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Dark Matter Mass Constrained by Relic Abundance, Direct Detections, and Colliders
Ho-Chin TsaiCYCU2013/03/22 Academia Sinica
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1301.4186In coll. with Kwei-Chou Yang
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Outline
Introduction
Relic Abundance
Di-Jet
Mono-Jet
Direct Detection
Collider
Conclusions
Constraints
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Introduction of Dark Matter• DM evidence
• Wimp Miracle
• What Collider can do
• Dimensional Analysis
• Model Study
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DM
DM SM
SM
Indirect detectionRelic
Direct detectionCollider
ΩDMh2=0.12
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Lagrangian
• Fermionic dark matter with a mediator Y
• Annihilation
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~ 0.1
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Relic
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Perturbativity
Color code : Magenta Green Blue
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Relic
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StatusProgressOutlookTAUP 2011 München, September 7, 2011 V. ZacekUniversitéde Montréal PICASSO
Direct Detection Experiment
No signal Assume interaction typethen inverse the flux toget cross section bound
Mole number, E_R ~100 keV
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Nucleus Size ~40 MeV
Proton200 MeV
X-section Calculation
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DM particle
Mediator ~100 GeV
momentum transferred ~100MeV
Quark level Nucleon level(Hadronic Matrix element ) Nuclear(form factor)
H.Y. Cheng
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D-N Elastic Cross-section
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Suppression factor1
10^-2
10^-6
10^-10
with m_D = 100 m_N
Dark SUSY
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Relic+Direct Detections
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Relic+Direct Detections
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relic
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mY=100, 500, 1000, 4000 GeV
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mY=100, 500, 1000, 4000 GeV
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Collider
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Collider can do better than direct detection with heavy mediator and light DM more better when momentum suppression interaction
Reduced mass ~1GeV
Relic Direct Detection
Collider
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In-visible Y
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proton
proton
jet
χ χ
g*ū
uu
Y*,Y
Available Mono-Jet searches:• CMS 36 pb−1• ATLAS 1 fb−1: LowPt, HighPt and veryHighPt
SM BG p p j Z j v v , 2 to 2 process
• VeryHighPT: 7 TeV, 1fb-1• missing ET > 300GeV, missing pT j1 > 350GeV
• σ1j < 0.045pb 1202.0158 ATLAS
MadGraph 5
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Effective Cut-off Scale
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Xenon100 Mono-Jet Perturbativity Relic
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In Effective Cut-off Scale
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RelicXenon100 PerturbativityMono-Jet
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Dijet Resonances Search1. Find resonance on smooth QCD background 2. Bin data for search efficiency 3. Unphysical if resonance width < energy resolution 4. Best bin width slightly bigger than energy resolution due to particle decay width5. Narrow width: can be applied to particle decay width < energy resolution
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Upper Limit for Y
1107.4771
CDF 0812.4036 260 - 1400 GeVCMS 1107.4771 1000 - 4100 GeV ATLAS 1108.6311 900 - 4000 GeVTake Y width < 0.1 mY ~ resolution
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Visible Y CDF CMSDi-Jet
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Only constrainnot cases of
mY=100, 300, 500, 700 GeV mY=500, 1000, 1500, 1000 GeV
Find Y to claim dark matter exist.
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Relic+Direct Detections+Colliders
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Relic + Direct
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Visible Y CDF CMS Di-Jet
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mY=100, 300, 500, 700 GeV mY=500, 1000, 1500, 1000 GeV
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Relic+Direct Detections+Colliders
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Relic + Direct
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Y width
Narrow width
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Conclusions• Study fermionic DM mediated by scalar particle universally to
the SM quarks.• Restrict mass relation by the relic abundance, direct
detections, and mono-jet and di-jet search at collider. • A pseudo-scalar mediator comfort relic and direct detection
due to momentum suppression.• Mono-jet for invisible Y search is limited by DM mass and
relevant on PS, PP case only.• Di-jet for visible Y search is powerful, relevant on PS, PP case,
stronger than dark matter direct detection in constraint.• DM search might be near if Y were found.
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Thank you.
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Di-Jet Visible Y Search
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