New Physics Searches at the Tevatron · The Classic Searches e+e-: Probe Z’, RS Graviton… 0 100...
Transcript of New Physics Searches at the Tevatron · The Classic Searches e+e-: Probe Z’, RS Graviton… 0 100...
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New Physics New Physics SearchesSearches at the at the TevatronTevatronAmitabh Lath
Rutgers University/CDFFor the CDF and D0 Collaborations
ICHEP 2004Beijing
CDF D0
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TevatronTevatron:: The Energy FrontierThe Energy Frontier1.96 TeV CM Energy
500 pb-1 to tape NOW4 fb-1 to tape by FY 2009.
(8 fb-1 possible?)
• When will new physics show up?• What will it look like? • Will our triggers and analyses be sensitive to it?
We need to think beyond established theories
Main Injector& Recycler
Tevatron
Chicago!↓
⎯p source
Booster
⎯p
p
p ⎯p1.96 TeV
CDFDØ
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New Physics:New Physics: Beyond Higgs, SUSYBeyond Higgs, SUSY
Use familiar objects: e, µ, τ, γ, jet, ET
Massive Objects:Z’/W’, Gravitons (leptons, photons)
Leptoquarks (leptons, ET , jets)
Extra dimensions (leptons, jets, ET)
Compositeness:Excited Fermions (leptons, photons)
Technicolor (leptons)
Truly Exotic ObjectsCharged Massive Particles (CHAMPS)Magnetic Monopoles
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The Classic SearchesThe Classic Searchese+e-: Probe Z’, RS Graviton…
0 100 200 300 400 500 600 700 800 900-410
-310
-210
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/ ndf 2χ 62.63 / 53Prob 0.1716p0 0.71± 24.03 p1 0.00005± 0.01187
/ ndf 2χ 62.63 / 53Prob 0.1716p0 0.71± 24.03 p1 0.00005± 0.01187
0 100 200 300 400 500 600 700 800 900-410
-310
-210
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/ ndf 2χ 62.63 / 53Prob 0.1716p0 0.71± 24.03 p1 0.00005± 0.01187
DØ Run II PreliminarydiEM Mass Spectrum
)2
Dielectron Mass (GeV/c
100 200 300 400 500
)2E
vent
s / 5
(G
eV/c
10-1
1
10
102
103
104
Data
Drell - Yan
QCD Background, WW, WZ, ttττ
)2
Dielectron Mass (GeV/c
100 200 300 400 500
)2E
vent
s / 5
(G
eV/c
10-1
1
10
102
103
104
)-1
CDF Run II Preliminary (200 pb
Hypothetical Z’
Note: agreement over 2 ordersof magnitude in mee.
Large Extra dimensions
D0 Run II 200 pb-1
D0
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The Classic SearchesThe Classic Searches continuedcontinuedµ+µ− : Probe Z’, RS Graviton…
100 pb-1
Dimuon Invariant Mass (GeV)0 200 400 600 800
Eve
nts
/ 24
GeV-210
-110
1
10
210
310
410
DØ Run II Preliminary
DataSM Monte Carlo
D0
D0 250 pb-1
)2
Dimuon Mass (GeV/c100 200 300 400 500 600 700 800
2E
ven
ts /
5 G
eV/c
10-2
10-1
1
10
102
103
DataAll
µµDY Z->QCD+cosmics
t, WW, WZ, tττDY Z->
)-1
CDF RUN II Preliminary (200 pb
e uses EM calorimeter, resolution better at harder e.µ uses tracker, resolution better at softer µ.
e,µ complimentary:
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Typical High Mass events. Typical High Mass events. CLEAN!CLEAN!
eta
-4.7 -3
-2 -1
0 1
2 3
4.7
phi180
0
360
ET(GeV)
185
Bins: 400Mean: 1.03Rms: 11.2Min: 0.00516Max: 183
mE_t: 15.7phi_t: 351 deg
Run 175826 Event 15382214 Wed Jan 28 19:15:22 2004
CDFD0
Historically ee, (µµ) searches have paid off handsomely at hadron machines.
Insensitive to QCD remnants.
