1. Exotics at the LHC Sam Harper (RAL, STFC) UK HEP Forum 08/09/11 Sam Harper - Exotics - HEP Forum UK1/37

2. EXO Searches at LHC from Ian’s EXO HEP Forum UK talk last year: Huge number of Exotic results out – ATLAS: 15 papers – CMS: 20 papers will only focus on results with 2011 data – some interesting results missed sadly – 7 ATLAS, 18 CMS results with 2011 data 08/09/11 Sam Harper - Exotics - HEP Forum UK correct! (and thanks for inviting me to give this talk Ian ) 2/37

3. Exo 2011 Searches New Gauge Bosons – di-lepton, di-jet, ttbar, di-lepton+di-jet final states, lepton+MET, WZ Extra Dimensions – di-fermion, di-photon, jet+MET, photon + MET Long Lived – displaced muons/electrons – stopped gluinos 4 th Generation fermions – t’, b’, T The Truly Exotic…. – blackholes, heavy stable charged particles, W+dijet 08/09/11 Sam Harper - Exotics - HEP Forum UK see recent “Implications of LHC results for TeV-scale physics” https://indico.cern.ch/conferenceOth erViews.py?view=standard&confId=1 41983 for a more detailed set of talks 3/37

4. New Gauge Bosons 08/09/11 Sam Harper - Exotics - HEP Forum UK4/37

5. Z’->ee / µµ classic discovery channel: – inclusive search: mass of 2 leptons |η|<2.5, no cuts on MET / other activity in event – no OS required eles / OS required muons excitement early on this year but sadly died away no significant excess: – highest in CMS: 970 GeV, local: 2.1sigma with LEE effect, 0.2 sigma – ATLAS doesn’t quote highest excess, its either ~570 GeV or ~950 GeV with similar significance to CMS 08/09/11 Sam Harper - Exotics - HEP Forum UK acc (ele)res (ele)acc (mu)res (mu) CMS64%1.7%80%7% ATLAS65%*~1%40%*15% *ATLAS accxeff quoted at 1.5 TeV but should be similar at 1 TeV UK effort both ATLAS + CMS! 5/37

6. Z’->ee / µµ 08/09/11 Sam Harper - Exotics - HEP Forum UK acc (ele)res (ele)acc (mu)res (mu) CMS64%1.7%80%7% ATLAS65%*~1%40%*15% *ATLAS accxeff quoted at 1.5 TeV but should be similar at 1 TeV classic discovery channel: – inclusive search: mass of 2 leptons |η|<2.5, no cuts on MET / other activity in event – no OS required eles / OS required muons excitement early on this year but sadly died away no significant excess: – highest in CMS: 970 GeV, local: 2.1sigma with LEE effect, 0.2 sigma – ATLAS doesn’t quote highest excess, its either ~570 GeV or ~950 GeV with similar significance to CMS 6/37

7. Z’->ee / µµ: Limits limits: – ATLAS/CMS about the same ele – CMS does much better muons note: CMS missed the c u –c d from this update due to lack of time but will happen for next update ModelMass Limit (GeV) eeμμee+μμ CMS173017801940 ATLAS170016101830 08/09/11 Sam Harper - Exotics - HEP Forum UK Z’ SSM limits 7/37

8. 35pb -1 to 1.1fb -1 Z’->ee/µµ exclusion from 0.05pb to 0.002pb large jump in sensitivity – thanks LHC! 08/09/11 Sam Harper - Exotics - HEP Forum UK8/37

9. Z’/W’->di-jet search di-jet resonance – CMS |η|<2.5, |Δη|<1.3, ATLAS, |η|<2.8 |y*|<0.6 good agreement with data to fit parameterisation – no evidence of any significant excess 08/09/11 Sam Harper - Exotics - HEP Forum UK9/37

