phenomenology of warped models with custodial symmetry
DESCRIPTION
Phenomenology of Warped Models with Custodial Symmetry. José Santiago Fermilab. Budapest, June 27, 2007. Outline. Motivation (... hope you were at Eduardo’s talk!) What to expect: Bosonic spectrum Fermionic spectrum Capturing the essentials: SM + vector-like quarks - PowerPoint PPT PresentationTRANSCRIPT
work with M. Carena, E. Pontón, C. Wagner
NPB (06) [ph/0607106]
and hep-ph/0701055
+ work in progress
Phenomenology of Warped Models Phenomenology of Warped Models with Custodial Symmetrywith Custodial Symmetry
José SantiagoJosé Santiago
FermilabFermilab
Budapest, June 27, 2007
OutlineOutline
Motivation (... hope you were at Eduardo’s talk!)Motivation (... hope you were at Eduardo’s talk!) What to expect: What to expect:
Bosonic spectrumBosonic spectrum Fermionic spectrumFermionic spectrum
Capturing the essentials: Capturing the essentials: SM + vector-like quarksSM + vector-like quarks The model: Bidoublets and singletsThe model: Bidoublets and singlets Low energy effects and decay channelsLow energy effects and decay channels
Phenomenological implications:Phenomenological implications: Fermion discoveryFermion discovery Implications for Higgs physicsImplications for Higgs physics Vector boson discoveryVector boson discovery
ConclusionsConclusions
MotivationMotivation
Warped models with custodial symmetry:Warped models with custodial symmetry: Natural theory of EWSBNatural theory of EWSB Compelling theory of flavorCompelling theory of flavor Realistic models (custodial protection of Zbb) have Realistic models (custodial protection of Zbb) have
very characteristic spectrumvery characteristic spectrum
Randall-Sundrum phenomenology revisited:Randall-Sundrum phenomenology revisited: New vector-like fermionsNew vector-like fermions
Discovery of the fingerprints of custodial protectionDiscovery of the fingerprints of custodial protection Implications for Higgs physicsImplications for Higgs physics Implications for discovery of vector resonancesImplications for discovery of vector resonances
Agashe, Delgado, May, Sundrum JHEP (03)
Agashe, Contino, Da Rold, Pomarol PLB (06)
What to expect?What to expect?
Bosonic spectrumBosonic spectrum Tower of bosonic resonancesTower of bosonic resonances
Fermionic spectrumFermionic spectrum NaturalnessNaturalness (cancellation of top loops) and (cancellation of top loops) and
custodial protection of Zbbcustodial protection of Zbb predict predict light quarkslight quarks with well defined with well defined quantum numbersquantum numbers that that mixmix strongly strongly with third generation quarkswith third generation quarks
Carena, Pontón, J.S., Wagner NPB(06) + hep-ph/0701055
What to expect?What to expect?
Bosonic spectrumBosonic spectrum Tower of bosonic resonancesTower of bosonic resonances
Fermionic spectrumFermionic spectrum NaturalnessNaturalness (cancellation of top loops) and (cancellation of top loops) and
custodial protection of Zbbcustodial protection of Zbb predict predict light quarkslight quarks with well defined with well defined quantum numbersquantum numbers that that mixmix strongly strongly with third generation quarkswith third generation quarks
Capturing the essentialsCapturing the essentials
Extend the SM with the relevant vector-like Extend the SM with the relevant vector-like quarksquarks
With mass matrix (assume no mixing to b)With mass matrix (assume no mixing to b)
Capturing the essentialsCapturing the essentials
Extend the SM with the relevant vector-like Extend the SM with the relevant vector-like quarksquarks
With mass matrix (assume no mixing to b)With mass matrix (assume no mixing to b)
Capturing the essentialsCapturing the essentials
Extend the SM with the relevant vector-like Extend the SM with the relevant vector-like quarksquarks
With mass matrix (assume no mixing to b)With mass matrix (assume no mixing to b)
Low Energy EffectsLow Energy Effects
Top (bottom) couplingsTop (bottom) couplings
Low Energy EffectsLow Energy Effects
Top (bottom) couplingsTop (bottom) couplingsParticular (but well motivated) limit: degenerate bidoublet and heavy singlet
Suppressed low energy effects!!