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DileptonDilepton CrossCross--Section Limits: Section Limits: eeee
Mass (GeV)200 300 400 500 600 700 800
) (pb
)γγ
ee
&
→ x
BR
(G
σ10
-4
10-3
10-2
10-1
1
10
102
95% CL upper bound = 0.01Plk / M = 0.02Plk / M = 0.05Plk / M = 0.10Plk / M
DØ Run II Preliminary
)2
Z’ mass (GeV/c
200 400 600 800
ee)
(pb)
→Br
(Z’
⋅σ
10-3
10-2
10-1
1
10
102
)I570 GeV (Z
)χ610 GeV (Z
625 GeV)ψ (Z
650 GeV )η (Z
750 GeV(Z’ SM coupling)
ll) limit (95% C.L.)→Br(Z’⋅σ1.3× ll) LO→Br(Z’⋅σ
)-1
CDF Run II Preliminary (200 pb
)2
Z’ mass (GeV/c
200 400 600 800
ee)
(pb)
→Br
(Z’
⋅σ
10-3
10-2
10-1
1
10
102
D0:Z’ ee Limit 780 GeV/c2
CDF :Z’ ee Limit 750 GeV/c2
D0 200 pb-1
LIMIT
S
~50 fb
D0
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DileptonDilepton CrossCross--Section Limits:Section Limits: µµµµ
)2
Mass (GeV/ cHZ350 400 450 500 550 600 650 700 750 800
ll)
(pb
)→
H.B
R(Z
σ
10-4
10-3
10-2
10-1
1
10
102
)2
Mass (GeV/ cHZ350 400 450 500 550 600 650 700 750 800
ll)
(pb
)→
H.B
R(Z
σ
10-4
10-3
10-2
10-1
1
10
102 ll) limit (95% C.L.)→.BR(Z'σ
1.3)× ll) (LO→H.BR(Zσ
)-1
CDF Run II Preliminary (200 pb
= 0.5θcot
= 0.7θcot
= 1.0θcot
CDF :Z’ µµ Little Higgs(cotθ=0.7) 720 GeV/c2
D0 250 pb-1
D0 :Z’ µµ (SM) > 680 GeV/c2LIM
ITS
~60 fb
Dimuon Invariant Mass (GeV)200 300 400 500 600 700 800 900
) (p
b)
µµ →
BR
(Z’
× σ
-210
-110
1
10
1.3)×SM Like Z’ Theoretical (LO Errors on Theoretical Cross Sectionσ 1 ±
95% CL Experimental Limits
DØ Run II Preliminary
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Technicolor:Technicolor:
)2
mass (GeV/cTω,Tρ200 300 400 500 600
ee)
(pb
)→
Br(
Z’
⋅σ
10-3
10-2
10-1
1
10 ee) limit (95% C.L.)→Br(Z’⋅σ
1.3× ee) LO→Tω,TρBr(⋅σ
)-1
CDF Run II Preliminary (200 pb
Tω=MTρM
- 100 GeVTρ=M
TπM
= 400 GeVTM
= 300 GeVTM
= 200 GeVTM
)2
mass (GeV/cTω,Tρ200 300 400 500 600
ee)
(pb
)→
Br(
Z’
⋅σ
10-3
10-2
10-1
1
10
)2
Mass (GeV/ cTρ, Tω200 250 300 350 400 450 500 550 600
) (p
b)
µµ →
.BR
(Z'
σ
10-4
10-3
10-2
10-1
1
10
)2
Mass (GeV/ cTρ, Tω200 250 300 350 400 450 500 550 600
) (p
b)
µµ →
.BR
(Z'
σ
10-4
10-3
10-2
10-1
1
10 ) limit (95% C.L.)µµ →.BR(Z'σ1.3)×) (LOµµ →Tρ, Tω.BR(σ
)-1
CDF Run II Preliminary (200 pb
=400 GeVTM
=300 GeVTM
=200 GeVTM
Almost there! Need another order of magnitude
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Another promising channelAnother promising channel: : DiphotonDiphotonEvent : 2045232 Run : 165271
Diphoton Mass = 405 GeVPhoton Et = 172, 175 GeV
γ an e without a track.
LIMITS
~70 fb
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Combined LimitsCombined Limits: : Graviton, LEDGraviton, LED
•Pairs of hard, isolated leptons and photons are powerful tools to hunt new physics.
•The SM backgroundsare small and well understood.
•The results are σ*BR, which can be interpreted in a variety of ways by different models (some of which haven’t been published yet!)
η = F/Ms4
D0 Extra dimensions
η limit:0.24 TeV-1
MPL>1.43 TeV (GRW) World’s best limit on MPL Mass (GeV)200 300 400 500 600 700 800
Pl
k / M
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0.1
Mass (GeV)200 300 400 500 600 700 800
Pl
k / M
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0.1
Randall-Sundrum gravitons
95% CL excluded domain
decay modesγγee &
DØ Run II PreliminaryD0
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Adding Adding EETT : : WW’’ SearchSearch
Electron + ETNeutrinos show up as MET
Many sources of ET tails:MuonsCracks in detectorEnergy calib.