10. Z’/W’->di-jet limits are final state dependent – FSR reduces resolution – gg final states: more FSR, worse resolution, worse limits ATLAS better jet resolution means they are slightly ahead 08/09/11 Sam Harper - Exotics - HEP Forum UK mass limit (TeV) exptobs ATLAS2.812.99 CMS2.682.49 excited quark limits CMS also quotes W’ limit of: 1-1.55 TeV 10/37

11. Z’/W’->dijet: Wide Jets 08/09/11 Sam Harper - Exotics - HEP Forum UK inspired by recent jet grooming algos aim is to improve FSR recovery and therefore resolution – previously used Anti-k T 0.7 jets wide jet algo starts with anti-k T 0.5 jets – identifies two leading jets – for each of these jets, sums in all surrounding jets in ΔR cone of 1.1 gg states have more FSR – wide jet algo improves resolution – reduces differences between qq, qg and gg limits combine into single ‘wide jet’ 11/37

12. Z’->ttbar top particle can be special in BSM theories new physics can preferentially couple to it – important channel to study current analyses: – semi-leptonic – di-lepton modes – fully hadronic (boosted) 08/09/11 Sam Harper - Exotics - HEP Forum UK UK effort on ATLAS here! 12/37

13. Z’->ttbar top particle can be special in BSM theories new physics can preferentially couple to it – important channel to study current analyses: – di-lepton modes – semi-leptonic – fully hadronic (boosted) 08/09/11 Sam Harper - Exotics - HEP Forum UK13/37

14. non-resonant signature due to MET – look for excess in high end tail similar to Z’ analysis, just replace 1 lepton with MET – efficiency: ~80% in both channels – CMS uses particle flow based MET excellent agreement between SM + data – no hint of any excess in 1fb -1 – see what 2011 dataset offers set limits using Bayesian cut and count above M T threshold optimized on signal samples W’->eν / μν 08/09/11 Sam Harper - Exotics - HEP Forum UK14/37

15. W’->eν / μν 08/09/11 Sam Harper - Exotics - HEP Forum UK σ.Br limits both very similar – ATLAS slightly better expected, CMS better obs ATLAS: – ~8fb at 1 TeV to ~10fb at 2.5 TeV CMS: – ~7fb at 1.4 TeV to ~9fb at 2.5 TeV exptobs ATLAS2.23 TeV2.15 TeV CMS2.18 TeV2.27 TeV W’ mass limits 15/37

16. W’->WZ->3lν, l=e,μ event selection: – 2 same flavour opposite charge leptons with 60<M ll < 120 – 1 more high p T lepton + MET > 30 GeV – H T cut, optimised for each W’ mass analysis motivated by technicolor limits set by Bayesian cut and count technique HT Cut for 600 GeV W’ 08/09/11 Sam Harper - Exotics - HEP Forum UK16/37

17. W’->WZ->3lν, l=e,μ event selection: – 2 same flavour opposite charge leptons with 60<M ll < 120 – 1 more high p T lepton + MET > 30 GeV – H T cut, optimised for each W’ mass analysis motivated by technicolor limits set by Bayesian cut and count technique HT Cut for 600 GeV W’ 08/09/11 Sam Harper - Exotics - HEP Forum UK17/37

18. W R + Heavy Neutrino searches for W R to heavy ν predicted by L-R SM extension – require 1 lepton > 60 GeV accxeff: 50% ele, 60% muons 08/09/11 Sam Harper - Exotics - HEP Forum UK18/37

19. Extra Dimensions 08/09/11 Sam Harper - Exotics - HEP Forum UK TeV Planck Bulk (y) 19/37

20. Di-Photon favoured channel for ED – factor 2 high BR to photons over eles/muons requires two photons with E T > 70 GeV, |η|<1.44 – data driven background estimates of jet background – di-photon background from pythia reweighted by mass dependent NLO k-factor from DIPHOX+GAMMA2MC searches for both warped (resonant) and ADD (non- resonant) scenarios 08/09/11 Sam Harper - Exotics - HEP Forum UK k/M plγee + μμ 0.010.77- 0.051.411.45 0.101.741.78 RS Graviton Mass Limits (TeV) UK effort on ATLAS here! 20/37

