Direct detection of Dark Matter with the EDELWEISS experiment J. Billard on behalf of the EDELWEISS collaboration Institut de Physique Nucléaire de Lyon / CNRS / Université Lyon 1 Journée Matière Noire, APC 1er Décembre, 2016 1
The neutrino background J. Billard et al., PRD 89 (2014) �� - �� �� - � C D D A M M �� - �� �� - � I C S ( 2 ) 0 1 2 l i t e �� - �� ( �� - � CoGeNT 2 0 ���� - ������� ����� ������� [ �� � ] (2012) 1 ���� - ������� ����� ������� [ �� ] 3 ) �� - �� CDMS Si �� - � S (2013) u ) 2 1 p 0 2 ( E e L P M �� - �� r I 2 ) S �� - � ) 1 4 0 C 1 2 0 DAMA ( 2 P ( P T D S U S O E C ) R 2 1 M C 0 2 ( I I I - N S CRESST I L �� - �� �� - � P E Z 9 ) 0 L 0 2 T ( e G ( 2 I I S 0 M ) 1 D 2 EDELWEISS (2011) C 1 4 0 ) 2 ( �� - �� �� - � 0 0 1 n o n e O O X C C H H ) E E 3 1 R E R E 0 2 ( X U N T N T L 7 Be �� - �� �� - � N N E E Neutrinos U U E E TT TT R I R I T R T R A A C C I N I N N N S S O O G G 8 B �� - �� �� - � Neutrinos �� - �� �� - �� C OHE R E NT NEU C OHE R E NT NEU �� - �� �� - �� N O SC AT TER I N G N O SC AT TER I N G T R I T R I �� - �� �� - �� E U E U Atmospheric and DSNB Neutrinos N N T T N N R E R E E E H H O O C C T R T R G G N N �� - �� �� - �� I I R R I I N O N O E E T T A T A T S S C C �� - �� �� - �� � �� ��� ���� �� � 2 ���� ���� [ ��� / � � ] Julien Billard (IPNL) - APC
The neutrino background J. Billard et al., PRD 89 (2014) �� - �� �� - � C D D A M M �� - �� �� - � I C S ( 2 ) 0 1 2 l i t e �� - �� ( �� - � CoGeNT 2 0 ���� - ������� ����� ������� [ �� � ] (2012) 1 ���� - ������� ����� ������� [ �� ] 3 ) �� - �� CDMS Si �� - � S (2013) u ) 2 1 p 0 2 ( E e L P Low M �� - �� r I 2 ) S �� - � ) 1 4 0 C 1 2 0 DAMA ( 2 P ( P T D S U S O E C ) R 2 1 M C 0 2 ( I I I WIMP mass - N S CRESST I L �� - �� �� - � P E Z 9 ) 0 L 0 2 T ( e G ( 2 I I S 0 M ) 1 D 2 EDELWEISS (2011) C 1 4 0 ) 2 ( �� - �� �� - � 0 0 1 n o n e O O X C C H H ) E E 3 1 R E R E 0 2 ( X U N T N T L 7 Be �� - �� �� - � N N E E Neutrinos U U E E TT TT R I R I T R T R A A C C I N I N N N S S O O G G 8 B �� - �� �� - � Neutrinos High WIMP mass �� - �� �� - �� C OHE R E NT NEU C OHE R E NT NEU �� - �� �� - �� N O SC AT TER I N G N O SC AT TER I N G T R I T R I �� - �� �� - �� E U E U Atmospheric and DSNB Neutrinos N N T T N N R E R E E E H H O O C C T R T R G G N N �� - �� �� - �� I I R R I I N O N O E E T T A T A T S S C C �� - �� �� - �� � �� ��� ���� �� � 2 ���� ���� [ ��� / � � ] Julien Billard (IPNL) - APC
The neutrino background J. Billard et al., PRD 89 (2014) �� - �� �� - � C D D A M M �� - �� �� - � I C S ( 2 ) 0 1 2 l i t e �� - �� ( �� - � CoGeNT 2 0 ���� - ������� ����� ������� [ �� � ] (2012) 1 ���� - ������� ����� ������� [ �� ] 3 ) �� - �� CDMS Si �� - � S (2013) u ) 2 1 p 0 2 ( E e L P M �� - �� r I 2 ) S �� - � ) 1 4 0 C 1 2 0 DAMA ( 2 P ( P T D S U S O E C ) R 2 1 M C 0 2 ( I I I - N S CRESST I L �� - �� �� - � P E Z 9 ) 0 L 0 2 T ( e G ( 2 I I S 0 M ) cryogenic crystals 1 D 2 EDELWEISS (2011) C 1 4 0 ) 2 ( �� - �� �� - � 0 0 1 n o n e O O X C C H H ) E E 3 1 R E R E 0 2 ( X U N T N T L 7 Be �� - �� �� - � N N E E Neutrinos U U E E TT TT R I R I T R T R A A C C I N I N N N S S O O G G 8 B �� - �� �� - � Neutrinos �� - �� �� - �� liquid noble gases C OHE R E NT NEU C OHE R E NT NEU �� - �� �� - �� N O SC AT TER I N G N O SC AT TER I N G T R I T R I �� - �� �� - �� E U E U Atmospheric and DSNB Neutrinos N N T T N N R E R E E E H H O O C C T R T R G G N N �� - �� �� - �� I I R R I I N O N O E E T T A T A T S S C C �� - �� �� - �� � �� ��� ���� �� � 3 ���� ���� [ ��� / � � ] Julien Billard (IPNL) - APC
The EDELWEISS-III Experiment CNRS/IN2P3 CNRS/IN2P3 CNRS/INP CNRS CEA/IRFU CEA/IRAMIS IKP EKP IPE JINR DUBNA Univ. OXFORD Univ. SHEFFIELD 10 institutions 4 http://edelweiss.in2p3.fr Julien Billard (IPNL) - APC
