lhc limits on the higgs-portal wimps
TRANSCRIPT
Yoshitaro Takaesu U. of Tokyo
LHC limits on the Higgs-‐portal WIMPs
Based on arXiv: 1407.6882 in collabora9on with M. Endo (U.Tokyo)
Portal models to Hidden Sector
2
Consider another world where par9cles are SM singlets (Hidden Sector).
The par9cles interact to our SM world through Gravity.
Also, they may interact through…
DM ?
HL
FYµXµ
1fS
FµFµS
|H|2S2
Neutrino Portal
Vector Portal
Axion Portal
Higgs Portal
Sterile neutrino
Dark Photon
Axion-‐like par9cle
Higgs invisible decay
SM Hidden G
In this talk, we discuss the Higgs-‐portal possibility.
Constraints on Higgs-‐portal models
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• Relic abundance • Direct detec9on • H Invisible decay
[Simone, Giudice, Strumia: 1402.6287]
Tight constraints on Higgs-‐portal “DM”.
Constraints on Higgs-‐portal models
4
• Relic abundance • Direct detec9on • H Invisible decay
[Simone, Giudice, Strumia: 1402.6287]
Tight constraints on Higgs-‐portal “DM”.
?
If not the DM…
Constraints on Higgs-‐portal models
5
• Relic abundance • Direct detec9on • H Invisible decay
[Simone, Giudice, Strumia: 1402.6287]
Tight constraints on Higgs-‐portal “DM”.
?
Important to know to what extent LHC can explore the heavier Higgs-‐portal models.
Heavy Higgs-‐portal WIMP search
Need not to be the DM
Collider search
Higgs-‐portal models discussed
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Scalar
Vector
AnI-‐sym. Tensor
WIMPs are SM singlets. parity is assumed for stability of WIMPs.
LS =12µSµS 1
2M2
SS2 cS |H|2S2 SS4
Z2
Details of these spin-‐1 models (UV comple9on etc.) will not be discussed in this talk. (cf. Y.Farzan, A.R.Akbarieh (2012) S.Beak, P.Ko, W.Park, E.Senaha (2013) )
[A. Djouadi et al.1205.3169, S.Kanemura et al.1005.5651 ]
[O.Cata, A. Ibarra: 1404.0432]
m2B = M2
B + 4cBv2m2V = M2
V + 2cV v2m2S = M2
S + 2cSv2 aher EWSB
LV = 1
4V µVµ +
1
2M2
V VµVµ + cV |H|2V µVµ + · · ·
LB = 1
4@B
µ@Bµ 1
2@µBµ@B
1
4M2
BBµBµ
cB |H|2BµBµ + · · ·
8TeV LHC limits for Heavy Higgs-‐portal WIMP
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LHC searches considered
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VBF Mono Z Mono jet CMS: 1408.3583 (Signal event limit)
ATLAS: PRD 90 012004 (2014) (Fid. Xsec limit)
CMS: EPJC 74 (2014) 2980 (Br_inv limit)
• 8TeV MET Dark Maler search • Cut-‐based analysis
* Cut acceptances are es9mated by LO events with MG5+pythia+Delphes. * Other channels such as l~+MET may have comparable sensi9vity, but will not be considered here.
NLO QCD+EW (HAWK) NLO QCD+EW (HAWK) NLO QCD (MCFM)
Channel:
Analysis:
Signal Xsec:
Signal process:
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c χ
mχ [GeV]
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c χ
mχ [GeV]
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c χ
mχ [GeV]
VBFMono-jetMono-Z
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c χ
mχ [GeV]
Limits for the Heavy Higgs-‐portal WIMPs
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Vector * Limits for large coupling may not be valid due to unitarity (or break down of perturba9ve calcula9on), depending on UV models.
L = 1
4VµV
µ +1
2m2
BVµVµ + cB |H|2VµV
µ + · · ·
Excluded by Higgs invisible decay
• VBF sets the strongest limits. • Coupling > ~0.5 can be constrained by 8TeV LHC.
