Precision Measurements, Small Crosssections, and NonStandard Signatures: Reaching the 1 fb1 Threshol

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Precision Measurements, Small Cross-sections,
and Non-Standard SignaturesReaching the 1 fb-1
Threshold at the Tevatron

• Henry Frisch
• University of Chicago

Looking for SUSY at the Tevatron Data
Electron
CDF Event
2 electrons and a photon Ht350 GeV
Photon
11/26/06
Electron-
Typical leptonphotonX event (?) No Met-
sorry.
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Gordy as Pioneer
Have We Already Found Ourselves a Bearino In
These Woods? hep-ph/0701999
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OUTLINE

• Luminosity and Reach of the Tevatron and of
  Gordy
• The Triangle of Mtop, MW, and MHiggs
• New Precision Measurement of MW
• Precision Measurement of Mtop
• Brief Summary of Higgs Results/Projections/Opportu
  nities
• Anomalous Top Production?
• Anomalous Top Decay?
• B -gtmm-, Bs mixing, other Precision tests
• SUSY? Metjets
• SUSY?- stop and H
• Photon Signatures (lgX and ggX) and GMSB
• Lepton Signatures Same-sign dileptons and
  trileptons
• High-Pt Zs, Right-handed Heavy Quarks,,.
• Summary- the Tevatron Opportunity at gtgt 1 fb-1
• A Mans
  Reach . Robert Browning

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Luminosity vs Time
Run II
Run II So Far
Run II
Run II
CDF
D0
Delivered Lum
(CDFD0)/2
Xmas week
Note pattern- integral grows when you dont stop,
with increasing slope
(Protons are smaller on this side (joke))
gt 40 pb-1/wk/expt
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Where is the Higgs? Mtop vs MW
1s
Assuming SM (H-gtbb)
Note log scale
Central Value Tev/LEP2
Mtop vs MW Status as of Summer 2006 (update
below) Central value prefers a light (too light)
Higgs
Puts a High Premium on Measuring Mtop and MW
precisely, no matter what happens at the LHC
(really diff. systematics at Tevatron.)
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Precision Msremnt of the Top Mass

CDF Lepton4jets Jet Energy Scale (JES) Set by
MW (jj) Note FSR, ISR, JES, and b/j JES
dominate- all measurable with more data, at some
level
4 2 1 3
Systematics
This is very good news!
like Mrenna
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Precision Measuremnt of the Top Mass
TDR
Aspen Conference Annual Values (Doug Glenzinski
Summary Talk) Jan-05 ?Mt /- 4.3 GeV Jan-06
?Mt /- 2.9 GeV Jan-07 ?Mt /- 2.1 GeV
Note we are doing almost 1/root-L even now
Setting JES with MW puts us significantly ahead
of the projection based on Run I in the Technical
Design Report (TDR). Systematics are measurable
with more data (at some level- but W and Z are
bright standard candles.)
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One old feature may be going away-top mass in
dileptons was too low
Mtop(All Jets) 173.4 4.3 GeV/c2
Mtop(Dilepton) 167.0 4.3 GeV/c2
Mtop(LeptonJets) 171.3 2.2 GeV/c2 ( Rainer
Wallny, Aspen 07)
Dilepton a little low, but statistically not
significant- also D0 number not low now
Take differences between the 3 modes
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New (Jan. 5, 07) CDF W Mass
From Ashutosh Kotwals Jan 5 Wine and Cheese
(Fermilab)
Data from Feb. 02-Sept 03 218 pb-1 for e 191
pb-1 for m
A Systematics Intensive Measurement.. This
is a precision spectrometer!
Note This is a small fraction of data taken to
date- this is to establish the calibrations and
techniques (so far) for Run II.
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New (Jan. 5, 07) CDF W Mass
From Ashutosh Kotwals Jan 5 Wine and Cheese
(Fermilab)
Run Ib Problem Now Solved 2 Calibrations of EM
calorimeter Zmass ?
E(cal)/p(track)
Electron and Muon Transverse Mass Fits
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New (Jan. 5, 07) CDF W Mass
From Ashutosh Kotwals Jan 5 Wine and Cheese
(Fermilab)
Note This is with only 0.2 fb-1 and one
experiment!
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MW-Mtop Plane with new CDF s

• MW 80.398 \pm 0.025 GeV (inc. new CDF 200pb-1)
• MTop 171.4 \pm 2.1 GeV (ICHEP 06)
• gt MH 8036-26 GeV MHlt153 GeV (95 C.L.)
• MH lt 189 GeV w. LEPII limit (M. Grunewald,
  Pvt.Comm.)

