Searches for Extra Dimensions, Leptoquarks, and Technicolor at the LHC

Transcription

1 Searches for Extra Dimensions, Leptoquarks, and Technicolor at the LHC Sergio Grancagnolo Humboldt-Universitaet zu Berlin Rencontres de Blois on "Particle Physics and Cosmology"

2 Extra Dimensions Arkani-Hamed, Dimopoulos, Dvali (ADD) Randall-Sundrum invokes extra dim with curvature k Gravity propagate in (4+n)dimensional space, SM confined Predicts excited Kaluza-Klein modes of the graviton Fundamental MD Planck scale Size of extra dimensions R Appear as spin-2 resonances, first excitation G* Intrinsic narrow G* width when k=k/mpl<0.1 Extension to SM fields propagating in the bulk extra dimensions (bulk RS) Quantum black holes with n=1 2

3 Extra Dimensions Resonant diboson production WW, ZZ Dilepton resonances ee, μμ, and same-sign Monojet and missing energy Microscopic black holes in multiparticle events Resonances in bb and bg final states tt resonances in lepton+jets and all hadronic final states 3

4 Resonant diboson ATLAS arxiv: G* ZZ lljj k=0.1 RS1 (k=0.5 bulk) MG*<945 (610) GeV -1 CMS fb /j.physletb G* WW lvjj spin-2 RS1 (bulk RS) MG*<940 (710) GeV WZ lvjj MW'<950 GeV k=1 bulk G* ZZ lljj MG*<850 GeV ATLAS 4 ATLAS-CONF

5 Dilepton resonances ee, μμ combined k=0.1 RS1 MG*<2.47TeV ATLAS-CONF k= MayRS CMS-PAS-EXO CMS-PAS-EXO Sergio Grancagnolo - HU-Berlin MG*<2.39TeV /j.physletb

6 Monojet and missing energy -1 qg qg, gg gg, qq gg Not interacting gravitons CMS CMS-PAS-EXO ATLAS ATLAS-CONF

7 Microscopic black holes CMS arxiv:

8 Resonances in bb and bg CMS CMS-PAS-EXO k=0.1, fbb= <MG*<1.57TeV L 8

9 tt resonances (l+jets) ATLAS-CONF CMS-PAS-B2G

10 tt resonances (l+jets) ATLAS-CONF ГgKK/mgKK=15.3% bulk RS 0.5<mgKK<2.0TeV CMS-PAS-B2G Different parameter model: broader and larger x-sec bulk RS mgkk<2.54tev Lillie et al. arxiv:hep-ph/ v1 10 Agashe et al. Phys. Rev. D77 (2008)015003

11 tt resonances (all hadronic) ATLAS JHEP01(2013)116 CMS-PAS-B2G ГgKK/mgKK=15.3% bulk RS 0.7<mgKK<1.62TeV Different parameter model: broader and larger x-sec bulk RS mgkk<1.8tev Lillie et al. arxiv:hep-ph/ v1 11 Agashe et al. Phys. Rev. D77 (2008)015003

12 Same-sign dilepton searches ATLAS ATLAS-CONF Different CMS models CMS-PAS-B2G dim UED, 2UED/RPP MgKK<0.9TeV 12

13 Leptoquarks Second generation scalar leptoquark Two muons and at least two jets One muon, at least two jets and missing energy Third generation leptoquark b-jet and τ lepton Pair production assumed One τ decaying hadronically, the other leptonically One lepton (e or μ), large missing energy, 2 jets 13

14 Second generation Channels: μμ + 2jets μ + ET + 2jets CMS 19.6fb-1@8TeV CMS-PAS-EXO Assuming BR(LQ μq)=100% (50%) MLQ<1070 (785) GeV Assuming BR(LQ μq)=100% (50%) ATLAS 1.03fb-1@7TeV MLQ<685 (594) GeV EPJ C72 (2012)

15 Third generation ATLAS arxiv: Assuming BR(LQ τb)=100% : MLQ<534 GeV -1 Assuming BR(LQ τb)=100% : MLQ<525 GeV CMS Assuming SU(5) vector leptoquarks : MVLQ<760 GeV /JHEP12(2012)055 15

16 Technicolor Resonant WZ Low Scale Technicolor (LSCT) viable option for EWSB Narrow widths technimesons to WZ Lightest vector technirho, axial-vector techni-a Specific assumptions on mass hierarchy and mixing with electroweak gauge bosons Leptophobic topcolor, narrow resonance Z' BR(Z' tt)=33% for masses > 700 GeV 16

17 Resonant WZ lvll ATLAS ATLAS-CONF WZ lvll MW'<1180 GeV MρT<920 GeV MρT = MπT + MW sinχ =1/3 CMS 5fb-1@7TeV /PhysRevLett Assuming MπT=3/4MρT-25GeV : 167<MρT<687 GeV Assuming Mρ <Mπ +MW T T 17 : 180<Mρ <938 GeV T

18 topcolor (l+jets) CMS CMS-PAS-B2G ATLAS ATLAS-CONF % width MZ'<2.1 TeV 1.2% width 0.5<MZ'<1.8 TeV 10% width MZ'<2.7 TeV 18

19 topcolor (all hadronic) ATLAS JHEP01(2013)116 CMS-PAS-B2G % width MZ'<2.1 TeV 1.2% width 0.7<MZ'<1 TeV, 1.28<MZ'<1.32 TeV 10% width MZ'<2.7 TeV 19

20 Conclusions ATLAS and CMS are running many searches in different channels Presented last results on extra-dimensions, leptoquarks and technicolors No evidence of new signal after SM was observed Full dataset not yet fully exploited Stay tuned for next results, while waiting for the restart after the first long shutdown! 20

21 References arxiv: ATLAS-CONF /j.physletb CMS-PAS-B2G ATLAS-CONF CMS-PAS-EXO ATLAS-CONF EPJ C72 (2012) /j.physletb arxiv: CMS-PAS-EXO /JHEP12(2012)055 arxiv: ATLAS-CONF arxiv: /PhysRevLett CMS-PAS-EXO arxiv: arxiv: CMS-PAS-EXO CMS-PAS-EXO JHEP11(2012)138 ATLAS-CONF CMS-PAS-EXO

22 Backup 22

23 LSCT limits in dilepton ATLAS JHEP11(2012)138 Mρ = Mπ + MW T Different CMS 20.6fb-1@8TeV models CMS-PAS-EXO T MρT<85LSCT0 GeV 23

24 KK resonances in tt ATLAS arxiv: ATLAS-CONF ГgKK/mgKK=15.3% bulk RS 0.7<mgKK<2.07TeV 0.5<mgKK<2.0TeV 24