X~

X~_

p uup_

uu__

µ+

µ−

Bs

Prospects for SUSY Discovery at the

Tevatron

Prospects for Prospects for SUSY Discovery at the SUSY Discovery at the

TevatronTevatron

B Teruki Kamon(Texas A&M University)

forCDF and DØ Collaborations

SUSY 2002The 10th International Conference

on Supersymmetryand Unification of Fundamental InteractionsDESY, Hamburg, Germany, June 17-23, 2002

June 18, 2002 SUSY 2002 2

Motivation

Tevatron UpgradesLuminosity ProfileLuminosity Now

CDF and DØ UpgradesImprovementsTrigger Rates

Selected TopicsDirect SearchesSUSY in Bs µµ

Summary

OutlineOutline

June 18, 2002 SUSY 2002 3

MotivationMotivation

Rp or Rp/

SUGRAGMSBAMSBgMSB~

June 18, 2002 SUSY 2002 4

TevatronTevatron

CDFDØ

∫ Ldt = 15 fb−1

4.82.32.5Interactions/xing

1323963500Bunch xing (ns)

10517.33.2∫ Ldt (pb−1/week)

5.2x10328.6x10311.6x1030typ L (cm−2s−1)

1.961.961.8√s (TeV)

140x10336x366x6Nbunches

Run 2bRun 2aRun 1b

June 18, 2002 SUSY 2002 5

Why 15 Why 15 fbfb−−11??

Xll/ZZWWgglν(νν) bbW(Z) hqq

** −+→→

→→

Run IIb

Run IIa

Tevatron (Run IIa/IIb)

Source: Higgs working group report (SUSY/Higgs Workshop, 1998)

x

KEY:KEY:σ(Mbb)/Mbbimprovedby 30%

June 18, 2002 SUSY 2002 6

Luminosity Luminosity ProfileProfile

Also see Dave McGinnis, “Tevatron Collider Luminosity Upgrades,”Joint Experiment Theoretical Physics Seminar, March 8, 2001

Run IIa

Run IIb

June 18, 2002 SUSY 2002 7

Luminosity Luminosity NowNow

Peak Luminosity:1.95x1031 (actual @6/01/02)3.93x1031 (goal @6/01/02)8.64x1031 (goal @12/31/02)

June 18, 2002 SUSY 2002 8

CDF and DCDF and DØØ((FermilabFermilab--PubPub--96/39096/390--E, E, FermilabFermilab--PubPub--96/35796/357--E)E)

1.0

2.0

3.0

δpT /p

T 2= 0.001δp

T /pT 2= 0.004

TOF

δpT/pT2 = 0.002

(with SMT + fiber tracker)

Also new front-end, DAQ and trigger electronics for both detectors

June 18, 2002 SUSY 2002 9

CDF and DCDF and DØØ UpgradesUpgrades

New front-end, DAQ and trigger electronics

New silicon vertex (SVX) detectorNew central tracker drift chamberNew scintillation-tile end-plug EM and

HAD calorimetersIncreased η-φ coverage for muon

detectorNew time-of-flight (TOF) system

New front-end, DAQ, and trigger electronics

New silicon micro-strip tracker (SMT)New scintillation-fiber tracking systemNew 2T solenoid magnetNew preshower detector added to the

existing calorimetryNew muon system

CDFCDF DDØØ

2.02.03.02.01.72.01.73.01.5DDØØ2.02.03.02.01.02.01.2(1.5)2.41.1CDFCDFcbjτhτh

trigµµtrigeetrig|η| range

June 18, 2002 SUSY 2002 10

CDF and DCDF and DØØ ImprovementsImprovements

p: δpT/pT2 = 0.004 for 1 < |η| < 2

(with SVX) [Still δpT/pT

2 = 0.001 for |η|< 1]e: η coverage, 33% up for ttµ: η coverage, 12% up for tt

(30% up for W)ηtrig: 0.6-1.0 to 1.2(1.5) at the beginning (later) of Run II

τ: ID in 1 < |η| < 2 b: Increase εb(SVX)2 for tt by 62%

SVX trigger (SVT) at Level 2

p: δpT/pT2 = 0.002

(with SMT + fiber tracker) e: Add an inclusive e trigger

with ET > 7 GeVµ: Trigger/ID: pT > 1.5 GeV/c

(from 4 GeV/c)High pT resolution, improved by a factor of 2

τ: εID ~ 40% (from 13%)b: εb(SMT) ~ 50% for t Wb

SMT trigger (STT) at Level 2

CDFCDF DDØØ

June 18, 2002 SUSY 2002 11

CDFCDF DØØ

Offline

Level 2

Level 3

Level 1

45 kHz

300 Hz

75 Hz

Offline

Level 2

Level 3

Level 1

1000 Hz

50 Hz

5 kHz

7 MHz11 MHz11 MHz

CDF and DCDF and DØØ Trigger RatesTrigger Rates

“Balance”the trigger budget

between QCD-Bottom-EW-Top-Higgs-Others

L = 2x1032 cm−2s−1

TeV2000 Report (Fermilab-Pub-96/082),Section 6 – SUSY Physicsa) Based on MSSM or

mSUGRAb) Experimental signatures

Trilepton (χ1+χ2

0)ET + jets (g and q)

