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CDF Searches Overview

Extra Dimension. CDF Searches Overview. I’ll breifly introduce the. Extra Dimensional Models and their Signatures Introduction to the Tevatron and CDF Search channels, Search Strategy Comparison of Background Expectation to Data Preliminary Results Summary and Outlook.

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CDF Searches Overview

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  1. Extra Dimension CDF Searches Overview I’ll breifly introduce the • Extra Dimensional Models and their Signatures • Introduction to the Tevatron and CDF • Search channels, Search Strategy • Comparison of Background Expectation to Data • Preliminary Results • Summary and Outlook Tracey Pratt Liverpool University EuroGDR, Frascati, Italy November 2004 * searches presented by A. Anastassov

  2. ADD Taking compact space to be very large Gravity freely propagates in the many large extra dimensions (n>2) MPl2 = VnMPl(4+n)(2+n) To solve hierarchy: G MPl(4+n) ~ 1 TeV Extra Dimensional Solutions the Hierarchy Problem (MEW << MPlanck?) RS Curvature of the extra dimension compactified Planck TeV brane 1 highly curved extra dimension Gravity localised in the ED Torus Scale of physical phenomena on the TeV-brane is specified by the exponential warp factor: = MPle-kRc ~ TeV if kRc ~11-12. Vn = 2Rcn  requires Rc ~ 10(30/n–19) m for n  2, Rc < 1 mm Potentially experimentally detectable at detectors … hep-ph 9803315 hep-ph 9905221 EuroGDR, Frascati, Italy November 2004

  3. CDF @ Tevatron pp Collider Highest energy collider operating in the world! CDF p p D0 Total Luminosity pb-1 Run I (1992-1996) √s  1.8 TeV, 110 pb-1 Run II (2001-2009) √s 1.96 TeV Physics Analyses use ~200-345pb-1 collected between 02/02 and 07/04 700 600 500 400 300 200 100 0 Delivered To Tape days EuroGDR, Frascati, Italy November 2004 Ldelivered ~400/pb Run II (2001-2009) √s 1.96 TeV Physics Analyses use ~ 200/pb collected between 03/02 and 09/03 diphoton search 300/pb and ability to set improved limits on new physics

  4. G G G g,q jet,V g,q g,q f,V g,q f,V G g,q g,q f,V f,V Gravitons, do not interact with the detector, and radiate into the bulk, appearing as missing energy (ET): jet + ET + ET g,q g,q V 10-2 10-4 10–6 10-8 Dilepton channel d/dM (pb/GeV) K/MPl 1 0.7 0.5 0.3 0.2 0.1 RS model Tevatron 700 GeV KK graviton 400 600 800 1000 Mll (GeV) General Signatures Experimental Signatures for ED New Parameter Fundamental mass scale MD and R are related to Newton’s constant GN-1 and the number of extra dimensions by GN-1= 8RnM2+nD probe Kaluza-Klein gravitons (GKK)by: Gravitonemission Search for ET + jet(s), ET + V ADD Jet(s) + ET g + ET in association with a vector-boson Graviton exchange New Parameter Fundamental mass scale MD GN-1= 8RnM2+nD , where GN-1 Newton’s constant Search for deviations in cross sections and asymmetries of SM processes ADD & RS New Parameters? Run I l=+1 • New Parameters (Hewett formalism) • Ms ,(MD = MPl(4+n)) • , dimensionless parameter, 1 Mmm(GeV) Mll (GeV) Gupta et. al. hep-ph/9904234 EuroGDR, Frascati, Italy November 2004 Mll(GeV) Since gravitons can propagate in the bulk, energy and momentum are not conserved in the GKK emission from the point of view of our 3+1 space-time Since the spin 2 graviton in generally a has a bulk momentum component , its spin from the point of view of our brane can appear as 0, 1 or 2 Ms is the Planck scale in the extra dimensions  is a dimensionless parameter of order  1 • Two classes of experimental tests • Graviton emission • and a photon or a jet recoiling against it, • Gravitons, do not interact with the detector, and radiate into the bulk appearing as missing energy: • jet + ET  + ET • Cross section depends on the number of extra dimensions • 2. Graviton exchange • Deviations in the cross section from SM predictions the collider signatures include single photons/Z/jets with missing ET or fermion/vector boson pair production

