Prospects for. SUSY Discovery at the Tevatron. p _ X ~ X ~ _

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1 µ + Prospects for X SUSY Discovery at the Tevatron µ B s p u X _ u p _ B Teruki Kamon (Texas A&M University) for CDF and DØ Collaborations SUSY 2002 The 10 th International Conference on Supersymmetry and Unification of Fundamental Interactions DESY, Hamburg, Germany, June 17-23, 2002

2 Outline Motivation Tevatron Upgrades Luminosity Profile Luminosity Now Selected Topics Direct Searches SUSY in B s µµ Summary CDF and DØ Upgrades Improvements Trigger Rates June 18, 2002 SUSY

3 Motivation SUGRA GMSB AMSB gmsb R p or R/ p June 18, 2002 SUSY

4 Tevatron Ldt = 15 fb 1 CDF DØ N bunches s (TeV) typ L (cm 2 s 1 ) Run 1b Run 2a Run 2b 6x6 36x36 140x x x x10 32 Ldt (pb 1 /week) Bunch xing (ns) Interactions/xing June 18, 2002 SUSY

5 Why 15 fb 1? Tevatron (Run IIa/IIb) qq gg W(Z) h lν(νν) bb WW * * + /ZZ l l X x Run IIb Run IIa KEY: σ(m bb )/M bb improved by 30% Source: Higgs working group report (SUSY/Higgs Workshop, 1998) June 18, 2002 SUSY

6 Luminosity Profile Run IIa Run IIb Also see Dave McGinnis, Tevatron Collider Luminosity Upgrades, Joint Experiment Theoretical Physics Seminar, March 8, 2001 June 18, 2002 SUSY

7 Luminosity Now Peak Luminosity: 1.95x x x10 31 June 18, 2002 SUSY

8 CDF and DØD (Fermilab-Pub-96/390-E, Fermilab-Pub Pub-96/357-E) 1.0 δp T /p T 2 = δp T /p T2 = δp T /p T2 = (with SMT + fiber tracker) TOF Also new front-end, DAQ and trigger electronics for both detectors June 18, 2002 SUSY

9 CDF and DØD Upgrades CDF New front-end, DAQ and trigger electronics New silicon vertex (SVX) detector New central tracker drift chamber New scintillation-tile end-plug EM and HAD calorimeters Increased η-φ coverage for muon detector New time-of-flight (TOF) system η range CDF DØ e trig e µ trig 1.2(1.5) 1.7 DØ New front-end, DAQ, and trigger electronics New silicon micro-strip tracker (SMT) New scintillation-fiber tracking system New 2T solenoid magnet New preshower detector added to the existing calorimetry New muon system µ τ h trig June 18, 2002 SUSY τ h j b c

10 CDF and DØD Improvements CDF p: δp T /p 2 T = for 1 < η < 2 (with SVX) [Still δp T /p T2 = for η < 1] e: η coverage, 33% up for tt µ: η coverage, 12% up for tt (30% up for W) η trig : to 1.2(1.5) at the beginning (later) of Run II τ: ID in 1 < η < 2 b: Increase ε b (SVX) 2 for tt by 62% SVX trigger (SVT) at Level 2 DØ p: δp T /p 2 T = (with SMT + fiber tracker) e: Add an inclusive e trigger with E T > 7 GeV µ: Trigger/ID: p T > 1.5 GeV/c (from 4 GeV/c) High p T resolution, improved by a factor of 2 τ: ε ID 40% (from 13%) b: ε b (SMT) 50% for t Wb SMT trigger (STT) at Level 2 June 18, 2002 SUSY

11 CDF and DØD Trigger Rates CDF 11 MHz 7 MHz DØ Level 1 45 khz Level Hz Level 3 75 Hz Offline L = 2x10 32 cm 2 s 1 Balance the trigger budget between QCD-Bottom-EW- Top-Higgs-Others Level 1 5 khz Level Hz Level 3 50 Hz Offline June 18, 2002 SUSY

