Università degli Studi di Napoli
Federico II
Dark Matter Search in the
form of WIMPs
with the WARP Experiment
In collaboration with:
G. Fiorillo, G. Mangano,
G. Miele
Enrico Borriello,
Valencia,
July 2005
The Dark Matter
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Enrico Borriello, Valencia, July 2005
03
Enrico Borriello, Valencia, July 2005
Composition of the Universe
matter contribution
radiation contribution
dark energy contribution
curvature term
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Enrico Borriello, Valencia, July 2005
Luminous matter
1
Dark matter
100
most of the matter
is non
baryonic
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Enrico Borriello, Valencia, July 2005
Why WIMPS?
(Weakly Interacting Massive Particles)
  stable and massive particle
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Enrico Borriello, Valencia, July 2005
2


 A  Y 
x dY


 1
Yeq dx
H  Yeq 



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Enrico Borriello, Valencia, July 2005
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Enrico Borriello, Valencia, July 2005
MSSM and Dark Matter:
the neutralino
0
0
0
~
~
~
~
  a 1   a 2 Z  a 3H 1  a 4H 2
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Enrico Borriello, Valencia, July 2005
Direct detection of WIMPS
χ
χ
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Enrico Borriello, Valencia, July 2005
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Enrico Borriello, Valencia, July 2005
d  d
 
dER  dER
12

 C0 2 2
  ma x F ( q )
C E R
Enrico Borriello, Valencia, July 2005
f(v ) e
f l( v )  f ( v  v T )  e
13
v 2 / v 0 2
|v v T | 2 / v 0 2
Enrico Borriello, Valencia, July 2005
The modulation
effect
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Enrico Borriello, Valencia, July 2005
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Enrico Borriello, Valencia, July 2005
WARP: WIMP ARgon Programme
INFN e Università di Pavia
R. Brunetti, E. Calligarich, M. Cambiaghi, C. De Vecchi, R. Dolfini, L.
Grandi, A. Menegolli, C. Montanari, M. Prata, A. Rappoldi, G. L.
Raselli, M. Roncadelli, M. Rossella, C. Rubbia,
C. Vignoli
INFN e Università di Napoli
F. Carbonara, A. Cocco, A. Ereditato, G. Fiorillo,
G. Mangano, R. Santorelli
INFN Laboratori Nazionali del Gran Sasso
F.Cavanna, N.Ferrari, O. Palamara
Università di Princeton
C. Galbiati
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Enrico Borriello, Valencia, July 2005
How the measurement
is performed
The ratio of primary over secondary
signal depends on the kind of
particles producing excitation
and ionization
This discrimination method
rules out the backgroung
Induced by gammas and
electrons
Finally, the shielding from neutrons allows to discriminate
WIMP induced interactions
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Enrico Borriello, Valencia, July 2005
2.3 litres sensitivity
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Enrico Borriello, Valencia, July 2005
100 litres sensitivity
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Enrico Borriello, Valencia, July 2005
Preliminary
1
10 1
10 2
10 3
10 4
10 5
10 6
10 7
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Enrico Borriello, Valencia, July 2005