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Direct Limits on SM Higgs
This is the factor one needs to get the 95 CL
downto the SM Higgs Xscn
D0 has updated high mass region
CDF has updated low mass region
Im not willing to prognosticate (other than to
bet we dont see the SM Higgs)- would rather
postnosticate. However, lots of tools not yet
used- were learning many techniques, channels,
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New CDF Higgs result
Tau ID depends on good tracking, photon ID-
clean environment (all good at the Tevatron). Key
numbers are efficiency and jet rejection
J. Conway- Aspen
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New CDF Higgs result
J. Conway- Aspen
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New CDF Higgs result
Need More Data- keep on running. Other channels
too Have more handles- e.g. tau displaced
vertex..
J. Conway- Aspen
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New Physics inTop Production?
Note 1 TeV
Note no 500 GeV bump anymore
Fit ttbar system with known top mass(es) and
compare Mtt, pTtt,etatt,X, angular distributions,
etc. with SM expectations. Global fit allows
multi-dimensional comparisons. (Here is only Mtt,
for reasons I dont understand- Dan?)
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New Physics inTop Decay?
?
So far no smoking guns

• Fit for V-A, VA, longitudinal
• Charged Higgs (e,mutaub)
• Run I odd dilepton distributions

750 pb-1
VA fits, e.g
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Single Top Production
Yann Coadou, Aspen 07
CDF ME
D0
SM
CDF NN
CDF LK
Zack Sullivan, Aspen 07
Situation somewhat confused- Expect 1 and 2 pb in
s and t channels, respectively. Need more data,
wits
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SUSY? - Same-sign dileptons and trileptons
CDF SS 2 of e and/or m Pt1gt20,Pt2gt 10 Met gt
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Counting expt agrees, but some extra high Pt SS
events on tails. More data!
?
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SUSY? - trileptons
Many CDF analyses combined
Note- in 1000 pb-1 have only a few events. But
limits are in the 1 pb-1 range
DATA and SM! (fergit specific models)
Note In model interpretations limit is very
parameter dependent, and for LH plot there isnt
a limit on chargino mass.
No Slepton mixing (D0 case)
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SUSY? Missing Et Jets
Zone A Met gt 75, Ht gt 230, Jets gt 95, 55,
25 Zone B Met gt 90, Ht gt 280, Jets gt 120, 70,
25 Zone C Met gt 120, Ht gt 330, Jets gt 140, 100,
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CDF 371 pb-1 (1 fb-1 in progress)
SM Bkgd Makeup Zone B
Note how few events are out here from anything
Data Zone B HT (sum ET) spectrum
RESULTS DATA VS SM EXPECTATIONS
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SUSY? Missing Et Jetsnew (Jan. 5,07) D0
measurement
Cut
Cut
D0 1 fb-1
Gluino
3-jets
3 (Sub-) Analyses all with 2j gt 35, metgt 75
GeV, lepton veto Df12 lt 165o
dphi(met-jet) cuts
Thanks to D0 for help with this !
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SUSY? Missing Et Jets
Yellow is uncertainty from PDFs, Q2 scales in
quadrature (?)
Brown is D0 310 pb-1
New Combined (but useless to all but MSUGRA
experts) Exclusion MSUGRA Plot mlt0 A00 CDF
371 invpb Tan beta5 D0 1000 invpb Tan beta
3 (gr-red line is mean limit (?))
What would it take to get both D0 and CDF to
agree on some common points, e.g. same tan beta?
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eeggmet Event Followup and Signature-Based
Searches
Rather than look for a specific model, test the
SM predictions in inclusive but interesting
channels- gauge bosonsX, 3rd generation X
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Signature-based Searches eeggmet Event Followup
(lgX,ggX)