21. Mono Jet searches for jet + MET – benchmark model: ADD extra dim main background: Z->νν + jets – estimate from Z->μμ + jet events limits are cut and count above optimised jet/ MET thresholds 08/09/11 Sam Harper - Exotics - HEP Forum UK δM D limit ATLASCMS 23.23.7 42.32.6 62.02.2 UK effort on ATLAS + CMS! 21/37

22. Mono Photon 08/09/11 Sam Harper - Exotics - HEP Forum UK searches for γ + MET – pho E T > 95 GeV, |η| 80 GeV – benchmark model: ADD extra dim main background: Z->νν+γ – estimate direct from MC – estimate jet backgrounds from data δ M D limit photonjet 21.23.7 41.22.6 61.32.2 22/37

23. fourth family 08/09/11 Sam Harper - Exotics - HEP Forum UK23/37

24. t’->bW search for t’t’ ->bWbW – ie ttbar search but with higher mass done in lepton+jets, di-lepton channels uses mass techniques used in top mass methods 08/09/11 Sam Harper - Exotics - HEP Forum UK24/37

25. t’->bW limits set using CL S method on measured mass spectra t’ mass limit: – dilepton: 422 GeV – lepton + jet: 450 GeV 08/09/11 Sam Harper - Exotics - HEP Forum UK25/37

26. T->tZ search for vector like charge 2/3 quark decaying to tZ – can appear in UED, composite Higgs models, Little Higgs signature: – Z->ee/μμ + 1e/μ + 2 jets eles > 20 GeV, jets > 25 GeV, muons > 15 GeV search variable: – S T = Σ jet + lep p T – cut S T > 80 GeV total acc: – 14-35% from 250 to 550 GeV 08/09/11 Sam Harper - Exotics - HEP Forum UK26/37

27. b’->tW signature: – 2 same sign leptons + 2 jets (1 b-tag) – 3 lepton (2 opp sign) + 1 b-tag jet looks for excess in S T distribution 08/09/11 Sam Harper - Exotics - HEP Forum UK27/37

28. Long Lived 08/09/11 Sam Harper - Exotics - HEP Forum UK28/37

29. Displaced leptons search for neutral objects decaying to ele/mu pairs – eg H 0 -> 2X, X->l + l - look for tracks with large transverse impact parameter 08/09/11 Sam Harper - Exotics - HEP Forum UK cosmic data from MC data / MC difference leads to 20% uncertainty on displaced track eff UK effort on CMS here! 29/37

30. Displaced Leptons signal selection: – high transverse impact cut significance – p T > 38 GeV (ele), 25 GeV (mu) – have dedicated trackless triggers muons: expect 0, obs 0 electrons: some bkg around Z 08/09/11 Sam Harper - Exotics - HEP Forum UK estimate backgrounds from extrapolation of decay length significance 30/37

31. Stopped SUSY looks for long lived particles stopping in CMS – specifically the central region of HCAL – 40-50% gluinos, 30-20% stops stop trigger on 50 GeV jets when there is no beam – main bkgs: beam halo, comics, detector noise – cuts reduce event rate to O(10 -5 Hz ) – 12-13% efficient for stopped particles probes lifetimes from 75ns to ~2 weeks 08/09/11 Sam Harper - Exotics - HEP Forum UK UK effort on CMS here! 31/37

32. Exotic Exotics 08/09/11 Sam Harper - Exotics - HEP Forum UK32/37

33. Same Sign Muon Pairs a catch all exo search – same sign di-lepton signatures come from variety of models – main motivation is double charged Higgs searches for two SS muons, p T > 20/10 GeV, |η|<2.5 sets model independent limits total cross-section above mass M 08/09/11 Sam Harper - Exotics - HEP Forum UK33/37

