Search For New Physics at the TeVatron Jean-François Grivaz LAL-Orsay http://www-cdf.fnal.gov/physics/exotic/exotic.html http://www-d0.fnal.gov/Run2Physics/WWW/results.htm J.-F. Grivaz Euro-GDR 25-November-2004

The Tevatron at Run II New Main Injector + Recycler Higher energy Chicago  Tevatron Main Injector & Recycler DØ CDF p source New Main Injector + Recycler Higher energy (1.96 TeV vs 1.8 TeV) => Higher cross sections (~30% for the top) Higher antiproton intensity 6x6  36x36 bunches (3.5 s  396 ns) antiproton “recycler” => Higher luminosity J.-F. Grivaz Euro-GDR 25-November-2004

Luminosity performance Peak luminosity: 4 - 8 1031 cm-2 s-1 Weekly delivered: 8 - 16 pb-1 Data taking efficiency: 80 - 90% Physics quality data: up to 350 pb-1 analyzed as of ICHEP04 1032 J.-F. Grivaz Euro-GDR 25-November-2004

Searches for New Phenomena Supersymmetry: (m)SUGRA, GMSB Extra Dimensions: large, warped Extended Gauge Theories: Z’ Higgs bosons: SUSY, SM In back-up slides: RPV, leptoquarks, excited leptons, doubly-charged Higgses Not covered : TeV–1 ED, Technicolor, Little Higgs but same signatures as e.g., LED, SM-Higgs, RS-gravitons Real exotics (e.g. monopoles) J.-F. Grivaz Euro-GDR 25-November-2004

Supersymmetry J.-F. Grivaz Euro-GDR 25-November-2004

(m)SUGRA m0 m1/2 tan() A0 sign() Two main search streams at the Tevatron: Squarks and gluinos  multijets + missing ET large production cross sections large experimental backgrounds Electroweak gauginos with leptonic decays (Trileptons) low production cross sections typically low leptonic branching ratios clean experimental signature J.-F. Grivaz Euro-GDR 25-November-2004

Trileptons (I) Arise from chargino-neutralino associated production “Golden” SUSY signature but: - low cross sections ( BR) - soft leptons - taus (at large tan) Needs large integrated luminosity Combine various final states (Also decays via W/Z exchange) DØ analysis based on 147  249 pb1 Combines eel, el, l and same sign dimuon final states Addresses “just beyond LEP” mSUGRA with low mass sleptons J.-F. Grivaz Euro-GDR 25-November-2004

Trileptons (II) Two isolated (rather soft) e or  Require some Missing ET  channel-dependent cuts (e.g. anti Z) Two same sign muons, or An isolated third track (no e or  ID) Main backgrounds: WW, WZ, W, a bit of bb Altogether: 3 events observed vs 2.9  0.8 expected J.-F. Grivaz Euro-GDR 25-November-2004

Trileptons (III) Substantial improvement wrt Run I: m()  97 GeV for m(slepton)  m() Should soon probe virgin mSUGRA territory J.-F. Grivaz Euro-GDR 25-November-2004

Stop and sbottom CDF has searched for charged massive particles in 53 pb1 appear as slow moving (TOF) high pT muons result interpreted for (meta)stable stop  m(stop) 108 GeV (isolated) or 95 GeV (non-isolated) CDF has searched for sbottoms in gluino decays (156 pb1) assumes sb1 much lighter than all other squarks (large tan) gluino  sb1 b  4 b-jets + Missing ET for gluino pairs the selection requires at least one b-tag, no isolated lepton With 2 b-tags: 4 vs 2.6  0.7 expected J.-F. Grivaz Euro-GDR 25-November-2004

“minimum sq-mass line” Generic squarks (I) Strong production of: sq-sqbar sq-sq sq-gl gl-gl In 85 pb1, DØ has searched along the “minimum sq-mass line” of mSUGRA: very low m0 (25 GeV), (tan = 3, A0 = 0,   0), scan over m1/2  Mostly sq-sqbar with sq  q   Acoplanar jets + Missing ET J.-F. Grivaz Euro-GDR 25-November-2004