Main Decay ChannelsMain Decay Channels
SingletSinglet
Non-degenerate bidoubletNon-degenerate bidoublet Charge 2/3Charge 2/3
Charges 5/3 and -1/3Charges 5/3 and -1/3
Main Decay ChannelsMain Decay Channels
SingletSinglet
Non-degenerate bidoubletNon-degenerate bidoublet Charge 2/3Charge 2/3
Charges 5/3 and -1/3Charges 5/3 and -1/3
Phenomenological implications (I)Phenomenological implications (I)
Vector-like quark discoveryVector-like quark discovery T has been extensively studied (recently in LH T has been extensively studied (recently in LH
models)models)
Bidoublets have been less studied (but are far Bidoublets have been less studied (but are far more interesting!)more interesting!)
Exotic decay channelsExotic decay channels
Large BR of charge 2/3 into Z Large BR of charge 2/3 into Z
Dennis, Ünel, Servant, Tseng ‘07
Phenomenological implications (II)Phenomenological implications (II)
Implications for Higgs physicsImplications for Higgs physics Top Yukawa reduced due to mixingTop Yukawa reduced due to mixing
Reduction of gluon fusion Higgs productionReduction of gluon fusion Higgs production
Small enhancement of (not enough to compensate Small enhancement of (not enough to compensate for the decrease in gluon fusion) for the decrease in gluon fusion)
Recall vector-like quark masses (mostly) not from EWSB small contribution to gluon fusion
Phenomenological implications (II)Phenomenological implications (II)
Implications for Higgs physicsImplications for Higgs physics But new (strong) production mechanisms through But new (strong) production mechanisms through
decay of vector-like quarks (with large BR into decay of vector-like quarks (with large BR into Higgs)Higgs)
Phenomenological implications (II)Phenomenological implications (II)
Implications for Higgs physicsImplications for Higgs physics But new (strong) production mechanisms through But new (strong) production mechanisms through
decay of vector-like quarks (with large BR into decay of vector-like quarks (with large BR into Higgs)Higgs)
Aguilar-Saavedra JHEP (06)
8 fb8 fb-1-1 can allow for a 55σσ Higgs discovery for mHiggs discovery for mHH=115 =115 GeVGeV and a vector-like singlet a vector-like singlet T with MT with MTT=500 GeV=500 GeV
Better prospects for bidoublets!
Phenomenological implications (III)Phenomenological implications (III)
Discovery of KK gluonsDiscovery of KK gluons Studies done assuming gluons decay only to (RH) Studies done assuming gluons decay only to (RH)
topstops Very hard tops, pVery hard tops, pTT~TeV, difficult to reconstruct (~TeV, difficult to reconstruct (top jetstop jets))
Realistic models have a richer structure (new decay Realistic models have a richer structure (new decay channels open)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 If light bidoublets: large number of fermions with strong
coupling to KK gluons very wide resonance (BKTs coupling to KK gluons very wide resonance (BKTs probably necessary)probably necessary)
Agashe, Belyaev, Krupovnickas, Perez, Virzi ph/0612015
Lillie, Randall, Wang ph/0701166
Lillie, Su, Tait, to appear
Phenomenological implications (III)Phenomenological implications (III)
Discovery of KK gluonsDiscovery of KK gluons
Phenomenological implications (III)Phenomenological implications (III)
Discovery of KK gluonsDiscovery of KK gluons
Phenomenological implications (III)Phenomenological implications (III)
Discovery of KK gluonsDiscovery of KK gluons
ConclusionsConclusions Realistic models with warped extra dimensions Realistic models with warped extra dimensions
have a very rich fermionic spectrumhave a very rich fermionic spectrum SM+ vector-like quarks captures the main SM+ vector-like quarks captures the main
featuresfeatures
Time to revisit RS phenomenologyTime to revisit RS phenomenology New fermions as fingerprints of custodial symmetryNew fermions as fingerprints of custodial symmetry Implications for Higgs physicsImplications for Higgs physics Implications for the discovery of bosonic resonancesImplications for the discovery of bosonic resonances