Silicon detector dark matter results from the final exposure of CDMS II.
We report results of a search for weakly interacting massive particles (WIMPS) with the silicon detectors of the CDMS II experiment. This blind analysis of 140.2 kg day of data taken between July 2007 and September 2008 revealed three WIMP-candidate events with a surface-event background estimate of 0.41(-0.08)(+0.20)(stat)(-0.24)(+0.28)(syst). Other known backgrounds from neutrons and 206Pb are limited to <0.13 and <0.08 events at the 90% confidence level, respectively. The exposure of this analysis is equivalent to 23.4 kg day for a recoil energy range of 7-100 keV for a WIMP of mass 10  GeV/c2. The probability that the known backgrounds would produce three or more events in the signal region is 5.4%. A profile likelihood ratio test of the three events that includes the measured recoil energies gives a 0.19% probability for the known-background-only hypothesis when tested against the alternative WIMP+background hypothesis. The highest likelihood occurs for a WIMP mass of 8.6  GeV/c2 and WIMP-nucleon cross section of 1.9×10(-41)  cm2.
Department of Physics, University of Florida, Gainesville, Florida 32611, USA.
R
R
Agnese
Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena, California 91125, USA.
Z
Z
Ahmed
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
A J
AJ
Anderson
Physics Institute, University of Zürich, Winterthurerstrasse 190, CH-8057, Switzerland.
S
S
Arrenberg
Department of Physics, University of Florida, Gainesville, Florida 32611, USA.
D
D
Balakishiyeva
Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA.
R
R
Basu Thakur
Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA.
D A
DA
Bauer
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
J
J
Billard
SLAC National Accelerator Laboratory/Kavli Institute for Particle Astrophysics and Cosmology, Menlo Park, California 94025, USA.
A
A
Borgland
SLAC National Accelerator Laboratory/Kavli Institute for Particle Astrophysics and Cosmology, Menlo Park, California 94025, USA.
D
D
Brandt
SLAC National Accelerator Laboratory/Kavli Institute for Particle Astrophysics and Cosmology, Menlo Park, California 94025, USA.
P L
PL
Brink
Physics Institute, University of Zürich, Winterthurerstrasse 190, CH-8057, Switzerland.
T
T
Bruch
Department of Physics, Syracuse University, Syracuse, New York 13244, USA.
R
R
Bunker
Department of Physics, Stanford University, Stanford, California 94305, USA.
B
B
Cabrera
Department of Physics, University of California, Santa Barbara, California 93106, USA.
D O
DO
Caldwell
Departamento de Física Teórica and Instituto de Física Teórica UAM/CSIC, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
D G
DG
Cerdeno
School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
H
H
Chagani
Department of Physics, Southern Methodist University, Dallas, Texas 75275, USA.
J
J
Cooley
Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena, California 91125, USA.
B
B
Cornell
Department of Physics, Queen's University, Kingston, Ontario K7L 3N6, Canada.
C H
CH
Crewdson
School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
P
P
Cushman
Department of Physics, University of California, Berkeley, California 94720, USA.
M
M
Daal
Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA.
F
F
Dejongh
SLAC National Accelerator Laboratory/Kavli Institute for Particle Astrophysics and Cosmology, Menlo Park, California 94025, USA.
E
E
do Couto e Silva
Department of Physics, University of California, Berkeley, California 94720, USA.
T
T
Doughty
Departamento de Física Teórica and Instituto de Física Teórica UAM/CSIC, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
L
L
Esteban
School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
S
S
Fallows
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
E
E
Figueroa-Feliciano
Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena, California 91125, USA.
J
J
Filippini
Department of Physics, Queen's University, Kingston, Ontario K7L 3N6, Canada.
J
J
Fox
School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
M
M
Fritts
SLAC National Accelerator Laboratory/Kavli Institute for Particle Astrophysics and Cosmology, Menlo Park, California 94025, USA.
G L
GL
Godfrey
Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena, California 91125, USA.
S R
SR
Golwala
Pacific Northwest National Laboratory, Richland, Washington 99352, USA.
J
J
Hall
Department of Physics, Texas A&M University, College Station, Texas 77843, USA.
R H
RH
Harris
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
S A
SA
Hertel
School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
T
T
Hofer
Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA.
D
D
Holmgren
Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA.
L
L
Hsu
Department of Physics, University of Colorado, Denver, Colorado 80217, USA.
M E
ME
Huber
Department of Physics, Texas A&M University, College Station, Texas 77843, USA.
