DARWIN. Marc Schumann. U Freiburg LAUNCH 17 Heidelberg, September 15,
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1 DARWIN Marc Schumann U Freiburg LAUNCH 17 Heidelberg, September 15, 2017 marc.schumann@physik.uni-freiburg.de 1
2 Marc Schumann U Freiburg LAUNCH 17 Heidelberg, September 15, 2017 marc.schumann@physik.uni-freiburg.de 2
3 Dark Matter Searches: Status spin-independent WIMP-nucleon interactions XENON1T arxiv: PandaX-II arxiv:
4 Dark Matter Searches: Status spin-independent WIMP-nucleon interactions m 4.5 GeV/c² dominated by LXe TPCs 4
5 Dark Matter Searches: The Future spin-independent WIMP-nucleon interactions some projects are missing... 5
6 Dark Matter Searches: The Future spin-independent WIMP-nucleon interactions??? some projects are missing... 6
7 Dark Matter Searches: The Limit spin-independent WIMP-nucleon interactions neutrino floor PRD 89, (2014) some projects are missing... 7
8 Dark Matter Searches: The Limit JCAP 01, 044 (2014) spin-independent WIMP-nucleon interactions neutrino floor PRD 89, (2014) Interactions from coherent neutrino-nucleus scattering (CNNS) will dominate ultimate background for direct detection 8
9 Dark Matter Searches: The Limit JCAP 01, 044 (2014) spin-independent WIMP-nucleon interactions SNS neutrino floor PRD 89, (2014) Interactions from coherent neutrino-nucleus scattering (CNNS) will dominate ultimate background for direct detection 9
10 DARWIN The ultimate WIMP Detector spin-independent WIMP-nucleon interactions neutrino floor PRD 89, (2014) IN DARW Exposure 0.1 t y 2 t y 20 t y 200 t y some projects are missing... 11
11 Detector? Dual Phase Xenon TPC TPC = Time Projection Chamber E~10 kv/cm Amplitude pos HV Dark Matter WIMP = single scatter nuclear recoil S1 Light S2 Charge proportional scintillation Amplitude Time Background (β, γ) Time E~0.5 kv/cm 3d position reconstruction target fiducialization background rejection Amplitude neg HV Background (neutron) Time 125
12 Background Sources muons muoninduced neutrons pp+7be neutrinos ER signature high-e neutrinos CNNS bg NR signature neutrons from (α,n) and sf natural γ-bg natural γ-bg neutrons from (α,n) and sf Xe-intrinsic bg: 222 Rn, 85Kr, 2νββ Electronic Recoils Nuclear Recoils (gamma, beta) (neutron, WIMPs) 13 only single scatters
13 DARWIN Backgrounds pp+7be neutrinos ER signature high-e neutrinos CNNS bg NR signature Remaining background sources: Neutrinos ( ERs and NRs) Detector materials ( γ, n) Xe-intrinsic isotopes ( e ) (assume 100% effective shield (~15m) against µ-induced background) JCAP 10, 016 (2015) γ-bg materials neutrons from (α,n) and sf Xe-intrinsic bg: 222 Rn, 85Kr, 2νββ Electronic Recoils Nuclear Recoils (gamma, beta) (neutron, WIMPs) 14 only single scatters
14 Backgrounds JCAP 10, 016 (2015) All relevant backgrounds are considered: MC simulation of detector made of main components (PTFE, CU, PMTs): subdominant after ~15 cm fiducial cut 85 Kr: 2x below XENON1T design (0.03 ppt achieved: EPJ C 74 (2014) 2746) Rn: 100x below XENON1T design 136 Xe: assume natural xenon 222 consider all relevant neutrinos exposure: 200 t x y low-e solar neutrinos dominate ER backgrounds......if 222Rn sufficiently low at rejection levels 99.95%, NRs from CNNS dominate 15
15 DARWIN WIMP Sensitivity exposure: 200 t y; all backgrounds included likelihood analysis JCAP 10, 016 (2015) 99.98% ER 30% NR acceptance, S1+S2 combined energy scale, LY=8 PE/keV, 5-35 kevnr energy window spin-independent couplings spin-dependent couplings (n-only) 200 t y: σ < 2.5 x GeV/c² excellent complementarity to LHC searches Phys.Dark Univ. 9-10, 51 (2015). 18
16 SUSY Dark Matter plots: Sven Heinemeyer (MasterCode 2015) SUSY under pressure because not found at LHC? true for some very constraint models (CMSSM etc.) but looks different when more parameters are left unconstrained Example: pmssm10 10 SUSY parameters, e.g. EPJ C75, 422 (2015) IN RW A D WIMP mneutralino mchargino WIMP out of reach of HL-LHC (best-fit regions not covered), but accessible by DARWIN 19
17 WIMP Detection ER-like (background) discrimination variable; based on S2/S1 DARWIN with 30t LXe fiducial target NR-like (signal) reconstructed energy, based on S1 and S2 signal 20
18 WIMP Detection 60 days 21
19 WIMP Detection 1 year 22
20 WIMP Detection 2 years 23
21 WIMP Detection 3 years 24
22 WIMP Detection 5 years 25
23 WIMP Detection exposure goal 6.7 years 26
24 WIMP Detection solar neutrinos, 85 Kr, 222Rn, 2νββ, materials WIMP: 30 GeV/c², = cm² 40 signal events in box CNNS+neutrons 27
