Dark Matter Searches. Marijke Haffke University of Zürich
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1 University of Zürich
2 Structure Ι. Introduction - Dark Matter - WIMPs Ι Ι. ΙΙΙ. ΙV. V. Detection - Philosophy & Methods - Direct Detection Detectors - Scintillators - Bolometer - Liquid Noble Gas Detectors Ton scale experiments Summary 2
3 Structure Ι. Introduction - Dark Matter - WIMPs Ι Ι. Detection ΙΙΙ. Detectors ΙV. V. Ton scale experiments Summary 3
4 Ι. Introduction Dark Matter 1933 Fritz Zwicky: Missing Mass Problem mass-to-light ratio of Coma Cluster is not in equilibrium 4
5 Ι. Introduction Dark Matter 1933 Fritz Zwicky: Missing Mass Problem mass-to-light ratio of Coma Cluster is not in equilibrium for 40 years not much happened with this information......since the 1970 s science became interested in DM 5
6 Ι. Introduction Dark Matter Evidence for the existence of Dark Matter 6
7 Ι. Introduction Dark Matter Evidence for the existence of Dark Matter Galaxy Scale Galaxy Cluster Scale 7
8 Ι. Introduction Dark Matter Evidence for the existence of Dark Matter Galaxy Scale rotational v = const. (not ~ 1/r as expected) Galaxy Cluster Scale 8
9 Ι. Introduction Dark Matter Evidence for the existence of Dark Matter Galaxy Scale rotational v = const. (not ~ 1/r as expected) Galaxy Cluster Scale Gravitational Lensing (Analysis of bending of light by galaxy clusters reveals more mass than visible) 9
10 10
11 Ι. Introduction Dark Matter Today we need Dark Matter to explain gravitational motion of Galaxies the structure of the universe and the fate of the universe 11
12 Ι. Introduction Dark Matter Today we need Dark Matter to explain gravitational motion of Galaxies the structure of the universe and the fate of the universe Mother Nature is having a double laugh. She has hidden most of the matter in the universe, and hidden it in a form that can t be seen. Dr Bruce H. Morgan: 12
13 Ι. Introduction Dark Matter Two main categories are considered as possible candidates for Cold Dark Matter MACHOs WIMPs 13
14 Ι. Introduction Dark Matter Two main categories are considered as possible candidates for Cold Dark Matter MACHOs WIMPs 14
15 Ι. Introduction Dark Matter MACHOs WIMPs Massive Astroph Compact Halo Objects Weakly Interacting Massive Particles Detection 15
16 Ι. Introduction Dark Matter MACHOs WIMPs Massive Astroph Compact Halo Objects Weakly Interacting Massive Particles Baryonic non-baryonic big objects: small stars to supermassive Blackholes subatomic particles Detection 16
17 Ι. Introduction Dark Matter MACHOs WIMPs Massive Astroph Compact Halo Objects Weakly Interacting Massive Particles Baryonic non-baryonic big objects: small stars to supermassive Blackholes subatomic particles Astronomy Particle Physics Galaxy Scale Detection Universe 17
18 Ι. Introduction Dark Matter MACHOs WIMPs Massive Astroph Compact Halo Objects Weakly Interacting Massive Particles Baryonic non-baryonic big objects: small stars to supermassive Blackholes subatomic particles Astronomy Particle Physics Galaxy Scale Detection Hubble Space Teleskop & Gravitational Lensis => MACHOs exist, but cannot explain most of the Dark Matter Universe following slides... 18
19 Ι. Introduction WIMPs Majority of Dark Matter is not baryonic: 19
20 Ι. Introduction WIMPs Majority of Dark Matter is not baryonic: Big Bang Nucleosynthesis 20
21 Ι. Introduction WIMPs Majority of Dark Matter is not baryonic: Big Bang Nucleosynthesis & - WMAP 21
22 Ι. Introduction WIMPs SUSY new fundamental space-time symmetry: translate fermions into bosons -> superpartner same quantum numbers, differ in spin by 1/2 22
23 Ι. Introduction WIMPs SUSY new fundamental space-time symmetry: translate fermions into bosons -> superpartner same quantum numbers, differ in spin by 1/2 to prevent proton decay a discrete symmetry (R-parity) is imposed R = (-1)3B+L+2S R = 1 for SM particles, R = -1 for SUSY particles 23
