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IceCube 79 Solar WIMP Search
Matthias Danninger
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Matthias Danninger September 20, 2010 Brussels Collaboration Meeting 2
Overview
● IC79-detector in analysis
● Status & Plans IC79 WIMPs
IC86 sens. study vs. IC79
processing L0/L1/L2
higher analysis levels
● IC79 Dark Matter prospects: summer conferences
how to present results
MODELS considered
• arise in extensions of the Standard Model• assumed to be stable: relics from the Big Bang• mass from few GeV to few TeV
candidates:
• MSSM: lightest super-symmetric particle (LSP) neutralino,
χ01 = z1 1 B + z1 2 W3 + z1 3 H0
1+ z1 4 H02
simulation of “softest” and “hardest” case
hard: m(χ01) [35 GeV – 5 TeV] (τ+τ− / W+W-)
soft: m(χ01) [35 GeV – 5 TeV] (b b)
• Universal extra dimensions: Lightest Kaluza-Klein particle (LKP), B( 1 ) or γ ( 1 )
fixed branching ratios: m(γ ( 1 ) [250 GeV–3TeV]
R
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Matthias Danninger September 20, 2010 Brussels Collaboration Meeting 3
IceCube 79-string detectorfiducial detector volume:
→ all inner strings (2-string veto) → 10 top-DOM veto layer
DeepCore detector volume: → standard definition
parameters & observables:→ HLC-pulses (+fits)
→ seededRTCut cleaned SLC+HLC-pulses (+fits)
115 expected days of data 97% uptime 111.5 days 62% of sens. study→ → →VolumeTrigger not running! 50% sensitivity loss for low masses at filter levelseveral improvements expected (already): filters, SLC & comb. Llh-recopreliminary analysis-framework is prepared ready to start→
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Matthias Danninger September 20, 2010 Brussels Collaboration Meeting 4
IC79 WIMPs analysis plansIceCube-80 + DeepCore-6 sensitivity:
● final geometry & high QE PMTs included(string 79 & 80 @ original location)
● high statistics samples of corsika µ-background and atm backgroundν(incl. coincident 2 and 3 background)μ μ
● Current reconstruction-methods (IceCube-59) used
full analysis chain optimized (all simulation) (incl. multivariate cuts)
IC79 WIMPs starting point
http://icecube.wisc.edu/~mda65/talks/Madison0409.pdfOriginal talk:
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Matthias Danninger September 20, 2010 Brussels Collaboration Meeting 5
Low-level steps IC79 analysis →
General Points
HQE-DOM efficiency
more (new signal MC)
IC86 → IC79 retrigger
SMT4 trigger SMT3→
new analysis framework incl. SLC+HLC pulses
SLC+HLC llh-reco shows improvement for low multipl.-tracks
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Matthias Danninger September 20, 2010 Brussels Collaboration Meeting 6
General Points
HQE-DOM efficiency
more (new signal MC)
IC86 → IC79 retrigger
SMT4 trigger SMT3→
new analysis framework incl. SLC+HLC pulses
SLC+HLC llh-reco shows improvement for low multipl.-tracks
IC79 - L0/L1SLC cleaning (fixed)
adjust event-TW ( L2) →-------------------------------optimized online filters (DC wimp events get filtered with 99.9% eff.)+ lowUP_2010
SLC+HLC llh-reco improves string-triggered signal filter-eff. & better background rejection
Low-level steps IC79 analysis →
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Matthias Danninger September 20, 2010 Brussels Collaboration Meeting 7
General Points
HQE-DOM efficiency
more (new signal MC)
IC86 → IC79 retrigger
SMT4 trigger SMT3→
new analysis framework incl. SLC+HLC pulses
SLC+HLC llh-reco shows improvement for low multipl.-tracks
IC79 - L0/L1SLC cleaning (fixed)
adjust event-TW ( L2) →-------------------------------optimized online filters (DC wimp events get filtered with 99.9% eff.)+ lowUP_2010
SLC+HLC llh-reco improves string-triggered signal filter-eff. & better background rejection
IC79 - L2Work in progresswith muon-wg,low-E & wimp-wg---------------------------------SLC-hitCleaningincl. best possible SLChits
NFE vs. oldFEX-check, effect on llh-reco
Which L2 track reco
Low Level AnalysisVery important
Low-level steps IC79 analysis →
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Matthias Danninger September 20, 2010 Brussels Collaboration Meeting 8