  5. ADD RS CDF ED Search Channels This shows an overview/summary of the … CDF searches performed  Completed  On their way! Have Run gg+ee ADD results as back up! (top pair, Search Strategy Aim to make generic signature-based searches (e.g. ee channel) Perform general searches comparing data to expectation So we can interpret data according to many new models (e.g. G: RS and ADD, Z’: SM, E6; RPV  )! being updated So use same data for ee ADD and RS model EuroGDR, Frascati, Italy November 2004 for completeness I’ll summarise the Run I results too: to show all CDF ED results – breifly and point out improvements being made for Run II – I’ll concentrate on Run II results

  6. Events surviving cuts 15,046 1,475 94 11 qq  GKK 104 103 102 101 1 Events per 5 GeV 0 100 200 300 400 Corrected photon ET G Emission: +Et CR cuts are timing cuts (No jets with ET > 15 GeV and No tracks with pT > 5 GeV) are to remove backgds from W and events in which mismeasurement of jet energy produces fake MEt 87 pb-1 Run I Search Selection - One  with ET > 55 GeV and ||<1 - ET > 45 GeV - No jets with ET > 15 GeV - No tracks with pT > 5 GeV The fundamental mass scale MD and R are related to Newton’s constant GN-1 and the number of extra dimensions by GN-1= 8RnM2+nD Numbers don’t add due to rounding Main backgrounds but no track is found irreducible Other backgrounds: W->e nu, where the e is misidentified as a photon W -> where the charged lepton in a leptonic W decay is lost Prompt photon-photon production where a photon is lost Dijet Photon+jet production Limits n=4 MD > 0.55 TeV n=6 MD > 0.58 TeV n=8 MD > 0.60 TeV Results Expected background: 11.0  2.3 Observed: 11 EuroGDR, Frascati, Italy November 2004 CDF 5725 PRD Limiting factor was high ET threshold – New in Run II….. L3 has set limit MS >1 TeV for n=2 (hep-ph0003306) Main backgrounds Cosmic rays where muon undergoes a Bremsstrahlung in the calorimeter Irreducible Z+ We (), W (),  (),jet-jet, -jet (+MEt) No signal is observed 95 % C.L. ADD limits: GN-1= 8RnM2+nD MD = 549, 581, 602 GeV n=4,6,8 extra dimensions

  7. q q q qqgGKK dominate sub-process for n>2 q g q g q g g q q GKK GKK GKK qggGKK q q q q q q q q q g q g g g GKK GKK GKK gggGKK g g g g g g g g g g g g GKK GKK GKK from Pythia prediction from Giudice, Rattazi and Wells (hep-ph9811291) G Emission: jet(s)+Et Tevatron s=2 TeV MD = 1.2 TeV n=2 n=4 pTmin (GeV) s falls as 1/MDn+2 for all subprocesses EuroGDR, Frascati, Italy November 2004 CDF 5151 qq-bar  gG is larger for larger values of n, relative to the other sub-processes, since (gggG) and (qggG) depend on (m2/s)4 Whereas (qq-bargG) depends on (m2/s)3 This results in larger splittings at high values of MD between values of n for qg and gggG compared to qq-bargG. For n=2 qq-bar is not the dominate process, but for n>2 then this is the dominate process Dashed lines for  from Pythia Solid lines prediction from Giudice, Rattazi and Wells (hep-ph9811291)

