Heavy Higgs
at LHC in UED
Kin-ya Oda (Osaka)
withKenji Nishiwaki (Kobe)
Naoya Okuda (Osaka)
Ryoutaro Watanabe (Osaka)
arXiv:1108.1764, 1108.1765
2011年8月22日月曜日

LHC!!

• We have not seen weak-scale SUSY.
★ MSSM (almost) dead.
★ I would do light degenerate scenario if I had
bet on SUSY.
✴ Natural but challenging to observe.
✴ Would be seen in events triggered by ISR.

• Weak-scale UED provides similar ISR
signature in MT2. [Murayama, Nojiri, Tobioka (2011)]
2011年8月22日月曜日

LHC!!

• We have not seen weak-scale SUSY.
★ MSSM (almost) dead.
★ I would do light degenerate scenario ifLSP
I had
bet on SUSY.
✴ Natural but challenging to observe.
✴ Would be seen in events triggered by ISR.

• Weak-scale UED provides similar ISR
signature in MT2. [Murayama, Nojiri, Tobioka (2011)]
2011年8月22日月曜日

soft onesonly

ヒッグス祭• Great step to prove that we are reallyliving in a “superconducting” vacuum.

2011年8月22日月曜日

ヒッグス祭• Great step to prove that we are reallyliving in a “superconducting” vacuum.

2011年8月22日月曜日

ヒッグス祭• Great step to prove that we are reallyliving in a “superconducting” vacuum.
Light

2011年8月22日月曜日

ヒッグス祭• Great step to prove that we are reallyliving in a “superconducting” vacuum.
Light

2011年8月22日月曜日

Middleヒッグス祭• Great step to prove that we are reallyliving in a “superconducting” vacuum.
Light

2011年8月22日月曜日

MiddleHeavy

ヒッグス祭• Great step to prove that we are reallyliving in a “superconducting” vacuum.
Light

Middle残念
2011年8月22日月曜日

Heavyヒッグス祭• WeGreatsteptoprove
thatwearereally
bet on middle & heavy regions:livingina“superconducting”
vacuum.
200GeV < M < 300GeV, 500GeV < MH

LightHMiddle

残念2011年8月22日月曜日

Heavyヒッグス祭• WeGreatsteptoprovethatwearereallybet on middle & heavy regions:livingina“superconducting”
vacuum.
200GeV < M < 300GeV, 500GeV < M
H

Light

H

MiddleHeavy（保険: For light Higgs, MH < 140GeV,
we got by far the strongest collider
bound: MKK > 700GeV in mUED.）残念

2011年8月22日月曜日

Why UED?
• Provides LKP as DM candidate.
★ Which is stable due to geometry, not by hand.
✴ Conservation of KK parity, KK (angular) momentum, etc.
★ From small number of free parameters.

• Predicts (multiple of) three generations in 6D.
★ (From cancellation of SU(2)W global gauge anomaly.)• Heavy Higgs > 200GeV allowed (even favored).
★ In weak-scale UED: MKK ˜ vEW = 246GeV.
★ Due to KK-top loops in T-parameter. (shown later)
2011年8月22日月曜日

So what is UED?
• All SM ﬁelds live in higher dimensions.
★ Compactiﬁed within ˜am.

• KK modes for each SM mode.
★ Diﬀerent masses, same charges.

• Higgs as zero mode.
★ EWSB by bulk Higgs potential.
✴ Except for Dirichlet Higgs model. [Haba, KO, Takahashi, 11]2011年8月22日月曜日

Outline:
UED Higgs at LHC
1.Want signal independent ofdetailed boundary structure
2.Heavy Higgs from KK-top loops
3.Enhanced gluon fusion from KKtop loops
2011年8月22日月曜日

Dependence onboundary structure• Simple UEDs (of y˜y+2πR type)require orbifolding (like ­y˜y)y=0

to have chiral fermions.

y=­πR
y=πR

★ Resulting in orbifold ﬁxed point (e.g. at y=0).
★ On which we can put arbitrary mass, mixing,and interaction (consistent to SM gaugesymmetry).

• Especially KK mass splitting could
be aﬀected.
★ All b→sγ, direct KK signals and DM relicabundance suﬀer from boundary structure.
2011年8月22日月曜日

LKP

soft ones
onlyCan we have a
UED signal
independent ofsuch detailed
boundarystructure?
2011年8月22日月曜日

Outline:
UED Higgs at LHC
1.Want signal independent ofdetailed boundary structure
2.Heavy Higgs from KK-top loops
3.Enhanced gluon fusion from KKtop loops
2011年8月22日月曜日

KK-top loops in T-parameter•

KK-top contribution shift T-parameter positively.
★

E.g. in 5D mUED on S1/Z2:

0.05

0.15

1.6

Baak et al. 1107.0975
2011年8月22日月曜日

S ∝ π33ʼ’­π3Qʼ’T ∝ π11­π33

KK-top loops in T-parameter•

KK-top contribution shift T-parameter positively.
★

E.g. in 5D mUED on S1/Z2:

0.05

KK-top0.15

KK-top1.6

Baak et al. 1107.0975
2011年8月22日月曜日

S ∝ π33ʼ’­π3Qʼ’T ∝ π11­π33

Heavy Higgs favoredin weak-scale UED
1• E.g. in 5D mUED model on S /Z2:

Baak et al.
1107.0975• MH>250GeV for MKK<500GeV.
2011年8月22日月曜日

Heavy Higgs
in UED models• This is a general tendency.
★ KK top loops not only in 5D mUED.
★ Insensitive to KK mass splitting Mn→Mn+δMn.
✴ (That comes from brane-localized Lagrangian.)