ET + cc (t1 cχ10)

ET + bb (t1 bχ1+)

~ ~~~

~~~~

//

/

Proceedings of Run-II SUSY/Higgs Workshops (May & Nov. 1998)

hep-ph/0003154 (SUGRA)hep-ph/0008070 (GMSB) hep-ph/0006160 (BTMSSM)hep-ph/0010338 (Higgs)Trigger/ID for b,τ, low ET,

and γ (pointing back, timing): key in success

/

History/History/Herstory Herstory of Prospect of Prospect ……

June 18, 2002 SUSY 2002 13

Alternative to Inclusive Alternative to Inclusive EETT, Jet, Lepton , Jet, Lepton Triggers for Higher LuminosityTriggers for Higher Luminosity

Low ET(25)+J(10)+J(10) TriggerHigh mass gluino search with the

canonical ET+jets signature –much more efficient with lower ET threshold

Lower ET threshold at Level 2 will drive the stop and sbottom analyses

OK (80%) for W( lν, τν)+jetsOK efficiency (60%) for topOK efficiency for Higgs

56% for W( jj)H125( ττ)72% for Z( νν)H140( bb)

Reliable parametrization of QCD high ET tails to reduce the systematic uncertainty

Two b’s Trigger w/ SVTH( bb) + XCalibration: Z( bb) + X

Lepton(8) + Track(5) Triggerττ( lτh) final state as well as ll

e.g., χ1+( τνχ1

0)χ20( ττχ1

0)bb+A( ττ)

Caliblation: Z ττ( lτh)

//

//

/

//

~ ~ ~ ~

Source: SUGRA working group report (SUSY/Higgs Workshop, 1998)

June 18, 2002 SUSY 2002 14

Trigger forTrigger for ττττ + + XXExperimental challenge:

Trigger (and ID) for relatively low PT τ leptons for higher luminosity

Lepton+track trigger is promising, compared to Di-τh trigger and ET+τh trigger (including W τ ν)

Many interesting di-τ final statesin SUSY and Higgs:1) lττ and τττ are dominant final

states in chargino-neutralino production at large tanβ of SUGRA

2) t1 bτν in mSUGRA3) Stau NLSP in GMSB4) t1 τb in Rp violation (λ’333)5) h/A ττ6) bb+A( ττ) or b+A( ττ)

~

~

~/

0

5

10

15

20

25

30

35

40

45

50

0 1 2 3 4 5 6 7

OS dataZ→ττ(MC)

+LS Data

Number of charged tracks in τ cone

Eve

nts

CDF Preliminary (106 pb-1)

e e ++ττhh

0

2.5

5

7.5

10

12.5

15

17.5

20

22.5

0 20 40 60 80 100

E⁄ T

Eve

nts

/ 5 G

eV

0

2

4

6

8

10

12

14

16

0 50 100 150

M(e,τh)

Eve

nts

/ 5 G

eV/c

2

AnalysisAnalysisCDF Preliminary (106 pb-1)

02.5

57.510

12.515

17.520

22.5

0 20 40 60 80 100

OS dataZ→ττ

+QCD+W(→lν)+jet+Diboson+top

ET(e)

Eve

nts

/ 5 G

eV

0

2

4

6

8

10

12

14

0 20 40 60 80 100

pT(τh)

Eve

nts

/ 5 G

eV/c

0

5

10

15

20

25

30

0 50 100 150

∆φ(e,E⁄ T)

Eve

nts

/ 10

deg.

0

5

10

15

20

25

30

0 50 100 150

∆φ(e,τh)

Eve

nts

/ 10

deg.

“Z analysis”

τ

τZ

pTl > 10 GeV/c

pTτh > 15 GeV/c

Run I Run I ee++ττhh

ProspectsProspectsincluding new ideas …

“Higgs and beyond …”

Squarks/GluinosSquarksSquarks//GluinosGluinosq~

q~_

p uup_

uu__

mSUGRA/MSSM

June 18, 2002 SUSY 2002 17

Experimental Signaturesa) ET + jets + 0 leptonb) ET + jets + 1 leptonc) (Like-sign) dileptond) …

//

Signatures for Signatures for gg//qq~~ ~~

Ml > Mτ@ large tanβ

Cle

aner

, but

smal

l Br Cascade decays

g qq q

W

qq

g qq q

Z

qq

g

qq q