12 History/Herstory Herstory of Prospect TeV2000 Report (Fermilab-Pub-96/082), Section 6 SUSY Physics a) Based on MSSM or msugra b) Experimental signatures Trilepton (χ 1+ χ 20 ) E T + jets (g and q) / / / E T + cc (t 1 cχ 10 ) E T + bb (t 1 bχ 1+ ) Proceedings of Run-II SUSY/Higgs Workshops (May & Nov. 1998) hep-ph/ (SUGRA) hep-ph/ (GMSB) hep-ph/ (BTMSSM) hep-ph/ (Higgs) Trigger/ID for b,τ, low E/ T, and γ (pointing back, timing): key in success

13 Alternative to Inclusive E T, Jet, Lepton Triggers for Higher Luminosity / / Low E T (25)+J(10)+J(10) Trigger High mass gluino search with the canonical E/ T +jets signature much more efficient with lower / / E T threshold Lower E T threshold at Level 2 will drive the stop and sbottom analyses OK (80%) for W( lν, τν)+jets OK efficiency (60%) for top OK efficiency for Higgs 56% for W( jj)h 125 ( ττ) 72% for Z( νν)h 140 ( bb) Reliable parametrization of QCD / high E T tails to reduce the systematic uncertainty Two b s Trigger w/ SVT H( bb) + X Calibration: Z( bb) + X Lepton(8) + Track(5) Trigger ττ( lτ h ) final state as well as ll e.g., χ 1+ ( τνχ 10 )χ 20 ( ττχ 10 ) bb+a( ττ) Caliblation: Z ττ( lτ h ) Source: SUGRA working group report (SUSY/Higgs Workshop, 1998) June 18, 2002 SUSY

14 Trigger for ττ + X Many interesting di-τ final states in SUSY and Higgs: 1) lττ and τττ are dominant final states in chargino-neutralino production at large tanβ of SUGRA 2) t 1 bτν in msugra 3) Stau NLSP in GMSB 4) t 1 τb in R p violation (λ 333 ) 5) h/a ττ 6) bb+a( ττ) or b+a( ττ) Experimental challenge: Trigger (and ID) for relatively low P T τ leptons for higher luminosity Lepton+track trigger is promising, compared to Di-τ h trigger and E T +τ h trigger (including W τ ν) Events / 5 GeV Events Events / 5 GeV / 10 deg. E June 18, 2002 SUSY 2002 T M(e,τ h ) / φ(e,e T ) CDF Preliminary (106 pb -1 ) OS data Z ττ +QCD +W( lν)+jet +Diboson+top p Tl > 10 GeV/c 30 Run I e+τ h E T (e) Events / 5 GeV/c τ 6 Events Events / 5 GeV/c / 10 2 deg. Z analysis Z p T τ h > 15 GeV/c τ p T (τ h ) φ(e,τ150 h ) Analysis Events e +τ h CDF Preliminary (106 pb -1 ) OS data Z ττ(mc) +LS Data Number of charged tracks in τ cone

15 Prospects including new ideas Higgs and beyond

16 Squarks/Gluinos q p u u p _ msugra/mssm q _

17 χ ± 1 `±Λ `± χ 0 2 `±Λ ` `± jets (ie, g! bb) b top quarks (g! tt) even Signatures for g/q Cleaner, but small Br Experimental Signatures a) E/ T + jets + 0 lepton b) E/ T + jets + 1 lepton c) (Like-sign) dilepton d) M l > M large tanβ τ χ 0 χ 0 Cascade decays: q g q q 1 q g q q q q q W q Z q q g g q q q q 0 1 ` 0 1 ` W Z 0 `; many possible signatures:leptons, jets, 6 ET ν June 18, 2002 SUSY χ ± 1! `±ν χ 0 χ 0 2! `+` χ 0

18 / g/q: : Jets + E T + 0 Lepton CDF, PRL 88 (2002) N j15 > 3, φ min (j,e/ T ) > 0.5 rad (28.6 o ) N iso trk10 = 0, E j 1 T > 70, ET j 2 > 30 GeV E/ T > 70, H T =E/ T +E j 2+ET j 3 T > 150 GeV N obs =74, N BG(QCD,tt,W/Z) = Run I 84 pb A x Blind Search m q (GeV/c 2 ) q=u,d,s,c,b µ<0 msugra CDF 97 m q =m g This analysis LEP I m g (GeV/c 2 ) tanβ = 3 q=u,d,s,c µ=-800 GeV/c 2 MSSM B C D m q < m 0 χ Final E/ T and H T cuts are optimized for each box. (e.g., E T >110, H T >230 in B) D 1 V. Krutelyov et al., PLB 505 (2001) 161 N j15 > 4, φ min (j,e/ T ) > 30 o N l15 = 0 E / T > 100, E/ T +E j 1+ET j 2 T > 350 GeV Run II 15 fb June 18, 2002 / SUSY M g [GeV] Significance N BG = 73 fb 300 GeV/c GeV/c 2 Insensitive to tanβ msugra Tevatron µ > 0, jets A 0 + = E/ 0 T M g M q tanβ =3, 10,

