Looking for SUSY… with · G. Gerbier TAUP03-Seattle-6 /09/2003 1 Looking for SUSY… G. Gerbier...
Transcript of Looking for SUSY… with · G. Gerbier TAUP03-Seattle-6 /09/2003 1 Looking for SUSY… G. Gerbier...
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G. Gerbier TAUP03-Seattle-6 /09/2003 1
Looking for SUSY…
G. GerbierCEA/Saclay, DAPNIA
Fréjus Laboratory, CEA/CNRS
with
- Status- Prospects Edelweiss I
Edelweiss II
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G. Gerbier TAUP03-Seattle-6 /09/2003 2
-EDELWEISS Collaboration -CEA-Saclay DAPNIA and DRECAMCRTBT GrenobleCSNSM OrsayIAP ParisIPN LyonFZ-Karlsruhe and Univ. Karlsruhe Exp intalled in Modane Underground Laboratory (Fréjus Lab)
4800 mwe, 1700 m of rock- m flux = 4/m2/d- neutron flux = 1.6 10-6/s/cm2
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G. Gerbier TAUP03-Seattle-6 /09/2003 3
1kg stage of EDELWEISS I : 3 * 320 g Ge.•• GGA1: GGA1: heat and heat and ionisation ionisation Ge Ge 320320gram dgram detector etector , 20 mm , 20 mm thickthick•• Aluminium Aluminium electrodes (electrodes (center +center +gguard uard ringring)) + + Ge Ge aamorphous morphous layerlayer((built built by Canberra/by Canberra/EurysisEurysis))•• NTD NTD sensor glued sensor glued on on guard guard ringringelectrode electrode + + wiring wiring in Saclayin Saclay•• ««All All numericalnumerical!!»» acquisition acquisition•• L Low ow radioactivity radioactivity cryostatcryostat•• ShieldShield: 30 cm : 30 cm paraffinparaffin, 20 cm Pb, 10, 20 cm Pb, 10cm cm CuCu
•• Resolutions Resolutions @ 10 @ 10 keV keV ((resp resp 122) 122) keVkeV::•• ionisation ionisation : 1.3 : 1.3 keVkeV (2.2 (2.2 keVkeV))•• heat heat : : 1.0 1.0 keVkeV (3.0 (3.0 keVkeV))
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G. Gerbier TAUP03-Seattle-6 /09/2003 4
Close shield in Roman Pb1st data taking: Fall 2000, 1 detector mounted and used2nd data taking : First semester 2002, 1 detector used out of 33rd data taking : October 2002 - March 2003, 3 detectors used
ArcheologicalArcheologicalleadlead
3 * 320 g Ge detectors3 * 320 g Ge detectors
May 2002May 2002GGA1,GeAl9,GeAl10GGA1,GeAl9,GeAl10October 2002October 2002GGA3, GSA1, GSA3GGA3, GSA1, GSA3
1kg stage of EDELWEISS I : 3 * 320 g Ge.
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Am-Be neutronsource in situ
73Ge(n,n’g)
Ionization threshold3.7 keV
Recoil threshold20 keV
Q=
Neutron calibration
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G. Gerbier TAUP03-Seattle-6 /09/2003 6
GSA1 gamma calibration
Q=
g-ray rejection >≈ 99.99 % =>
run started after extendedgamma-ray detector exposure
Calib run equivalent to 60days running time w/outsource <=> 9 kg.d exposure
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G. Gerbier TAUP03-Seattle-6 /09/2003 7
EDELWEISS-I latest resultsoct 2002 – may 2003
• Additional 20 kg ¥ day fiducial exposure with 3 detectors
• Two events compatible with nuclear recoils– recorded during short noisy period
• Present total exposure: 13.8 kg ¥ day @ Erec">"20 keV, 30.5 kg ¥ day @ Erec">"30 keV
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Bolometer-1: Q = f(Er) diagram
Noisy period "?
The 4 events in red (1inside and 3 outside theneutron zone) all arrivedwithin an interval of afew days out of 90 daystotal acq time
-Exposure:7.51 kg ¥day (fiducial)-Best charge channel100 % e at 20 keV
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G. Gerbier TAUP03-Seattle-6 /09/2003 9
Bolometer-3: Q = f(Er) diagram
-Exposure: 10.85 kg ¥day fiducial
-Excellent phononchannel: 300 eV FWHMresolution during mostof the runs, noisy chargechannel
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How well do we measurerecoil energy ? «"Heat Quenching factor"»
- We assume above that energy measuredfrom heat signal is total deposited energyi.e. Eh electron = Eh nucl rec i.e. Qh =1 . Is that true ?