W

g

qq q

Z

many possible signaturesleptons jets ET

b jets ie g bb

even top quarks g tt

τ~~ ~

June 18, 2002 SUSY 2002 18

CDFCDF, PRL 88 (2002) 041801Nj15 > 3, ∆φmin(j,ET) > 0.5 rad (28.6o)Ntrk10

iso = 0, ETj1 > 70, ET

j2 > 30 GeVET > 70, HT=ET+ET

j2+ETj3 > 150 GeV

/

/ /

V. Krutelyov et al., PLB 505 (2001) 161Nj15 > 4, ∆φmin(j,ET) > 30o

Nl15 = 0ET > 100, ET+ET

j1+ETj2 > 350 GeV/

/

/

gg//qq: Jets + : Jets + EET T + 0 Lepton+ 0 Lepton//~~ ~~

10

10 2

250 300 350 400 450 500

Mg[GeV]

Sign

ific

ance

5

Tevatronjets + E/ T

NBG = 73 fb

mSUGRAµ > 0, A0 = 0Mg

~ Mqtanβ =3, 10, 30

∼ ∼Insensitive to tanβ

Final ET and HT cuts are optimized foreach box. (e.g., ET>110, HT>230 in B)

//

Nobs=74, NBG(QCD,tt,W/Z)=76+13

0

50100

150

200250

300

350400

450

500

0 100 200 300 400 500 600

LEP ILEP I

CDF 97CDF 97

This analysisThis analysis

∼ ∼ g gm (GeV/c2)

∼

∼

q

qm

(G

eV/c

2 )

m q ∼=m g

∼

mq< ∼ mχ

0 ∼ 1

q=u,d,s,c,b∼ ∼ ∼ ∼∼∼

q=u,d,s,c∼ ∼ ∼ ∼∼µ<0mSUGRA

µ=-800 GeV/c2

MSSM

D∅D∅

A

B CD

tanβ = 3

Blin

d Se

arch

Run I84 pb−1

x

Run II15 fb−1

300 GeV/c2

410 GeV/c2

10

30

3

June 18, 2002 SUSY 2002 19

10-1

1

0 50 100 150 200 250 300

m0[GeV]

Sign

ific

ance

Tevatronl + jets + E/ T

gg//qq: Jets + : Jets + EET T + 1 Lepton+ 1 Lepton//~~ ~~

DDØØ, hep-ex/0205002, to PRDNj15 > 4Ne20 = 1ET > 25, Neural Net (NN) Analysis/

V. Krutelyov et al., PLB 505 (2001) 161Nj15 > 2, ∆φmin(j,ET) > 30o

Nl15 = 1, MTlν < 50 or >110 GeV/c2

ET > 40, ET+ETj1+ET

j2 > 350 GeV/

/

/

Run II15 fb−1

Nobs=72, NBG(W+4j,QCD,tt,W+2j)=80.3+10.4

∼m0 (GeV)

m1/

2 (G

eV)

D∅ dilepton

LEP I

D∅ single electron

0

20

40

60

80

100

0 50 100 150 200 250 300

Run I93 pb−1

tanβ = 3, µ < 0A0 = 0

Neu

ral N

et

PRD 63 (2001) 091102(R)

m1/2 = 160 GeV(Mg

~ 420 GeV/c2)∼

NBG = 70 fb

10

30

3

Sensitive to tanβ

mSUGRAµ > 0, A0 = 0m1/2 = 160 GeVtanβ =3, 10, 30

June 18, 2002 SUSY 2002 20

Limits on Limits on MMgg in Jets + in Jets + EETT1. DØ, PRL 75(1995) 6182. CDF, PRD 56(1997) 13573. DØ, PRL 83(1999) 49374. CDF, PRL 88(2002) 041801

5. S. Mrenna et al., PRD 53 (1996) 1168using PYTHIA with a toy detector simulation

6. V. Krutelyov et al., PLB 505 (2001) 161tanβ = 3, 10, 30 & µ > 0using ISAJET v7.48 with

“SHW” detector simulation

They are consistent with many other papers such as H. Baer et al., …..

All SUSY processes

Low tanβµ < 0

55σσ reachesreaches

95%

C.L.

//~~

Chargino-NeutralinoCharginoChargino--NeutralinoNeutralinoχ1

+~

χ20~

p uup_

uu__

mSUGRA

June 18, 2002 SUSY 2002 22

3 Leptons + 3 Leptons + EETTTrilepton plus missing ET fromchargino-neutralino production is oneof the most cleanest (promising)s ignatures in hadron col l iders .

Run I: Searched for clean trilepton final state (eee, eeµ, eµµ, µµµ) with low pT(e.g, 11, 5, 5 GeV/c).

CDF: PRL 80 (1998) 1591Nobs = 0 (1.5+0.5 expected)

DØ : PRL 80 (1998) 5275Nobs = 0 (1.2+0.2 expected)