19 / g/q: : Jets + E T + 1 Lepton DØ, hep-ex/ , to PRD N j15 > 4 N e20 = 1 E/ T > 25, Neural Net (NN) Analysis N obs =72, N BG(W+4j,QCD,tt,W+2j) = Run I m 1/2 (GeV) tanβ = 3, µ < D dilepton 93 pb 1 PRD 63 (2001) (R) Neural Net LEP I A 0 = 0 D single electron V. Krutelyov et al., PLB 505 (2001) 161 N j15 > 2, φ min (j,e/ T ) > 30 o N l15 = 1, M lν T < 50 or >110 GeV/c 2 E / T > 40, E/ T +E j 1+ET j 2 T > 350 GeV Run II 15 fb 1 m 0 (GeV) June 18, 2002 SUSY 2002 m19 0 [GeV] Significance N BG = 70 fb 1 m 1/2 = 160 GeV (M g 420 GeV/c 2 ) Sensitive to tanβ msugra µ > 0, A Tevatron 0 = 0 m 1/2 l + = jets GeV E/ T tanβ =3, 10,

20 Limits on M g in Jets + E T / 1. DØ, PRL 75(1995) CDF, PRD 56(1997) DØ, PRL 83(1999) CDF, PRL 88(2002) Low tanβ µ < 0 5σ reaches 5. S. Mrenna et al., PRD 53 (1996) 1168 using PYTHIA with a toy detector simulation 6. V. Krutelyov et al., PLB 505 (2001) 161 tanβ = 3, 10, 30 & µ > 0 using ISAJET v7.48 with SHW detector simulation They are consistent with many other papers such as H. Baer et al.,.. 95% C.L. All SUSY processes June 18, 2002 SUSY

21 Chargino-Neutralino χ + 1 p u u p _ msugra χ 0 2

22 / 3 Leptons + E T Trilepton plus missing E T from chargino-neutralino production is one of the most cleanest (promising) signatures in hadron colliders. χ 0 χ ± 1 W Λ ν `± χ χ Λ Z `+ ` Run I: Searched for clean trilepton final state (eee, eeµ, eµµ, µµµ) with low p T (e.g, 11, 5, 5 GeV/c). CDF: PRL 80 (1998) 1591 N obs = 0 ( expected) DØ : PRL 80 (1998) 5275 N obs = 0 ( expected) χ ± 1 `±Λ ν χ 0 `± χ 0 2 `±Λ ` χ 0 `± Within MSSM/mSUGRA, the maximum reach on the chargino mass was up to about 70 GeV/c 2 for small tanβ scenario (e.g., tanβ = 2) with lighter slepton mass. χ ± 1! `±ν χ 0 χ 0 2! `+` χ 0 June 18, 2002 SUSY

23 3 Leptons + E T V. Barger and C. Kao, hep-ph/ , PRD 60 (1999) τ 1 could be lighter for large tanβ and small m 0 Strong tanβ Dependence / Large tanβ lττ and τττ are dominant final states from chargino-neutralino production. To maximize the reach, low p T Lepton(e/µ)+track trigger is crucial to detect hadronically decaying tau lepton (τ h ). χ 0 2 τ τ τ χ 0 1 June 18, 2002 SUSY

24 / 3 Leptons + E T 1) Look for clean trilepton final state ( eee, eeµ, e µµ, µµµ) with p T (l 1,l 2,l 3 )>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/ , PRD 60 (1999) [the SM background calculations including effects from W*, Z* and γ* are substantially improved.] 2) Also accept τ h H. Baer et al., hep-ph/ PRD 58 (1998) J. Lykken and K. Matchev, hep-ph/ PRD 60 (2000) K. Matchev and D. Pierce, hep-ph/ PRD 60 (1999) lll and LS ll+τ h final states are the best channels for the study of chargenoneutralino production. June 18, 2002 SUSY

