Latest New Phenomena Results from Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow

New Phenomena with Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow  Supersymmetry: Squarks/Gluinos Charginos/Neutrallinos  Leptoquarks (2 generation)  RS Gravitons  Extra Gauge Bozons ( )  Excited Fermions ( )  Long-lived Particles Results from statistics 2

Data Set “Run IIa” Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow

Supersymmetry Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow  Most studied extension of the Standard Model to solve many of its shortcomings  New (s)particles, differing from their SM partners by spin 1/2 R-parity: MSSM: R-parity conservation - LSP is stable, s-partners are created in pairs  SUSY must be broken: mSUGRA, GMSB etc.  mSUGRA parameters: 4

Supersymmetry: squarks and gluinos Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow Low, (at least 2 jets) “di-jet” Medium, (at least 3 jets) “3-jet” High, (at least 4 jets) “gluino” MSSM (mSUGRA) R-parity conserved (LSP stable) 5

Squarks and gluinos: results Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow DataSM expectations di-jet5 3-jet6 gluino34 mSUGRA parameters 6

Squarks and gluinos: results Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow Using minimal cross-section 7

Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow Squarks and gluinos: results Iso-squark/gluino mass Yellow band: variations due to PDF uncertainties and renormalization/factorization scale variations CDF ( ): 8

Charginos and Neutrallinos: 3l - state Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow  Gaugino pair production via EW interactions Small cross-sections (0.1 – 0.5 pb)  R-parity conservation LSP stable  LSP escapes detection large MET  SUSY signature: Two electrons or muons Third lepton Large MET Small cross-sections but very clean signature 9

Charginos and Neutrallinos: 3l - state Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow CutDataSM expectedmSUGRA Preselection Anti-Z Third Track MET MET x pT(3)

Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow CutDataSM expectedmSUGRA Preselection MET Isolation Anti-Diboson02.8 CutDataSM expectedmSUGRA Preselection Anti-Z MET Isolation42.9 MET x pT(3)21.8 Charginos and Neutrallinos: 3l - state 11

Charginos and Neutrallinos: Like-sign  Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow Very soft third lepton possible. Instead of requiring 2l+track require 2l of same charge: low background 12

Charginos and Neutrallinos: Like-sign  CutDataSM expectedmSUGRA Preselection MET MET x pT(2) Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow

Trilepton results Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow “Heavy squarks”: maximal production cross-section “3l-max”: mSUGRA with light sleptons, large BR(3l) “large-m0”: W/Z exchange dominates, small BR(3l) in “3l-max” scenario 14

Search for GMSB in diphoton final states Gauge Mediated SUSY Breaking achieved by the introduction of the new chiral supermultiplets (messengers) which couple to the source of SUSY breaking LSP is gravitino, NLSP (neutrallino or slepton) decays to LSP and photon, LSP escapes detection Signature:  + MET One dimensioned parameter  – effective energy scale of SUSY breaking. Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow

Leptoquarks  Leptoquark – boson with third-integer charge, carrying lepton and quark quantum numbers (GUT, Technicolor, Compositeness)  Three generation, each coupling to one fermion generation only  Pair production: no dependence from LQ coupling to l and q Maximal Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow

Leptoquarks: Second Generation M(LQ) > 214 GeV (  =0.5) CDF Run II ( ) M(LQ) > 170 GeV (for  +jets) M(LQ)>208 GeV (  combined) Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow

Randall-Sundrum Gravitons RS Model  Use Extra Dimensions (ED) to address a hierarchy problem  One 5 th (infinite) ED with warped geometry  Gravity is localized on a Plank brane (other than SM brane)  Gravitons appear as a KK excitations in SM brane Signature: narrow, high-mass resonances decaying to ll or  Two parameters: – mass of the first excited mode of the G – dimensionless coupling to the SM fields Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow

Randall-Sundrum Gravitons (combined) Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow CDF ( ): 19

New Gauge Bosons Predicted in several beyond SM scenarios (GUT, left-right symmetric models, etc.) (SM-like W) CDF (Run II, e ) Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow

New Gauge Bosons Previous DO Run II results: (SM-like couplings to fermions) CDF Run II ( ) Small excess of data in ee channel at 240 – 250 GeV Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow

Lepton compositeness  Quarks and leptons may be made of smaller “pieces” (preons)  This allows excited states ( )  Contact Interaction (CI) and Gauge Interactions  – compositeness scale parameter Expected signal for Data: SM expectations: events Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow

Lepton compositeness CDF Run II ( ): DO Run II ( ): CDF Run II ( ): Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow

Long-lived particles decaying into Z  Predicted in many “beyond the SM” models ( GMSB SUSY, hidden valley models, models with extended Higgs sector, fourth generation quarks ( ), e t c.)  Fourth generation quarks model was chosen as a benchmark, events with at least one Z decaying to state were selected Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow

Long-lived particles decaying into Z Benchmark: No excess of events at a large distance from the beam Calculated limits (mass vs. c  plot) Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow

Conclusion  Many searches for beyond Standard Model effects are progressing at Tevatron, you can find much more results on the WWW DO NP page: CDF “Exotic” page:  Standard Model works pretty well and no significant deviations so far have been observed at DO and CDF  All search analysis are benefiting from more data and we expect with in Run II to increase data set by a factor of ~5 – 10  Discoveries may come later – stay tuned! Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow

Backup slides

 In some mSUGRA parameters region (lightest SUSY partner of  ) might be the lightest of all sleptons  Enhanced BR to  –  leptons via  Dominant squark pair production  Signature: at least one  (decaying hadronically) + jets + MET  mSUGRA parameters region: Squarks:  jets + MET Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow B1

Squarks:  jets + MET Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow DataSM predictionsmSUGRA 2 B2

Squarks: scalar top Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow Signature: 2 c-jets + MET B3

First generation ( ) M(LQ)>241(256) GeV (  =1) M(LQ)>218(234) GeV (  (combined Run I and Run II) Leptoquarks: third generation (  b  b state) Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow M(LQ) > 180 GeV (  CDF (, ): M(LQ) > 235 GeV (  B4

Perspective Alexey Popov (IHEP, Protvino) For the DO Collaboration ITEP, Moscow B5