W i t h i n M S S M / m S U G R A , t h e maximum reach on the chargino mass was up to about 70 GeV/c2 for small tanβ scenario (e.g., tanβ = 2) with lighter slepton mass.

//

June 18, 2002 SUSY 2002 23

τ

χ20~ ττ~

χ10~

3 Leptons + 3 Leptons + EETTτ1 could be lighter for large tanβand small m0

Large tanβ – lττ and τττ are dominant final states from chargino-neutralino production.

To maximize the reach, low pTLepton(e/µ)+track trigger is crucial to detect hadronicallydecaying tau lepton (τh).

//~ V. Barger and C. Kao, hep-ph/9811489,

PRD 60 (1999) 115015

Strong tanβ Dependence

June 18, 2002 SUSY 2002 24

3 Leptons + 3 Leptons + EETT1) Look for clean trilepton final state

( e e e , e e µ , e µ µ , µ µ µ ) w i t h pT(l1,l2,l3)>11,7,5 GeV/c, where soft leptons (e or µ) from τ decays are also accepted. See, for example,

V. Barger and C. Kao, hep-ph/9811489, PRD 60 (1999) 115015

[the SM background calculations including effects from W*, Z* and γ* are substantially improved.]

2) Also accept τh

H. Baer et al., hep-ph/9802441PRD 58 (1998) 075008

J. Lykken and K. Matchev, hep-ph/9903238PRD 60 (2000) 015001

K. Matchev and D. Pierce,hep-ph/9904282PRD 60 (1999) 075004

lll and LS ll+τh final states are the bestchannels for the study of chargeno-neutralino production.

//

June 18, 2002 SUSY 2002 25

3 Leptons + 3 Leptons + EETTK. Matchev and D. Pierce, hep-ph/9904282, PRD 60 (1999) 075004

//Dashed curves – 3σ reaches w/ “standard” cuts

pT(l1,l2,l3)>11,7,5 GeV/c; ET>25 GeV; Ml+l− cutsSolid curves - 3σ reaches w/ optimized cuts

11,7,5;25;70 for small m0; 11,11,11;15;70 for large m0

30 fb−1

10 fb−1

2 fb−1

/

No reach via llτhSimilar reach via llτh

LEPLEP

Stop/SbottomStop/Stop/SbottomSbottomt~

t~_

p uup_

uu__

mSUGRA/MSSM

June 18, 2002 SUSY 2002 27

StopStop

The lightest stop, t1, is a very good candidate for studying at the Tevatron:

a) Experimentally, larger cross section compared to that for sleptons

b) Theoretically, lighter stop mass preferred for larger tanβ & |A0|

mSUGRAµ > 0m1/2 = 300 GeVm0 = 300 GeVA

0=

−671

A0

= −1

342

A0

= 0

Mh< 115 GeV/c2

Mh< 95 GeV/c2

Too light ortachyonic

R. Demina et al., hep-ph/9910275, PRD 62 (2000) 035011

~

June 18, 2002 SUSY 2002 28

Stop/Stop/Sbottom Sbottom DecaysDecays

t1

χ1+*

b

l,τ

ν

~

~~

t1

χ1+*

b

W

χ10

~

~~

b1

b

~

χ10~

t1

c

W*~

χ1+*~

χ10~

b

((a)a)

((b)b) ((d)d)

t1

χ1+*

b

~

~τ

ν

~

((c)c)

((f)f)

((e)e)

t1

χ1+

b

χ10

~

~~

W

l,τ

ν

June 18, 2002 SUSY 2002 29

StopStop

LEP χ∼

1+ limit

ECM=2.0 TeV

L=20 fb-1

L=4 fb-1

L=2 fb-1

M(t

∼ 1)=

M(b

)+M

(χ∼ 1+ )

t∼1 → b χ

∼1+

M(t∼1),Gev/c2

M(χ∼

1+ ),G

ev/c

2

ECM=2.0 TeV

L=20 fb-1

L=4 fb-1

L=2 fb-1M(t

∼ 1)=

M(b

)+M

(l)+M

(ν∼ )

LEP ν∼ limit

t∼1 → b l ν

∼

M(t∼1),Gev/c2

M(ν∼ ),

Gev

/c2

l10+b12+j8+ET25/ l+8+l−

5+j15+ET30/Ml < Mt < Mχ1

+~~~Mt > Mχ1+~~

σBG(W+jets,top,QCD,..) = 980 fb σBG(QCD,Z/γ*+jets,top,..) = 50 fb

pT or ET cuts

Br(t1 blν or blν)=2/3~ ~ ~Br(t1 bχ1+)=1

Br(χ1+ lνχ1

0)=0.22~

