Observation of CP violation in B(0) --> K(+)pi(-) and B(0) --> pi(+)pi(-).
We report observations of CP violation in the decays B(0) --> K(+)pi(-) and B(0) --> pi(+)pi(-) in a sample of 383 x 10(6) Upsilon(4S) --> BB[over] events. We find 4372+/-82 B(0) --> K(+)pi(-) decays and measure the direct CP-violating charge asymmetry A(Kpi) = -0.107+/-0.018(stat)(-0.004)(+0.007)(syst), which excludes the CP-conserving hypothesis with a significance of 5.5 standard deviations. In the same sample, we find 1139+/-49 B(0) --> pi(+)pi(-) decays and measure the CP-violating asymmetries S(pipi) = -0.60+/-0.11(stat)+/-0.03(syst) and C(pipi) = -0.21+/-0.09(stat)+/-0.02(syst). CP conservation in B(0) --> pi(+)pi(-) (S(pipi) = C(pipi) = 0) is excluded at a confidence level 1-C.L. = 8 x 10(-8), corresponding to 5.4 standard deviations.
Laboratoire de Physique des Particules, IN2P3/CNRS et Université de Savoie, F-74941 Annecy-Le-Vieux, France.
B
B
Aubert
M
M
Bona
D
D
Boutigny
Y
Y
Karyotakis
J P
JP
Lees
V
V
Poireau
X
X
Prudent
V
V
Tisserand
A
A
Zghiche
J
J
Garra Tico
E
E
Grauges
L
L
Lopez
A
A
Palano
G
G
Eigen
I
I
Ofte
B
B
Stugu
L
L
Sun
G S
GS
Abrams
M
M
Battaglia
D N
DN
Brown
J
J
Button-Shafer
R N
RN
Cahn
Y
Y
Groysman
R G
RG
Jacobsen
J A
JA
Kadyk
L T
LT
Kerth
Yu G
YG
Kolomensky
G
G
Kukartsev
D
D
Lopes Pegna
G
G
Lynch
L M
LM
Mir
T J
TJ
Orimoto
M
M
Pripstein
N A
NA
Roe
M T
MT
Ronan
K
K
Tackmann
W A
WA
Wenzel
P
P
Del Amo Sanchez
C M
CM
Hawkes
A T
AT
Watson
T
T
Held
H
H
Koch
B
B
Lewandowski
M
M
Pelizaeus
T
T
Schroeder
M
M
Steinke
W N
WN
Cottingham
D
D
Walker
D J
DJ
Asgeirsson
T
T
Cuhadar-Donszelmann
B G
BG
Fulsom
C
C
Hearty
N S
NS
Knecht
T S
TS
Mattison
J A
JA
McKenna
A
A
Khan
M
M
Saleem
L
L
Teodorescu
V E
VE
Blinov
A D
AD
Bukin
V P
VP
Druzhinin
V B
VB
Golubev
A P
AP
Onuchin
S I
SI
Serednyakov
Yu I
YI
Skovpen
E P
EP
Solodov
K Yu
KY
Todyshev
M
M
Bondioli
S
S
Curry
I
I
Eschrich
D
D
Kirkby
A J
AJ
Lankford
P
P
Lund
M
M
Mandelkern
E C
EC
Martin
D P
DP
Stoker
S
S
Abachi
C
C
Buchanan
S D
SD
Foulkes
J W
JW
Gary
F
F
Liu
O
O
Long
B C
BC
Shen
L
L
Zhang
H P
HP
Paar
S
S
Rahatlou
V
V
Sharma
J W
JW
Berryhill
C
C
Campagnari
A
A
Cunha
B
B
Dahmes
T M
TM
Hong
D
D
Kovalskyi
J D
JD
Richman
T W
TW
Beck
A M
AM
Eisner
C J
CJ
Flacco
C A
CA
Heusch
J
J
Kroseberg
W S
WS
Lockman
T
T
Schalk
B A
BA
Schumm
A
A
Seiden
D C
DC
Williams
M G
MG
Wilson
L O
LO
Winstrom
E
E
Chen
C H
CH
Cheng
A
A
Dvoretskii
F
F
Fang
D G
DG
Hitlin
I
I
Narsky
T
T
Piatenko
F C
FC
Porter
G
G
Mancinelli
B T
BT
Meadows
K
K
Mishra
M D
MD
Sokoloff
F
F
Blanc
P C
PC
Bloom
S
S
Chen
W T
WT
Ford
J F
JF
Hirschauer
A
A
Kreisel
M
M
