Measurement of atmospheric neutrino flux consistent with tau neutrino appearance.
A search for the appearance of tau neutrinos from nu(mu) <--> nu(tau) oscillations in the atmospheric neutrinos has been performed using 1489.2 days of atmospheric neutrino data from the Super-Kamiokande-I experiment. A best fit tau neutrino appearance signal of 138+/-48(stat)-32(+15)(syst) events is obtained with an expectation of 78+/-26(syst). The hypothesis of no tau neutrino appearance is disfavored by 2.4 sigma.
Abe
K
K
Kamioka Observatory, Institute for Cosmic Ray Research, University of Tokyo, Kamioka, Gifu 506-1205, Japan.
Hayato
Y
Y
Iida
T
T
Ishihara
K
K
Kameda
J
J
Koshio
Y
Y
Minamino
A
A
Mitsuda
C
C
Miura
M
M
Moriyama
S
S
Nakahata
M
M
Obayashi
Y
Y
Ogawa
H
H
Shiozawa
M
M
Suzuki
Y
Y
Takeda
A
A
Takeuchi
Y
Y
Ueshima
K
K
Higuchi
I
I
Ishihara
C
C
Ishitsuka
M
M
Kajita
T
T
Kaneyuki
K
K
Mitsuka
G
G
Nakayama
S
S
Nishino
H
H
Okumura
K
K
Saji
C
C
Takenaga
Y
Y
Totsuka
Y
Y
Clark
S
S
Desai
S
S
Dufour
F
F
Kearns
E
E
Likhoded
S
S
Litos
M
M
Raaf
J L
JL
Stone
J L
JL
Sulak
L R
LR
Wang
W
W
Goldhaber
M
M
Casper
D
D
Cravens
J P
JP
Kropp
W R
WR
Liu
D W
DW
Mine
S
S
Regis
C
C
Smy
M B
MB
Sobel
H W
HW
Vagins
M R
MR
Ganezer
K S
KS
Hill
J E
JE
Keig
W E
WE
Jang
J S
JS
Kim
J Y
JY
Lim
I T
IT
Scholberg
K
K
Tanimoto
N
N
Walter
C W
CW
Wendell
R
R
Ellsworth
R W
RW
Tasaka
S
S
Guillian
E
E
Learned
J G
JG
Matsuno
S
S
Messier
M D
MD
Ichikawa
A K
AK
Ishida
T
T
Ishii
T
T
Iwashita
T
T
Kobayashi
T
T
Nakadaira
T
T
Nakamura
K
K
Nitta
K
K
Oyama
Y
Y
Suzuki
A T
AT
Hasegawa
M
M
Kato
I
I
Maesaka
H
H
Nakaya
T
T
Nishikawa
K
K
Sasaki
T
T
Sato
H
H
Yamamoto
S
S
Yokoyama
M
M
Haines
T J
TJ
Dazeley
S
S
Hatakeyama
S
S
Svoboda
R
R
Sullivan
G W
GW
Habig
A
A
Gran
R
R
Fukuda
Y
Y
Sato
T
T
Itow
Y
Y
Koike
T
T
Jung
C K
CK
Kato
T
T
Kobayashi
K
K
Malek
M
M
McGrew
C
C
Sarrat
A
A
Terri
R
R
Yanagisawa
C
C
Tamura
N
N
Sakuda
M
M
Sugihara
M
M
Kuno
Y
Y
Yoshida
M
M
Kim
S B
SB
Yoo
J
J
Ishizuka
T
T
Okazawa
H
H
Choi
Y
Y
Seo
H K
HK
Gando
Y
Y
Hasegawa
T
T
Inoue
K
K
Ishii
H
H
Nishijima
K
K
Ishino
H
H
Watanabe
Y
Y
Koshiba
M
M
Kielczewska
D
D
Zalipska
J
J
Berns
H G
HG
Shiraishi
K K
KK
Washburn
K
K
Wilkes
R J
RJ