~~~

(m0<0.55 m1/2 in mSUGRA)

R. Demina et al., hep-ph/9910275, PRD 62 (2000) 035011

144 GeV/c2

~190 GeV/c2

(Run IIa)

(Run I/DDØØ)

June 18, 2002 SUSY 2002 30

StopStop

ECM=2.0 TeV

L=20 fb-1

L=4 fb-1

L=2 fb-1M(t

∼ 1)=

M(b

)+M

(l)+M

(ν∼ )

LEP ν∼ limit

t∼1 → b l ν

∼

M(t∼1),Gev/c2

M(ν∼ ),

Gev

/c2

l10+τh15+j15+j15+ETxx/Mτ < Mt < Mχ1

+~~~

(m0< 5 m1/2 , large tanβ in mSUGRA)~

Br(t1 bτν )=1~ ~

R. Demina et al., hep-ph/9910275, PRD 62 (2000) 035011

τ channel sensitivity to be checked …τ channel sensitivity to be checked …

t1

χ1+*

b

τ

ν

~

~

~

June 18, 2002 SUSY 2002 31

Stop/Stop/SbottomSbottom

LEP χ∼

10 limit

ECM=2.0 TeVL=20 fb-1

L=4 fb-1

L=2 fb-1

M(t∼ 1

)=M

(c)+

M(χ

∼ 10 )M

(t∼ 1)=

M(b

)+M

(W)+

M(χ

∼ 10 )

M(t∼ 1

)=M

(t)+M

(χ∼ 10 )

t∼1 → c χ

∼10 or t

∼1 → b W χ

∼10

M(t∼1),Gev/c2

M(χ∼

10 ),G

ev/c

2

c15+j15(+j15)+ET40/Mt > Mχ1

0~~

l10+b12+j8+ET25/Mb > Mχ1

0~~

b15+j15(+j15)+ET40/

LEP χ∼

10 limit

ECM=2.0 TeV

L=20 fb-1

L=4 fb-1

L=2 fb-1

M(b

∼ 1)=

M(b

)+M

(χ∼ 10 )

b∼

1 → b χ∼

10

M(b∼

1),Gev/c2

M(χ∼

10 ),G

ev/c

2

σBG(W+jets,QCD,..) = 160 fb σBG(W+jets,top,QCD,..) = 980 fb

mSUGRA

SUGRA(non-universalscalar mass)tanβ > 20 & µ < 0

R. Demina et al., hep-ph/9910275, PRD 62 (2000) 035011

~115 GeV/c2 ~145 GeV/c2(Run I/CDFCDF)

NLSP(LSP = G)

NLSPNLSP(LSP = (LSP = GG)) G

~

G~

p uup_

uu__

GMSB(selected scenarios)

~~ X

X~

X−X~−

June 18, 2002 SUSY 2002 33

GMSBGMSB

101

102

103

104

F1/2

(TeV)

10−6

10−5

10−4

10−3

10−2

10−1

100

101

102

103

cτ (

met

ers)X

X~

G~(NLSP)(LSP)

1/F1/2

eVTeV 100

423

2

⎟⎟⎠

⎞⎜⎜⎝

⎛≈=

FMFm

plG .~

Prompt decays

Missing ET

Displaced decays

250 G

eV100 G

eV

m X= 50

GeV

~

Λ = F/(CG Mm)Nm (# of Messengers)Mm (Messenger Mass)tanβ, sign(µ), CG ⎟

⎠⎞

⎜⎝⎛=

παΛ4

N mi

ii kM

Gaugino mass:

June 18, 2002 SUSY 2002 34

44.8 GeV

e1ET = 36 GeV γ2

ET = 30GeV

e CandidateET = 63 GeV

γ1ET = 36 GeV

eeγγETCandidate Event

ET = 55 GeV

NLSP = NLSP = χχ1100

χχ in γγ + ET + X/~~

~

1

10

10 2

200 225 250 275 300 325 350 375 400 425

Discovery reach (2fb-1)

95% CL limit (2fb-1)

95% CL limit (10fb-1)

95% CL limit (30fb-1)

σ x

BR

CDF projected limitsfrom diphotons, GMSB model

M(χ~±

1) (GeV)

Chargino Mass (GeV)

Λ (TeV)

Cro

ss S

ectio

n (f

b)

Theory

2 fb-1

5σ lines30 fb-1

DØ

Neutralino NLSP

150 200 250 300 350 400

60 80 100 120 140 160

1

10

10 2 DDØØ(5σ reach)

