# Presentation: 149435

## Hot Topics from CDF and D0

- D.Glenzinski
- Fermilab
- ICHEP 2006
- 01-August

## Fermilab Tevatron

- D.Glenzinski, Fermilab

- 01-Aug-2006

##   Tevatron Run-II

-  Data set has doubled every year

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Experiments:  CDF

- Features:
-  Precision silicon vertexing
-  Large radius drift chamber
-   (r=1.4m)
-  1.4 T solenoid
-  EM+HAD Calorimetry
-  muon chambers
-   (|| < 1.1)
-  Particle Identification

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Experiments: CDF

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Experiments:  DZero (D0)

- Features:
-  Precision silicon vertexing
-  Outer Fiber Tracker
-   (r=0.5m)
-  2.0 T solenoid
-  EM+HAD Calorimetry
-  muon chambers
-   (|| < 2.0)

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Experiments: D0

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Tevatron Results Published

- From Run II:
- 41 Physics publications by CDF
- 33 Physics publications by D0
- In 2005:  1 Tevatron publication every 7 days
- So far in 2006
- Each experiment has ~15 Published+Accepted, plus another ~15 submitted analyses
- At this conference
- A total of 39 talks in parallel sessions

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Tevatron Results at ICHEP-06

- Parallel Speakers
- F.Canelli, A.Hocker, J.Nielsen, C.Hill, K.Hatakeyama, A.Kupco, M.Sanders, C. Schwanenberger, S.Blessing, M.Verzochi, G.Bernardi, D.O’Neil, D.Wicke, T.Moulik, M.Strauss, G.Borrisov, A.Nomerotski, S.Anderson, W.Taylor, E.Kajfacz, H.Greenlee, T.Hebbeker, P.Savard, I.Gorelov, B.Kilminster, E.Lipeles, M.Lancaster, A.Kraan F.Wuerthwein, P.Busey, R.Field, S.Giagu, S.Farrington, L.Pinera, M.Kreps, Y.S.Chung, A.Hamilton, A.Pronko, W.Wagner
- Plenary Speakers
- R. Barlow “Rare B and Tau Decays”
- E. Gallo “Beyond the Standard Model (Experiment)”
- D. Wood “Precision Electroweak Results”

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Tevatron Physics Program

- (b)

-  QCD
-  Heavy Flavor
-  Electroweak
-  Top Quark
-  New Phenomena

- I Will discuss only a few
- of the “Hottest” Results

-  QCD
-  Heavy Flavor
-  Electroweak
-  Top Quark
-  New Phenomena

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Hot Topics (Doug’s Opinion)

-  Latest Bs Mixing Results
-  Latest Top Mass Results
-  Latest New Phenomena Results

-  Our *raison d’etre*
-  Unique to Tevatron Program
-  Have significant impact

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Bs Mixing

- D0 Results using 1 fb-1
-  CDF Results using 1 fb-1

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Bs Mixing: Motivation

- Bs Mixing: Motivation

- Bs particles can change into their anti-particles
- The rate at which Bs         Bs oscillate : ms
- Important consistency check of CKM quark-mixing Matrix in Standard Model:  ms ~ Vts

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Bs Mixing: Basics

- Probability that Bs at t=0 decays as Bs at time t
- Experimentally, measure Asymmetry as a function of proper decay time

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Bs Mixing: Basics

- Perfect Detector

-     Actual

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Bs Mixing: Ingredients

- For each event we need to determine
- Bs or Bs at production?
- Bs or Bs at decay?
- Proper decay time

- mixed
- or
- unmixed?

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Bs Mixing: 1) Identify Sample

- Bs is reconstructed via semi-leptonic decays

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Bs Mixing: 1) Identify Sample

- Bs reconstructed via hadronic decays: unique to CDF

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Bs Mixing: 1 fb-1 Yields

- Next, determine proper decay time...

