Search for the rare decay B0-->tau+tau- at BABAR.
We present the results of a search for the decay B0-->tau+tau- in a data sample of (232+/-3)x10(6) Upsilon(4S)-->BB decays using the BABAR detector. Certain extensions of the standard model predict measurable levels of this otherwise rare decay. We reconstruct fully one neutral B meson and seek evidence for the signal decay in the rest of the event. We find no evidence for signal events and obtain Beta(B0->tau+tau-)<4.1x10(-3) at the 90% confidence level.
Aubert
B
B
Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, France.
Barate
R
R
Boutigny
D
D
Couderc
F
F
Karyotakis
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Y
Lees
J P
JP
Poireau
V
V
Tisserand
V
V
Zghiche
A
A
Grauges
E
E
Palano
A
A
Pappagallo
M
M
Pompili
A
A
Chen
J C
JC
Qi
N D
ND
Rong
G
G
Wang
P
P
Zhu
Y S
YS
Eigen
G
G
Ofte
I
I
Stugu
B
B
Abrams
G S
GS
Battaglia
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M
Breon
A B
AB
Brown
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DN
Button-Shafer
J
J
Cahn
R N
RN
Charles
E
E
Day
C T
CT
Gill
M S
MS
Gritsan
A V
AV
Groysman
Y
Y
Jacobsen
R G
RG
Kadel
R W
RW
Kadyk
J
J
Kerth
L T
LT
Kolomensky
Yu G
YG
Kukartsev
G
G
Lynch
G
G
Mir
L M
LM
Oddone
P J
PJ
Orimoto
T J
TJ
Pripstein
M
M
Roe
N A
NA
Ronan
M T
MT
Wenzel
W A
WA
Barrett
M
M
Ford
K E
KE
Harrison
T J
TJ
Hart
A J
AJ
Hawkes
C M
CM
Morgan
S E
SE
Watson
A T
AT
Fritsch
M
M
Goetzen
K
K
Held
T
T
Koch
H
H
Lewandowski
B
B
Pelizaeus
M
M
Peters
K
K
Schroeder
T
T
Steinke
M
M
Boyd
J T
JT
Burke
J P
JP
Chevalier
N
N
Cottingham
W N
WN
Cuhadar-Donszelmann
T
T
Fulsom
B G
BG
Hearty
C
C
Knecht
N S
NS
Mattison
T S
TS
McKenna
J A
JA
Khan
A
A
Kyberd
P
P
Saleem
M
M
Teodorescu
L
L
Blinov
A E
AE
Blinov
V E
VE
Bukin
A D
AD
Druzhinin
V P
VP
Golubev
V B
VB
Kravchenko
E A
EA
Onuchin
A P
AP
Serednyakov
S I
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Skovpen
Yu I
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Solodov
E P
EP
Yushkov
A N
AN
Best
D
D
Bondioli
M
M
Bruinsma
M
M
Chao
M
M
Curry
S
S
Eschrich
I
I
Kirkby
D
D
Lankford
A J
AJ
Lund
P
P
Mandelkern
M
M
Mommsen
R K
RK
Roethel
W
W
Stoker
D P
DP
Buchanan
C
C
Hartfiel
B L
BL
Weinstein
A J R
AJ
Foulkes
S D
SD
Gary
J W
JW
Long
O
O
Shen
B C
BC
Wang
K
K
Zhang
L
L
del Re
D
D
Hadavand
H K
HK
Hill
E J
EJ
MacFarlane
D B
DB
Paar
H P
HP
Rahatlou
S
S
Sharma
V
V
Berryhill
J W
JW
Campagnari
C
C
Cunha
A
A
Dahmes
B
B
Hong
T M
TM
Mazur
M A
MA
Richman
J D
JD
Verkerke
W
W
Beck
T W
TW
Eisner
A M
AM
Flacco
C J
CJ
Heusch
C A
CA
Kroseberg
J
J
Lockman
W S
WS
Nesom
G
G
Schalk
T
T
Schumm
B A
BA
Seiden
A
A
Spradlin
P
P
Williams
D C
DC
Wilson
M G
MG
Albert
J
J
Chen
E
E
Dubois-Felsmann
G P
GP
Dvoretskii
A
A
Hitlin
D G
DG
Narsky
I
I
Piatenko
T
T
Porter
F C
FC
Ryd
A
A
Samuel
A
A
Andreassen
R
R
Mancinelli
G
G
Meadows
B T
BT
Sokoloff
M D
MD
Blanc
F
F
Bloom
P
P
Chen
S
S
Ford
W T
WT
Hirschauer
J F
JF
Kreisel
A
A
Nauenberg
U
U
Olivas
A
A
Rankin
P
P
Ruddick
W O
WO
Smith
J G
JG
Ulmer
K A
KA
Wagner
S R
SR
Zhang
J
J
Chen
A
A
Eckhart
E A
EA
Harton
J L
JL
Soffer
A
A
Toki
W H
WH
Wilson
R J
RJ
Zeng
Q
Q
Aleksan
R
R
Emery
S
S
Gaidot
A
A
Ganzhur
S F
SF
Giraud
P-F
PF
Graziani
G
G
Hamel de Monchenault
G
G
Kozanecki
W
W
Legendre
M
M
London
G W
GW
Mayer
B
B
Vasseur
G
G
Yeche
Ch
Ch
Zito
M
M
Altenburg
D
D
Feltresi
E
E
Hauke
A
A
Spaan
B
B
Brandt
T
T
Brose
J
J
Dickopp
M
M
Klose
V
V
Lacker
H M
HM
Nogowski
R
R
Otto
S
S
Petzold
A
A
Schubert
J
J
Schubert
K R
KR
Schwierz
R
R
Sundermann
J E
JE
Bernard
D
D
Bonneaud
G R
GR
Grenier
P
P
Schrenk
S
S
Thiebaux
Ch
Ch
Vasileiadis
G
G
Verderi
M
M
Bard
D J
DJ
Clark
P J
PJ
Gradl
W
W
Muheim
F
F
Playfer
S
S
Xie
Y
Y
Andreotti
M
M
Azzolini
V
V
Bettoni
D
D
Bozzi
C
C
Calabrese
R
R
Cibinetto
G
G
Luppi
E
E
Negrini
M
M
Piemontese
L
L
Anulli
F
F
Baldini-Ferroli
R
R
Calcaterra
A
A
de Sangro
R
R
Finocchiaro
G
G
Patteri
P
P
Peruzzi
I M
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Piccolo
M
M
Zallo
A
A
Buzzo
A
A
Capra
R
R
Contri
R
R
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M
M
Macri
M
M
Monge
M R
MR
Passaggio
S
S
Patrignani
C
C
Robutti
E
E
Santroni
A
A
Tosi
S
S
Brandenburg
G
G
Chaisanguanthum
K S
KS
Morii
M
M
Won
E
E
Wu
J
J
Dubitzky
R S
RS
Langenegger
U
U
Marks
J
J
Schenk
S
S
Uwer
U
U
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F
F
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W
W
Bowerman
D A
DA
Dauncey
P D
PD
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R L
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J R
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Morton
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J A
JA
Nikolich
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Taylor
G P
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Vazquez