CDFCDFx

x

N=1, Mm/Λ=2, tanβ=2.5, µ>0F1/2 < a few TeV Prompt γF1/2 > a few 1000 TeV Displaced γ

340290γ20γ20ET50DDØØ330250γ14γ14ET40CDFCDF

30 fb−12 fb−1Selection5σreach

//

+

+

+x

Run-II GMSB WG Report, hep-ph/0008070

June 18, 2002 SUSY 2002 35

Stau Stau NLSP (I)NLSP (I)

Chargino Mass (GeV)

Λ (TeV)

Cro

ss S

ectio

n (f

b)

Theory

2 fb-1

30 fb-1

2 fb-1

30 fb-1

Stau NLSP

Short-lived NLSP

Quasi-stable NLSP

DØ

100 150 200 250 300 350 400 450

20 30 40 50 60 70 80 90 100

1

10

10 2

10 3

N=2, Mm/Λ=3, tanβ=15, µ>0

Prompt or shortPrompt or short--lived lived staustau::CDFCDF: τh30τh30ET30DDØØ : l15l5l5j20ET20 & LS l15l15+j20j20ET20QuasiQuasi--stable NLSPstable NLSPDDØØ : l50l50 (Mll>150) + (“µ”, large dE/dx)

/// 10

10 2

10 3

100 150 200 250 300

discovery reach (2fb-1)

95% CL limit (2fb-1)

95% CL limit (10fb-1)95% CL limit (30fb-1)

CDF projected limitsfrom prompt ditaus, GMSB model

Stau Mass

σ x

BR

(fb

)

+

+420 GeV/c2

230 GeV/c2

June 18, 2002 SUSY 2002 36

Stau Stau NLSP (II)NLSP (II)LongLong--lived lived staustau in in staustau++staustau production:production:CDFCDF: “µ” + X

with p > 35 GeV/cβγ < 0.85 ( dE/dx)Mstau > 60 GeV/c2

(via dE/dx, pT)

10-1

1

10

10 2

100 150 200 250 300

discovery reach (2fb -1)

95% CL limit (2fb -1)95% CL with T.O.F. (2fb -1

)95% CL limit (10fb -1

)

95% CL limit (30fb -1)

CDF projected limitsfrom CHAMPS, GMSB model

Stau Mass

σ x

BR

(fb

)

+

180 GeV/c2 (5σ@30fb−1)

With 2 fb-1,150-200 GeV/c2

at 95% CL limits.

June 18, 2002 SUSY 2002 37

Slepton Slepton CoCo--NLSPNLSP

χχ (l co-NLSP) in lll + j + ET

χχ (l co-NLSP) in ll + dE/dx

Chargino Mass (GeV)

Λ (TeV)

Cro

ss S

ectio

n (f

b)

Theory

2 fb-1

30 fb-1

2 fb-1

30 fb-1

Slepton Co-NLSP

Short-lived NLSP

Quasi-stable NLSP

DØ200 250 300 350 400 450 500

30 35 40 45 50 55 60 65 70

1

10

10 2

1

10

10 2

150 200 250 300 350 400 450 500 550

discovery reach (2fb-1)

95% CL limit reach (2fb-1)

95% CL limitreach (10fb-1)

95% CL limitreach (30fb-1)

χ~±

1 Mass

CDF projected limitsfrom trileptons, GMSB model

σ x

BR

(fb

)

CDFCDF

DDØØ(5σ reach)

+

x

x

Run-II GMSB WG Report, hep-ph/0008070

N=3, Mm/Λ=3, tanβ=3, µ>0

/~ ~~x+ ~ ~~

γcτ > 3 cm, l ~ “µ”~

+

480 GeV/c2

June 18, 2002 SUSY 2002 38

1) CDF, hep-ex/0110015 (86 pb−1)l25 + γ25 + ET25Nobs

eγ = 5 (3.4+0.3 expected)Nobs

µγ = 11 (4.2+0.5 expected)

2)

3) Prediction (2 fb−1):N(µγET) = 195 eventsN(γET) = 720 events

0

2

4

6

8

10

25 30 35 40 45 50 55 60 65 70E

vent

s/5

GeV

lepton ET (GeV)

∆σ=3.31

predictionobserved

background

ν ud

µ d

GG LSP + RLSP + RPP ViolationViolationB.C. Allanach, S. Lola, K. Sridhar,hep-ph/0111014

λ’211µ+∼

µ+

γ

u

d_

χ10 G~~

//

~

/

λ’211=0.01tanβ=10

e+µ131 GeV

87 GeV 10−3 eV

Br=0.984

Br=0.975

Bs µ+µ−BBss µµ++µµ−−

p uup_

uu__

µ+µ−

Bs

B

µ

µ

Z0

b

s

_

W +t

t

_

mSUGRAGMSBAMSB

Rp Violation

µ

µ

h/A0

b

s

_

χ +~

t~

tan6β

June 18, 2002 SUSY 2002 40

BBss µµµµ : SM/SUSY FCNC: SM/SUSY FCNC

µ

µ

Z0

b

s

_

W +t

t

_

µ

µ

h/A0

b

s

_

χ +~

t~

tan6β

b

FCNC loopSM (3-4 x 10−9) + SUSY + Higgs

(large tanβ and small m0)We use the Run-I data for an extrapolation.

