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

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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

36

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

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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

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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

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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

54

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

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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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