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c χ
mχ [GeV]
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c χ
mχ [GeV]
VBFMono-jetMono-Z
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c χ
mχ [GeV]
Ωh2 = 0.01
0.001
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10-710-8
Limits for the Heavy Higgs-‐portal WIMPs
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Vector
L = 1
4VµV
µ +1
2m2
BVµVµ + cB |H|2VµV
µ + · · ·
* Relic abundance lines are drawn just as a physical measure of coupling strength. * Thermal freeze out is assumed.
LHC probes WIMPs with very small relic abundance.
Limits for the Heavy Higgs-‐portal WIMPs
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VBFMono-jetMono-Z
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c χ
mχ [GeV]
Ωh2 = 0.010.001
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Tensor
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mχ [GeV]
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c χ
mχ [GeV]
VBFMono-jetMono-Z
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c χ
mχ [GeV]
Ωh2 = 0.01
0.001
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Vector
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mχ [GeV]
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c χ
mχ [GeV]
VBFMono-jetMono-Z
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c χ
mχ [GeV]
Ωh2 = 0.01
0.001
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Scalar
• VBF puts the strongest limit for any WIMP model. • An9-‐sym. tensor WIMP get similar (stronger) constraints as vector WIMP. • Constraints on scalar WIMP is very weak.
14 TeV LHC prospects
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Naive projecIon from 8TeV -‐> 14TeV
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We need to know and to es9mate the 14 TeV constraints on .
N limsig
c
c2(m) <
N limsig
(m, c = 1)L
is roughly es9mated as following: N limsig
95% CL (simple Gaussian)
Rela9ve does not improve
Rela9ve reduces as . 1/
NBG
is es9mated by theore9cal calcula9ons with experimental cuts.
sys
stat
stat
NBG
14TeV
=
N8TeV
BGN14TeV
BG
stat
NBG
8TeV
N limsig 2tot
tot =
2sys + 2
stat
sys
NBG
14TeV
=
sys
NBG
8TeV
Missing ET cut @14TeV: > 450 GeV (Mono Z), > 400 GeV (Mono jet) > 130 GeV (VBF)
is es9mated by simula9on (MG5+pythia+Delphes). N14TeVBG /N8TeV
BG
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VBFMono-jetMono-Z
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c χ
mχ [GeV]
Ωh2 = 0.01
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Ωh2 = 0.01
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mχ [GeV]
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mχ [GeV]
VBFMono-jetMono-Z
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c χ
mχ [GeV]
Ωh2 = 0.010.001
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10-8
14TeV LHC SensiIvity @ 100 V^-‐1
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Tensor Vector
Scalar
• LHC will constrain Tensor (Vector) coupling of > 0.1 (0.3) (relic abundance of < 0.01). • Scalar Higgs-‐portal WIMP limit is s9ll very weak…
8TeV LHC Limits
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VBFMono-jetMono-Z
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c χ
mχ [GeV]
Ωh2 = 0.010.001
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Tensor
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mχ [GeV]
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c χ
mχ [GeV]
VBFMono-jetMono-Z
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c χ
mχ [GeV]
Ωh2 = 0.01
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Vector
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mχ [GeV]
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mχ [GeV]
VBFMono-jetMono-Z
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c χ
mχ [GeV]
Ωh2 = 0.01
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10-710-8
Scalar
Summary
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LHC constraints on the Heavy Higgs-‐portal models have been discussed.
8 TeV LHC can constrain Higgs-‐portal couplings below 1 for the vector and tensor case. Limit on Scalar model is very weak.
14 TeV LHC can be sensi9ve to O(0.1) couplings of vector and tensor models. Limit on Scalar model is s9ll very weak.
VBF channel puts stronger limits on Higgs-‐portal models than Mono-‐jet and Mono-‐Z channels.
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