-Take Qh =0.95 and check what becomesquenching factor Qi curve
-Compare with data from litteraturefiQh is 1 +- 0.05fiEtot known within 5 %
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0.15
0.2
0.25
0.3
0.35
0.4
20 40 60 80 100
Quenching factor summary on Ge
Q(Lindhard)Q(Chas)Q(Shu)Q(Messous)Q(fit)
Que
nchi
ng f
acto
r
Recoil energy (keV)
=> Measur. of Qh can be sone of order 1 +- .05 from present analysis : in progress
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WIMP s vs M exclusion diagram
• Keep 2 evts as potential signaland set upper limits on WIMPsignal
• Correct for :– Fiducial volume (known 5 %)– Efficiencies : nucl. rec, fraction
of Wimp signal kept• Trigger eff. =100 % > threshold• No background subtraction• Same conventional halo, nucl.
phys. parameters as DAMA• Excludes DAMA candidate at
99.8% C.L.• Compatibility with DAMA ?
– Copi and Krauss": (Phys.Rev. D67(2003) 103507) exclusion is modelindependent
– DAMA data internal consistency? CDMSZEPLIN Prel
EDELWEISS
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G. Gerbier TAUP03-Seattle-6 /09/2003 13
DAMA : Questions of rate budget, PSD analysis
The detected signal is the modulated part Sm = 0.02 evts/kg/d => total WIMP signal S0 (2-6 keV) is-no constaint from NaI0 = 0.86 evts/kg/d-wth constaint from NaI0 =0.54 evts/kg/d
0.02-0.025 mod signal0.5 0.2 0.1 0.03 bulk signal nucl recoils1.0 1.8 1.8 1.7 total rate0.5 1.6 1.6 1.6 em backg
DAMA Phys Lett B 480 (2000) 23
Annual Modulation is < 7 % of unmodulated partfiUnmodulated «!bulk!» > 0.02/ 7 % = 0.3-0.5 cpd/kg/kevDependent only on relative velocities of earth/sun: knownShape is given by WIMP velocity:known (even if directional)
=>2 implicationsfiem background has rising shape (even 0 in 2-3 keV in cryst. 8)fiPSD, but much more efficient in 4-6 keV, expect a 8 s effect in 100 000 kg.d if pure stat( too small discr. in 2-4 keV)
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EDELWEISS": what’s next"?• New run started with improved energy threshold with
≈100% detection efficiency at 15 keV recoil energy(phonon trigger)
• In hand further additional 20 kg.d analysis in progress• But close to exp level of neutron background (1 evt/60 kg.d)
• December 2003 : end EDELWEISS-I run
• Jan-Dec 2004 : install EDELWEISS-II with– 21 ¥ 320 g Ge-NTD detectors and– 7 «!thin film!» 200 g Ge detectors : 9 kg
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G. Gerbier TAUP03-Seattle-6 /09/2003 15
EDELWEISS-II detector setup(Phase 28 detectors - 8 kg- in preparation )
- 100 liter cryostat for up to120 detectors : ≈ 36 kg Ge
- Development of Nb Si thin filmsensors to eliminate surfaceevents
- Clean crystal manufacturing- Clean room + radon reducedatmosphere ~ 0.1 Bq/m3
- Improve sensitivity by ≈!100
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New 100-liter dilution cryostat :8-10 mK obtained during several runsWiring and cold electronic test : summer 2003
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G. Gerbier TAUP03-Seattle-6 /09/2003 17
Experimental aims andtheoretical predictions
L. Rozkowski et al.,hep-ph/0208069
EDELWEISS-II sensitivity goal
1 Ton sensitivity goal (optimistic)
EDELWEISS-I present
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G. Gerbier TAUP03-Seattle-6 /09/2003 18
Conclusions
• Exclusion diagram of 2002 confirmed by 2003 data• EDELWEISS sensitive to -optimistic- SUSY models (≈10-6
pbarn)• EDELWEISS-II should be ready by 2005 to get factor ≈100
improvement in sensitivity (down to few 10-8 pbarn) andbegin to test more favored models (like CDMS-II, CRESST-II, ZEPLIN-II and -III)
• Testing the bulk of SUSY parameter space(down to 10-10 pbarn) will require experiments in the one-tonrange and extreme background rejection
• European supported programs will start soon