Generic squarks (II) Main selection cuts: at least two high pT jets QCD Main selection cuts: at least two high pT jets isolated lepton veto Missing ET should not be along or opposite to a jet Sum of jet pT  275 GeV Missing ET  175 GeV Main backgrounds left: (Z  ) + jets (W ) + jets QCD negligible 4 events selected vs 2.7 +2.3/1.5 expected J.-F. Grivaz Euro-GDR 25-November-2004

Generic squarks (III) Slight improvement over CDF-Run I along that “minimum sq-mass line”: (msq  292 GeV and mgl  333 GeV) How relevant are the Tevatron results on squarks and gluinos ? LEP slepton and chargino limits  much tighter constraints on m0 and m1/2 within mSUGRA (or even MSSM with unification) The Tevatron should consider models with smaller M3/M2 ratios: not unnatural in GUTs (e.g. M3/M2 ~ 1 if SUSY breaking by a 75) or in some string inspired models J.-F. Grivaz Euro-GDR 25-November-2004

 Inclusive search for   Missing ET GMSB with  NLSP (I) Remember the CDF ee + Missing ET event ?…  + gravitino  Inclusive search for   Missing ET by both CDF / DØ Photon = electron without track Photon ET  13 / 20 GeV Missing ET > 45 / 40 GeV Mild topological cuts Main backgrounds: EM-jets (or real QCD photons) + fake Missing ET electron + photon + real Missing ET All determined from the data CDF : 0 vs 0.3  0.1 expected DØ : 2 vs 3.7  0.6 expected J.-F. Grivaz Euro-GDR 25-November-2004

GMSB with  NLSP (II) Interpretation within mGMSB 263 pb-1 with: N = 1 Mmessenger = 2,   0, tan = 15 (aka “Snowmass slope”) Signal dominated by chargino-neutralino production 263 pb-1 World best limit: m  108 GeV (DØ) (Also 93 GeV (CDF)) J.-F. Grivaz Euro-GDR 25-November-2004

“Superjets” ? CDF @ Run I observed an excess of W + 2/3 jet events with  1 jet “double-tagged” (Secondary vertex + Soft lepton) 13 vs 4.4  0.6 expected An interpretation in terms of light sbottom + RPV () has been suggested (not by CDF) DØ has searched for such an anomaly in 150 pb-1 of Run II data and did not find any. Let’s wait and see what CDF will find… J.-F. Grivaz Euro-GDR 25-November-2004

Bs   In SM, tiny BR ~ 3.5 109 (and 25 times smaller for Bd) But in SUSY, a (tan)6 factor could lead to an enhancement by as much as three orders of magnitude Select dimuons originating from displaced vertices, and look inside a mass window: BR limits (95% CL): 5.0 10-7 (DØ 240pb-1) and 7.5 10-7 (CDF 171 pb-1) Close to getting relevant J.-F. Grivaz Euro-GDR 25-November-2004

Extra Dimensions J.-F. Grivaz Euro-GDR 25-November-2004

Models of Extra Dimensions Two classes of models considered: ADD 2 to 7 large (sub mm) EDs gravity propagates freely in the bulk KK excitations cannot be resolved RS one 5th (infinite) ED with warped geometry gravity is localized on a brane other than the SM have spacings of order TeV J.-F. Grivaz Euro-GDR 25-November-2004

Large Extra Dimensions Two main search streams at the TeVatron: Real graviton emission Apparent energy-momentum non-conservation in 3D-space  “Monojets” Direct sensitivity to the fundamental Planck scale MD GKK g q Virtual graviton exchange Modifies SM cross sections Sensitivity to the theory cutoff MS (MS expected to be  MD) V GKK f J.-F. Grivaz Euro-GDR 25-November-2004

Monojets DØ search in 85 pb-1: Main selection cuts: one high pT jet ( 150 GeV) (soft jets from ISR are allowed) isolated lepton veto Missing ET away from all jets Missing ET  150 GeV QCD Main background: (Z ) +jet QCD is negligible 63 events selected 100 +51/-32 expected Large error from Jet Energy Scale (Updated result coming soon) J.-F. Grivaz Euro-GDR 25-November-2004