24 Ι. Introduction WIMPs SUSY new fundamental space-time symmetry: translate fermions into bosons -> superpartner same quantum numbers, differ in spin by 1/2 to prevent proton decay a discrete symmetry (R-parity) is imposed R = (-1)3B+L+2S R = 1 for SM particles, R = -1 for SUSY particles the lightest SUSY particle is stable and likely becomes a dark matter candidate 24
25 Ι. Introduction WIMPs WIMP characteristics only interact through weak nuclear force and gravity 25
26 Ι. Introduction WIMPs WIMP characteristics only interact through weak nuclear force and gravity large mass (several GeV - TeV)» slow moving -> cold 26
27 Ι. Introduction WIMPs WIMP characteristics only interact through weak nuclear force and gravity large mass (several GeV - TeV)» slow moving -> cold no interaction with em and strong nuclear force» invisible for usual (em) observations 27
28 Ι. Introduction WIMPs WIMP characteristics only interact through weak nuclear force and gravity large mass (several GeV - TeV)» slow moving -> cold no interaction with em and strong nuclear force» invisible for usual (em) observations simulations universe with CDM -> galaxy distributions similar to really observed 28
29 Structure Ι. Introduction - Dark Matter - WIMPs Ι Ι. Detection - Philosophy & Methods - Direct Detection ΙΙΙ. Detectors ΙV. V. Ton scale experiments Summary 29
30 IΙ. Detection Methods Indirect Detection WIMPs interact with solar protons and Helium nuclei =>WIMP is captured by the sun WIMPs begin to annihilate 30
31 IΙ. Detection Methods Indirect Detection WIMPs interact with solar protons and Helium nuclei =>WIMP is captured by the sun WIMPs begin to annihilate -> propagation of information carriers neutrinos gammas positrons 31
32 IΙ. Detection Methods Indirect Detection Neutrinos (GeV)» Superkamiokande, IceCube Gammas» GLAST satellite Positrons/Antiprotons» Pamela, AMS-02 32
33 IΙ. Detection Methods Accelerators WIMPs -> expected to be produced at LHC, Fermilab rapid decays of heavier supersymmetric partner particles ATLAS/CMS, COUPP 33
34 IΙ. Detection Direct Detection Theory of the possibility to detect WIMPs: WIMPs pass through ordinary matter -> rare WIMP interaction can take place 34
35 IΙ. Detection Direct Detection expected WIMP event rate [event/(kg d)] Strategy: 35
36 IΙ. Detection Direct Detection expected WIMP event rate [event/(kg d)] Strategy: find very sensitive systems scale them up to large volumes => follow the lessons learned from neutrino discovery 36
37 IΙ. Detection Direct Detection expected WIMP event rate [event/(kg d)] Strategy: find very sensitive systems scale them up to large volumes => follow the lessons learned from neutrino discovery elastic scattering of WIMP with target nuclei energy transferred -> resulting nuclear recoil 37
38 IΙ. Detection Direct Detection WIMP signatures WIMP interactions in detector should be nuclear recoils and single scatters Spectral shape recoil spectrum should fall with energy 38
39 IΙ. Detection Direct Detection WIMP signatures WIMP interactions in detector should be nuclear recoils and single scatters Spectral shape recoil spectrum should fall with energy Dependence on material test different target material Annual flux modulation (~ 3 %) Diurnal direction modulation (~ 7 %) 39
40 IΙ. Detection Direct Detection Core Requirements for WIMP detectors low energy threshold» high mass low background 40
41 IΙ. Detection Direct Detection Core Requirements for WIMP detectors low energy threshold» expected recoil energy less than 100 kev high mass» low background 41
