# Presentation: 681957

## CDF Searches for New and Exotic Physics

- Steven Worm
- Rutgers University

- The TeVatron Connection, August 10 2004, Fermi National Laboratory

## New Results from CDF

- Supersymmetry 			pb-1
- GMSB diphotons			202
- Gluino  sbottom bottom		156
- Large Extra Dimensions
- LED from diphotons			345
- Leptoquarks
- LQ decays to eνjj, eejj, μνjj	203
- Technicolor
- Techni-ρ, techni-π 			162
- Compositeness
- e* eγ				200
- High mass Drell Yan
- Z’  ττ				195
- Even Weirder stuff
- Dirac Monopoles			  25

## Excited electrons:  e*

- Search for an excited or exotic electron in pp  e* + e  eγ + e
- Select events with eeγ final state
- Look for resonances in an eγ pair
- Backgrounds small; mainly Zγ but also Zj, WZ, multijet, γγj, Wjj
- Expected in Compositeness models
- Cross section parameterized by e* mass and compositeness scale (Λ)

- (U. Baur, Phys Rev D42, 3)

- contact interaction

- gauge mediated

- ˉ

- (K. Hagiwara *et al*, Z.Phys C29:115)

## Excited electrons:  e*

- In 200 pb-1, expect ~3 events, see 3 events
- Limits for contact interaction Me*/Λ vs. Me* shown at left
- Gauge mediated result plotted as a function of f/Λ vs. Me* at right
- For Me* = Λ, Me* >889 GeV/c2 (contact) or >208 GeV/c2 (gauge)

- Contact interaction:
- Me* > 889 GeV/c2

## Di-photon and Large Extra Dimensions

- Search high-mass γγ events for new physics (ie RS Gravitons)
- Backgrounds from
- Standard model diphoton
- Misidentifications: γj or jj where jet gives a hard π0
- Highest mass event:  m(γγ) = 405 GeV/c2

## Di-photon and Large Extra Dimensions

## Di-photons and Missing Energy

- Search for events with γγ + Missing Energy (MET)
- Gauge Mediated SUSY:  N1  γG, so pp  X + neutralinos  γγ+MET
- Event selection
- Two central photons, ET > 13 GeV
- Understanding MET is important
- Best limit expected at
- 	MET > 45 GeV
- Backgrounds include
- QCD + ‘fake’ MET
- e faking γ
- Cosmic rays, beam halo

- ˉ

- ~

## Di-photons and GMSB

- Expect ~0.6 events and see 0 events in 202 pb-1

- M(C1) > 168 GeV/c2  95% CL
- M(N1) >   93 GeV/c2  95% CL

- T.Plehn et al, PRL 83 (1999) 3780-3

## Leptoquarks

- Leptoquarks appear in many SM extensions including
- SU(5), SU(4) Pati-Salam models, Technicolor, Compositeness
- LQ carry both lepton and baryon number
- Finding leptoquarks at the TeVatron
- Pair-produced at the TeVatron predominantly via gg fusion
- Produce isolated high-pT leptons and 2jets
- TeVatron signatures include lljj, lνjj, and ννjj
- Make use of kinematics of LQ events; large jetET and lET

## Leptoquarks – 1st Generation

- ?

- m(LQ) > 230 GeV/c2  95% CL	          m(LQ) > 176 GeV/c2  95% CL

## Leptoquarks – 2nd Generation

- Signature is  μμ + 2 jets
- Make use of tight dimuon data and muon + track
- Backgrounds include QCD (fakes), top, and Z+2jets
- Expect 3.15 ± 1.17 events in 198 pb-1, see 2 events
- Limits set assuming  β = BR(LQμq) = 1

- M(LQ2) > 240GeV/c2
- 95% CL

## Technicolor

- Can search for Technicolor in many signatures
- New search explores same signature as SM Higgs (lνbb)

- ˉ

## Technicolor

## Gluino  sbottom bottom

- Gluino  sbottom bottom

- Large production xsection at the TeVatron, sbottom may be light
- Assume BR(b1  bΧ10) = 100%, R-parity conserved
- Assume m(g) > m(b1) > m(Χ10),   m(t) + m(Χ1+ ) > m(b1)
- Exploit b tagging and kinematics of events
- 3 jets > 15 GeV,  |η| < 2
- MET > 35 GeV
- Δφ(MET,jets) > 40o
- b-jet secondary vertex tag
- Backgrounds: QCD, W/Z+jets, Diboson, Top

- ~

- ~

- ~

## Gluino  sbottom bottom

- Single and double b-tagged events in 156 pb-1 of data

- Expect 16.4 ± 3.7				Expect 2.6 ± 0.7
- Observe 21 				Observe 4

- 						Perform counting experiment...

## Gluino  sbottom bottom

- For ΔM(gluino, sbottom) = 60 GeV/ c2
- Exclude 20.6 single tag events at 95% CL
- Exclude 8.7 double tag events at 95% CL

- Large exclusion region added
- in sbottom-gluino plane

## High-mass Drell Yan:  Z ́  ττ

- Tau physics important for high tanβ SUSY
- Tau finding algorithm much
- 	improved and tuned
- Shrinking cone implemented
- π0 reconstruction improved

- Checks with W
-  τν look good!

## Z ́  ττ

- Look in high mass region for new physics
- M(MET,τ,τ) > 120 GeV
- MET > 15 GeV
- |Δφ(MET, τl)| > 30o
- ‘counting experiment’
- Expect 2.83 ± 0.39 events, see 4
- Exclude Z’ < 394 GeV/c2  95% CL
- 	(Z’ with SM couplings)

## Dirac Monopoles

- Truly “Exotic” signature
- Large pulses in Time of Flight (TOF)
- Large ionization in drift chamber (COT)
- No curvature in r-phi
- Curvature in r-z (not used in analysis)
- Developed a dedicated trigger for Monopoles

## Monopole Search Results

- Drell-Yan like cross section

## Conclusions

## Bs  μ+μ- at CDF

## Backup Slides