A
A
Jastram
Department of Physics, Queen's University, Kingston, Ontario K7L 3N6, Canada.
O
O
Kamaev
Department of Physics, Southern Methodist University, Dallas, Texas 75275, USA.
B
B
Kara
SLAC National Accelerator Laboratory/Kavli Institute for Particle Astrophysics and Cosmology, Menlo Park, California 94025, USA.
M H
MH
Kelsey
School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
A
A
Kennedy
SLAC National Accelerator Laboratory/Kavli Institute for Particle Astrophysics and Cosmology, Menlo Park, California 94025, USA.
P
P
Kim
Department of Physics, Syracuse University, Syracuse, New York 13244, USA.
M
M
Kiveni
School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
K
K
Koch
Department of Physics, Syracuse University, Syracuse, New York 13244, USA.
M
M
Kos
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
S W
SW
Leman
Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA.
B
B
Loer
Departamento de Física Teórica and Instituto de Física Teórica UAM/CSIC, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
E
E
Lopez Asamar
Department of Physics, Texas A&M University, College Station, Texas 77843, USA.
R
R
Mahapatra
School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
V
V
Mandic
Department of Physics, Queen's University, Kingston, Ontario K7L 3N6, Canada.
C
C
Martinez
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
K A
KA
McCarthy
Department of Physics, University of California, Berkeley, California 94720, USA.
N
N
Mirabolfathi
Department of Physics, Stanford University, Stanford, California 94305, USA.
R A
RA
Moffatt
Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena, California 91125, USA.
D C
DC
Moore
Department of Physics, Queen's University, Kingston, Ontario K7L 3N6, Canada.
P
P
Nadeau
Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena, California 91125, USA.
R H
RH
Nelson
Department of Physics, Queen's University, Kingston, Ontario K7L 3N6, Canada.
K
K
Page
SLAC National Accelerator Laboratory/Kavli Institute for Particle Astrophysics and Cosmology, Menlo Park, California 94025, USA.
R
R
Partridge
School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
M
M
Pepin
Department of Physics, University of California, Berkeley, California 94720, USA.
A
A
Phipps
Department of Physics, Texas A&M University, College Station, Texas 77843, USA.
K
K
Prasad
Department of Physics, University of California, Berkeley, California 94720, USA.
M
M
Pyle
Department of Physics, Southern Methodist University, Dallas, Texas 75275, USA.
H
H
Qiu
Department of Physics, Queen's University, Kingston, Ontario K7L 3N6, Canada.
W
W
Rau
Department of Physics, Stanford University, Stanford, California 94305, USA.
P
P
Redl
Department of Physics, University of Evansville, Evansville, Indiana 47722, USA.
A
A
Reisetter
Department of Physics, Queen's University, Kingston, Ontario K7L 3N6, Canada.
Y
Y
Ricci
Department of Physics, University of Florida, Gainesville, Florida 32611, USA.
T
T
Saab
Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA and Department of Physics, University of California, Berkeley, California 94720, USA.
B
B
Sadoulet
Department of Physics, Texas A&M University, College Station, Texas 77843, USA.
J
J
Sander
SLAC National Accelerator Laboratory/Kavli Institute for Particle Astrophysics and Cosmology, Menlo Park, California 94025, USA.
K
K
Schneck
Department of Physics, Syracuse University, Syracuse, New York 13244, USA.
R W
RW
Schnee
Department of Physics, Southern Methodist University, Dallas, Texas 75275, USA.
S
S
Scorza
Department of Physics, University of California, Berkeley, California 94720, USA.
B
B
Serfass
Department of Physics, Stanford University, Stanford, California 94305, USA.
B
B
Shank
Department of Physics, University of California, Berkeley, California 94720, USA.
D
D
Speller
Department of Physics, University of California, Berkeley, California 94720, USA.
K M
KM
Sundqvist
School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
A N
AN
Villano
Department of Physics, University of Florida, Gainesville, Florida 32611, USA.
B
B
Welliver
SLAC National Accelerator Laboratory/Kavli Institute for Particle Astrophysics and Cosmology, Menlo Park, California 94025, USA.
D H
DH
Wright
Department of Physics, Stanford University, Stanford, California 94305, USA.
S
S
Yellin
Department of Physics, Stanford University, Stanford, California 94305, USA.
J J
JJ
Yen
Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA.
J
J
Yoo
Department of Physics, Santa Clara University, Santa Clara, California 95053, USA.
B A
BA
Young
School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
J
J
Zhang