W P
WP
Charles
M J
MJ
Mader
W F
WF
Mallik
U
U
Mohapatra
A K
AK
Cochran
J
J
Crawley
H B
HB
Eyges
V
V
Meyer
W T
WT
Prell
S
S
Rosenberg
E I
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Rubin
A E
AE
Yi
J
J
Biasini
M
M
Covarelli
R
R
Pacetti
S
S
Pioppi
M
M
Arnaud
N
N
Davier
M
M
Giroux
X
X
Grosdidier
G
G
Höcker
A
A
Le Diberder
F
F
Lepeltier
V
V
Lutz
A M
AM
Oyanguren
A
A
Petersen
T C
TC
Pierini
M
M
Plaszczynski
S
S
Rodier
S
S
Roudeau
P
P
Schune
M H
MH
Stocchi
A
A
Wormser
G
G
Cheng
C H
CH
Lange
D J
DJ
Simani
M C
MC
Wright
D M
DM
Bevan
A J
AJ
Chavez
C A
CA
Forster
Ian J
IJ
Fry
J R
JR
Gabathuler
E
E
Gamet
R
R
George
K A
KA
Hutchcroft
D E
DE
Parry
R J
RJ
Payne
D J
DJ
Schofield
K C
KC
Touramanis
C
C
Cormack
C M
CM
Di Lodovico
F
F
Menges
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W
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R
Brown
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CL
Cowan
G
G
Flaecher
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Green
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MG
Hopkins
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Jackson
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PS
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T R
TR
Ricciardi
S
S
Salvatore
F
F
Brown
D
D
Davis
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Allison
J
J
Barlow
N R
NR
Barlow
R J
RJ
Edgar
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CL
Hodgkinson
M C
MC
Kelly
M P
MP
Lafferty
G D
GD
Naisbit
M T
MT
Williams
J C
JC
Chen
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C
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W D
WD
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D
D
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G
G
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G
G
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C
C
Hertzbach
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K
K
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M
Taylor
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Yamamoto
R K
RK
Kim
H
H
Patel
P M
PM
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A
A
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V
V
Palombo
F
F
Bauer
J M
JM
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L
L
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V
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R
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R
R
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J
J
Sanders
D A
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S
S
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D
D
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P
P
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H
H
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M
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H
H
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G
Snoek
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L
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G
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F
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C
C
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L
L
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D
D
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P
P
Piccolo
D
D
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C
C
Jessop
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T
T
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G
G
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KK
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K
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D
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H
Kass
R
R
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R
R
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J
J
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R
R
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O
O
Lu
M
M
Potter
C T
CT
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N B
NB
Strom
D
D
Strube
J
J
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E
E
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F
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M
M
Morandin
M
M
Posocco
M
M
Rotondo
M
M
Simonetto
F
F
Stroili
R
R
Voci
C
C
Benayoun
M
M
Briand
H
H
Chauveau
J
J
David
P
P
de la Vaissiere
C
C
Del Buono
L
L
Hamon
O
O
John
M J J
MJ
Leruste
Ph
P
Malcles
J
J
Ocariz
J
J
Roos
L
L
Therin
G
G
Behera
P K
PK
Gladney
L
L
Guo
Q H
QH
Panetta
J
J
Angelini
C
C
Batignani
G
G
Bettarini
S
S
Bucci
F
F
Calderini
G
G
Carpinelli
M
M
Cenci
R
R
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F
F
