1 / 32

Other Searches at LEP

Moriond QCD week 18-24 March 2001. Other Searches at LEP. Sylvie Braibant CERN. RPV-SUSY GMSB Technicolor Excited leptons Leptoquarks. Searches Variants. • R-parity conserving SUSY (LSP stable Æ missing energy) • Standard SUSY: neutralino LSP (see T. Alderweireld’s talk)

heba
Download Presentation

Other Searches at LEP

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. MoriondQCD week 18-24 March 2001 Other Searches at LEP Sylvie Braibant CERN RPV-SUSY GMSB Technicolor Excited leptons Leptoquarks

  2. Searches Variants • R-parity conserving SUSY (LSP stable Æ missing energy) • Standard SUSY: neutralino LSP (see T. Alderweireld’s talk) • GMSB: gravitino LSP G • light G (eV Æ GeV) with possibly long lifetime of slepton or neutralino NLSP: either c1 or l • super-light G (meV) • R-parity violating SUSY (LSP decays to SM particles) • vast field with very different signatures • Exotics • Technicolor • Leptoquarks • Excited Leptons ~ ~ ~ ~ 0 ~ Sylvie Braibant - CERN

  3. RPV SUSY: Superpotential Sylvie Braibant - CERN

  4. RPV SUSY: R-Parity • Assumptions • exactly 1l-like coupling different from 0 at the time • mean path of flight < 1 cmÆ l> 10-4 Sylvie Braibant - CERN

  5. RPV SUSY: Production Mechanisms Sylvie Braibant - CERN

  6. RPV SUSY:Gaugino Searches Sylvie Braibant - CERN

  7. mc1 > 40 GeV ~ 0 RPV SUSY: Gaugino Searches for l Sylvie Braibant - CERN

  8. RPV SUSY: Gaugino Searches for l’ Final states contain many jets and leptons Sylvie Braibant - CERN

  9. mc1 > 38 GeV ~ 0 RPV SUSY: Gaugino Searches for l’’ Final states with up to 10 jets Sylvie Braibant - CERN

  10. RPV SUSY: Slepton Searches Sylvie Braibant - CERN

  11. RPV SUSY: Slepton Searches - MSSM limits l’’ l Similar results for squarks, sneutrinos for RPV l, l’, l’’ decays Sylvie Braibant - CERN

  12. RPV SUSY: Sneutrino Searches - Resonant Production Sylvie Braibant - CERN

  13. RPV SUSY • Searches for Rp-violating production and decay of SUSY particles are complementary to searches with Rp-conservation • Under the assumption of Rp-violation, searches have been performed for gauginos, sleptons, sneutrinos and squarks for all Yukawa couplings l, l’, l’’ • No evidence for SUSY with Rp-violation • Exclusion limits are similar to the Rp-conserving case Sylvie Braibant - CERN

  14. GMSB SUSY Searches: Light Gravitino Scenarios Sylvie Braibant - CERN

  15. GMSB SUSY Searches Sylvie Braibant - CERN

  16. l 0 GMSB SUSY Searches: Neutralino NLSP L << LDet Acoplanar photons Zero Lifetime L ~ LDet Single non-pointing photon Non-zero Lifetime Sylvie Braibant - CERN

  17. GMSB SUSY Searches: Neutralino NLSP Acoplanar photons Zero Lifetime Sylvie Braibant - CERN

  18. GMSB SUSY Searches: Neutralino NLSP Non-pointing single photons Non-Zero Lifetime Sylvie Braibant - CERN

  19. GMSB SUSY Searches: Slepton NLSP l 0 Zero Lifetime Acoplanar leptons Exclusion plots for Sleptons in gravity-mediated Heavy stable charged particles dE/dx or RICH detectors Large IP + kinks Large IP Æ L=O(1 mm)-O(40 cm) Kinks Æ L=O(10 cm)-O(2 m) Sylvie Braibant - CERN

  20. ~ Combining searches in various regions of l lifetime GMSB SUSY Searches: Slepton NLSP Intermediate lifetime Searches for large impact parameters+ Searches for kinks Sylvie Braibant - CERN

  21. s - mf 2 Eg = 2 √ s GMSB SUSY Searches: Sgoldstino e+e-Æ fg Depends on mf and √ F Most relevant decays: f Æ gg (4-11%) f Æ gg (96-89%) M1 M2 M3 1) 200 300 400 2) 350 350 350 Sylvie Braibant - CERN

  22. • Provides a scheme to generate W/Z masses. EW symmetry broken dynamically by strong interactions of gauge bosons. • Introduces new technifermions which obey a QCD-like Interaction with an effective scale LTC >> LQCD • At LTC , TC interation becomes strong Æ techniquark condensates replace non zero VEV of Higgs field: <TT> = Fp~ 246 GeV • Extensions are worked out to solve problems: • These extensions call for a large number ND of technidoubletsÆ additional scalar (pT, p’T) and vector (rT, wT) mesons which can be light enough to be observed at LEP2. TVa TDa Technicolor _ Sylvie Braibant - CERN

  23. - e+e-ÆrTÆ ff (below WW threshold) e+e-ÆrTÆ W+W- (above WW threshold) - - Important decays pT+Æ bc, bu Technicolor rTÆ W±pT±, pT0g rTÆpT-pT+ Sylvie Braibant - CERN

  24. Technicolor No significant contribution of technicolor production is observed Æ 95% CL exclusion region in the (MrT, MpT) plane Sylvie Braibant - CERN

  25. Excited Leptons Sylvie Braibant - CERN

  26. Exited Leptons Sylvie Braibant - CERN

  27. Flavour95% mass limits (GeV) e* 102.9 m* 102.9 t* 102.8 Excited Leptons Sylvie Braibant - CERN

  28. Leptoquarks Single Production Pair Production Sylvie Braibant - CERN

  29. Leptoquarks Production Sylvie Braibant - CERN

  30. Leptoquarks Vector Leptoquarks Sylvie Braibant - CERN

  31. Leptoquarks Scalar Leptoquarks Sylvie Braibant - CERN

  32. Conclusions • LEP has been a great success until its very end • A broad spectrum of new particle searches have been and are actively pursued… but no indication for Physics beyond the SM • Results are interpreted in various models • Existing limits have been extended: plenty of preliminary results using all the data collected at LEP LEP SUSY working group combining results on: GMSB and RPV LEP exotica working group starting to combine results on: single top, excited leptons, leptoquarks • We are working towards FINAL LEP results • Apologies for results which were not shown • Many thanks to my LEP colleagues who helped me to prepare this talk Sylvie Braibant - CERN

More Related