25 / 3 Leptons + E T K. Matchev and D. Pierce, hep-ph/ , PRD 60 (1999) Dashed curves 3σ reaches w/ standard cuts p T (l 1,l 2,l 3 )>11,7,5 GeV/c; E/ T >25 GeV; M l +l cuts Solid curves - 3σ reaches w/ optimized cuts 11,7,5;25;70 for small m 0 ; 11,11,11;15;70 for large m 0 LEP LEP 30 fb 1 10 fb 1 2 fb 1 Similar reach via llτ h No reach via llτ h June 18, 2002 SUSY

26 Stop/Sbottom Sbottom t p u u p _ msugra/mssm t _

27 Stop The lightest stop, t 1, is a very good candidate for studying at the Tevatron: a) Experimentally, larger cross section compared to that for sleptons A 0 = 1342 A 0 = 671 A 0 = 0 R. Demina et al., hep-ph/ , PRD 62 (2000) msugra µ > 0 m 1/2 = 300 GeV m 0 = 300 GeV Too light or tachyonic b) Theoretically, lighter stop mass preferred for larger tanβ & A 0 M h < 115 GeV/c 2 M h < 95 GeV/c 2 June 18, 2002 SUSY

28 Stop/Sbottom Sbottom Decays (a) t 1 χ 1 + (b) b (d) b W χ 1 0 (c) l,τ t 1 ν χ 1 +* b b τ ν (e) b 1 (f) b χ 0 1 c t 1 χ 1 +* l,τ ν t 1 χ 1 +* W χ 1 0 t 1 b χ +* 1 W * χ 0 1 June 18, 2002 SUSY

29 R. Demina et al., hep-ph/ , PRD 62 (2000) Stop M(χ ),Gev/c E CM =2.0 TeV LEP χ 1 + limit M t > M χ1 + l 10 +b 12 +j 8 +E T25 σ BG(W+jets,top,QCD,..) = 980 fb t1 b χ + 1 M(t 1 )=M(b)+M(χ 1 + ) / l + 8+l 5+j 15 +E/ T30 Br(t 1 bχ 1+ )=1 Br(χ 1+ lνχ 10 )=0.22 L=20 fb -1 p T or E T cuts M(ν ),Gev/c 2 M l < M t < M χ1 + (m 0 <0.55 m 1/2 in msugra) σ BG(QCD,Z/γ*+jets,top,..) = 50 fb E CM =2.0 TeV M(t 1 )=M(b)+M(l)+M(ν ) 1 t b l ν Br(t 1 blν or blν)=2/3 L=20 fb -1 L=4 fb -1 L=2 fb GeV/c 2 (Run IIa) L=4 fb -1 L=2 fb -1 LEP ν limit M(t 1 ),Gev/c2 M(t 1 ),Gev/c2 144 GeV/c 2 (Run I/DØ) June 18, 2002 SUSY

30 R. Demina et al., hep-ph/ , PRD 62 (2000) Stop t 1 χ 1 +* b τ ν τ channel sensitivity to be checked M(ν ),Gev/c 2 M τ < M t < M χ1 + (m 0 < 5 m 1/2, large tanβ in msugra) l 10 +τ h15 +j 15 +j 15 +E/ Txx E CM =2.0 TeV Br(t 1 bτν )=1 M(t 1 )=M(b)+M(l)+M(ν ) 1 t b l ν L=20 fb -1 L=4 fb -1 L=2 fb -1 LEP ν limit M(t 1 ),Gev/c2 June 18, 2002 SUSY

