest energy accelerator and is the mostlikely place to directly discover a new particle or force
Search for Extra Dimensions, Z’Study of high ET tails
Search for SUSYJets + METPhotons + METTrileptons
Search for LeptoquarksFirst generation eejjSecond generation µµjjAll generations ν ν jj
Search for Rare DecaysD0→µ+µ-Bs→µ+µ-
What is dark matter?SUSY LSP?
Extra dimensions?Tevatron can put limits on
models
0009.00224.0
135.02
008.0009.0
2
±=Ω
=Ω +−
h
h
B
M
WMAP, astro-p h / 0 3 0 2 2 0 7
Searches for New Physics
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 42
ADD Model (Arkani-Hamed, Dimopoulos, Dvali)
n “ large” extra dimensions of size
n=1 R~108 km – excluded!n=2 R~1 mm ~ tabletop realmn≥3 R≤3 nm - collider realm
Randall-Sundrum ModelOne “ small” extra dimensionwarped by factor Spin-2 resonanceGraviton massCoupling k/MPl
πckre 2−
SM particles confined to 4 dimensions Gravity propagates in extra dimensions
Solves the hierarchy problem!Can explain dark matter!
nsPl
s
MMM
R /2)/(1
~
Experimental signaturesVirtual graviton exchange modifiesfermion/boson pair production
Direct graviton emissionJets + METPhoton + MET
g, qg, q γ
G
Extra Dimensions Overview
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 43
0.85--CDF diEM
0.791.05, 0.88, 0.700.88D0 µµ1.42, 1.52, 1.01
HLZ
n=2, 3, 7
1.141.28D0 diEM
Hewett
λ=+1
GRW95% C.L.
MS (TeV)
ee and γγ: 2 EM objects pT>25 GeV
)|*θ|Cos(0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
Eve
nts
/0.1
2
0
100
200
300
400
500DØ Run II Preliminary
)|*θ|cos(
Invar. Mass(GeV)µDi0 100 200 300 400 500 600 700 800
Eve
nts
/24.
0 G
eV
10-2
10-1
1
10
102
103
Invariant Mass
~100 pb-1
|cosθ*| Mµµ (GeV)
µ+µ-: pT>15 GeV, mµµ> 40 GeV
Consistent with no signalD0 now has world’s best limit!Probe up to 2 TeV with 2 fb-1diEM Mass, GeV
0 200 400 600
*
θ
cos
00.20.40.60.81
Eve
nts
10-2
10-1
11010
210
3
SM Prediction DØ Run
diEM Mass, GeV
0 200 400 600
*
θ
cos0
0.20.40.60.81
Eve
nts
10-2
10-1
11010
210
3
DataII Preliminary
diEM Mass, GeV
0 200 400 600
*
θ
cos
00.20.40.60.81
Eve
nts
10-2
10-1
11010
210
3
ED Signal
diEM Mass, GeV
0 200 400 600
*
θ
cos
00.20.40.60.81
Eve
nts
10-2
10-1
11010
210
3
QCD Background
~120 pb-1
D0 Run II Preliminary
Virtual graviton exchangeLook for excess at
high dilepton or diphoton mass
Extra Dimensions – ADD Model
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 44
Spin-2 gravitonLook for resonances in
dilepton massConsistent with no signal
Extra Dimensions - Randall-Sundrum Model
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 45
Mee (GeV)100 200 300 400 500 600 700 800
1
10
102
103
DØ Run II Preliminary
Z’ (600 GeV) x10
D a t aD r el l Y a nQ C D
DØ Run II Preliminary
Di-e l e c t r o n I n v a r ia n t M a s s
Predicted by many models Look for resonance in dilepton mass
Consistent with no signal
~50pb-1
D0 m(Z′)> 719 GeV @ 95% C.L ~100pb-1
World’s best limit
Probe up to 1 TeV with 2 fb-1
CDF m(Z′)> 665 GeV @ 95% C.LClose to Run I 690 GeV
Extra Gauge Bosons
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 46
Sensitive to a variety of new physicsProbes highest energiesAxigluon mass > 1.1 TeV@95%C.L.
Dijet Resonances
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 47
Scalar Leptoquark Mass [GeV]200 210 220 230 240 250 260 270 280
Cro
ss S
ecti
on
* B
R [
pb
]
10-1
DØ Run 2 Preliminary>231GeVLQD0 Run2, M
>253GeVLQD0 Run2 and D0 Run1, M>262GeVLQD0 Run2 and D0+CDF Run1, M
NLO Theory
) [GeV]T(EjjµµΣ = TS
0 100 200 300 400 500 600
En
trie
s / 3
0 G
eV
0
1
2
3 Data
SM Background
) = 200 GeV2M(LQ
Run II Preliminary∅D
~100pb-1
First generation LQ1 LQ1→eejj Second generation LQ2 LQ2→µ µ jj
All three generations LQ LQ→ν ν jjJets + MET
CDF M(LQ)>107 GeV @95%C.L.