42 IΙ. Detection Direct Detection Core Requirements for WIMP detectors low energy threshold» expected recoil energy less than 100 kev high mass» high target mass (~ ton-scale)» high atomic mass of target nuclei (A) low background 42
43 IΙ. Detection Direct Detection Core Requirements for WIMP detectors low energy threshold» expected recoil energy less than 100 kev high mass» high target mass (~ ton-scale)» high atomic mass of target nuclei (A) low background» gamma & neutron shield» low radioactivity of detector materials» deep underground (shield cosmic muons) 43
44 IΙ. Detection Direct Detection Core Requirements for WIMP detectors good background discrimination M. Attisha Dark Matter Searches 44
45 IΙ. Detection Direct Detection Core Requirements for WIMP detectors good background discrimination» reject e-recoils, while maintaining high sensitivity to nuclear recoils M. Attisha Dark Matter Searches 45
46 IΙ. Detection Direct Detection Only few technologies can make use of this physics Cryogenic detectors Noble liquid gas detectors Specific Scintillator detectors 46
47 IΙ. Detection Direct Detection Only few technologies can make use of this physics Cryogenic detectors» Ge, Si, CaWO4 Noble liquid gas detectors» Xe, Ar Specific Scintillator detectors» NaI(TI), CsI(TI) 47
48 IΙ. Detection Direct Detection Only few technologies can make use of this physics 48
49 IΙ. Detection Direct Detection Techniques Phonon collection deposited Energy E produces heat ΔT 49
50 IΙ. Detection Direct Detection Techniques Phonon collection deposited Energy E produces heat ΔT Light collection deposited Energy activates target -> photon emission 50
51 IΙ. Detection Direct Detection Techniques Phonon collection deposited Energy E produces heat ΔT Ionisation Light collection deposited Energy activates target -> photon emission deposited Energy ionises target -> charge 51
52 Structure Ι. Introduction - Dark Matter - WIMPs Ι Ι. ΙΙΙ. ΙV. V. Detection - Philosophy & Methods - Direct Detection Detectors - Scintillators - Bolometer - Liquid Noble Gas Detectors Ton scale experiments Summary 52
53 ΙΙΙ. Detectors Scintillators DAMA/LIBRA at Gran Sasso Laboratory DArk MAtter/Large sodium Iodide Bulk for RAre processes 53
54 ΙΙΙ. Detectors Scintillators DAMA/LIBRA at Gran Sasso Laboratory DArk MAtter/Large sodium Iodide Bulk for RAre processes target-detector mass: ~250 kg highly radiopure NaI(Tl) single phase detector -> Light collection looking for annual modulation of measured signal first results: confirm previous DAMA results 54
55 ΙΙΙ. Detectors Scintillators KIMS (Yangyang Underground Lab South Korea) Korean Invisible Mass Search 55
56 ΙΙΙ. Detectors Scintillators KIMS (Yangyang Underground Lab South Korea) Korean Invisible Mass Search CsI(Tl) crystals 8x8x30 cm3 (8.7 kg) single phase detector -> Light collection good pulse shape discrimination 56
57 ΙΙΙ. Detectors Scintillators KIMS (Yangyang Underground Lab South Korea) Korean Invisible Mass Search CsI(Tl) crystals 8x8x30 cm3 (8.7 kg) single phase detector -> Light collection good pulse shape discrimination 57
58 ΙΙΙ. Detectors Bolometer CRESST at Gran Sasso Laboratory Cryogenic Rare Event Search with Superconducting Thermometer 58
59 ΙΙΙ. Detectors Bolometer CRESST at Gran Sasso Laboratory Cryogenic Rare Event Search with Superconducting Thermometer CaWO4 Crystals: = 4 cm, h = 4 cm, m = 300 g Tc = 8-15 mk Dual phase detector -> Szintillation & Heat 59
60 ΙΙΙ. Detectors Bolometer CDMS at Soudan Mine Cryogenic Dark Matter Search 60
61 ΙΙΙ. Detectors Bolometer CDMS at Soudan Mine Cryogenic Dark Matter Search Ge & Si Crystals: = 7 cm, h = 1 cm, m = 250 g Tc ~ 20 mk; 5 Tower (6 detect. each) Dual phase detector -> charge & heat 61
62 ΙΙΙ. Detectors Bolometer 62