31 R. Demina et al., hep-ph/ , PRD 62 (2000) Stop/Sbottom Sbottom M t > M χ1 0 c 15 +j 15 (+j 15 )+E/ T40 σ BG(W+jets,QCD,..) = 160 fb t1 c χ 1 0 or t1 b W χ 1 0 l 10 +b 12 +j 8 +E/ T25 σ BG(W+jets,top,QCD,..) = 980 fb M b > M χ1 0 b 15 +j 15 (+j 15 )+E/ T40 b 1 b χ 0 1 M(χ 1 0 ),Gev/c 2 E CM =2.0 TeV 0 ) M(t 1 )=M(c)+M(χ 1 0 ) M(t 1 )=M(b)+M(W)+M(χ 1 L=4 fb -1 L=2 fb -1 L=20 fb -1 0 ) M(t 1 )=M(t)+M(χ 1 LEP χ 1 0 limit SUGRA (non-universal scalar mass) tanβ > 20 & µ < 0 M(χ 0 1 ),Gev/c 2 E CM =2.0 TeV M(b 1 )=M(b)+M(χ 1 0 ) LEP χ 0 1 limit L=20 fb -1 L=4 fb -1 L=2 fb -1 M(t 1 ),Gev/c2 115 GeV/c 2 (Run I/CDF) 145 GeV/c 2 msugra M(b 1 ),Gev/c2 June 18, 2002 SUSY

32 NLSP X (LSP = G) G p u X u p _ X X GMSB (selected scenarios) G

33 GMSB F F m = 2. 4 G 3M 100 TeV pl 1/F 1/2 X X G (NLSP) 2 (LSP) Λ = F/(C G M m ) N m (# of Messengers) M m (Messenger Mass) tanβ, sign(µ), C G ev cτ (meters) Missing E T Displaced decays Prompt decays F 1/2 Gaugino mass: M i = k i N m (TeV) 100 GeV 250 GeV m X = 50 GeV αi Λ 4 π June 18, 2002 SUSY

34 eeγγe T Candidate Event e 1 E T = 36 GeV γ2 E T = 30 GeV e Candidate E T = 63 GeV 44.8 GeV NLSP = χ x CDF projected limits from diphotons, GMSB model Discovery reach (2fb -1 ) 10 γ 1 E T = 36 GeV E T = 55 GeV σ x BR 95% CL limit (10fb -1 ) 95% CL limit (2fb -1 ) + Run-II GMSB WG Report, hep-ph/ χχ in γγ + E/ T + X N=1, M m /Λ=2, tanβ=2.5, µ>0 F 1/2 < a few TeV Prompt γ F 1/2 > a few 1000 TeV Displaced γ 5σ reach CDF DØ Selection / / γ 14 γ 14 E T40 γ 20 γ 20 E T50 2 fb 1 x fb June 18, 2002 SUSY 2002 Chargino Mass (GeV) 34 Cross Section (fb) 10 1 DØ 1 95% CL limit (30fb -1 ) M(χ ± 1 ) (GeV) Theory 5σ lines Λ (TeV) DØ Neutralino NLSP (5σ reach) x 2 fb fb

35 Stau NLSP (I) 10 3 CDF projected limits from prompt ditaus, GMSB model discovery reach (2fb -1 ) Prompt or short-lived stau: CDF: τ h30 τ h30 E T30 DØ : l 15 l 5 l 5 j 20 E T20 & LS l 15 l 15 +j 20 j 20 E/ T20 Quasi-stable stable NLSP DØ : l 50 l 50 (M ll >150) + ( µ, large de/dx) / / 10 σ x BR (fb) % CL limit (2fb -1 ) 95% CL limit (10fb -1 ) 95% CL limit (30fb -1 ) Stau Mass N=2, M m /Λ=3, tanβ=15, µ>0 Λ (TeV) Stau NLSP June 18, 2002 SUSY 2002 Chargino Mass (GeV) 35 Cross Section (fb) DØ Theory 230 GeV/c fb -1 Quasi-stable NLSP 30 fb -1 2 fb -1 Short-lived NLSP 30 fb GeV/c

36 Stau NLSP (II) Long-lived stau in stau+stau production: CDF: µ + X with p > 35 GeV/c βγ < 0.85 ( de/dx) 10 2 M stau > 60 GeV/c 2 (via de/dx, p T ) With 2 fb -1, GeV/c 2 at 95% CL limits. σ x BR (fb) CDF projected limits from CHAMPS, GMSB model + 95% CL limit (30fb -1 ) discovery reach (2fb -1 ) 95% CL limit (2fb -1 ) 95% CL with T.O.F. (2fb -1 ) 95% CL limit (10fb -1 ) Stau Mass 180 GeV/c 2 (5σ@30fb 1 ) June 18, 2002 SUSY