Nagel
U
U
Nauenberg
A
A
Olivas
J G
JG
Smith
K A
KA
Ulmer
S R
SR
Wagner
J
J
Zhang
A M
AM
Gabareen
A
A
Soffer
W H
WH
Toki
R J
RJ
Wilson
F
F
Winklmeier
Q
Q
Zeng
D D
DD
Altenburg
E
E
Feltresi
A
A
Hauke
H
H
Jasper
J
J
Merkel
A
A
Petzold
B
B
Spaan
K
K
Wacker
T
T
Brandt
V
V
Klose
H M
HM
Lacker
W F
WF
Mader
R
R
Nogowski
J
J
Schubert
K R
KR
Schubert
R
R
Schwierz
J E
JE
Sundermann
A
A
Volk
D
D
Bernard
G R
GR
Bonneaud
E
E
Latour
V
V
Lombardo
Ch
Ch
Thiebaux
M
M
Verderi
P J
PJ
Clark
W
W
Gradl
F
F
Muheim
S
S
Playfer
A I
AI
Robertson
Y
Y
Xie
M
M
Andreotti
D
D
Bettoni
C
C
Bozzi
R
R
Calabrese
A
A
Cecchi
G
G
Cibinetto
P
P
Franchini
E
E
Luppi
M
M
Negrini
A
A
Petrella
L
L
Piemontese
E
E
Prencipe
V
V
Santoro
F
F
Anulli
R
R
Baldini-Ferroli
A
A
Calcaterra
R
R
de Sangro
G
G
Finocchiaro
S
S
Pacetti
P
P
Patteri
I M
IM
Peruzzi
M
M
Piccolo
M
M
Rama
A
A
Zallo
A
A
Buzzo
R
R
Contri
M
M
Lo Vetere
M M
MM
Macri
M R
MR
Monge
S
S
Passaggio
C
C
Patrignani
E
E
Robutti
A
A
Santroni
S
S
Tosi
K S
KS
Chaisanguanthum
M
M
Morii
J
J
Wu
R S
RS
Dubitzky
J
J
Marks
S
S
Schenk
U
U
Uwer
D J
DJ
Bard
P D
PD
Dauncey
R L
RL
Flack
J A
JA
Nash
M B
MB
Nikolich
W
W
Panduro Vazquez
P K
PK
Behera
X
X
Chai
M J
MJ
Charles
U
U
Mallik
N T
NT
Meyer
V
V
Ziegler
J
J
Cochran
H B
HB
Crawley
L
L
Dong
V
V
Eyges
W T
WT
Meyer
S
S
Prell
E I
EI
Rosenberg
A E
AE
Rubin
A V
AV
Gritsan
Z J
ZJ
Guo
C K
CK
Lae
A G
AG
Denig
M
M
Fritsch
G
G
Schott
N
N
Arnaud
J
J
Béquilleux
M
M
Davier
G
G
Grosdidier
A
A
Höcker
V
V
Lepeltier
F
F
Le Diberder
A M
AM
Lutz
S
S
Pruvot
S
S
Rodier
P
P
Roudeau
M H
MH
Schune
J
J
Serrano
V
V
Sordini
A
A
Stocchi
W F
WF
Wang
G
G
Wormser
D J
DJ
Lange
D M
DM
Wright
C A
CA
Chavez
I J
IJ
Forster
J R
JR
Fry
E
E
Gabathuler
R
R
Gamet
D E
DE
Hutchcroft
D J
DJ
Payne
K C
KC
Schofield
C
C
Touramanis
A J
AJ
Bevan
K A
KA
George
F
F
Di Lodovico
W
W
Menges
R
R
Sacco
G
G
Cowan
H U
HU
Flaecher
D A
DA
Hopkins
P S
PS
Jackson
T R
TR
McMahon
F
F
Salvatore
A C
AC
Wren
D N
DN
Brown
C L
CL
Davis
J
J
Allison
N R
NR
Barlow
R J
RJ
Barlow
Y M
YM
Chia
C L
CL
Edgar
G D
GD
Lafferty
T J
TJ
West
J I
JI
Yi
J
J
Anderson
C
C
Chen
A
A
Jawahery
D A
DA
Roberts
G
G
Simi
J M
JM
Tuggle
G
G
Blaylock
C
C
Dallapiccola
S S
SS
Hertzbach
X
X
Li
T B
TB
Moore
E
E
Salvati
S
S
Saremi
R
R
Cowan
P H
PH
Fisher
G
G
Sciolla
S J
SJ
Sekula
M
M
Spitznagel
F
F
Taylor
R K
RK
Yamamoto
S E
SE
McLachlin
P M
PM
Patel
S H
SH
Robertson
A
A
Lazzaro
F
F
Palombo
J M
JM
Bauer
L
L
Cremaldi
V
V
Eschenburg
R
R
Godang
R
R
Kroeger
D A
DA
Sanders
D J
DJ
Summers
H W
HW
Zhao
S
S
Brunet
D
D
Côté
M
M
Simard
P
P
Taras
F B
FB
Viaud
H
H
Nicholson
G
G
De Nardo
F
F
Fabozzi
L
L
Lista
D