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Bs Mixing: 2) Proper Decay Time

- Determine proper decay time from final state:

-  determined from Monte Carlo (MC) simulation

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Bs Mixing: Decay Time Resolution

- Hadronic decays have excellent proper time resolution

- proper decay time resolution () / cm

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Bs Mixing: 3) Flavor Tagging

- Bs Mixing: 3) Flavor Tagging

- B-Hadron Production at the Tevatron
- Predominantly produced in bb pairs

- A) Opposite Side Tag (OST)
-       Infer production flavor
-       knowing flavor of the
-       other b in the event

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Bs Mixing: 3) Flavor Tagging

- Flavor Taggers are characterized by:
- The *effective* statistics depend on these terms:

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Bs Mixing: Flavor Tagging

- Determining the dilution:

- B-

- +

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Bs Mixing: Flavor Tagging Performance

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Bs Mixing: Sensitivity

- “Sensitivity” = *expected* 95% CL upper limit on ms
- Determined from data

- World 2006: 18
- D0 2006: 17
- CDF 2006: 25

- ms Sensitivity (ps-1)

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Bs Mixing: Measuring ms

- Look for evidence of Bs mixing using Amplitude Scan
- Fourier transform to frequency domain
- Determine amplitude for fixed ms
- Scan ms : Amplitude = 1 at true ms,  0 otherwise

- ms (ps-1)

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Bs Mixing: D0 Results (Mar-06)

- 17< ms < 21 ps-1 @ 90% CL

-        For more details see the talk by T.Moulik.

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Bs Mixing: CDF Results (Apr-06)

- Bs Mixing: CDF Results (Apr-06)

- ms = 17.31       (sta)  0.07 (sys)
- 0.2% probability Random tags would look as significant

- CDF 1fb-1

- hep-ex/0606027 (accepted by PRL)

-          For more details see the talk by S.Giagu.

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Bs Mixing: Constraints

-  measured ms agrees
-   with SM prediction
-  relative precision of
-   measured
-        ms)/ms = 1.5%
-        md)/md = 1.0%
-  precision of measured
-   ms is statistics limited
-      (syst)/ms < 0.5%

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Bs Mixing: Constraints

-   constrain CKM
-  agrees with SM prediction
-  x5 more precise than
-   previous determination
-  limited by Lattice uncertainty

- Bs Mixing: Constraints

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Bs Mixing: Constraints

- For latest fit results see talks by S.T’Jampens, V.Vagnoni,and M.Bona

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Bs Mixing: New Physics Constraints

- Use ms and CP violation in Bs sector to constrain New Physics contributions
- Bs sector largely unexplored
- Bs sector largely independent of Bd sector
- Bs sector more sensitive than Bd sector
- New Physics can affect ms and CP phase ()

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Bs Mixing: NP Constraints

- For decails see:
- hep-ph/0012219, hep-ph/0406300,
- hep-ph/0605028, talks by
-  S.T’Jampens and V.Vagnoni

-  Recall

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Bs Mixing: NP Constraints

-  CDF and D0 can
-   also constrain 
-  D0 combines 3
-   measurements
-   to get first constraints
-  precision of all 3 are
-   statistics limited
-  more data to come
-  CDF + D0
-  direct CP using flavor
-   tagged decays

-        For more details see the talk by G.Borissov.

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Top-Quark Mass

- D0 Results using 0.4-1 fb-1
-  CDF Results using 1 fb-1

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Top Mass: Motivation

- Mt is a fundamental parameter of the Standard Model
- Since Mt is large, quantum loops involving top quarks are important to include when calculating precision observables (e.g. sin2w, Rb, Mw,...)
- Within SM, particularly important to help constrain MH

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Top Mass: Motivation

- Mt important input for any model trying to describe high energy particle physics
-  In MSSM at tree level: Mh<Mz  (very excluded)
-    w/ Mt loop corrections: Mh < 135 GeV
- Mt impacts soft-SuSy breaking phenomenology
- Mt plays critial role in verifying gauge unification through RGEs
- Precision Mt crucial to understanding underlying theory of HEP, whether SM or SuSy or ...