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MA
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G
G
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M
M
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N
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M
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G
G
Walsh
J
J
Haire
M
M
Judd
D
D
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Biesiada
J
J
Danielson
N
N
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P
P
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Y
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Smith
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G
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J
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D
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T
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V
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WR
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MH
Kim
P
P
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ML
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J
J
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S
S
Luth
V
V
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H L
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H
H
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R
R
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C P
CP
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VE
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A
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M
M
Ratcliff
B N
BN
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A
A
Salnikov
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AA
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J
Snyder
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J
Su
D
D
Sullivan
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MK
Suzuki
K
K
Swain
S K
SK
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J M
JM
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J
J
van Bakel
N
N
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M
M
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W J
WJ
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M
Wright
D H
DH
Yarritu
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AK
Yi
K
K
Young
C C
CC
Burchat
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PR
Edwards
A J
AJ
Majewski
S A
SA
Petersen
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BA
Roat
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C
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M
Ahmed
S
S
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R
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MA
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S B
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Bugg
W
W
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M
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SM
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R
R
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A
Schwitters
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JM
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S
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M
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F
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D
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M
Bosisio
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L
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G
G
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S
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S
S
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L
Vitale
L
L
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B
Brown
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R
R
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JM
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R J
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JJ
Harrison
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PF
Latham
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TE
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GB
Band
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HR
Chen
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M
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M
M
Hollar
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H
Liu
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R
Tan
P
P
von Wimmersperg-Toeller
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JH
Wu
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Yu
Z
Z
Neal
H
H
Schott
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G