The EDELWEISS-III Experiment WIMP Cryogenic semiconductor detectors looking for WIMPs 5 Julien Billard (IPNL) - APC
The EDELWEISS-III Experiment WIMP Charge/Phonon sensors WIMP E field Charge/Phonon sensors 6 Julien Billard (IPNL) - APC
The EDELWEISS-III Experiment Charge/Phonon sensors h+ prompt phonons E field e- e- Charge/Phonon sensors 7 Julien Billard (IPNL) - APC
The EDELWEISS-III Experiment Charge/Phonon sensors h+ prompt phonons E field e- e- Charge/Phonon sensors E total = E recoil + E luke = E recoil + 1 E Q Δ V 3 eV 8 Julien Billard (IPNL) - APC
The EDELWEISS-III Experiment EDELWEISS setup • Clean room • Radon-free air around the detectors • To reduce surface contamination with radioactive contaminants • Two layers of lead shield • To stop the gammas • Standard (far from detectors) • Ancient (near the detectors) • Inner and outer polyethylene shield • To stop the neutrons • Muon veto • To suppress muon induced neutrons in surrounding materials 9 Julien Billard (IPNL) - APC
The EDELWEISS-III Experiment Upgrade from EDELWEISS-II: • • Extra 10 cm internal PE shield • New electronics • Cryogenics (Vibrations) 10 Julien Billard (IPNL) - APC
The EDELWEISS-III Experiment Upgrade from EDELWEISS-II: • • Extra 10 cm internal PE shield • New electronics • Cryogenics (Vibrations) New FID800 (850g) germanium detectors • measure both ionization and heat 10 Julien Billard (IPNL) - APC
The EDELWEISS-III Experiment Upgrade from EDELWEISS-II: • • Extra 10 cm internal PE shield • New electronics • Cryogenics (Vibrations) C 1 +4 V V 1 -1.5 V NTD New FID800 (850g) germanium detectors • measure both ionization and heat Interdigitized electrodes for surface event • rejection from both top/bottom surfaces and sidewall (600g of fiducial mass) NTD V 2 +1.5 V C 2 -4 V 10 Julien Billard (IPNL) - APC
The EDELWEISS-III Experiment Upgrade from EDELWEISS-II: • • Extra 10 cm internal PE shield • New electronics • Cryogenics (Vibrations) New FID800 (850g) germanium detectors • measure both ionization and heat Interdigitized electrodes for surface event • rejection from both top/bottom surfaces and sidewall (600g of fiducial mass) Nuclear/Electron recoil discrimination from • simultaneous heat and ionization measurements 10 Julien Billard (IPNL) - APC
The EDELWEISS-III Experiment Upgrade from EDELWEISS-II: • • Extra 10 cm internal PE shield • New electronics • Cryogenics (Vibrations) New FID800 (850g) germanium detectors • measure both ionization and heat Interdigitized electrodes for surface event • rejection from both top/bottom surfaces and sidewall (600g of fiducial mass) Nuclear/Electron recoil discrimination from • simultaneous heat and ionization measurements Original design (ANR FIDSUSY 2010): • 20 kg of Ge target, 161 days of DM data • Largest bolometer array for direct detection • Initial physics goal: WIMP masses > 20 GeV, σ ~ 10 -9 pb, ~3000 kg.day • 10 Technical paper: EDELWEISS Coll., to be submitted soon Julien Billard (IPNL) - APC
Strategies for Light WIMP Searches Lowering the energy threshold is the key for light WIMP searches ] -1 Event rate [(ton.year.keV) 5 GeV WIMP 2 7 GeV WIMP 10 10 GeV WIMP 10 1 -1 10 0 2 4 6 8 10 12 Recoil energy [keV] 1. Low Threshold analysis : Improve exposure and extend background ID to low energy 11 Julien Billard (IPNL) - APC
Low Threshold analysis Lowering the analysis thresholds down to the experiment’s trigger thresholds Use 8 detectors with lowest trigger thresholds (4 @ 2.4 keVnr and 4 @ 3.6 keVnr) • 582 kg-d of fiducial exposure (August. 2014 - March 2015) • 2 analyses in parallel optimized for exclusion: BDT and Likelihood • Sidebands Data Background BDT/Likelihood model Upper limit WIMP model 12 Julien Billard (IPNL) - APC
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