37 Slepton Co-NLSP Run-II GMSB WG Report, hep-ph/ x χχ (l co-nlsp) in lll + j + E/ T + χχ (l co-nlsp) in ll + de/dx γcτ > 3 cm, l µ N=3, M m /Λ=3, tanβ=3, µ>0 Λ (TeV) Chargino Mass (GeV) June 18, 2002 SUSY CDF σ x BR (fb) 10 DØ 1 (5σ reach) χ ± 1 Mass Cross Section (fb) DØ CDF projected limits from trileptons, GMSB model x Theory x discovery reach (2fb -1 ) 95% CL limit reach (2fb -1 ) Quasi-stable NLSP 95% CL limit reach (10fb -1 ) 95% CL limit reach (30fb -1 ) Slepton Co-NLSP 30 fb -1 2 fb -1 Short-lived NLSP + 30 fb -1 2 fb GeV/c 2

38 G LSP + R P Violation B.C. Allanach, S. Lola, K. Sridhar, hep-ph/ u λ µ d _ 131 GeV χ 1 0 Br=0.975 µ + γ 87 GeV 10 3 ev Br=0.984 G 1) CDF, hep-ex/ (86 pb 1 ) l 25 + γ 25 + E/ T25 N eγ obs = 5 ( expected) N µγ obs = 11 ( expected) 2) Events/5 GeV e+µ prediction observed background σ=3.31 ν u µ d d λ 211 =0.01 tanβ= lepton E T (GeV) 3) Prediction (2 fb 1 ): N(µγE/ T ) = 195 events N(γE T ) = 720 events June 18, 2002 SUSY /

39 _ b s χ + t tan 6 β h/a 0 p µ B s µ + µ µ + µ µ Bs u u _ b s W + p t t Z 0 µ µ B msugra GMSB AMSB R p Violation

40 B s µµ : SM/SUSY FCNC _ b s W + _ t t Z 0 µ µ _ b χ + h/a 0 June 18, 2002 SUSY t b tan 6 β µ µ s FCNC loop SM (3-4 x 10 9 ) + SUSY + Higgs (large tanβ and small m 0 ) We use the Run-I data for an extrapolation.

41 B d(s) µµ : Run I Review CDF, PRD 57 (1998) 3811 Lum = 98 pb 1 B d : GeV/c 2 B s : GeV/c 2 CDF N obs = 1 with GeV/c 2 Br(B d µµ ) < 8.6x10 7 (95% C.L.) Br(B s µµ ) < 2.6x10 6 (95% C.L.) DØ, PLB 423 (1998) 419 Lum = 50 pb 1 B d/s : GeV/c 2 N obs = 15 where N BG = 15+2 Br(B d/s µµ ) < 4.0x10 5 (90% C.L.) We use the CDF Run-I data for an extrapolation. June 18, 2002 SUSY

42 B s µµ : Run I Cuts (CDF) Review of the CDF Analysis: Primary Cuts: a. P µµ T > 6 GeV/c b. cτ = L xy M B / P µµ T > 100 µm c. Iso = P T µµ / [P T µµ + Σ P T trk ] > 0.75 ( R < 1 and z trk -z vtx < 5 cm) d. φ = φ(p T µµ, P T vtx ) < 0.1 rad P T µµ φ P µ T P µ y T P T vtx x ε & R for a baseline sample June 18, 2002 SUSY

43 B s µµ P T µµ µµ : Run II Cuts Two major BG sources 1) 1) Fake 2) 2) Gluon-splitting (g bb µµ) Primary Cuts (Plan): a. P µµ T > 6 GeV/c b. L xy > 400 µm with d/σ d > 2 for both tracks R 2 /R 1 120, ε 2 /ε (Run I) c. Iso > 0.8 ( R < 1 and z trk -z vtx < 5 cm for tracks w/ d/σ d > 2) d. φ = φ(p µµ, P vtx ) < 0.1 rad θ r-z < 0.1 rad e. B in away side θ r-z & P µ T φ y P µ T P T vtx June 18, 2002 SUSY x

