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"
26-31 May 2013

2. Sergio Grancagnolo - HU-Berlin
Extra Dimensions
Arkani-Hamed, Dimopoulos, Dvali (ADD)
Gravity propagate in (4+n)-dimensional space, SM confined
Fundamental MD Planck scale
Size of extra dimensions R
Randall-Sundrum invokes extra dim with curvature k
Predicts excited Kaluza-Klein modes of the graviton
Appear as spin-2 resonances, first excitation G*
Intrinsic narrow G* width when k=k/MPl<0.1
Quantum black holes with n=1
Narrow intrinsic width when k/MPl<0.1
Curvature of the warped extra-dimension k
Reduced Plank mass MPl = MPl/sqrt(8)
26-31 May 2013
Sergio Grancagnolo - HU-Berlin

3. Sergio Grancagnolo - HU-Berlin
Extra Dimensions
Resonant diboson production WW, ZZ
Dilepton resonances ee, μμ
tt resonances in lepton+jets final states
Resonances in bb and bg final states
Monojet and missing energy
Microscopic black holes in multiparticle events
26-31 May 2013
Sergio Grancagnolo - HU-Berlin

4. Resonant diboson
k=0.1 G*→WW (bulk)
MG*<940 (710) GeV
ATLAS arXiv:
Bulk: the fermion and boson fields of the SM are free to propagate into the extra dimension
k=1 bulk G*→ZZ MG*<850 GeV
k=0.1 G*→ZZ (bulk) MG*<945 (720) GeV
CMS
/j.physletb
ATLAS
ATLAS-CONF
26-31 May 2013
Sergio Grancagnolo - HU-Berlin

5. Sergio Grancagnolo - HU-Berlin
Dilepton resonances
ATLAS-CONF
lk=0.1
MG*<2.47TeV
CMS Kaluza–Klein gravitons lighter than 2390 (2030) GeV, assuming that the coupling parameter k/MPl is 0.10 (0.05)
k=0.1
MG*<2.39TeV
CMS
/j.physletb
26-31 May 2013
Sergio Grancagnolo - HU-Berlin

6. Monojet and missing energy
CMS
CMS-PAS-EXO
qg→qG, gg→gG, qq→gG
Not interacting gravitons
ATLAS
arXiv:
26-31 May 2013
Sergio Grancagnolo - HU-Berlin

7. Microscopic black holes
CMS
arXiv:
26-31 May 2013
Sergio Grancagnolo - HU-Berlin

8. Sergio Grancagnolo - HU-Berlin
Resonances in bb and bg
CMS
CMS-PAS-EXO
Lk=0.1, fbb=0.1
1.42<MG*<1.57TeV
26-31 May 2013
Sergio Grancagnolo - HU-Berlin

9. tt resonances (l+jets)
ATLAS arXiv:
to be updated if approved
ГgKK/mgKK=15.3%
0.7<mgKK<2.07TeV
ГgKK/mgKK=15.3%
0.7<mgKK<2.07TeV
CMS-PAS-EXO
1.0<mgKK<1.98TeV
26-31 May 2013
Sergio Grancagnolo - HU-Berlin

10. Same-sign dilepton searches
ATLAS ATLAS-CONF
2UED/RPP
MgKK<0.9TeV
two universal extra dimension under the real projective plane geometry (2UED/RPP)
In this model both extradimensions have same size R4=R5
This model predicts the pair production of Kaluza-
Klein excitations of the photon with mass √2mKK, each of them decaying to tt, with a branching fraction assumed to be 100%. Cosmological observations constrain mKK to lie approximately between 600 GeV and 1000 GeV.
CMS
CMS-PAS-B2G
26-31 May 2013
Sergio Grancagnolo - HU-Berlin

11. Sergio Grancagnolo - HU-Berlin
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
26-31 May 2013
Sergio Grancagnolo - HU-Berlin

12. Second generation Channels: μμ + ≥2jets μ + ET + ≥2jets
CMS
CMS-PAS-EXO
Assuming BR(LQ→μq)=100% (50%)
MLQ<1070 (785) GeV
Assuming BR(LQ→μq)=100% (50%)
MLQ<685 (594) GeV
ATLAS
EPJ C72 (2012) 2151
26-31 May 2013
Sergio Grancagnolo - HU-Berlin

13. Third generation ATLAS 4.7fb-1@7TeV arXiv:1303.0526
Assuming BR(LQ→τb)=100% : MLQ<534 GeV
Assuming BR(LQ→τb)=100% : MLQ<525 GeV
Assuming SU(5) vector leptoquarks : MVLQ<760 GeV
CMS
/JHEP12(2012)055
26-31 May 2013
Sergio Grancagnolo - HU-Berlin

14. Sergio Grancagnolo - HU-Berlin
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
26-31 May 2013
Sergio Grancagnolo - HU-Berlin

15. Resonant WZ ATLAS 13fb-1@8TeV ATLAS-CONF-2013-015 MρT<920 GeV
CMS
/PhysRevLett
Assuming MπT=3/4MρT-25GeV : 167<MρT<687 GeV
Assuming MρT<MπT+MW : 180<MρT<938 GeV
26-31 May 2013
Sergio Grancagnolo - HU-Berlin

16. Sergio Grancagnolo - HU-Berlin
topcolor
ATLAS
arXiv:
CMS
CMS-PAS-EXO
to be updated if approved
0.5<MZ'<1.74 TeV
1.0<MZ'<1.98 TeV
26-31 May 2013
Sergio Grancagnolo - HU-Berlin