June 18, 2002 SUSY 2002 41

CDF, PRD 57 (1998) 3811CDF, PRD 57 (1998) 3811Lum = 98 pb−1

Bd: 5.205-5.355 GeV/c2

Bs: 5.300-5.450 GeV/c2

Nobs = 1 with 5.344 GeV/c2

Br(Bd µµ ) < 8.6x10−7 (95% C.L.)Br(Bs µµ ) < 2.6x10−6 (95% C.L.)

DDØØ, PLB 423 (1998) 419PLB 423 (1998) 419Lum = 50 pb−1

Bd/s: 4.8-5.8 GeV/c2

Nobs = 15 where NBG = 15+2Br(Bd/s µµ ) < 4.0x10−5 (90% C.L.)

BBdd((ss)) µµµµ : Run I Review: Run I ReviewCDFCDF

We use the CDF Run-I data for an extrapolation.

June 18, 2002 SUSY 2002 42

Review of the CDF Analysis:Review of the CDF Analysis:Primary Cuts:a. PT

µµ > 6 GeV/cb. cτ = Lxy MB / PT

µµ

> 100 µm

c. Iso = PTµµ / [PT

µµ + Σ PTtrk ]

> 0.75 (∆R < 1 and |ztrk-zvtx| < 5 cm)

d. ∆φ = ∆φ(PTµµ , PT

vtx ) < 0.1 rad

PTµµ

PTµ PT

µ

PTvtx

∆φ

x

y

BBss µµµµ : Run I Cuts (CDF): Run I Cuts (CDF)

ε1~0.45 & R1~450 for a baseline sample

June 18, 2002 SUSY 2002 43

Primary Cuts (Plan):Primary Cuts (Plan):a. PT

µµ > 6 GeV/cb. Lxy > 400 µm

with d/σd > 2 for both tracksR2/R1≅120, ε2/ε1≅0.5 (Run I)

c. Iso > 0.8(∆R < 1 and |ztrk-zvtx| < 5 cmfor tracks w/ d/σd > 2)

d. ∆φ = ∆φ(Pµµ , Pvtx ) < 0.1 rad∆θ r-z < 0.1 rad

e. B in away side

PTµµ

PTµ PT

µ

PTvtx

∆θ r-z &

x

y∆φ

BBss µµµµ : Run II Cuts: Run II CutsTwo major BG sources1) Fake2) Gluon-splitting (g bb µµ)

Two major BG sourcesTwo major BG sources1) Fake2) Gluon-splitting (g bb µµ)

June 18, 2002 SUSY 2002 44

Run I:Run I: ε1~0.45 & R1~450 for a baseline sampleNBG ~ 1 event

Run II:Run II:We assume “ε2=0.45x0.45 & R2=450x450” is possible.a. Scaling: R2 = 450 ^ (0.45/ε2)

ε2/ε1 = 1 / [1 + log(R2/R1)/log(450)]

b. NBG (Run I cuts)~ 57 @ 2 fb−1 R2/R1 = 57 ε2/ε1 ~ 0.60NBG (Run I cuts) ~ 429 @ 15 fb−1 R2/R1 = 429 ε2/ε1 ~ 0.50

c. Scaling down using Br(Bs µµ ) < 2.6x10−6 (with one event)

BrRun II = BrRun I / [ (Lum/98pb−1) x 2.8 x (ε2/ε1) ]

BBss µµµµ : Run II Projection: Run II Projection

AµµRun II = 2.8 x Aµµ

Run I

June 18, 2002 SUSY 2002 45

Run II Prospect: 95% CL LimitsRun II Prospect: 95% CL Limits

x

x

~8x10−8

~1.2x10−8

ε2/ε1 =1for comparison

BrRun II = BrRun I / [ (Lum/98pb−1) x 2.8 x (ε2/ε1) ]

R. Arnowitt, B. Dutta, T. Kamon, M. Tanaka, hep-ph/0203069, to appear in PLB

Lim

it on

Br(

Bs

µµ) a

t 95%

CL

x ~0.6x10−8 (CDF x 2##)## CDF ~ CDF ~ DDØØ

is assumed.is assumed.