63 ΙΙΙ. Detectors Bolometer Title:output/graph_29279.eps Creator:MATLAB, The Mathworks, Inc. Vers CreationDate:07/16/ :29:41 LanguageLevel:2 Title:output/graph_29279_legend.eps Creator:MATLAB, The Mathworks, Inc. Vers CreationDate:07/16/ :29:42 LanguageLevel:2 63
64 ΙΙΙ. Detectors Liquid Noble Gas Detectors WARP at Gran Sasso Laboratory WIMP Argon Program 64
65 ΙΙΙ. Detectors Liquid Noble Gas Detectors WARP at Gran Sasso Laboratory WIMP Argon Program Dual Phase Detector -> Charge & Light collection 100 l of liquid Argon 65
66 ΙΙΙ. Detectors Liquid Noble Gas Detectors XENON at Gran Sasso Laboratory Dual Phase Detector -> Charge & Light collection 150 kg of liquid Xenon 66
67 ΙΙΙ. Detectors Liquid Noble Gas Detectors XENON Abruzzi, Italy Depth 3800 mwe 67
68 ΙΙΙ. Detectors Liquid Noble Gas Detectors XENON Abruzzi, Italy Depth 3800 mwe 68
69 ΙΙΙ. Detectors Liquid Noble Gas Detectors XENON Abruzzi, Italy Depth 3800 mwe 69
70 ΙΙΙ. Detectors Liquid Noble Gas Detectors XENON100 main detector features 242 Photomultiplier Tubes in Total: 98 in the top PMT array 80 in the bottom array 64 in the veto (top/bottom) 70
71 ΙΙΙ. Detectors Liquid Noble Gas Detectors XENON100 new detector put into Xenon10 shield: 20 cm lead 20 cm poly 5 cm copper 71
72 ΙΙΙ. Detectors Liquid Noble Gas Detectors XENON100: Event Discrimination 72
73 ΙΙΙ. Detectors Liquid Noble Gas Detectors XENON100 first measurements will start soon expect results end of this year 73
74 ΙΙΙ. Detectors Liquid Noble Gas Detectors XENON100 first measurements will start soon expect results end of this year Expect to test cross section of 9 x cm2 (at 100 GeV WIMP mass) 74
75 Recent limits on WIMP-nucleon cross-sections Title:output/graph_30687.eps Creator:MATLAB, The Mathworks, Inc. Vers CreationDate:07/16/ :44:53 LanguageLevel:2 Title:output/graph_30687_legend.eps Creator:MATLAB,The Mathworks, Inc. Vers CreationDate:07/16/ :44:54 LanguageLevel:2 75
76 Structure Ι. Introduction - Dark Matter - WIMPs Ι Ι. ΙΙΙ. ΙV. V. Detection - Philosophy & Methods - Direct Detection Detectors - Scintillators - Bolometer - Liquid Noble Gas Detectors Ton scale experiments Summary 76
77 ΙV. Tonscale Experiments 77
78 Structure Ι. Introduction - Dark Matter - WIMPs Ι Ι. ΙΙΙ. ΙV. V. Detection - Philosophy & Methods - Direct Detection Detectors - Scintillators - Bolometer - Liquid Noble Gas Detectors Ton scale experiments Summary 78
79 V. Summary Majority of matter in universe is non-baryonic WIMPs are one of the best motivated candidates 79
80 V. Summary Majority of matter in universe is non-baryonic WIMPs are one of the best motivated candidates Several experiments all over the world putting effort in the discovery of the lightest SS particle not yet detected... Title:output/graph_30687.eps Creator:MATLAB, The Mathworks, Inc. Vers CreationDate:07/16/ :44:53 LanguageLevel:2 Title:output/graph_30687_legend.eps Creator:MATLAB,The Mathworks, Inc. Vers CreationDate:07/16/ :44:54 LanguageLevel:2 80
81 Backup Results of Xenon10 How to determine WIMPs and not background 81
82 ΙΙΙ. Detectors Results XENON10 WIMP-Search-Run 24/08/06 14/02/07 : 136 kg-days exposure 10 events in WIMP-Search window after all cuts (~7 statistical leakage, expected from gammaband ) 82
83 Backup How to distinguish between WIMPs and background 1. Earth orbital motion around sun implies an expected seasonal modulation in recoil spectrum 2. Because of the galactical orbital motion, we would expect the direction of WIMP events dominantly opposite to our direction of motion 83
84 Ι. Introduction WIMPs WIMP characteristics only interact through weak nuclear force and gravity large mass (several GeV - TeV)» slow moving -> cold no interaction with em and strong nuclear force» invisible for usual (em) observations simulations universe with CDM -> galaxy distributions similar to really observed 84
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