1. work with M. Carena, E. Pontón, C. Wagner NPB (06) [ph/0607106] and hep-ph/0701055 + work in progress Phenomenology of Warped Models with Custodial Symmetry José Santiago Fermilab Budapest, June 27, 2007

2. Outline Motivation (... hope you were at Eduardo’s talk!) Motivation (... hope you were at Eduardo’s talk!) What to expect: What to expect: Bosonic spectrum Bosonic spectrum Fermionic spectrum Fermionic spectrum Capturing the essentials: SM + vector-like quarks Capturing the essentials: SM + vector-like quarks The model: Bidoublets and singlets The model: Bidoublets and singlets Low energy effects and decay channels Low energy effects and decay channels Phenomenological implications: Phenomenological implications: Fermion discovery Fermion discovery Implications for Higgs physics Implications for Higgs physics Vector boson discovery Vector boson discovery Conclusions Conclusions

3. Motivation Warped models with custodial symmetry: Warped models with custodial symmetry: Natural theory of EWSB Natural theory of EWSB Compelling theory of flavor Compelling theory of flavor Realistic models (custodial protection of Zbb) have very characteristic spectrum Realistic models (custodial protection of Zbb) have very characteristic spectrum Randall-Sundrum phenomenology revisited: Randall-Sundrum phenomenology revisited: New vector-like fermions New vector-like fermions Discovery of the fingerprints of custodial protection Discovery of the fingerprints of custodial protection Implications for Higgs physics Implications for Higgs physics Implications for discovery of vector resonances Implications for discovery of vector resonances Agashe, Delgado, May, Sundrum JHEP (03) Agashe, Contino, Da Rold, Pomarol PLB (06)

4. What to expect? Bosonic spectrum Bosonic spectrum Tower of bosonic resonances Tower of bosonic resonances Fermionic spectrum Fermionic spectrum Naturalness (cancellation of top loops) and custodial protection of Zbb predict light quarks with well defined quantum numbers that mix strongly with third generation quarks Naturalness (cancellation of top loops) and custodial protection of Zbb predict light quarks with well defined quantum numbers that mix strongly with third generation quarks Carena, Pontón, J.S., Wagner NPB(06) + hep-ph/0701055

5. What to expect? Bosonic spectrum Bosonic spectrum Tower of bosonic resonances Tower of bosonic resonances Fermionic spectrum Fermionic spectrum Naturalness (cancellation of top loops) and custodial protection of Zbb predict light quarks with well defined quantum numbers that mix strongly with third generation quarks Naturalness (cancellation of top loops) and custodial protection of Zbb predict light quarks with well defined quantum numbers that mix strongly with third generation quarks

6. Capturing the essentials Extend the SM with the relevant vector-like quarks Extend the SM with the relevant vector-like quarks With mass matrix (assume no mixing to b) With mass matrix (assume no mixing to b)

7. Capturing the essentials Extend the SM with the relevant vector-like quarks Extend the SM with the relevant vector-like quarks With mass matrix (assume no mixing to b) With mass matrix (assume no mixing to b)

8. Capturing the essentials Extend the SM with the relevant vector-like quarks Extend the SM with the relevant vector-like quarks With mass matrix (assume no mixing to b) With mass matrix (assume no mixing to b)

9. Low Energy Effects Top (bottom) couplings Top (bottom) couplings

10. Low Energy Effects Top (bottom) couplings Top (bottom) couplings Particular (but well motivated) limit: degenerate bidoublet and heavy singlet Suppressed low energy effects!!

11. Main Decay Channels Singlet Singlet Non-degenerate bidoublet Non-degenerate bidoublet Charge 2/3 Charge 2/3 Charges 5/3 and -1/3 Charges 5/3 and -1/3

12. Main Decay Channels Singlet Singlet Non-degenerate bidoublet Non-degenerate bidoublet Charge 2/3 Charge 2/3 Charges 5/3 and -1/3 Charges 5/3 and -1/3

13. Phenomenological implications (I) Vector-like quark discovery Vector-like quark discovery T has been extensively studied (recently in LH models) T has been extensively studied (recently in LH models) Bidoublets have been less studied (but are far more interesting!) Bidoublets have been less studied (but are far more interesting!) Exotic decay channels Exotic decay channels Large BR of charge 2/3 into Z Large BR of charge 2/3 into Z Dennis, Ünel, Servant, Tseng ‘07

14. Phenomenological implications (II) Implications for Higgs physics Implications for Higgs physics Top Yukawa reduced due to mixing Top Yukawa reduced due to mixing Reduction of gluon fusion Higgs production Reduction of gluon fusion Higgs production Small enhancement of (not enough to compensate for the decrease in gluon fusion) Small enhancement of (not enough to compensate for the decrease in gluon fusion) Recall vector-like quark masses (mostly) not from EWSB small contribution to gluon fusion

15. Phenomenological implications (II) Implications for Higgs physics Implications for Higgs physics But new (strong) production mechanisms through decay of vector-like quarks (with large BR into Higgs) But new (strong) production mechanisms through decay of vector-like quarks (with large BR into Higgs)

16. Phenomenological implications (II) Implications for Higgs physics Implications for Higgs physics But new (strong) production mechanisms through decay of vector-like quarks (with large BR into Higgs) But new (strong) production mechanisms through decay of vector-like quarks (with large BR into Higgs) Aguilar-Saavedra JHEP (06) 8 fb -1 5σ Higgs discovery for m H =115 GeV a vector-like singlet T with M T =500 GeV 8 fb -1 can allow for a 5σ Higgs discovery for m H =115 GeV and a vector-like singlet T with M T =500 GeV Better prospects for bidoublets!

17. Phenomenological implications (III) Discovery of KK gluons Discovery of KK gluons Studies done assuming gluons decay only to (RH) tops Studies done assuming gluons decay only to (RH) tops Very hard tops, p T ~TeV, difficult to reconstruct (top jets) Very hard tops, p T ~TeV, difficult to reconstruct (top jets) Realistic models have a richer structure (new decay channels open) Realistic models have a richer structure (new decay channels open) Not all tops come directly from the KK gluon (can miss peak) Not all tops come directly from the KK gluon (can miss peak) New decays produce softer tops (easier to reconstruct) New decays produce softer tops (easier to reconstruct) If light bidoublets: large number of fermions with strong coupling to KK gluons very wide resonance (BKTs probably necessary) If light bidoublets: large number of fermions with strong coupling to KK gluons very wide resonance (BKTs probably necessary) Agashe, Belyaev, Krupovnickas, Perez, Virzi ph/0612015 Lillie, Randall, Wang ph/0701166 Lillie, Su, Tait, to appear

18. Phenomenological implications (III) Discovery of KK gluons Discovery of KK gluons

19. Phenomenological implications (III) Discovery of KK gluons Discovery of KK gluons

20. Phenomenological implications (III) Discovery of KK gluons Discovery of KK gluons

21. Conclusions Realistic models with warped extra dimensions have a very rich fermionic spectrum Realistic models with warped extra dimensions have a very rich fermionic spectrum SM+ vector-like quarks captures the main features SM+ vector-like quarks captures the main features Time to revisit RS phenomenology Time to revisit RS phenomenology New fermions as fingerprints of custodial symmetry New fermions as fingerprints of custodial symmetry Implications for Higgs physics Implications for Higgs physics Implications for the discovery of bosonic resonances Implications for the discovery of bosonic resonances