  8. G Emission:jet(s)+ET 84 pb-1 Run Ib Search Selection jet ET1st80 GeV, || <1.1 and ET>80 GeV a second jet is allowed if ET2nd > 30 GeV no isolated tracks in event (pT10 GeV) Main background Z()+jets, W()+jets. Predicted Data Predicted invisible Z Observed (84pb-1) 84  4 pb-1 Results Expected: 27416 Observed: 284 events. Relative uncertainty on the signal acceptance 25 % The fundamental mass scale MD and R are related to Newton’s constant GN-1 and the number of extra dimensions by GN-1= 8RnM2+nD Limits 95 % C.L. upper limit on number of signal events:62 ET (GeV) CDF Run I : Best limits from the Tevatron from searches for direct graviton emission pp  jet +MEt subprocesses: qggG, qq-bargG and gggG. Main bkgd from Z+jet +jet LHC: qggG gives largest contribution Compare to LEP and Delphi results?- in the paper (for that time) EuroGDR, Frascati, Italy November 2004 CDF 5151 Used Poilim (poisson statistics)  Run II CDF search underway! Normalise bkgd predictions to Zee+jets data and use direct normalisation of W->enu+jets as a cross check L3 gives limit Ms > 600 GeV hepph0003306 Allowing a 2nd jet: improves the signal eff. (2nd jet from ISR or FSR) And allows us to estimate the QCD bkgd using data. No tracks; reduces bkgd from W+jets

  9. Missing Et significance cut – why? Z/ Z/ Central Calorimeter Central Calorimeters || < 1 Standard Model Standard Model Extra Dimensions Extra Dimensions Plug Calorimeter Plug Calorimeter 1<||<3 Solenoid l+ l+ l+ l+ l+ l+ COT Time-of-Flight Silicon Tracker l- l- l- l- l- l- G Exchange: ee Search selection 2 two isolated e, ET > 25 GeV 2 central e (CC) or 1 central and 1 forward e (CP) 371 GeV Apply energy dependent cuts for high mass efficiency Overall Identification efficiency: CC: 92.4 ± 0.4% CP: 79.2 ± 0.5% ~12500 candidates Main Backgrounds QCD bkdg: Where jet is misidentified CP categodory contributes most to QCD bkgd Nexp=11.1 Nobs=14 for Mee>300 GeV/c2 Nexp= 4.6 Nobs= 9 for Mee>350 GeV/c2 CDF6343 EuroGDR, Frascati, Italy November 2004 We find good agreement with the Standard Model expectation and thus set an upper limit on the production cross section (times branching ratio) for the production of particles leading to this signature. We do this separately for spin-0, spin-1 and spin-2 particles since the experimental acceptance depends on the spin. We then interpret this cross section limit in terms of physics beyond the Standard Model: Z', RS Gravitons, sneutrino, technicolor, Little Higgs. The main source of background is Drell-Yan. Jets being misidentified as electrons (labelled "QCD") are another important source of background.

  10. G Exchange: mm 7500 mm candidates Search Selection 2 isolated m PT>20 GeV |m1|<1, |m2|<1.5* Veto cosmic rays using track-timing cuts Muon System || < 1 || < 1.5 Nexp=5.2 ± 0.3 Nobs=6 for Mee>300 GeV/c2 Nexp=3.2 ± 0.2 Nobs=1 for Mee>350 GeV/c2 Solenoid Overall Selection efficiency: ~ 70 ± 2 % COT Time-of-Flight *m2 may include tracks w/o m-chamber information Silicon Tracker EuroGDR, Frascati, Italy November 2004 95 % C.L. upperlimits on .BR(G→mm) found in same way as for ee Total of ~ 7500 dimuon candidates in 200 pb-1 data