44 B s µµ : Run II Projection Run I: ε & R for a baseline sample N BG 1 event Run II:We assume ε 2 =0.45x0.45 & R 2 =450x450 is possible. a. Scaling: R 2 = 450 ^ (0.45/ε 2 ) ε 2 /ε 1 = 1 / [1 + log(r 2 /R 1 )/log(450)] b. N BG (Run I cuts) 2 fb 1 R 2 /R 1 = 57 ε 2 /ε N BG (Run I cuts) 15 fb 1 R 2 /R 1 = 429 ε 2 /ε c. Scaling down using Br(B s µµ ) < 2.6x10 6 (with one event) A Run II µµ = 2.8 x A Run I µµ Br Run II = Br Run I / [ (Lum/98pb 1 ) x 2.8 x (ε 2 /ε 1 ) ] June 18, 2002 SUSY

45 Run II Prospect: 95% CL Limits Limit on Br(B s µµ ) at 95% CL x 8x10 8 Br SM Br Run II = Br Run I / [ (Lum/98pb 1 ) x 2.8 x (ε 2 /ε 1 ) ] x 1.2x10 8 R. Arnowitt, B. Dutta, T. Kamon, M. Tanaka, hep-ph/ , to appear in PLB ε 2 /ε 1 =1 for comparison x 0.6x10 8 (CDF x 2 # ) # CDF DØ is assumed. June 18, 2002 SUSY

46 msugra: tanβ vs. m1/2 A. Dedes, H.K. Dreiner, U. Nierste., hep-ph/ , PRL 87 (2001) No REWSB, LEP χ 1+ bound No neutral LSP M h (115 & 120 GeV/c 2 ) (δa µ ) SUSY in Br(B s µµ) 8x10 8 Beyond the Tevatron reach via direct searches 10 8 M g 700 GeV/c 2 June 18, 2002 SUSY

47 m 0 vs. m 1/2 (A 0= = 0) R. Arnowitt et al., hep-ph/ , to appear in PLB 1000 A 0 =0, µ>0 tanβ= A 0 =0, µ>0 tanβ= m0 [GeV] 114 GeV 117 GeV GeV Br[B s µ + µ ]= b sγ a µ < dark matter allowed m χ 0 >m τ m 1/2 [GeV] June 18, 2002 SUSY m0 [GeV] 114 GeV 117 GeV 120 GeV Br[B s µ + µ ]= b sγ a µ < m χ 0 >m τ dark matter allowed Snowmass Pt.4 A/H bb,ττ CDM: χ 0 1 = LSP 0.07 < Ω LSP h 2 < m 1/2 [GeV]

48 Testing SUSY Mechanism S. Baek, P. Ko, W.-Y. Song, hep-ph/ tanβ = tanβ = tanβ = tanβ = tanβ = 3-20 GMSB (N m =1) The Tevatron could exclude GMSB with tanβ < 40 and lower N m if the B s µµ decay is observed with Br > June 18, 2002 SUSY

49 Testing SUSY Mechanism tanβ S. Baek, P. Ko, W.-Y. Song, hep-ph/ b sγ AMSB (M aux = 50 TeV) No neutral LSP -8 5x x GeV -9 3x GeV GeV 115GeV M h (δa µ ) SUSY in Br(B s µµ) tanβ GMSB (N m =1,M m =10 6 GeV) M h (LEP) Limit GeV x x10 120GeV 122GeV m 0 (GeV) M 1 (GeV) June 18, 2002 SUSY

50 Testing SUSY Mechanism S. Baek, P. Ko, W.-Y. Song, hep-ph/ The Tevatron could exclude a) GMSB with lower N m b) Minimal AMSB if the B s µµ decay is observed with Br > June 18, 2002 SUSY

51 R P Violation: Br vs. m1/2 R. Arnowitt et al., hep-ph/ , to appear in PLB _ b e.g., W TRPV = ν λ i23 λ i22 µ λ ijk L i L j E k + λ ijk L i Q j D k + λ ijk U i D j D k s µ 2 fb 1 ν l c s b ν ν l µ µ 15 fb 1 June 18, 2002 SUSY

52 Summary: Prospects for SUSY Discovery at the Tevatron Run II (15 fb 1 ) at the Tevatron A 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 E cm. The Tevatron will deliver 230 pb 1 and both CDF and DØ will take pb 1 on tape by the end of B s µµ in SUSY A unique opportunity to penetrate the SUSY world if tanβ is large _ b s h/a 0 µ µ Prospects (95% C.L. limits): 2 fb 1 Br < 8 x fb 1 Br < 1.2 x 10 8 e.g., msugra fb 1 m 1/2 < 800 = 50 (beyond the direct search at the Tevatron)