Tevatron Non-SUSY BSM: Searches for Physics Beyond the SM and MSSM David Stuart University of California, Santa Barbara DIS 2007, Munich April 2007

2 David Stuart, DIS2007 Outline There are two categories of searches: 1. Model driven New Dimensions, New Interactions, or New Particles Specifically optimized 2. Signature driven Look for deviations from SM in specific final states Broadly optimized Most recent results use ≈ 1 inverse femtobarn.

3 David Stuart, DIS2007 New Gauge Boson: Z’  ee Signature: Di-electron mass peak Backgrounds: Drell-Yan (Irreducible & dominant) QCD fakes Diboson and top e+e+ q q e-e- Z’Z’ Model: Many unification models

4 David Stuart, DIS2007 New Gauge Boson: Z’  ee Signature: Di-electron mass peak Backgrounds: Drell-Yan (Irreducible & dominant) QCD fakes Diboson and top Model: Many unification models e+e+ q q e-e- Z’Z’

5 David Stuart, DIS2007 New Gauge Boson: Z’  ee Signature: Di-electron mass peak Backgrounds: Drell-Yan (Irreducible & dominant) QCD fakes Diboson and top Model: Many unification models e+e+ q q e-e- Z’Z’

6 David Stuart, DIS2007 New Gauge Boson: W’  e e+e+ q q W’W’ Signature: High transverse mass peak Backgrounds: Tail of W QCD (suppressed w/  cuts on jets w/ E T >15) Model: Many unification models

7 David Stuart, DIS2007 New Gauge Boson: W’  e Limits assume SM couplings e+e+ q q W’W’ Signature: High transverse mass peak Backgrounds: Tail of W QCD (suppressed w/  cuts on jets w/ E T >15) Model: Many unification models

8 RS Extra Dimensions: G  G Signature: Di-photon mass peak Backgrounds: QCD jets faking photons SM di-photon production (dominant at high mass) David Stuart, DIS2007 Model: Strongly coupled graviton in Randall-Sundrum warped extra dimension

9 RS Extra Dimensions: G  G Signature: Di-photon mass peak Backgrounds: QCD jets faking photons SM di-photon production (dominant at high mass) David Stuart, DIS2007 Model: Strongly coupled graviton in Randall-Sundrum warped extra dimension Limits: Comparable to di-leptons Mass limits to 850 GeV when  and ee combined

10 RS Extra Dimensions: G  or ee A similar search at D0 combines ee and  at the analysis stage as di-EM. David Stuart, DIS2007

11 RS Extra Dimensions: G  ZZ  eeee Signature: Four electron mass peak Backgrounds: Very low backgrounds (0.02 ± 0.02 events) so use very loose electron selection. Select Z  ee with a  2. ~3 GeV Signal region:  David Stuart, DIS2007 Model: Strongly coupled graviton in Randall-Sundrum warped extra dimension e e e e G

12 Large Extra Dimensions: Monojet + Missing E T Model: ADD large extra dimensions Backgrounds: David Stuart, DIS2007 Signature: 1 or 2 jets + MET KK 39     13

13 Large Extra Dimensions: Monojet + Missing E T Model: ADD large extra dimensions Backgrounds: David Stuart, DIS2007 Signature: 1 or 2 jets + MET 39     13 No shape difference, so predicted from data.

14 Large Extra Dimensions: Monojet + Missing E T Model: ADD large extra dimensions Backgrounds: David Stuart, DIS2007 Signature: 1 or 2 jets + MET 39     13

15 David Stuart, DIS2007 Excited electron : e*  e  e e e Model: Compositeness Signature: e  mass peak Backgrounds: DY+  Z  ee with brem

16 David Stuart, DIS2007 Model: Compositeness Signature: e  mass peak Backgrounds: DY+  Z  ee with brem Excited electron : e*  e 

17 David Stuart, DIS2007 2nd generation Leptoquark: Signature:  + 2 jets + MET  j mass peak Backgrounds: W+jets & top Model: LQ carries both color and lepton #

18 David Stuart, DIS2007 2nd generation Leptoquark: Signature:  + 2 jets + MET  j mass peak Backgrounds: W+jets & top Model: LQ carries both color and lepton #