high-level steps IC79 analysis→
L3
L3 processing wimps?L2 good enough?If L3, muon-wg L3?---------------------------
LLHreco zenith angle [86° < < 120°] Θ
excl. single string events nstring > 1
z_travel > -30m
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Matthias Danninger September 20, 2010 Brussels Collaboration Meeting 9
L3
L3 processing wimps?L2 good enough?If L3, muon-wg L3?---------------------------
LLHreco zenith angle [86° < < 120°] Θ
excl. single string events nstring > 1
z_travel > -30m
L4
selection of horizontal track-like events------------------------------
_av < 100m Sum all strings (Sum shortest distance track to string/nchan)
z_extern < 400m
high-level steps IC79 analysis→
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Matthias Danninger September 20, 2010 Brussels Collaboration Meeting 10
L3
L3 processing wimps?L2 good enough?If L3, muon-wg L3?---------------------------
LLHreco zenith angle [86° < < 120°] Θ
excl. single string events nstring > 1
z_travel > -30m
L4
selection of horizontal track-like events------------------------------
_av < 100m Sum all strings (Sum shortest distance track to string/nchan)
z_extern < 400m
L5 (multivariate)
group low-E and high-E
~12“high-quality”variables
determine best TMVA routine(s) 1-or-2 dim cut
IC79-data as Bg (train & test) more independent of MC→
high-level steps IC79 analysis→
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Matthias Danninger September 20, 2010 Brussels Collaboration Meeting 11
more ideas
Some where around L4-L5
sample of selected high quality horizontal events(O~10 events)⁴---------------------------
improve ang. resolution with SLC+HLC hybrid-reco (5-6 min/event)
finest binning photo-rec, etc. (lot's to investigate here)
invert 10°-bin simulation strategy, only load tables needed
not to separate µ
Only test
Only test
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Matthias Danninger September 20, 2010 Brussels Collaboration Meeting 12
final step ....→
Setting limits
Shape analysis seems like the way to go
Prospects for IC79 IC86 →
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Matthias Danninger September 20, 2010 Brussels Collaboration Meeting 13
Prospects:WIMP-Model-independent Result
effective area for final event selection as function of Eν in the
range 20-1000 GeV, for νµ and anti-νµ from the
direction of the Sun.
The result is an average over the austral winter.
Blue curve optimized for low WIMP masses
Black curve optimized for high WIMP masses
IC22: Systematic effects are included at the 1 level, and statistical σuncertainty of the same level are shown with error bars.
Preliminary
Abbasi et al., Physical Review D81 (2010) 057101. (IC22 result)
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Matthias Danninger September 20, 2010 Brussels Collaboration Meeting 14
Prospects:WIMP-Model-independent Result
effective area for final event selection as function of Eν in the
range 20-1000 GeV, for νµ and anti-νµ from the
direction of the Sun.
The result is an average over the austral winter.
Blue curve optimized for low WIMP masses
Black curve optimized for high WIMP masses
IC22: Systematic effects are included at the 1 level, and statistical σuncertainty of the same level are shown with error bars.
Preliminary
Abbasi et al., Physical Review D81 (2010) 057101. (IC22 result)
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Matthias Danninger September 20, 2010 Brussels Collaboration Meeting 15
WIMP-Model-independent Result
The median angular error , Θ shown with the statistical uncertainty at the 1 level.σ
Preliminary
Hybrid (S. Lafebre)
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Matthias Danninger September 20, 2010 Brussels Collaboration Meeting 16
Kaluza-Klein DM (LKP)Abbasi et al., Physical Review D81 (2010) 057101.
<E νμ
> = 53 GeV
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Matthias Danninger September 20, 2010 Brussels Collaboration Meeting 17
Neutralino DM (LSP)Need to be updated+ incl. new limits(CDMS-2010, superK-2009, more?)