High pT dileptons & diphotons DØ search in 200 pb-1 combines ee and  to maximize the sensitivity Fit of Data to SM+QCD+LED(MS) World tightest limits: MS > 1.36 TeV MS >1.43 TeV w/DØ@Run I in the GRW formalism Also 1.1 TeV: from CDF in dielectrons with 200 pb-1 from DØ in dimuons with 250 pb-1 J.-F. Grivaz Euro-GDR 25-November-2004

Randall – Sundrum gravitons Here too, most of the sensitivity is in diphotons (BR = 2ee) DØ uses the same ee +  data set as for the LED search 300 GeV RS-graviton DØ Run II Preliminary Two model parameters: Mass and coupling (/MPl) For /MPl = 0.1: M  785 GeV Also 690 GeV from CDF in diphotons with 345 pb-1 J.-F. Grivaz Euro-GDR 25-November-2004

Z’ J.-F. Grivaz Euro-GDR 25-November-2004

Z’ in dielectrons Now select only electron pairs (much reduced QCD background) 600 GeV Z’ DØ Run II Preliminary For an SM-like Z’: M  780 GeV Limits for SM-like Z’ and various E6 models Also M > 750 GeV from CDF (200 pb-1) J.-F. Grivaz Euro-GDR 25-November-2004

Z’ in dimuons Dimuons vs. dielectrons: lower background but worse resolution For an SM-like Z’: M  735 GeV Z’ limits in various E6 models Also M  680 GeV from DØ (250 pb–1) Combining ee and : M (SM-like Z’)  815 GeV (CDF) J.-F. Grivaz Euro-GDR 25-November-2004

Z’ in  CDF in 195 pb-1 4 events (eh,h,hh) vs 2.8  0.5 expected J.-F. Grivaz Euro-GDR 25-November-2004

Higgs bosons J.-F. Grivaz Euro-GDR 25-November-2004

SUSY-Higgs @ large tan Hbb coupling enhanced DØ search for  3b jets (130 pb-1) J.-F. Grivaz Euro-GDR 25-November-2004

SM Higgs boson searches LEP indirect: MH < 260 GeV LEP direct: MH > 114 GeV Hint at 115 GeV MH < 130 GeV: Hbb gg H bb hopeless (H  maybe) H(W  l) and H(Z  ll/): best processes Hbb OK for SUSY @ large tan Htt maybe MH >150 GeV: H WW* gg H (W  l)(W* l): best process Also (H WW*)(W l / Z ll) J.-F. Grivaz Euro-GDR 25-November-2004

High mass: HWW DØ search in the ee, e and  + Missing ET final states The WW background is reduced using the spin correlations: smaller ll angle in the Higgs signal (200 pb–1) (147 – 177 pb–1) 2 ee events vs 2.7  0.4 expected 2 e events vs 3.1  0.3 expected 5  events vs 5.3  0.6 expected J.-F. Grivaz Euro-GDR 25-November-2004

Low mass: (Wl)(Hbb) CDF search in 162 pb–1: e/ + Missing ET + 2jets ( 1 b-tag) Similar DØ search (174 pb–1 - e only) with 2 b-tags Still a long way to go… J.-F. Grivaz Euro-GDR 25-November-2004

Are we going there ? LHC Now Updated signal and background cross sections Full detector simulation + established analysis techniques + “reasonable extrapolations” + Signal shape (vs. mass window) (but no systematics…) LHC Now If we are lucky: 3s evidence If not…: 95% CL exclusion of the MSSM range J.-F. Grivaz Euro-GDR 25-November-2004

Final remarks The Higgs is not the whole story… With a data sample at least 20 to 40 times larger than at Run I, collected at higher energy with improved detectors, there is a lot of beautiful (but difficult) physics to be done: W and top masses, top properties, single top production B physics: Bs mixing, rare Bs decays, Bs and Lb lifetimes Exploration of new territory (SUSY, LED…): we may be lucky… already well underway interaction with theorists welcome ! With a steadily improving collider performance there are still a number of years and fb–1 ahead of us for frontier physics at the Tevatron. J.-F. Grivaz Euro-GDR 25-November-2004