D0 M(LQ1)>253 GeV @ 95% C.L.CDF M(LQ1)>230GeV @ 95% C.L.
D0 M(LQ2)>186 GeV @ 95% C.L.CDF in progress
Directly couple quarks to leptonsPredicted by Grand Unified Theories
Scalar Leptoquarks
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 48
Long-lived massive charged particles?Move slowly Measure time-of-flight!∆TOF=TOF candidate – TOF at c
Consistent with no signalm(stop)> 107 GeV @95% C.L.
LEP limit is 95 GeV
SelectionTracks with pT>40 GeV
∆TOF>2.5 nsObserve 7 events in 53pb-1
Expect 2.9 ± 0.7(stat) ± 3.1(syst)
SUSY – Search for Long-lived Stop
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 49
Gluino pair production cross-section largeVery distinctive signature of 4 b jets + MET
)~)(~()~
)(~
(~~ 01
0111 χχ bbbbbbbbgg →→
Selection3 or more jetsMET> 50 GeVLepton veto
4.4 ± 0.90.5 ± 0.11Double
10.6 ± 1.75.6 ± 1.44Single
Expected
Signal
Expected
Background
Datab-tag
GeVmg 220~ =GeVm 600
1~ =χ
GeVmb
1601
~ =
Assume
SUSY – Sbottoms from Gluino Decays
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 50
“Golden” channel with low backgrounds butLeptons are soft (pT<20 GeV)tanβ>8 most leptons are taus!Need >300pb-1 to improve on LEP
hminv3dataEntries 988Mean 44.83RMS 24.74
invariant (e,e) mass0 20 40 60 80 100 120
0
10
20
30
40
50
60
70
hminv3dataEntries 988Mean 44.83RMS 24.74
hminv3dataEntries 988Mean 44.83RMS 24.74
dataZ -> eeZ -> tautauY -> eeW incl.QCD
DØ Run II Preliminary
Understanding soft electrons!Two electrons pT>10 GeV
At least one electron pT<20 GeV
Understanding taus!
CDF has tau (pT>5 GeV)
and di-tautriggers
SUSY Trileptons
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 51
[TeV]Λ35 40 45 50 55 60
10-1
1
10
[GeV]10χm50 60 70
[pb]σ Run II Preliminary∅D
0 20 40 60 80 100 120 140 160 180 200
1
10
102
γγ
QCD
MET (G e V )
D0 Run 2 preliminary~ 50 pb-1
Gaugino pair production and LSP = gravitino NLSP= neutralinoExperimental signature γγ+METClose to Run I limits
XGG
ZWgauginospp
++→
→+→→~~
~~,, 01
01
γγ
χχγ
Search for Gauge Mediated SUSY
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 52
Search for FCNC Bs→µ+µ-
CDF 1 candidate in Bs and Bd windowBR(Bsµµµµµµµµ) < 9.5E-7 @ 90% CL
< 1.2E-6 @ 95% CLBR(Bdµµµµµµµµ) < 2.5E-7 @ 90% CL
< 3.1E-7 @ 95% CL
SM BR(Bs→µ+µ-)~ 3.8x10-9
Various SUSY models predictenhancement by 10 to 1000
Recently interesting sincesame SUSY models predict deviations of (g-2)µ
Exp: PRL 89 (2002) 101804,129903Theory: PRL 87 (2001) 251804
Rare Decays
D0 3 candidates in Bs windowBR(Bsµµµµµµµµ) < 1.6E-6 @ 90% CL
World’s best limits for BsMay catch up to BaBar/Belle for Bd
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 53
Mass [GeV]-µ+µ4.5 5 5.5 6 6.5 7
Eve
nts
/10
MeV
0
0.5
1
1.5
2
2.5
3
3.5
4
SignalRegion
No. Candidates: 3Expected bkg: 3.4
D0 RunII Preliminary
CDF1 event in Bs and Bd search window
Expected bkg0.54 ±±±±0.20 (for Bs) 0.59 ±±±±0.22 (for Bd)
Rare Decays
D03 events in Bs
search window
Expected bkg3.42 ±±±±0.79 (for Bs)
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 54
Search for the SM Higgs Boson
In 50% of experiments
20th century CDF/D0 sensitivity study still valid21st century CDF/D0 search will need:Sophisticated techniques to improve sensitivityExcellent understanding of backgrounds and systematicsEnough data!
5σ discovery3σ evidence95% CL exclusion
80 100 120 140 160 180 200
1
10
100
mH (GeV)
inte
gra
ted
lu
min
osit
y (
fb-1
/exp
.)