BrBrSMSM

June 18, 2002 SUSY 2002 46

mSUGRAmSUGRA: : tantanββ vs. vs. mm1/21/2A. Dedes, H.K. Dreiner, U. Nierste., hep-ph/0108037, PRL 87 (2001) 251604

No REWSB, LEP χ1+ bound

No neutral LSP

10−8

8x10−8

Mg ~ 700 GeV/c2~

(δaµ)SUSY in 10−10

Br(Bs µµ)

Mh (115 & 120 GeV/c2)

Beyond the Tevatron reachvia direct searches

June 18, 2002 SUSY 2002 47

200

400

600

800

1000

200 400 600 800 1000m1/2[GeV]

m0[

GeV

]

A0=0, µ>0tanβ=50

b→sγ

114

GeV

117

GeV

120

GeV

Br[B

s →µ + µ −]=2×10 -8

1×10-87×10 -8

m χ0>m τ

aµ<11×10-10

dark matter allowed

200

400

600

800

1000

200 400 600 800 1000m1/2[GeV]

m0[

GeV

]

A0=0, µ>0tanβ=40

b→sγ

114

GeV

117

GeV

120

GeV

Br[B

s →µ + µ −]=1×10 -8

2×10 -8

7×10 -9

m χ0>m τ

aµ<11×10-10

dark matter allowed

mm00 vs. vs. mm1/2 1/2 ((AA00= 0)= 0)

CDM: χ10 = LSP

0.07 < ΩLSP h2 < 0.25~Snowmass Pt.4

A/H bb,ττ

R. Arnowitt et al., hep-ph/0203069, to appear in PLB

June 18, 2002 SUSY 2002 48

Testing SUSY MechanismTesting SUSY Mechanism

GMSB (Nm=1)S. Baek, P. Ko, W.-Y. Song,hep-ph/0205259

tanβ = 50-60tanβ = 40-50tanβ = 30-40tanβ = 20-30tanβ = 3-20

The Tevatron could exclude GMSB with tanβ < 40 and lower Nm if the Bs µµ decay is observed with Br > 10−8.

June 18, 2002 SUSY 2002 49

Testing SUSY MechanismTesting SUSY Mechanism

(GeV)1M50 100 150 200 250 300 350 400

βta

n

10

20

30

40

50

60

10

2642

115GeV

122GeV

120GeV

-95x10

-92.5x10

(GeV)0m100 200 300 400 500 600 700

βta

n

5

10

15

20

25

30

26 10

115GeV

119GeV

119.7GeV

119GeV42

-93x10

-85x10-81x10

GMSB (Nm=1,Mm=106 GeV)AMSB (Maux = 50 TeV)

S. Baek, P. Ko, W.-Y. Song,hep-ph/0205259

(δaµ)SUSY in 10−10

Br(Bs µµ)

Mh

No

neut

ral L

SP

b sγ

Mh(

LE

P) L

imit

June 18, 2002 SUSY 2002 50

Testing SUSY MechanismTesting SUSY MechanismS. Baek, P. Ko, W.-Y. Song,hep-ph/0205259

The Tevatron could exclude

a) GMSB with lower Nm

b) Minimal AMSB

if the Bs µµ decay is observed with Br > 10−8.

June 18, 2002 SUSY 2002 51

λ’i23 λ i22

ν∼

µ

µb

s

_

ν cb

l s

ν νµ

l µ

RRPP Violation: Violation: BrBr vs. vs. mm1/21/2R. Arnowitt et al.,hep-ph/0203069, to appear in PLB

e.g., WTRPV = λijkLiLjEk + λ’ijkLiQjDk + λ’’ijkUiDjDk

15 fb−1

2 fb−1

Summary: Prospects for SUSY Discovery at the Tevatron

Summary: Prospects for SUSY Summary: Prospects for SUSY Discovery at the Discovery at the TevatronTevatron

Run II (15 Run II (15 fbfb−−11) at the ) at the TevatronTevatronA unique opportunity in the coming 5+

years to hopefully penetrate the SUSY world in a crucial mass range.

τ’s and b’s: the keys for direct searches

The direct searches are limited by Luminosity and Ecm.

The Tevatron will deliver 230 pb−1 and both CDFCDF and DDØØ will take 100-150 pb−1 on tape by the end of 2002.

BBss µµ µµ in SUSYin SUSYA unique opportunity to penetrate the

SUSY world if tanβ is large…

Prospects (95% C.L. limits):2 fb−1 Br < 8 x 10−8

15 fb−1 Br < 1.2 x 10−8

e.g., mSUGRA reach @15 fb−1

m1/2 < 800 GeV @tanβ = 50(beyond the direct search at the Tevatron)

b_

s

µ

µ

h/A0