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Top Mass: Basics

- Top quarks predominantly produced in pairs
-     via the strong interaction
- Production cross-section:  ~ 7 pb at Tevatron

- 85%

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Top Mass: Basics

- Because Mt > Mw + Mb,  and Vtb>> Vts,Vtd
- Final state determined by W decays

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Top Mass: Basics

- We measure Mt in each of these final states
- Dilepton (DIL)
- Lepton+Jets (LJT)
- All Jets (AJT)
- Compare across channels for consistency
- Combine all channels for improved precision

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Top Mass: Ingredients

- To measure Mt we need to:
- Collect top quark sample
- Reconstruct observable sensitive to Mt
- Unfold experimental effects

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Top Mass: 1) Collect Sample

- Dilepton: ttllbb
- 2 high energy leptons, missing energy (), 2 jets
- In 1 fb-1: #signal~50, Purity~65%
- Lepton + Jets: ttlqq bb
- 1 high energy lepton, missing energy (), 4 jets (1 Bjet)
- In 1 fb-1: #signal~230, Purity~90%
- All Jets: ttqq qq bb
-     6 jets (1 Bjet)
- In 1 fb-1: #signal~200, Purity~30%

- For more details see talks by C.Hill and D.O’Neil

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Top Mass: 1) Collect Sample

-  cross-sections and kinematics agree with Standard Model

- For more details see talks by D.Wicke, A.Kraan, S.Anderson

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Top Mass: 2) Event Reconstruction

- DIL : 2 combinations
- LJT: 12 combinations
- AJT: 90 combinations

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Top Mass: 2) Reconstruction

- Jet Energy Scale == Absolute Mass Scale

-  hadronization,
-   non-linearities, pile-up,
-   multiple-interactions,
-   underlying event
-  From Data and MC
-  known to ~3% for Mt
-   jet energies
-  Leading Run I syst
-  Reduced in Run II

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Top Mass: 2) Reconstruction

- Run II analyses further constrain JES
- In-situ constraint possible by comparing observed
-    Mqq to known Mw (in LJT and AJT channels)
- with 1 fb-1, reduces (JES) systematic by factor of 2
- (JES) will scale with sample statistics

- Mqq = Mw

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Top Mass: 3) Unfold Exp Effects

- Use detailed Monte Carlo to unfold experimental effects and determine Mt from Mreco

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Top Mass: Results

-  Excellent results in each
-   channel
-  Combine all CDF+D0,
-   Run-I+Run-II
-  Account for all correlations
-  Uncertainty:
- Mt(stat)  = 1.2
- Mt(JES) = 1.4 GeV/c2
- Mt(syst) = 1.0

- Stat+JES scale with sample size

- Mt determined to 1.2%!

- (cf. http://tevewwg.fnal.gov)

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Top Mass: Results

- Jet Energy Scale is leading systematic in all channels

- ISR, FSR, PDF, NLO effects

- Composition, Normalization, and Shape

- MC statistics, Method, B-tagging, etc

- uses in-situ JES calibration comparing Mqq to Mw

- Single most precise determination

- For more details see talk by F.Canelli

- (in units of GeV/c2)

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Top Mass: Results

- The channels are consistent at 15% level

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Top Mass: Future

- Extrapolations based on present methods
- Solid: pessimistic
- Dash: optimistic
- Reality: in between
- Have surpassed Run-II goal
- TeV will measure Mt with <1% precision

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Top Mass Constraints

-  Indicates Higgs is light, where our sensitivity best!

- D.Glenzinski, Fermilab

- 01-Aug-2006

## New Phenomena

- Where do we stand?
-  Where will we go?