  11. Which SM diagram dominates at CDF? G Exchange: gg Search Selection 2 isolated g ET>15 GeV 2 central g (CC) Add Photon fake rate plot? Standard Model Extra Dimensions • Backgrounds • Standard Model diphoton production • (dominant at very high masses) • Fakes: -jet and jet-jet, • where jet fragments into a hard p0 Efficiency = 79.0±1.3 % PER PHOTON! Check with RAY 405 GeV/c2 Nexp=4.2±1.0 Nobs=1 for Mee>300 GeV/c2 Nexp=1.5±0.5 Nobs=1 for Mee>350 GeV/c2 Remove efficiencies – have as a back-up EuroGDR, Frascati, Italy November 2004 95 % C.L. upperlimits on .BR(G→) are placed using ± 3 search windows around MG Search selection 2 isolated m ET>15 GeV, ||<1 Add table for expected high mass?

  12. ni i L(/)=i i e ni! L()/(4x10-14 GeV-4) 95 % • 95%= N95% AÕ || (x10-11GeV-4) Extracting G Exchange ll,gg Limits spin-1 Bayesian method with flat prior probability 95 % C.L. upperlimits on .BR(G→) are placed using ± 3 search windows around MG • Observed limit consistent with expectation • Applicable to any new possible future theory 95 % C.L. lower limits on string scale and upperlimits on .BR(G→ll) and are placed using binned likelihood method 1sigma error and 2 sigma error on the expected limit ni : observed events mi= a Nisig + Nibkg (Resonant particles) mi= Nisig() + Nibkg (LED spectrum) Repeat the pseduoexperiment 1000 times. The value of each bin is chosen randomly from Poisson distribution which has the mean value of the expected background. Luminosity (6%) Likelihoods are integrated to give the final limits, taking into account the signal and background systematic uncertainties Sources of systematic uncertainties: Luminosity Acceptance (PDF, MC statistics...) Energy/Momentum scale resolution Selection Efficiencies Background statistics and normalisation N95%=95%Nsig 95 % CL upper limits on sigma*BR for spin-0,1,2 used to set limits (all except LED – limit set using binned likelhood method) EuroGDR, Frascati, Italy November 2004 1and 2  error spin-1 1and 2  error on the expected limit 1) Scan through h, and at each point, reminimise L w.r.t nSM and nBG. 2) Plot L 3) 95 % C.L. result is the value of h such that 95 % of area under the likelihood function lies between it and 0. detector description,..)

  13. G Exchange: jet jet Top R: compare data to expectation – i.e. from Run I Bottom L: do fit Bottom R: compare to expectation Search Selection 2 highest ET jets selected from inclusive jet samples • Fit the mass spectrum with a simple background parameterization and • Search for bumps comparable with the mass resolution. No significant evidence for a new particle EuroGDR, Frascati, Italy November 2004 The fit on a log scale ( eps, ps, gif), the fractional difference between the data and the fit ( eps, ps, gif), and the statistical residuals between the data and the fit ( eps, ps, gif), show there is no significant evidence for a new particle signal.

  14. ee ADD ee Limits Add plot for CC+CP? On website? Also fix links? • systematics /efficiencies? Set a limit on the effective Planck scale (Ms4) using invariant mass spectrum (1D fit) Generate MC templates for each piece independent of the choice of  and Ms4. Parameterise the cross section in terms of h=/ Ms4, where =±1 (Hewett)s = sSM+ h sINT + h2 sKK A 3 parameter (nSM, nBG,h) unbinned likelihood function is used to extract h 987 959 D0 1.28 GeV (GRW) 128 pb-1 ee/ CDF Run I: 780 768 EuroGDR, Frascati, Italy November 2004 Gupta et. al. hep-ph/9904234 Same as D0 dielectron limits – but their diEM better