2011年8月22日月曜日

Outline:
UED Higgs at LHC
1.Want signal independent ofdetailed boundary structure
2.Heavy Higgs from KK-top loops
3.Enhanced gluon fusion from KKtop loops
2011年8月22日月曜日

UED Higgs at LHC• gg→H production
enhanced sinceloop-produced.
• DecaySM ﬁgures

H→WW,ZZ,tt,bb notmuch aﬀected since
thereʼ’s tree coupling.

2011年8月22日月曜日

UED Higgs at LHC• gg→H production
enhanced since

KK-toploop-produced.
• Decay
SM ﬁgures

H→WW,ZZ,tt,bb notmuch aﬀected since
thereʼ’s tree coupling.

2011年8月22日月曜日

Gluon fusion in UED• Again, insensitive to detailed
KK mass splitting.
• We have computed:★ In 5D:✴ S1/Z2 & Dirichlet Higgs.
★ In 6D T2-based:✴ T2/Z4, T2/Z2, T2/(Z2 Z2ʼ’) & RP2.
★ In 6D S2-based:✴ S2, S2/Z2 & Projective Sphere.
✦2011年8月22日月曜日

Underlined ones are newly computedby ourselves.

Results
2011年8月22日月曜日

ZZ → 4 leptons
MH = 250GeV••

7TeV, 1fb­1, 10GeV bin.
MKK=200,400,600,800GeV (250GeV for DH).

2011年8月22日月曜日

Nishiwaki, KO, Okuda, Watanabe
1108.1764

ZZ → 4 leptons
MH = 250GeV••

7TeV, 1fb­1, 10GeV bin.
MKK=200,400,600,800GeV (250GeV for DH).

Nishiwaki, KO, Okuda, Watanabe
1108.1764• 250GeV excess at ATLAS(consistent to CMS data) may
be accounted for by UED.
­1

• 10fb would suﬃce toestablish the resonance.
2011年8月22日月曜日

ZZ → 4 leptons
MH = 500GeV••

7TeV, 1fb­1, 25GeV bin.
MKK=200,400,600,800GeV (500GeV for DH).

2011年8月22日月曜日

Nishiwaki, KO, Okuda, Watanabe
1108.1764

ZZ → 4 leptons
MH = 500GeV••

7TeV, 1fb­1, 25GeV bin.
MKK=200,400,600,800GeV (500GeV for DH).

Nishiwaki, KO, Okuda, Watanabe
1108.1764­1• With 10fb :★A few (virtually background free)
events in 5D UED.
★May establish the peak in 6D UED.

2011年8月22日月曜日

ZZ → 4 leptons
MH = 700GeV••

14TeV, 1fb­1, 25GeV bin.
MKK=200,400,600,800GeV (700GeV for DH).

2011年8月22日月曜日

Nishiwaki, KO, Okuda, Watanabe
1108.1764

ZZ → 4 leptons
MH = 700GeV••

14TeV, 1fb­1, 25GeV bin.
MKK=200,400,600,800GeV (700GeV for DH).

Nishiwaki, KO, Okuda, Watanabe
1108.1764­1• With upgraded 14TeV, 10fb :★A few (virtually background free)
events in 5D UED.
★May establish the peak in 6D UED.

2011年8月22日月曜日

Inclusive bound from Higgs
production rate at CMS

2011年8月22日月曜日

Inclusive bound from Higgs
production rate at CMS

2011年8月22日月曜日

Inclusive bound from Higgs
production rate at CMS
1• For 5D (mUED on S /Z2):★By far the strongest collider bound:
MKK > 700GeV.
★For ˜250GeV Higgs: MKK > 750GeV.
✴ Still able to account for ATLAS ZZ→4l 4events(with a lucky factor 2).
2011年8月22日月曜日

Inclusive bound from Higgs
production rate at CMS
1• For 5D (mUED on S /Z2):★By far the strongest collider bound:
MKK > 700GeV.
★For ˜250GeV Higgs:
M>750GeV.
KK
M =800GeVH✴ Still able to account for ATLAS ZZ→4l 4events(with a lucky factor 2).
2011年8月22日月曜日

Summary• UED is nice: DM & 3 families (6D).
• Due to KK-top loops:★ Weak-scale UED generically favors heavy Higgs.
★ Higgs production gg→H is enhanced, which is:✴ Insensitive to KK mass splitting, and thus,✴ Complementary to other signatures.

• At LHC:★ When Higgs is light, MH<140GeV, (by far the strongest collider bound)
MKK>700GeV is obtained for 5D mUED.

★ Middle 250GeV UED Higgs may account for ATLAS ZZ→4l if lucky.
★ Heavy 500 (700) GeV UED Higgs can be seen within 10fb­1 of data at
7 (14) TeV.

2011年8月22日月曜日

Discussion• Possible issues:★ KK top loops for H→WW,ZZ.
✴ Might reduce events by ˜O(10)%.
✴ Same order as N(N)LO QCD
corrections.
✦(NNLO PDF gives <˜30% enhancement.)★ SM background?

• Todo:★ Combined analysis with H→WW.
★ H→γγ is also enhanced.
2011年8月22日月曜日

Discussion• Possible issues:★ KK top loops for H→WW,ZZ.
✴ Might reduce events by ˜O(10)%.
✴ Same order as N(N)LO QCD
corrections.
✦(NNLO PDF gives <˜30% enhancement.)★ SM background?

• Todo:★ Combined analysis with H→WW.
★ H→γγ is also enhanced.
2011年8月22日月曜日

KK-top

No matter what we will see,
finally, let us enjoy
the new era offundamental physics.

Thank you.
2011年8月22日月曜日