Back-up Slides J.-F. Grivaz Euro-GDR 25-November-2004

The CDF and DØ upgrades New silicon and drift chamber Upgraded calorimeter (plug) and muon system New DAQ and new trigger, (displaced track trigger) New tracking: silicon and fibers in 2T magnetic field Upgraded muon system New DAQ and new trigger (commissioning displaced track) … and new software (C++, OO) J.-F. Grivaz Euro-GDR 25-November-2004

The Run II Menu With 2 fb-1: Top mass to  3 GeV W mass to  30 MeV Bs mixing to 20 ps-1 Exclude mH = 115 GeV CDF/D0 2 fb-1goal! And much more… High pT jets LED to 2 TeV SUSY And beyond: J.-F. Grivaz Euro-GDR 25-November-2004

RPV with ijkLiLjLk coupling (I) DØ has searched for multilpeton final states arising from SUSY particle pair production with R-parity violating decays of two neutralino LSP’s in the regime where  is small enough so that only the LSP has an RPV decay, and large enough for its lifetime to be negligible. The couplings considered were 121  eeee, eee or ee +  122  , e or ee +  Three isolated (rather soft) e or  Require some Missing ET  channel-dependent cuts (e.g. anti Z) J.-F. Grivaz Euro-GDR 25-November-2004

RPV with ijkLiLjLk coupling (II) 121: 0 vs 0.5  0.4 expected (238 pb-1) 122: 2 vs 0.6  1.9 expected (163 pb-1) eee/ A search has also been performed for the 133 coupling, in the eeX final state, with   hadrons +  (199 pb-1) Resonant single slepton or sneutrino production via a 211 RPV coupling has also been investigated (154 pb-1) m  200 GeV J.-F. Grivaz Euro-GDR 25-November-2004

Leptoquarks LQ  lq (BR = ) or LQ  q (BR = 1 – ) Pair produced  llqq, lqq or qq final states 2nd generation LQ in qq (CDF – 200 pb-1): 2 muons, 2 jets, Z-veto M  241 GeV 2 events vs 3.2  1.2 expected J.-F. Grivaz Euro-GDR 25-November-2004

1st generation Leptoquarks (I) DØ analysis performed in the eeqq and eqq channels (175 pb-1) 2 electrons, 2 jets and Z-veto 1 electron, missing ET and W-veto ST = ET(e1)+ET(e2)+ET(j1)+ET(j2) ST = ET(e1)+MET+ET(j1)+ET(j2) (After all other cuts) (Before W-veto) 0 events vs 0.4  0.1 expected 2 events vs 4.7  0.9 expected J.-F. Grivaz Euro-GDR 25-November-2004

1st generation Leptoquarks (II) M  238 GeV ( = 1) M  213 GeV ( = 0.5) (DØ – 175 pb-1) Also CDF with 200 pb-1: M  230 GeV ( = 1) M  176 GeV ( = 0.5 not combined) J.-F. Grivaz Euro-GDR 25-November-2004

Leptoquarks in the qq channel Topology = Acoplanar jets + Missing ET Large backgrounds from QCD multijets and from SM processes (Z  jets) Also DØ with 85 pb-1: M  109 GeV 124 events vs 118.5 14.5 expected J.-F. Grivaz Euro-GDR 25-November-2004

Excited electrons CDF search in the ee final state (200 pb-1) Z - veto 3 events vs 3.0  0.4 expected (main background = Z) J.-F. Grivaz Euro-GDR 25-November-2004

Doubly-charged Higgs Bosons Doubly charged Higgs (from Higgs triplets) are predicted in, e.g., LR-symmetric models CDF has searched for H pair production in 240 pb-1 The signature is a pair of same sign ee, e or  0 ee events vs 1.5 +0.90.6 expected 0 e events vs 0.4 0.2 expected 0  events vs 0.8 +0.50.4 expected Also DØ in  (113 pb-1): M(HL) > 118 GeV M(HR) > 98 GeV J.-F. Grivaz Euro-GDR 25-November-2004