19 David Stuart, DIS th generation quark: b’  bZ Model: 4 th gen quark w/ small couplings to 1 st three generations. Signature: Z+ jets At least 3 jets, E T >30 GeV Large total jet energy, J T Background: Z+ jets Predicted from the data by fitting E T spectrum and modeling J T

20 David Stuart, DIS th generation quark: b’  bZ Model: 4 th gen quark w/ small couplings to 1 st three generations. Signature: Z+ jets At least 3 jets, E T >30 GeV Large total jet energy, J T Background: Z+ jets Predicted from the data by fitting E T spectrum and modeling J T

21 David Stuart, DIS th generation quark: b’  bZ Model: 4 th gen quark w/ small couplings to 1 st three generations. Signature: Z+ jets At least 3 jets, E T >30 GeV Large total jet energy, J T Background: Z+ jets Predicted from the data by fitting E T spectrum and modeling J T

22 David Stuart, DIS th generation quark: b’  bZ Model: 4 th gen quark w/ small couplings to 1 st three generations. Signature: Z+ jets At least 3 jets, E T >30 GeV Large total jet energy, J T Background: Z+ jets Predicted from the data by fitting E T spectrum and modeling J T Data consistent with prediction, limits obtained at 0.5 pb and 270 GeV.

23 David Stuart, DIS th generation quark: b’  bZ Top in W+jets is used as a cross-check of the MC-less method W+jets Control Sample Model: 4 th gen quark w/ small couplings to 1 st three generations. Signature: Z+ jets At least 3 jets, E T >30 GeV Large total jet energy, J T Background: Z+ jets Predicted from the data by fitting E T spectrum and modeling J T

24 David Stuart, DIS2007 Model Independent Searches Making a search model-specific increases its sensitivity at the cost of breadth. Making a search less specific increases its breadth at the cost of sensitivity. There are several model-independent search results from the Tevatron…

25 David Stuart, DIS2007 Search for high p T Z Background: Z+ jets QCD from same-sign data Others predicted with MC

26 David Stuart, DIS2007 Search for high p T Z Background: Z+ jets QCD from same-sign data Others predicted with MC

27 David Stuart, DIS2007 Search for Z + X X Expected e + e - Observed e + e - Expected     Observed     Leptons 1.6 ± ± 0.42 Photons 12.4 ± ± HTHT MET85.4 ±

28 ≥2 jets ee Same sign ee/  SM2.9±1.51.5±0.8 Data20 Search Region David Stuart, DIS2007 Search for Dilepton + X Background: Z+jets, Z+ , Diboson, top, QCD where X = , H T, MET, high E T jets, b-jets, leptons Highest H T event looks top-like, with a b-tag and 3 jets. “Unusual” dileptons + 2j + H T >400

29 Partially motivated by Run I ee+  +MET candidate event γγe   +MET MET>75 SM6.8±0.80.8±0.12.2± ±0.22 Data3041 David Stuart, DIS2007 Search for  + X, where X = e/  /  /MET

30 David Stuart, DIS2007 Search for Stable CHArged Massive Particles (CHAMPs) If heavy, a CHAMP would penetrate like a muon, but it would be slow. D0 searched with muon chamber scintillator timing, and CDF searched with its TOF counters. Limits on  A of 10 fb if weakly interacting and 48 fb if strongly interacting.

31 David Stuart, DIS2007 Summary CDF and D0 have varied searches, both model specific and model independent. Some fluctuations seen, as one would expect in a large ensemble of measurements.

32 David Stuart, DIS2007 Summary CDF and D0 have varied searches, both model specific and model independent. Some fluctuations seen, as one would expect in a large ensemble of measurements. The Standard Model wins again.

33 David Stuart, DIS2007 Summary CDF and D0 have varied searches, both model specific and model independent. Some fluctuations seen, as one would expect in a large ensemble of measurements. The Standard Model wins again. But, we are not done hammering away at it: The Tevatron expts will collect about 4x more data.

34 David Stuart, DIS2007 Summary CDF and D0 have varied searches, both model specific and model independent. Some fluctuations seen, as one would expect in a large ensemble of measurements. The Standard Model wins again. But, we are not done hammering away at it: The Tevatron expts will collect about 4x more data. There is a Larger Hammer Coming.