25 WIMP Spectroscopy Reconstruction: cm² Target Complementarity 200 t y JCAP 11, 017 (2016) Capability to reconstruct WIMP parameters m =20, 100, 500 GeV/c² χ 1σ/2σ CI, marginalized over astrophysical parameters due to flat WIMP spectra, no target can reconstruct masses >500 GeV/c² PRD 83, (2011) Reconstruction improves considerably by adding Ge-data to Xe. Only minimal improvement for Ar. 28
26 DARWIN The ultimate WIMP Detector JCAP 11, 017 (2016) aim at sensitivity of a few cm², limited by irreducible ν-backgrounds international consortium, 24 groups R&D ongoing Baseline scenario ~50t total LXe mass ~40 t LXe TPC ~30 t fiducial mass 260 cm Timescale: start after XENONnT 29
27 DARWIN Collaboration 2010 Zürich 2017 Freiburg 30
28 96 cm 31 10
29 DARWIN The ultimate WIMP Detector JCAP 11, 017 (2016) Challenges 260 cm Size electron drift (HV) diameter (TPC electrodes) mass (LXe purification) dimensions (radioactivity) detector response (calibration, corrections) Backgrounds 222Rn: factor 100 required (α,n) neutrons (from PTFE) Photosensors high light yield (QE) low radioactivity long-term stability etc etc R&D within XENON collaboration new: two ERC projects ULTIMATE (Freiburg) Xenoscope (Zürich) 32
30 DARWIN The ultimate WIMP Detector other than WIMPs 260 cm What (else) can we do with these instruments? 33
31 Interactions in LXe Detectors from XENON100 34
32 Interactions in LXe Detectors coherent scattering off xenon nucleus nuclear recoil Dark Matter CNNS SM process, not yet measured. Deviation from expectation new physics? 35
33 Interactions in LXe Detectors scattering off atomic electrons, excitations etc. electronic recoil rare processes detectable if ER background is low coherent scattering off xenon nucleus nuclear recoil Dark Matter CNNS Many science channels are accessible with a multi-ton DARWIN detector thanks to its extremly low ER background. 36
34 Solar Axions, Dark Matter ALPs JCAP 11, 017 (2016) Solar axions Axions and ALPs couple to xenon via axio-electric-effect axion ionizes a Xe atom Galactic ALPs Axion arises naturally in the Peccei-Quinn solution of the strong CP-problem well-motivated dark matter candidate Axion-like particle (ALP) generalization of the axion concept, but without addressing strong CP problem (ALPs = Nambu-Goldstone bosons from breaking of some global symmetry) 37
35 Solar Axions, Dark Matter ALPs JCAP 11, 017 (2016) Solar axions Galactic ALPs XENON100: PRD 90, (2014) Axions and ALPs couple to xenon via axio-electric-effect axion ionizes a Xe atom Axion arises naturally in the Peccei-Quinn solution of the strong CP-problem well-motivated dark matter candidate Axion-like particle (ALP) generalization of the axion concept, but without addressing strong CP problem (ALPs = Nambu-Goldstone bosons from breaking of some global symmetry) 38
36 39
37 pp-neutrinos in DARWIN JCAP 01, 044 (2014) Differential Recoil Spectrum in Xe neutrinos interact with Xe electrons electronic recoil signature continuous recoil spectrum largest rate at low E 40
38 pp-neutrinos in DARWIN JCAP 11, 017 (2016) a background for the WIMP search Neutrino interactions Differential Recoil Spectrum in Xe neutrinos interact with Xe electrons electronic recoil signature continuous recoil spectrum largest rate at low E ER rejection efficiencies ~99.98% at 30% NR efficiency are required to reduce to sub-dominant level 41
39 pp-neutrinos in DARWIN JCAP 11, 017 (2016) a new physics channel! Neutrino interactions Differential Recoil Spectrum in Xe neutrinos interact with Xe electrons electronic recoil signature continuous recoil spectrum largest rate at low E ~0.26 ν evts/t/d in low-e region (2-30 kev) 30t target mass, 2-30 kev window 2850 neutrinos per year (89% pp) achieve 1% statistical precision on pp-flux ( Pee) with 100 t x y 42
40 0ν Double-beta Decay JCAP 11, 017 (2016) 43
41 Supernova Neutrinos Chakraborty et al., PRD 89, (2014) Lang et al., PRD 94, (2016) ν from supernovae could be detected via CNNS as well signal fom accretion phase of a ~18 Msun 10 kpc is clearly visible in DARWIN signal: NRs plus precise time information information on total energy loss in neutrinos complementary to larger detectors accretion phase 44
42 DARWIN exciting prospects Science with a 40 t LXe TPC Nuclear Recoil Interactions WIMP dark matter JCAP 10, 016 (2015) spin-independent mid/high mass spin-dependent complementary with LHC, indirect search various inelastic models (χ, n, MiDM, ) Coherent neutrino-nucleon scattering (CNNS) 8B neutrinos (low E), atmospheric (high E) supernova neutrinos PRD 89, (2014), PRD 94, (2016) Electronic Recoil Interactions Non-WIMP dark matter and neutrino physics axions, ALPs JCAP 1611, 017 (2016) sterile neutrinos pp, 7Be: precision flux measurements <1% Rare nuclear events 0νββ (136Xe), 2νEC (134Xe),... JCAP 01, 044 (2014) JCAP 01, 044 (2014) 45
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