  15. l- q l- q l- g /Z0 KKn KKn + + q l+ q g l+ l+ RS Graviton Limits Dilepton Channel 470 GeV/c2  620 GeV/c2 gg initiated process  Clean experimental signature. Low backgrounds ee K/Mpl 0.1 620 0.05 470 0.02 310 0.01 200 jetjet 75pb-1 exclude 220-840 GeV: k/MPl=0.3 for k/M_Pl=0.05 masses less than 500 GeV are ruled out at 95% C.L.. EuroGDR, Frascati, Italy November 2004 Randall-Sundrum gravitons are excluded by these data in the plane of coupling (k/MPl) versus effective graviton mass. E.g. for k/M_Pl=0.05 masses less than 500 GeV are ruled out at 95% C.L.. ee has largest acceptance at low mass has largest acceptance at high mass BR(G→) = 2 * BR(G→ee) Add Run I limits?! Scale of physical phenomena on the TeV-brane is specified by the exponential warp factor: = Mple-kRc ~ TeV if kRc ~11-12. Scale of physical phenomena on the TeV-brane is specified by the exponential warp factor: = Mple-kRc BR(G→) = 2 * BR(G→ee) ~ TeV if kRc~11-12.

  16. Angular Distributions: ee 1-D fits performed, but also study angular distributions cos* in Collins-Soper frame Good agreement with SM prediction EuroGDR, Frascati, Italy November 2004 can I say that these are … - what deviations would we expect though?! Results consistent with the background

  17. Angular Distributions: mm & gg cos* in Collins-Soper frame mm gg EuroGDR, Frascati, Italy November 2004 can I say that these are … - what deviations would we expect though?! Results consistent with the background Not used in limits – but still studied

  18. Summary and Outlook • Searches for ED have been performed in many channels at CDF • No evidence of deviations from Standard Model expectation observed • Best limits obtained ADD jets+ET, ee +  ~ 1 TeV RS gg (345pb-1)m1 ~ 220 to 690 GeV for k/MPl 0.01 to 0.1 ee +  (200pb-1) m1 ~ 200 to 700 GeV for k/MPl 0.01 to 0.1 • Many new results and publications on their way…. • ee PP search • ZZ channel • Tevatron Run IIa (2 fb-1) has a promising observation potential and should be in a position to discover ED, if they exist, ADD: up to about MS = 2 TeV RS: m1 from 0.5 to1 TeV for k/MPl 0.01 to 0.1 • Look out for CDF results! EuroGDR, Frascati, Italy November 2004 • The highest limits obtained are from the ** channel. • Many interesting channels to look in. • Run II results already coming in • To be updated in the future… ADD ee +  939 (853) GeV for =-1 (+1), KLED = 1.3 ADD jets+ET 995 for n=2, 768 for n=4 RS ee 205 to 535 GeV for k/MPl 0.025 to 0.1 • Tevatron Run II has a promising observation potential and should be in a position to discover ED, if they exist, ADD: up to about MS = 2 to 3 TeV (Runs IIa, 2 fb-1; IIb, 20 fb-1) RS: m1 from 0.5 to 1 TeV for k/MPl 0.01 to 0.1 (Run IIa, 2 fb-1)

  19. ee(PP): Comparison to Expectation New for Run II: Plug ee increase acceptance! Search selection 2 two isolated e, ET > 25 GeV 2 forward e (PP) 371 GeV Main Non-Drell-Yan Background QCD dijets: jet is misidentified Larger effect in the plug region than in central Typical CC event PP Nexp=2.7 ± 0.7 Nobs=8 for Mee>300 GeV/c2 Nexp=1.4 ± 0.3 Nobs=3 for Mee>350 GeV/c2 limits being obtained! CDF6343 EuroGDR, Frascati, Italy November 2004 We find good agreement with the Standard Model expectation and thus set an upper limit on the production cross section (times branching ratio) for the production of particles leading to this signature. We do this separately for spin-0, spin-1 and spin-2 particles since the experimental acceptance depends on the spin. We then interpret this cross section limit in terms of physics beyond the Standard Model: Z', RS Gravitons, sneutrino, technicolor, Little Higgs. The main source of background is Drell-Yan. Jets being misidentified as electrons (labelled "QCD") are another important source of background. Good agreement with SM prediction