Plot shows we have good understanding of ET.)2 (GeV/cTM
0 100 200 300 400 500 600
2E
vent
s pe
r 4
GeV
/c
-210
-110
1
10
210
310
410data
sum of backgrounds
ν e →w
hadronic jets
other backgrounds
)-1
CDF Run II Preliminary (204 pb
W’ limit plotwork in progress.
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e+e+γγ: Compositeness : Compositeness (Excited electrons)(Excited electrons)
q
q e*
e
γ
e
q
q
Z
e*
e
γ
e
contact
Gauge mediated
Electron + γ
3 events seen
meγ
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Limits on excited electronsLimits on excited electrons
GaugeLIM
ITS
~70 fb
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Electrons+JetsElectrons+Jets: : LeptoquarksLeptoquarks
Mass (GeV)0 50 100 150 200 250 300 350 400 450 500
Nev
ents
/5G
eV
10-1
1
10
102 DØ Run II Preliminary
DataTotal BkgZ/DY Bkg
QCD Bkg
(GeV)TS0 100 200 300 400 500 600 700
Neve
nts/
25G
eV
1
10
Data
DØ Run II Preliminary
Total BkgZ/DY BkgQCD BkgTop Bkg
LQ (240GeV)
Two energetic electrons.Two jets 1st gen. LQ
Scalar Energy sum, eejj
D0
D0
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Electrons+JetsElectrons+Jets: : LeptoquarksLeptoquarks
β =1 •Limit ~ 100 fb•More challenging at lower mass.
• QCD bg requires hard cuts that affect limit at low mass.
• Jets harder to study than e, γ• Jet multiplicity hard to simulate.• Jet quark, g correspondence hard to disentangle• Jet energy resolution not nearly that of e, γ.
Two energetic electrons.Two jets
Scalar Leptoquark Mass (GeV)180 200 220 240 260 280
BR
(pb)
×C
ross
Sec
tion
10-2
10-1
1
DØ Run II Preliminary
> 238 GeVLQ
DØ Run II, M
NLO Theory
238 GeV/c2
D0
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Electron+Jets+EElectron+Jets+ETT: : LeptoquarksLeptoquarks
•One energetic electron.• ET
• Two jetsβ is BR(LQ eq) =0.5
197 GeV/c2
Limit
~ 100 fb
D0
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Jets + EJets + ETT: : LeptoquarkLeptoquark
(GeV)TMissing E50 100 150 200 250 300
Eve
nts
/ 10
GeV
0
10
20
30
40
50
Data
QCD prediction
predictiont+ SM EWK / t
)2
LQ (m = 125 GeV / c
CDF Run II Preliminary
-1 L dt = 191 pb∫
(GeV)TMissing E50 100 150 200 250 300
Eve
nts
/ 10
GeV
0
10
20
30
40
50
)2
Leptoquark Mass (GeV/c80 100 120 140
(pb)
2 )β x
(1-
σ10
102
CDF Upper Limit, 95% CL
Theoretical cross section (PRL 79, 1997)
CTEQ5M, Q=m(LQ)
CTEQ5M, Q=0.5m(LQ), 2m(LQ)
)-1CDF Run II Preliminary (191 pb
278 - 117 GeV/cNo electrons in final stateLeptoquark goes to ν, jet.
Challenging at low mass.
Important for squark/gluino searches
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LeptoquarksLeptoquarks (1(1stst Gen. Limits)Gen. Limits)
Scalar Leptoquark Mass (GeV)140 160 180 200 220 240
eq
)→
= B
ran
chin
g R
atio
(L
Q
β
0
0.2
0.4
0.6
0.8
1DØ Run II Preliminary
DØ Run II
Combin
ed L
imit
ee + 2 jets
+ 2 jetsνe
D0 200 pb-1D0
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Now with Now with µµ:: LQ 2LQ 2ndnd GenerationGeneration
)2
Leptoquark Mass (GeV/c160 180 200 220 240 260 280 300 320
(p
b)
2β ×
σ
10-2
10-1
1
)-1
CDF Run II Preliminary (198 pb
Theoretical Cross Sections, Phys Rev Lett 79, 341, ’97
LQCTEQ4M, Q = M
LQCTEQ4M, Q = 0.5, 2 M
CDF upper limit, 95% CL
2 events observed
GenerationndSearch for 2
= 1βScalar Leptoquarks,
2 > 241 GeV/cLQM
) [GeV]2(jT) + E1(jTE0 50 100 150 200 250 300 350 400 450 500
) [G
eV]
2µ(T
) +
P1µ(
TP
0
50
100
150
200
250
300
350
400
450
500-1Int. Lum = 2.5 fb
LQ m=220 MC
DY,Top MC
Kinematic sig/bkg discrimination
Two muons,Two jets.
