The Fermi Lines...and LHC dark matter
Daniel WhitesonUC Irvine
Map
The Line: Instrumental studies
The Line: Fermi vs LHC
W signals: Fermi vs LHC
New LHC DM searches
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Instrumental Line Studies
photons
Could the peak photons be spurious?Are they different in some way?
First ideaisolate signal photonsUse energy cut
ButS/B is not large.Few signal photons.
Can we do better?
sPlotsdiscriminating
variableunfoldingvariable
(pdfs factorize)
data
background
signal
sPlots
Whiteson1208.3677
Results
Whiteson1208.3677
variables
Whiteson1208.3677
External issues?
Whiteson1208.3677
Reconstruction
Whiteson1208.3677
Solar signals
Solar regionFind galactic coord of solar photons
Solar regionFind galactic coord of solar photons
excluding GC
Whiteson1302.0427
Solar regionFind galactic coord of solar photonsexcluding GC
Whiteson1302.0427
The bigger picture
Symposium
Eric Charles
Simple explanation?Is there a simple energy-dependent efficiency?
Simple explanation?Is there a simple energy-dependent efficiency?
Fails to explain- localization of peak near GC, Limb
- theta-dependence of Limb peak
- lack of feature in remainder of Sky
Common features?GC
GC
Limb
Limb Sun
Sun
Whiteson1302.0427
thetaGC Sun Limb Sky-GC-Sun
All
Theta[30,45]
GCSunSky-GC-Sun
Whiteson1302.0427
thetaGC Sun Limb Sky-GC-Sun
All
Theta[30,45]
GCSunSky-GC-Sun
Whiteson1302.0427
thetaGC Sun Limb Sky-GC-Sun
All
Theta[30,45]
GCSunSky-GC-Sun
Whiteson1302.0427
DiscussionNot a simple energy-dependent efficiency - Not seen in full sky
Not a energy-and-theta-dependent efficiency - GC peak not isolated to theta [30,45] - Not seen in full sky with theta restriction (but a hint?)
More complex efficiency dependence? - Sun/Limb/GC sweep out different paths across detector
High-statistics datasets
NEW!
...and preliminary
Transients
Photon Energy [GeV]100 110 120 130 140 150 160 170 180
Cou
nts
6000
8000
10000
12000
14000
16000
Transients
Photon classes:transients
sourceclean
ultraclean
NEW!
...and preliminary
No clues....
NEW!
...and preliminary
Fermi-LHC connection: γ
mono-photon1307.5064
Also:Weiner & Yavin:1206.2910, 1209.1093
Theories1307.5064
k1 and k2
controlrelative
couplingsto EW bosons
Limits1307.5064
Fermi-LHC connection: W
Mono-heavy jet
sub-jet
sub-jet
fat jet
W/ZMissing
Momentum
1309.4017 (PRL)
Ning Zhou, UCI33
34
Limits1309.4017 (PRL)
35
XX->WW
"Indirect" is an excluded region which is a combination of exclusions from the LAT line search, the LAT dwarf bounds and (at higher m_chi) the VERITAS Segue bounds. It is assumed that this DM makes up 100% of cosmological DM, no matter what its annihilation cross section is.1403.6734
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New LHC DM searches
Where is the new
physics!?
Traditional approach
Use theory guidanceOptimize analysis to squeeze out maximal sensitivity to new physics.
param 1
para
m 2
(param 3-N fixed at arbitrary choices)
Model
Search strategySpec
ific
Gen
eral
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Model independent search
Ignore theories completelycompare data to standard model
Model
Search strategySpec
ific
Gen
eral
“Never listen to theorists.
Just go look for it.”
--A. Pierce, 201040
Compromise
Admit the need for a modelNew signal requires a coherent physical explanation,
even trivial or effective
Generalize your modelBuild models using experimental guidance. Ask not: what would we like to discover?But instead: what are we able to discover?
Model
Search strategySpec
ific
Gen
eral
41
Compromise
Admit the need for a modelNew signal requires a coherent physical explanation,
even trivial or effective
Generalize your modelBuild models using experimental guidance. Ask not: what would we like to discover?But instead: what are we able to discover?
Resonances: lets make sure we don’t miss anything easy to find.
Model
Search strategySpec
ific
Gen
eral
42
Is this being done?
W
ZW’
43
Is this being done?
W/Z
ZW’/H
mll = mZ
mjj = mW/Z
44
What about this?
Z’mll != mZ
mjj != mW
45
Missed resonances?
Easy-to-find resonances may exist in our data and
nobody has looked!
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Missed resonances?
Easy-to-find resonances may exist in our data and
nobody has looked!
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Topological modelsUCI Physics 247
Final projectarXiv: 1401.1462
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Topological modelsFor a given final state (eg lljj) construct
all models with resonances. Then look for them!
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Connections to EFT, Simp. ModelsM
ass
scal
e
Completeness
Simplified models
EffectiveOperators
FullTheories
50
Connections to EFT, Simp. ModelsM
ass
scal
e
Completeness
Topo models
Simplified models
EffectiveOperators
FullTheories
51
Mono-Z’
mjj = mW or mZ mll = mZ
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Mono-Z’
mjj = mW or mZ mll = mZ
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What about other values?
Mono-....
Z’
X1
X2
X1
Z’SignatureHeavy resonance + MET
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With Tongyan Lin
Map
The Line: Instrumental studies
The Line: Fermi vs LHC
W signals: Fermi vs LHC
New LHC DM searches
Relevance totalk title
Topi
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You arehere
Backup
XX->WW
1403.673457
Limits1307.5064
Ring around the Sun125-140 GeV
Sensitivity Whiteson1208.3677
Background: flat
Signal: delta func at 0.5
Discriminating var Unfolding var
Sensitivity Whiteson1208.3677
Background: flat
Signal: delta func at 0.5
Discriminating var Unfolding var
Angles
Simulation: GCE>50 E>100
Simulation: GCE>50 E>100
Where are they from?
Finkbiener&Su1206.1616
The photons
Rao & DW1210.4934
Following resultsuse a 3-degreecircle. Results
are ~ the same forlarger regions
Locations
Rao & DW1210.4934
Zoom: 1 sigma
Rao & DW1210.4934
Questions
Questions
Hypothesis tests(l,b) fit far from GCq → negative
(l,b) fit is close to 0,0q → zero
Questions
Hypothesis tests(l,b) fit far from GCq → negative
(l,b) fit is close to 0,0q → zero
separate fits are betterq → larger
joint fit is betterq → smaller
Hypothesis tests
Locations
Conclusion:The photon locations are easily
consistent with a single DM halo at the GC
mono-W, etcFat jet pT >250two subjets giving mjet =[50,120]No e,mu,gamma<= 1 additional narrow jetsMET >350 or 500
1309.4017 (PRL)
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