- D.Glenzinski, Fermilab

- 01-Aug-2006

## New Phenomena: Motivation

- The Standard Model
- is an effective (low Energy) theory
- does not include a description of gravity
- has shortcomings
- There could be something more... but what?
- SuperSymmetry (mSuGra, GMSB, SO(10),...)
- Compositeness, 4th Generation, LeptoQuarks
- Extra Dimensions, Technicolor
- We look for all of these things

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Searching for

-  Higgs *required*
-   to generate W, Z
-   masses
-  Precision EWK
-   prefers light Higgs
-  Most SuSy needs
-   1 light Higgs

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Higgs: SM Production

- For MH=140-110:   (WH+ZH)=100-300 fb
- For MH=180-140:   (ggH)=150-500 fb

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Higgs: MSSM Production

- (MSSM/SM) = 1-100 depending on Susy parameters;  Tevatron sensitive to large tan

- =h,H,A

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Higgs: Decay

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Higgs: Experimental Signatures

- Experimental final state determined by W, Z decays
- The most important for the SM Higgs are
- Each experiment has results in all of these final states

- For more details see talks by B.Kilminster, A.Hocker, and G.Bernardi

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Higgs: Limits

- Expected sensitivity within factor of
- 5-10 of SM for all 110 < MH < 200!

- Additional sensitivity from more data, and
- application of known improvements to all channels

- A lot of work - but we will reach SM sensitivities

- Differences in single exp
- sensitivity owing to these
- luminosity differences

- We combine ~15 CDF+D0 results (250-1000 pb-1)

- CDF/D0 updates comlimentary
- Tev expected = Single experiment @ 1.3 fb-1

- (cf. http://tevnphwg.fnal.gov)

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Higgs: MSSM Sensitivities

- Tevatron will have sensitivity to MSSM
- higgs for all tan>30 and MA<200 GeV/c2

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Higgs: Progress

- SM cross-sections for (di)boson production

- Have >106 leptonic Ws in 1 fb-1

- Tau identification well understood.

- We have ~105 leptonic Zs in 1 fb-1

- We have ~103 W,~102 Z  in 1 fb-1

- We have ~102 WW  in 1 fb-1

- We have ~10 leptonic WZ  in 1 fb-1

-  with 1 fb-1 we’re observing
-   cross-sections of order 1 pb
-   in final states similar to SM H
-  expect a factor of ~8
-   more data
-  experimental sensitivity on
-   track and will get better
-  extended b-tagging
-  improved jet resolution
-  CDF and D0 enthusiastically
-   pursuing the Higgs

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Conclusions

- Tevatron performing well
- 1 fb-1/experiment in hand
- Expect 6-8 fb-1/experiment by end 2009
- CDF and D0 performing well
- Publishing wide spectrum of world class results (CDF+D0 2005 avg: 1 published paper/week)
- Ready to take advantage of coming data
- Enthusiastically pursuing New Physics and Higgs

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Conclusions

- The LHC will inherit
- Precise determination of ms and constraints on CP phase in Bs sector Bs
- Precision Mt (Mt=1.0-1.5 GeV/c2) and
-    Mw (Mw=15-25 MeV/c2)
-  A more restricted New Physics parameter space

-  A higgs mass

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Backup Slides

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Bs Mixing: Decay Time Resolution

- Bs Mixing: Decay Time Resolution

- (semi-leptonic) depends on decay time

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Bs Mixing: Likelihoods CDF

- Final significance and measurement of ms using Lhood ratio

- min = -6.75

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Bs Mixing: Likelihoods D0

-  Resolution
-  K-factor variation
-  BR (BsDsX)
-  VPDL model
-  BR (BsDsDs)

- Mar-06

- D0 Jul-06

- Systematics

- D.Glenzinski, Fermilab

- 01-Aug-2006

## Bs Mixing: D0 A-Scans for New Modes

- D.Glenzinski, Fermilab

- 01-Aug-2006