Limit
~ 70 fb
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Jets+METJets+MET:Large:Large Extra DimensionsExtra Dimensions
missing ET0 50 100 150 200 250 300 350 400 450 500
Eve
nts
/ 10
1
10
102
103
104
DØ Run II Preliminary
DataMCSignal
second jet pT0 50 100 150 200 250 300 350 400 450 500
Eve
nts
/ 10
0
10
20
30
40
50
60
70DØ Run II Preliminary
DataMCSignal
Nd4 5 6 7
Md
(G
eV)
500
600
700
800
900
1000 DØ prelim.DØ Run ICDF Run IL3
No k factor
Most stringent
Number of Dimensions
Need to understand calorimetry, tracking, acceptance in excruciating detail.
QC
D
D0
D0
D0D0
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A special sort of jetA special sort of jet: : ττ hadronshadronssignalisolationseed track
not associatedwith tau candidate
θsig
isoθ
Track Multiplicity0 1 2 3 4 5 6 7
Eve
nts
0
20
40
60
ττ→ZOther Backgrounds
Control Sample, Tau Signatureττ-1CDF Run 2 Preliminary 195 pb
See Weiming Yao’s talk for more on taus
100 200 300 400 500 600
1
10
CDF Run 2 195 pb-1
PreliminaryZ'→ττ
95% CLupper limit
mZ' (GeV)
σ•B
(Z'→
ττ)
(p
b)
sequential Z'cross section
LIMITS
~1000 fb
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Truly Exotic:Truly Exotic: CHAMPSCHAMPSCHAMPS are slow moving
Large Ionization lossLong time of flight
Highly penetratingWill look like a muon
Entries 6266
Mean -0.02381
RMS 0.3529
(ns) TOF∆-5 -4 -3 -2 -1 0 1 2 3 4 5
Num
ber o
f tra
cks
/ 0.1
ns
1
10
102
103
Entries 6266
Mean -0.02381
RMS 0.3529
Pt > 40 GeV/c
CDF Run 2 Preliminary
-1 = 53 pbL dt ∫
misolated-stop > 108 GeV/c2
LIMITS
~10,000 fb
CHA
MP
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Truly Exotic: Truly Exotic: MonopoleMonopole
B=1.4 T
COT
Solenoid
TOF
Beam
z
TOF
COT
Monopole
Segment
•Bends in the wrong plane ( high pt)•Large ionization in scint (>500 Mips!)•Large dE/dx in drift chamber
Monopole Mass [GeV]200 400 600 800
Cro
ss S
ectio
n [p
b]
10-3
10-2
10-1
1
10
102
103
Drell Yan cross section
sensitivity
CDF Run II Preliminary
95% CL Limit
mmonopole > 350 GeV/c2
LIMIT
S
~300 fb
TOF t
rigger d
esigne
d
specif
ically fo
r mono
pole
search
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SummarySummaryTevatron luminosity is ramping up.
4 fb-1 promised by 2009. Exciting physics possible.Translating detector understanding to physics.
Objects like e, µ, γ, τ, ET, jets, (b) are now reconstructed w/ excellent efficiency, purity. We use these to search for V’, Technicolor, LQ, excited fermions, extra dim...Going to get even better: More luminosity, better understanding.Now, limits ~50 - 100 fb (leptons, photons). Soon, ~10 fb!
We think outside the box.Hunt for new objects like CHAMPS, monopoles…Could use help from theorists here.
We hope to see new physics soon.We are sick and tired of making exclusion plots!
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Backup slides
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TevatronTevatron Promises High LuminosityPromises High Luminosity……
Aug04: ~0.7fb-1
delivered: > design
12 pb-1 / week currently: above “design”
Start of Fiscal YearOct 03
4 fb-1 line : 2009? Earlier?
Slam dunk!
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But can they deliver?But can they deliver?
Run 1
Last 30weeks
Recent news is encouraging!