One event from CDF in Run I fot me (and Gordy,
remarkably enough) excited- 2 high-Pt electrons,
2 high-Pt photons, large missing Et, and nothing
else. Lovely clean signature- and very hard to
do in the SM (WWgg). 2 Run I analyses looked for
cousins in 86 pb-1 - spread a wide net 2
photonsX (Xanything Toback) and
photonleptonX (Berryhill). In g-lX found a
2.7s excess over SM. From PRL CDF Run I PRL
..an interesting result, but not a compelling
observation of new physics. We look forward to
more data
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SUSY? eeggmet Event Followup
Andrei Loginov repeated the lgmet analysis- same
cuts (no optimization- kept it truly a priori.
Run II 929 pb-1 at 1.96 TeV vs Run I 86 pb-1 at
1.8 TeV
Conclude that eeggmet event, lgmet excess,
Run II Wgg event all were Nature playing with
us- a posteriori searches show nothing with more
data
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Signature-based Searches eeggmet Event Followup
929 pb-1
929 pb-1
Distributions look good too- small numbers of
events on tail, but QCD bkgds there too. Sad- but
led to systematic search strategies- and emphasis
on SM prediction faithfulness- and not over yet.
(Andrei Loginov PhD Thesis, ITEP, Moscow
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Signature-Based High Pt ZX Searches
Look at a central Z X, for Pt gt 0, 60, 120 GeV,
and at distributions (idea being new heavy
things- e.g. QR a la Bj, Rosner, and/or Carlos)
Sasha Paramonov, UC
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Signature-Based High Pt ZX Searches
PTZgt0
PTZgt 60
PTZgt0
PTZgt 60
PTZgt120
PTZgt120
HT for PTZgt0, PTZgt 60, and PTZgt120 GeV Zs ee
(Left) and mm (right)
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Signature-Based High Pt ZX Searches
PTZgt0
PTZgt60
PTZgt 60
PTZgt120
Njets for PTZgt0, PTZgt 60, and PTZgt120 GeV Zs vs
Pythia (Tune AW)- this is the control for
MetJets at the LHC (excise leptons replace
with neutrinos).
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High Precision B-physics Mixing, Bs-gtmm
Note 1 psec 300 microns. SVT is critical.
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High Precision B-physics Mixing, Bs-gtmm
Pure Experimentalists reaction- pretty!
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High Precision B-physics Bs-gtmm
Copious Source of Bs Mass Resolution and
Trigger
Result World's best limits BR( Bs ? µµ ) lt
1.0x10-7 _at_95 CL BR( Bd ? µµ ) lt 3.0x10-8 _at_95
CL BR( Bs ? µµ ) lt 8.0x10-8 _at_90 CL BR( Bd ? µµ )
lt 2.3x10-8 _at_90 CL This is with 780 pb-1 have
more, and have improved analysis sensitivity-
new very soon. Getting to have teeth (imagine
10X datagtAccept.).
One of a number of rare-decay mode searches
Bs-gtmmX also new states with B quarks, . (whole
industry).
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Conclusion (but not yet an ending)

• Tevatron running well and producing lots of
  beautiful rich data
• Experiments running pretty well and producing
  lots of hands-on and minds-on opportunities (lots
  of room for new ideas, analyses, and hardware
  upgrades (great for students!)
• Precision measurements- MW, Mtop, Bs Mixing, B
  states- MW and Mtop systematics statisics-limited
• Can make a strong argument that pbar-p at 2 TeV
  tis the best place to look for light SUSY, light
  Higgs, as met at EWK scale, (MW/2, Mtop/4)
  doesnt scale with mass, root-s, and taus (maybe
  bs) are better due to lower mass in detector,
  and SVT and L1 tracking triggers,
• All of which implies keep the Tevatron running
  until we know that we dont need it.
• Gordy has played a big role in the thinking of
  the whole field- Happy Birthday Gordy!

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Happy Birthday Gordy!
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Backup- D0 btagging
Backup- lum on tape