+ add IC86 lifetime of 180d
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Matthias Danninger September 20, 2010 Brussels Collaboration Meeting 18
Neutralino DM (LSP)Updated CDMS 2010 limit
New Super-K analysis (2009) 3109.6dSoft & hard limits
Antares 3y sensitivity not so interesting not shown→
MSSM scan:
Outdated SI-limits
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Matthias Danninger September 20, 2010 Brussels Collaboration Meeting 19
Neutralino DM (LSP)Updated CDMS 2010 limit
New Super-K analysis (2009) 3109.6dSoft & hard limits
Antares 3y sensitivity not so interesting not shown→
MSSM scan:Currently non-excl. models
Outdated SI-limitsPre-limited DM content
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Matthias Danninger September 20, 2010 Brussels Collaboration Meeting 20
Neutralino DM (LSP)Updated CDMS 2010 limit
New Super-K analysis (2009) 3109.6dSoft & hard limits
Antares 3y sensitivity not so interesting not shown→
MSSM scan:Currently non-excl. Models
Non-excl Models, even after 10 ³ improvement SI-limits⁻
Outdated SI-limitsPre-limited DM content
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Matthias Danninger September 20, 2010 Brussels Collaboration Meeting 21
Neutralino DM (LSP)Updated CDMS 2010 limit
New Super-K analysis (2009) 3109.6dSoft & hard limits
Antares 3y sensitivity not so interesting not shown→
MSSM scan:Currently non-excl. Models
Non-excl Models, even after 10 ³ improvement SI-limits⁻
WMAP favored model Carlos MSSM scan
Outdated SI-limitsPre-limited DM content
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Matthias Danninger September 20, 2010 Brussels Collaboration Meeting 22
Neutralino DM (LSP)Updated CDMS 2010 limit
New Super-K analysis (2009) 3109.6dSoft & hard limits
Antares 3y sensitivity not so interesting not shown→
MSSM scan:Currently non-excl. Models
Non-excl Models, even after 10 ³ improvement SI-limits⁻
WMAP favored model CMSSM scan (Darren)
Outdated SI-limitsPre-limited DM content
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Matthias Danninger September 20, 2010 Brussels Collaboration Meeting 23
Neutralino DM (LSP)Updated CDMS 2010 limit
New Super-K analysis (2009) 3109.6dSoft & hard limits
Antares 3y sensitivity not so interesting not shown→
MSSM scan:Currently non-excl. Models
CMSSM scan (Darren)(/data/sim/IceCube/2007/generated/LE_deepcore/darkSUSY/cmssm)
WMAP favored model
Outdated SI-limitsPre-limited DM content
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Matthias Danninger September 20, 2010 Brussels Collaboration Meeting 24
Even more plans for futureFrom prospects
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Matthias Danninger September 20, 2010 Brussels Collaboration Meeting 25
AND MORE plans for futureFrom prospectsmSUGRA
CMSSMMSSM
Scan models→ fixed branching ratio→ simulate annihilation spectrum→ (check if equilibrium condition is met)
Convolute with effective neutrino area (livetime etc.)
Compare with number of observed events → limit (e.g. IC79)→ excluded yes/no
Possible to decide model by modelAnd plot various interesting MSSM spaces
J. Edsö + P. Scott (phenomenology side)
me (detector side)
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Matthias Danninger September 20, 2010 Brussels Collaboration Meeting 26
Deep Core events
Thank You
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Matthias Danninger September 20, 2010 Brussels Collaboration Meeting 27
Additional Slides
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Matthias Danninger September 20, 2010 Brussels Collaboration Meeting 28
Additional Slides
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Matthias Danninger September 20, 2010 Brussels Collaboration Meeting 29
Neutralino DM (LSP)
IceCube-22 & study: Only used data, when Sun is below the horizon
main syst. uncertainty:Photon propagation in the ice & absolute DOM efficiency (~20%)
relate muon flux and WIMPnucleon crosssection:
IC80-onlyIC80+DC6
Additional mass 35GeV
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Matthias Danninger September 20, 2010 Brussels Collaboration Meeting 30
Additional Slides
Preliminary
Preliminary