  20. Summary and Outlook • Searches for ED have been performed in many channels at CDF • No evidence of deviations from Standard Model expectation observed • Best limits obtained ADD jets+ET, ee +  ~ 1 TeV RS gg (345pb-1)m1 ~ 220 to 690 GeV for k/MPl 0.01 to 0.1 ee +  (200pb-1) m1 ~ 200 to 700 GeV for k/MPl 0.01 to 0.1 • Many new results and publications on their way…. • ee PP search • ZZ channel • Tevatron Run IIa (2 fb-1) has a promising observation potential and should be in a position to discover ED, if they exist, ADD: up to about MS = 2 TeV RS: m1 from 0.5 to1 TeV for k/MPl 0.01 to 0.1 • Look out for CDF results! EuroGDR, Frascati, Italy November 2004 • The highest limits obtained are from the ** channel. • Many interesting channels to look in. • Run II results already coming in • To be updated in the future… ADD ee +  939 (853) GeV for =-1 (+1), KLED = 1.3 ADD jets+ET 995 for n=2, 768 for n=4 RS ee 205 to 535 GeV for k/MPl 0.025 to 0.1 • Tevatron Run II has a promising observation potential and should be in a position to discover ED, if they exist, ADD: up to about MS = 2 to 3 TeV (Runs IIa, 2 fb-1; IIb, 20 fb-1) RS: m1 from 0.5 to 1 TeV for k/MPl 0.01 to 0.1 (Run IIa, 2 fb-1)

  21. Spin-0 Dilepton Limits RP sneutrino l+   `  l- ` : square of coupling to initial state x BR = proportional to the cross-section 2xBR ee EuroGDR, Frascati, Italy November 2004

  22. Spin-1 Dilepton Limits Z' bosons CDF Run L(pb-1) Mass Limit @ 95 % Z' SM eemm Run IA(92-93) 20 505 Run IB(94-94) 90 640 590 IIA (winter 04) 200 750 735 • Sequential Z`: Reference model • with SM-like couplings to fermions • Free parameter M(Z`) Run I limits exceeded! E6 Z' Technicolor • E6 Model Z`:del Aguilia et al., Nuc Phys B287 (87) • Unification of strong and EWK forces at GUT • E6→(SO(10)→SU(5)xU(1))xU(1) • Z` = Z sinE6 + Z cosE6 • Z,ZIE6 = sin-1√3/8, sin-1√5/8 RPV sneutrinos EuroGDR, Frascati, Italy November 2004

  23. Spin-1 Dilepton Limits Little Higgs Z' Solve fine-tuning and hierarchy by canceling divergences of Higgs mass SU(2) ZH coupling parameter cot mm Technicolor First limits set! Littlest Higgs ZH (→ee) M(ZH)>800 GeV/c2 for cot=1.0 M(ZH)>755 GeV/c2 for cot=0.9 RPV sneutrinos Arkani-Hamed, Cohen, Georgi, Phys. Lett. B 513, 232, 2001 Han, Logan, McElrath, Wang, Phys. Rev. D 67, 095004, 2003 EuroGDR, Frascati, Italy November 2004

  24. Spin-1 Dilepton Limits Technicolor EuroGDR, Frascati, Italy November 2004

  25. Spin-dependent Acceptance Angular distribution and therefore acceptance of decay products depends on the spin of the decaying particle. spin-0 spin-1 spin-2 EuroGDR, Frascati, Italy November 2004 The following plots show the efficiency times acceptance of detecting a particle decaying into a electron-positron pair as function of the mass. Since the spin of the particle changes the angular distribution of the decay particles we consider the possible spin of any new particle separately: spin-0 , spin-1 and spin-2.

