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4-f Contact Interactions

f ´. f. f. f ´. 4-f Contact Interactions. Experimental results from HERA, LEP and Tevatron. Corinne Goy LAPP – Annecy-Le-Vieux. Physics Beyond The Standard Model. Corinne.Goy@lapp.in2p3.fr. Formalism (Eichten et al.).

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4-f Contact Interactions

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  1. f ´ f f f ´ 4-f Contact Interactions Experimental results from HERA, LEP and Tevatron. Corinne Goy LAPP – Annecy-Le-Vieux Physics Beyond The Standard Model. Corinne.Goy@lapp.in2p3.fr

  2. Formalism (Eichten et al.) •  : Constructive or destructive interference with SM •  = 0,± 1 : Relative sign of the different helicity contributions ef : Energy scale of the new physics • Flavours and helicity : numerous combinations • The various colliders are sensitive to different couplings • Lepton & Quark universality, SU(2) U(1) symmetry Corinne.Goy, LAPP Annecy-Le-Vieux. EPS-2003

  3. Some Contact Interactions Models Parity Violating Models constrained by low energy experiment such as Atomic Parity Violation e-u, e-d: LL,RR,LR,RL > ~10 TeV Contact Interactions with Scalar couplings: [eiei][fjfj] Tensor couplings: [eiei][fjfj] well constrained by measurements from pion decay , anomalous magnetic moment (e,) Corinne.Goy, LAPP Annecy-Le-Vieux. EPS-2003

  4. HERA • Sensitivity to eeqq : • valence quark • Observables : • Neutral Current : d/dQ2 • Luminosity : • e-p : ~16 pb-1 @ s = 319 GeV • e+p : ~ 101 pb-1 @ s = 301, 319 GeV • Experimental uncertainty • Energy scale , P-id : 3 % • Lum uncertainty : 1.5 to 1.8 % Corinne.Goy, LAPP Annecy-Le-Vieux. EPS-2003

  5. HERA : H1 final distribution SM uncertainty ~ 1% : s = 0.1185 +/- 0.003 Corinne.Goy, LAPP Annecy-Le-Vieux. EPS-2003

  6. HERA Final H1 limits e-u only - 1.6 – 5.5 TeV + 2.8 – 5.3 TeV Corinne.Goy, LAPP Annecy-Le-Vieux. EPS-2003

  7. EW Charge Distribution prel. Final H1 limits :  electron point like Corinne.Goy, LAPP Annecy-Le-Vieux. EPS-2003

  8. Tevatron • Unique sensitivity to : • 4q and qq • mainly valence quarks for initial states • Observables : • d/dM jet jet • Drell-Yan production : d/dM ll spectrum • Run I : ~110 pb –1/exp @ s = 1.8 TeV • Run II : ~ 130 –150 pb-1/exp @ s = 1.96 TeV … • Exp syst : jet energy scale, luminosity • Theoretical uncertainty due to PDF and renormalisation scale Corinne.Goy, LAPP Annecy-Le-Vieux. EPS-2003

  9. Tevatron +LL- 4q > 2.7 Tev @ D0 Run I -LL- 4q > 2.4 TeV (Update D0/ CDF speakers @ this conference for recent results using Run II data) +q(-q) > 2.9 (3.5) TeV @ CDF Run I Corinne.Goy, LAPP Annecy-Le-Vieux. EPS-2003

  10. LEP II • Unique sensitivity to • 4 Leptons • Heavy Quarks • Neutrino • Observables : 2-fermions cross-sections : (e+e-  ff ), d/dcos Asymmetries : AFB  Heavy Flavours : Rb, Rc, AFBb, AFBc • s : from 130 to 208 GeV cumulating 700 pb-1 / exp  2.8 fb-1 @ LEP • with S = 189 GeV L = 680 pb-1 @ LEP • with S = 208 GeV L = 650 pb-1 @ LEP Corinne.Goy, LAPP Annecy-Le-Vieux. EPS-2003

  11. 2-Fermions Cross-Sections and Asymmetries qq = +1.7  Corinne.Goy, LAPP Annecy-Le-Vieux. EPS-2003

  12. Heavy Quarks SM : -2.08  +0.30  SM : -1.56  -0.24  Corinne.Goy, LAPP Annecy-Le-Vieux. EPS-2003

  13. Fully Leptonic -  > 9 TeV Corinne.Goy, LAPP Annecy-Le-Vieux. EPS-2003

  14. Selecting couplings to u/d Hadronic

  15. LEP : Neutrinos Contact Interactions Simulation Single  final states Z return Corinne.Goy, LAPP Annecy-Le-Vieux. EPS-2003

  16. 22GF = 4/2   > 1.3 TeV DELPHI : Neutrinos Contact Interactions Interpretations : e+e- ee ,  e+e-  ,    Coloured regions are not excluded Corinne.Goy, LAPP Annecy-Le-Vieux. EPS-2003

  17. DELPHI: Single Top SM 0 Corinne.Goy, LAPP Annecy-Le-Vieux. EPS-2003

  18. f f Z’ GKK LQ ~  f Defined Models Sensitivity to masses well beyond s f Corinne.Goy, LAPP Annecy-Le-Vieux. EPS-2003

  19. Z’ :  MZ’ LEP : 2-fermions cross-sections and asymmetries. (LEP1 : Z-Z’ mixing = 0) Corinne.Goy, LAPP Annecy-Le-Vieux. EPS-2003

  20. R-Parity Violating Sneutrinos From e+e-  e+e- differential cross-sections Aleph Preliminary (final statistics) 4 * Luminosity ~ Corinne.Goy, LAPP Annecy-Le-Vieux. EPS-2003

  21. Large Scale Gravity : 4  /2 = f /MS4 Prel. LEP : d(e+e- e+e-)/dcos (M. Sanders @ this session) Corinne.Goy, LAPP Annecy-Le-Vieux. EPS-2003

  22. LEP L3 Leptoquarks : 4  /2 =  g2 /MLQ2 Scalar Leptoquarks with F=2 (S0L) (A.F Zarnecki @ this session) Corinne.Goy, LAPP Annecy-Le-Vieux. EPS-2003

  23. Conclusion • 4-Fermions Interactions well described so far by the Standard Model •  > 1 to 10 TeV • Precision measurements (LEP-HERA) • Z’SM > 1.7 TeV • Ms > 1 TeV • MLQ > Several 100 GeV for g = 0.3 • Tevatron : 2fb-1 • e/-q(u,d) : ~ 7 TeV • Ms ~ 2 TeV • HERA II : • Polarisation Program : specific helicity states • LHC : …… but let’s hope for direct New Physics discoveries. Corinne.Goy, LAPP Annecy-Le-Vieux. EPS-2003

  24. Leptoquark : Couplings e-c / e-b  Rb, AFBb  Rc, AFBc and -had Corinne.Goy, LAPP Annecy-Le-Vieux. EPS-2003

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