SUSY/Higgs Workshop
('98-'99)Higgs Sensitivity
Study ('03)
statistical power only
(no systematics)
PRELIMINARY
LEP mH>114.4 GeV @95% CL
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 55
First physics measurements well underwayDisplaced track trigger for B physics
Bs meson and Λb baryonW and Z bosons
Top quarkSearches for new physics
In next few yearsBs mixing
Top quark mass error < 3 GeVWorld’s best limits for searches…
…or discovery of new physics!
CDF and D0 are back!Conclusions
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 56
7-8 silicon layers1.6<r<28 cm, |z|<45 cm|η| ≤ 2.0, cosθ=0.964σ(hit) ~ 14 µm
Time-of-flight100 ps@150cmp, K, π id
96 layer drift chamber |η|≤ 1.044<r<132 cm, 30k channelsσ(hit) ~ 150 mmdE/dx for p, K, π id
Tile/fiber endcapcalorimeter 1.1<|η|<3.5
µ coverage to|ηηηη|≤1.580% in phi
132 ns front endCOT tracks @L1SVX tracks @L230000/300/70 Hz~no dead time
Some resolutions:pT ~ (0.7 ⊕ 0.1 pT)%J/Ψ mass ~15 MeVEM E ~ 16%/√EHad E ~ 100%/√Ed0 ~ 6+22/pT µmPrimary vtx ~10 µmSecondary vtxr-Φ ~ 14 µmr-z ~ 50 µm
1.4 T magnetic fieldLever arm 132 cm
CDF Detector Upgrades
SLAC Summer Institute August 7 2003 p. Evelyn J. Thomson, The Ohio State University 57
2.0 T magnetic fieldLever arm 52 cm
4 silicon layers+disksSuited to limited space2.8<r<10 cm|η| ≤ 3.0, cosθ=0.993
Now! Sci-Fi tracks@L1Next! Silicon tracks@L2
5000/1000/50 Hz
8 layer Sci-Fi tracker |η|≤ 1.710<r<52 cm, 80k channelsVLPC’s at 9K, 85% QEσ(hit) ~ 100 µm
Pre-showerParticle idEnergy
Some resolutions:pT ~ (2.0 ⊕ 0.2 pT)%J/Ψ mass ~27 MeVEM E ~ 15%/√EHad E ~ 80%/√Ed0 ~ 13+50/pT µmPrimary vtx ~15 µmSecondary vtxr-Φ ~ 40 µmr-z ~ 80 µm
µ coverage to|η|≤2.090% in phi
D0 Detector Upgrades
%d0%bb%d0%b8%d1%81%d1%82%d0%be%d0%b2%d0%ba%d0%b0 %d0%bf%d0%be %d1%81%d0%b8%d1%81%d1%82%d0%b5%d0%bc%d
%d0%9f%d1%80%d0%b5%d0%b7%d0%b5%d0%bd%d1%82%d0%b0%d1%86%d1%96%d1%8f %d0%92%d1%96%d0%b9%d0%bd%d0%b0 %d
%d0%b1%d1%80%d0%be%d1%88%d1%8e%d1%80%d0%b0 %d0%bf%d0%be %d0%b3%d0%b5%d0%be%d1%82%d0%b5%d1%80%d0%bc%d
%d0%bc%d0%be%d0%bd%d1%82%d0%b0%d0%b6 %d0%b2%d0%bd%d1%83%d1%82%d1%80%d0%b5%d0%bd%d0%bd%d0%b8%d1%85 %d
%d1%80%d0%b5%d1%88%d0%b5%d0%bd%d0%b8%d1%8f %d0%b4%d0%bb%d1%8f %d0%ba%d0%be%d1%82%d1%82%d0%b5%d0%b4%d
%d1%80%d1%83%d0%ba%d0%be%d0%b2%d0%be%d0%b4%d1%81%d1%82%d0%b2%d0%be %d0%bf%d0%be %d0%bf%d1%80%d0%be%d
%d0%9c%d0%b0%d0%b3 %d0%95%d0%ba%d0%b1 %d0%91%d1%96%d0%be%d1%82%d0%b5%d1%85%d0%bd%d0%be%d0%bb%d0%be%d
%d0%90%d0%b2%d1%82%d0%be%d1%80%d0%b5%d1%84%d0%b5%d1%80%d0%b0%d1%82%20%d0%95 %d0%90 %20%d0%a1%d0%b0%d
%d1%80%d1%83%d0%ba%d0%be%d0%b2%d0%be%d0%b4%d1%81%d1%82%d0%b2%d0%be %d0%bf%d0%be %d0%bc%d0%be%d0%bd%d
%d0%9a%d0%be%d0%bd%d1%81%d0%bf%d0%b5%d0%ba%d1%82 %d0%bb%d0%b5%d0%ba%d1%86%d1%96%d0%b9 %d0%b5%d0%ba%d
%d0%9a%d0%be%d0%bd%d1%86%d0%b5%d0%bf%d1%86%d1%96%d1%8f %d1%81%d1%82%d0%b0%d0%bb%d0%be%d0%b3%d0%be %d