34. W+2jets follow up on the CDF bump using cuts as close as possible to CDF – no excess observed 08/09/11 Sam Harper - Exotics - HEP Forum UK34/37

35. Blackholes searches for high S T events – S T : Σp T of all objects > 50 GeV in event (including MET) low multiplicity (N=2,3) control region – S T shape of QCD bkg independent of number of final state objects – fit to this region to get bkg shape search for new physics in high multiplicity region (N>3) 08/09/11 Sam Harper - Exotics - HEP Forum UK 9 jet candidate with S T =2.6 TeV UK effort on ATLAS here! CMS UK also starting out 35/37

36. Blackholes no evidence of any signal set limits on various black hole types 08/09/11 Sam Harper - Exotics - HEP Forum UK36/37

37. Summary CMS + ATLAS have produced many many exotic searches for new physics – huge phase space explored where new physics could have been lurking no significant deviation seen in any channel – slightly concerning – but on other hand shows we understand our detectors very well but good news: the LHC is delivering lots of lumi, our detectors are working perfectly – all we need now is nature to be kind to us (and to make sure we trigger on it…) 08/09/11 Sam Harper - Exotics - HEP Forum UK37/37

38. References for much more information please see: – https://twiki.cern.ch/twiki/bin/view/AtlasPublic/E xoticsPublicResults https://twiki.cern.ch/twiki/bin/view/AtlasPublic/E xoticsPublicResults – https://twiki.cern.ch/twiki/bin/view/CMSPublic/P hysicsResultsEXO https://twiki.cern.ch/twiki/bin/view/CMSPublic/P hysicsResultsEXO 08/09/11 Sam Harper - Exotics - HEP Forum UK38/37

39. Backups 08/09/11 Sam Harper - Exotics - HEP Forum UK39/37

40. Z’->ττ actively being worked for 2011 – stay tuned… low backgrounds but complicated final state – acceptance: of order ~15% at 1 TeV over all channels MET in final state means Z’ is wide, signal will not be as clear cut as in light leptons Bayesian binned likelihood for limits 08/09/11 Sam Harper - Exotics - HEP Forum UK EXO-10-022 40/37

41. non-resonant signature due to MET – look for excess in high end tail similar to Z’ analysis, just replace 1 lepton with MET – 0.4 2.5 – acceptance: 80% in both channels excellent agreement between SM + data – no hint of any excess in 1fb -1 – see what 2011 dataset offers set limits using Bayesian cut and count – exclusion W’ up to 2.27 TeV W’->eν / μν channelσ.Br limit at 1.4 TeV (pb) σ.Br limit at 2.5 TeV (pb) eνeν0.0110.012 μν0.0060.008 combined0.00420.0055 08/09/11 Sam Harper - Exotics - HEP Forum UK41/37

42. W’/Z’ Summary channelσxbr 95% CL limit (pb) 0.5 TeV1 TeV2 TeV3 TeV Z’->ee,µµ0.0080.0050.002 Z’->ttbar (had)n/a40.50.1 Z’->ttbar (μ+jet)n/a30.20.1 Z’->ττ (35pb -1 )31n/a Z’/W’->di-jet (qq) n/a10.10.02 W’->enu/munun/a 0.0045n/a W’->WZ->3l 1nu0.02~0.008*n/a 08/09/11 Sam Harper - Exotics - HEP Forum UK *limit at 0.9 TeV 42/37

43. e*/μ* searches for excited states of composite fermions with scale Δ – pp->ll*->llγ update in progress for 2011 08/09/11 Sam Harper - Exotics - HEP Forum UK arXiv:1107.1773 43/37

44. Leptoquarks search for pair production of lepto quarks – not yet updated to 2011 data search in following channels: – eejj, μμjj, eνjj no excess is found 08/09/11 Sam Harper - Exotics - HEP Forum UK44/37