IceCube 79 Solar WIMP Search. Matthias Danninger

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1 IceCube 79 Solar WIMP Search

2 Overview about indirect solar Dark Matter analysis IC79-detector in analysis side by side: IC86 sens. study vs. IC79 analysis... cut level 0 final level IC79+DeepCore Dark Matter prospects: (Sun) Looking forward... 2

3 Neutrinos from Dark Matter signature: ν excess over background from Sun direction physics uncertainties involved: - relic density calculations - DM distribution in the halo smaller effect for this method mean density ρ l ocal = 0.3 GeV/c2 cm3 - velocity distribution (Maxwell v rms = 270km/s) - WIMP properties (MSSM/UED...) - interaction of WIMPs with matter (capture) planetary effects (high masses) Sun composition - self interaction (annihilation) background: atm µ ~O(109) events/year (downwards) atm ν ~O(103) events/year (all directions) 3

4 Investigated DM candidates 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 = z11 B + z12 W3 + z13 H01+ z14 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 KaluzaKlein particle (LKP), B(1) or γ ( 1) fixed branching ratios: m(γ ( 1 ) [250 GeV 3TeV] R 4

5 Low Energy neutrino Search Signal MC ν-interaction in the Sun ν-energies of ~ 1 TeV have high interaction probability in Sun Sun becomes ν-opaque low mean muon energy in detector short tracks with few hits 5

6 IceCube 79-string detector fiducial 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) 6

7 Deep Core 6 additional strings 60 High Quantum Efficiency PMTs (deployed in deep ice) 7m DOM spacing (17m standard), 72m inter-string spacing. focus energies (few GeV~1TeV) 4π detector using IceCube as an active veto. Southern sky sources (GC) and year round observation for the Sun. 7

8 Deep Core events 8

9 Deep Core events 9

10 Deep Core events 10

11 Improving observables Key-detector quantities for successful track reconstructions improve DeepCore improves low-energy events 10 GeV ~ 1TeV Nchan Number of hit OMs Nstring Number of hit strings Ndir Number of direct hits (un-scattered photons) IceCube-80 + DeepCore-6 sensitivity: final geometry & high QE PMTs included (string 79 & original location) high statistics samples of corsika µ-background and atm ν background (incl. coincident 2μ and 3μ background) Current reconstruction-methods (IceCube-59) used Full analysis chain simulated (incl. multivariate cuts) IceCube-79 11

12 IC86 sens. IC79 analysis (1/6) IC79 HQE-DOM efficiency IC86 IC79 retrigger...and more (new signal MC) old SMT4 trigger SMT3 new analysis framework including SLC+HLC pulses SLC+HLC llh reconstruction shows improvement for low multipl.-tracks 12

13 IC86 sens. IC79 analysis (2/6) IC79 SLC cleaning adjust event-tw Better optimized online filters (DC wimp events get filtered with 99.9% eff.) SLC+HLC llh reconstruction improves string-triggered signal filter-eff. & better background rejection 13

14 IC86 sens. IC79 analysis (3/6) IC79 too early... selection of horizontal track-like events analysis framework for filterlevels ready examples after online-filters 14

15 IC86 sens. IC79 analysis (3/6) IC79 too early... selection of horizontal track-like events analysis framework for filterlevels ready examples after online-filters 15

16 IC86 sens. IC79 analysis (3/6) IC79 too early... selection of horizontal track-like events analysis framework for filterlevels ready examples after online-filters 16

17 IC86 sens. IC79 analysis (3/6) IC79 too early... selection of horizontal track-like events analysis framework for filterlevels ready examples after online-filters 17

18 IC86 sens. IC79 analysis (3/6) IC79 too early... selection of horizontal track-like events analysis framework for filterlevels ready examples after online-filters 18

19 IC86 sens. IC79 analysis (4/6) IC79 too early... but... 19

20 IC86 sens. IC79 analysis (4/6) IC79 too early... but... 20

21 IC86 sens. IC79 analysis (4/6) IC79 too early... but... 21

22 IC86 sens. IC79 analysis (5/6) IC79 too early... group low-e and high-e ~12 high-quality variables determine best multiv. routine(s) 1-or-2 dim cut IC79-data as bg (sun above horizon) to train & test more independent of MC 22

23 IC86 sens. IC79 analysis (5/6) IC79 too early... group low-e and high-e ~12 high-quality variables determine best multiv. routine(s) 1-or-2 dim cut IC79-data as bg (sun above horizon) to train & test more independent of MC 23

24 IC86 sens. IC79 analysis (6/6) IC79 too early... Investigate all methods for final solar-cut most likely use shape analysis (likelihood search) (Gustav & Daan) 24

25 Kaluza-Klein DM (LKP) Abbasi et al., Physical Review D81 (2010) 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 WIMP-nucleon crosssection: <Eνμ > = 53 GeV 25

26 Kaluza-Klein DM (LKP) Abbasi et al., Physical Review D81 (2010) 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 WIMP-nucleon crosssection: 26

27 Neutralino DM (LSP) Abbasi et al., Phys. Rev. Lett. 102, (2009) 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 WIMP-nucleon crosssection: 27

28 Neutralino DM (LSP) Abbasi et al., Phys. Rev. Lett. 102, (2009) 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 WIMP-nucleon crosssection: 28

29 Neutralino DM (LSP) Abbasi et al., Phys. Rev. Lett. 102, (2009) 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 WIMP-nucleon crosssection: 29

30 Neutralino DM (LSP) Abbasi et al., Phys. Rev. Lett. 102, (2009) IceCube-22 & study: Only used data, when Sun is below the horizon main syst. uncertainty: Photon propagation in the ice & absolute DOM efficiency (~20%) IC80+DC6 IC8 0- o nl y relate muon flux and WIMP-nucleon crosssection: 30

31 Neutralino DM (LSP) Abbasi et al., Phys. Rev. Lett. 102, (2009) IceCube-22 & study: Only used data, when Sun is below the horizon main syst. uncertainty: Photon propagation in the ice & absolute DOM efficiency (~20%) Additional mass 35GeV IC80+DC6 IC8 0- o nl y relate muon flux and WIMP-nucleon crosssection: 31

32 WIMP-Model-independent Result Abbasi et al., Physical Review D81 (2010) effective area for final event selection as function of Eν in the range GeV, for ν µ and anti-ν µ from the direction of the Sun. The result is an average over the austral winter. Preliminary IC22: Systematic effects are in-cluded at the 1σ level, and statistical uncertainty of the same level are shown with error bars. 32

33 WIMP-Model-independent Result Abbasi et al., Physical Review D81 (2010) Preliminary Hybrid (S. Lafebre) The median angular error Θ, shown with the statistical uncertainty at the 1σ level. 33

34 Looking forward... Volume Trigger unfortunately not running! 50% sensitivity loss for low masses at filter level several issues (retrigger/hqe-efficiency...) have to be fixed before actual analysis can start preliminary analysis-framework is prepared ready to start 115 expected days of data 97% up-time days 62% of sens. study several improvements expected (already): filters, use of SLC & comb. llh-reco still pending improvements: reconstructions (DirectWalk, hybrid-reco) Thank You 34

35 Looking forward DeepCore makes low-energy region 10 ~ 100 GeV accessible for IceCube IceCube-80 + DeepCore-6 sensitivity analysis is starting point for 2010 IceCube-79 string analysis Further improvements: Including isolated hits and new reconstruction techniques All year search for low WIMP masses (IceCube active veto for DeepCore) String 79 & 80 will create even denser DeepCore array Thank You 35

36 Additional Slides 36

37 Additional Slides 37

38 Additional Slides Preliminary Preliminary 38

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