  26. h<1 h<1 Plug h < 2.4 h < 2.4 CDF  Run I search for LED Search Selection 2  with Et > 22 GeV, CC or CP: central (|| < 1), plug (1<|| <2.4) Main backgrounds: fakes from -jet and jet-jet Results Observed: 287 Central Central events 192 Central Plug events Limits Using a maximum likelihood fit method CC 100 pb-1, CP 87 pb-1 2 separate analyses – CP and CC – then combined to give: 95 % C.L. MS > 899 / 797 GeV KLED = 1.0 ( = -1/+1, Hewett) MC distribution for the excluded signal shown here too Central Background falls off faster than signal. In CC above 200 GeV: Expect less than 0.2 events, as opposed to 2.5 SM gg events Mgghighest = 288 GeV/c2 EuroGDR, Frascati, Italy November 2004 CDF5694 CDF: M > 150 GeV 5 events are observed where 4.5 +/-0.6 were expected with luminosity 100 pb-1 , and a limit MS > 0.9 TeV for n=4 was obtained. (hepph0003306) Problems gg interference –

  27. CDF Run I ee search for LED 2 high Et isolated electrons(> 25 GeV)(CC and CP) Main Backgrounds: Drell-Yan, QCD di-jet, diboson production, Z,tt-bar production CC: 3319 CP: 3825 NSMCP = 3883  292 (DY) NBGCP = 224  71 Observed 3825 500 GeV NSMCC = 3463  223 (DY) 95 % C.L. MS > 780 / 768 GeV KLED = 1.0 95 % C.L. MS > 826 / 808 GeV KLED = 1.3 ( = -1/+1, Hewett) CDF 5892 EuroGDR, Frascati, Italy November 2004 Highest energy event is 500 GeV 2 separate analyses – CP and CC – then combined to give: 110 7 pb-1 KLED applies to the LED terms of the cross section, and to date (March 2002) has not been theoretically estimated. Therefore quote a SM-like K-factor result and also one where no loop corrections are assumed. ee and  CDF results cdf 5753 95 % C.L. MS > 826 / 905 GeV ( = +1/-1, Hewett) KLED = 1.0 95 % C.L. MS > 853 / 939 GeV ( = +1/-1, Hewett) KLED = 1.3

  28. Tevatron 110 pb-1 Dijet and dilepton data 2 fb-1 Curvature of 5th dimension |R5| < M52 K/MPl  < 10 TeV Solve hierarchy LHC 10 fb-1 Dilepton data Oblique Parameters Diphoton data 2 fb-1 constraints RS 0.20 0.10 0.07 0.05 0.03 0.02 0.01 Allowed Region m1 : 700-1150 GeV 1000 2000 3000 4000 5000 m1 (GeV) Davoudiasl, Hewett, Rizzo hep-ph 0006041 Sridhar hep-ph 0103055 EuroGDR, Frascati, Italy November 2004

  29. Run II a, b 0.1 0.08 0.06 0.04 0.02 K/MPl s = 14 TeV L = 100fb-1 1000 1100 1200 1300 1400 m0 (GeV) |g|<1.2 for both g |g|<2.5 for both g Using (KLED=1.3) for full s Diphoton constraints RS Tevatron LHC ADD K factor for both and ref and add bin sizes And know method – xhi Squ !? 0.1 0.08 0.06 0.04 0.02 K/MPl s = 2 TeV L = 2fb-1 200 220 240 260 280 95 % C.L. 95 % C.L. m0 (GeV) m1 : 700-1150 GeV m1 : 3.5-5.5 TeV hep-ph 0103055 EuroGDR, Frascati, Italy November 2004 LHC: can probe first graviton excitation up to ~ 3.5-5.5 TeV Diphoton production at Tevatron Run II sensitive to mass of first KK graviton resonance (m1) : 700-1150 GeV implies mass of first KK graviton resonance must lie above 700 GeV For K/MPl 0.01 to 0.1 95 % C.L. m0 Tevatron: 180-290 GeV

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