D
Monorchio
C
C
Sciacca
M A
MA
Baak
G
G
Raven
H L
HL
Snoek
C P
CP
Jessop
J M
JM
Losecco
G
G
Benelli
L A
LA
Corwin
K K
KK
Gan
K
K
Honscheid
D
D
Hufnagel
H
H
Kagan
R
R
Kass
J P
JP
Morris
A M
AM
Rahimi
J J
JJ
Regensburger
R
R
Ter-Antonyan
Q K
QK
Wong
N L
NL
Blount
J
J
Brau
R
R
Frey
O
O
Igonkina
J A
JA
Kolb
M
M
Lu
R
R
Rahmat
N B
NB
Sinev
D
D
Strom
J
J
Strube
E
E
Torrence
N
N
Gagliardi
A
A
Gaz
M
M
Margoni
M
M
Morandin
A
A
Pompili
M
M
Posocco
M
M
Rotondo
F
F
Simonetto
R
R
Stroili
C
C
Voci
E
E
Ben-Haim
H
H
Briand
J
J
Chauveau
P
P
David
L
L
Del Buono
Ch
Ch
de la Vaissière
O
O
Hamon
B L
BL
Hartfiel
Ph
P
Leruste
J
J
Malclès
J
J
Ocariz
A
A
Perez
L
L
Gladney
M
M
Biasini
R
R
Covarelli
E
E
Manoni
C
C
Angelini
G
G
Batignani
S
S
Bettarini
G
G
Calderini
M
M
Carpinelli
R
R
Cenci
A
A
Cervelli
F
F
Forti
M A
MA
Giorgi
A
A
Lusiani
G
G
Marchiori
M A
MA
Mazur
M
M
Morganti
N
N
Neri
E
E
Paoloni
G
G
Rizzo
J J
JJ
Walsh
M
M
Haire
J
J
Biesiada
P
P
Elmer
Y P
YP
Lau
C
C
Lu
J
J
Olsen
A J S
AJ
Smith
A V
AV
Telnov
E
E
Baracchini
F
F
Bellini
G
G
Cavoto
A
A
D'Orazio
D
D
Del Re
E
E
Di Marco
R
R
Faccini
F
F
Ferrarotto
F
F
Ferroni
M
M
Gaspero
P D
PD
Jackson
L
L
Li Gioi
M A
MA
Mazzoni
S
S
Morganti
G
G
Piredda
F
F
Polci
F
F
Renga
C
C
Voena
M
M
Ebert
H
H
Schröder
R
R
Waldi
T
T
Adye
G
G
Castelli
B
B
Franek
E O
EO
Olaiya
S
S
Ricciardi
W
W
Roethel
F F
FF
Wilson
R
R
Aleksan
S
S
Emery
M
M
Escalier
A
A
Gaidot
S F
SF
Ganzhur
G
G
Hamel de Monchenault
W
W
Kozanecki
M
M
Legendre
G
G
Vasseur
Ch
Ch
Yèche
M
M
Zito
X R
XR
Chen
H
H
Liu
W
W
Park
M V
MV
Purohit
J R
JR
Wilson
M T
MT
Allen
D
D
Aston
R
R
Bartoldus
P
P
Bechtle
N
N
Berger
R
R
Claus
J P
JP
Coleman
M R
MR
Convery
J C
JC
Dingfelder
J
J
Dorfan
G P
GP
Dubois-Felsmann
D
D
Dujmic
W
W
Dunwoodie
R C
RC
Field
T
T
Glanzman
S J
SJ
Gowdy
M T
MT
Graham
P
P
Grenier
C
C
Hast
T
T
Hryn'ova
W R
WR
Innes
M H
MH
Kelsey
H
H
Kim
P
P
Kim
D W G S
DW
Leith
S
S
Li
S
S
Luitz
V
V
Luth
H L
HL
Lynch
D B
DB
Macfarlane
H
H
Marsiske
R
R
Messner
D R
DR
Muller
C P
CP
O'grady
A
A
Perazzo
M
M
Perl
T
T
Pulliam
B N
BN
Ratcliff
A
A
Roodman
A A
AA
Salnikov
R H
RH
Schindler
J
J
Schwiening
A
A
Snyder
J
J
Stelzer
D
D
Su
M K
MK
Sullivan
K
K
Suzuki
S K
SK
Swain
J M
JM
Thompson
J
J
Va'vra
N
N
van Bakel
A P
AP
Wagner
M
M
Weaver
W J
WJ
Wisniewski
M
M
Wittgen
D H
DH
Wright
A K
AK
Yarritu
K
K
Yi
C C
CC
Young
P R
PR
Burchat
A J
AJ
Edwards
S A
SA
Majewski
B A
BA
Petersen
L
L
Wilden
S
S
Ahmed
M S
MS
Alam
R
R
Bula
J A
JA
Ernst
V
V
Jain
B
B
Pan
M A
MA
Saeed
F R
FR
Wappler
S B
SB
Zain
W
W
Bugg
M
M
Krishnamurthy
S M
SM
Spanier
R
R
Eckmann
J L
JL
Ritchie
A M
AM
Ruland
C J
CJ
Schilling
R F
RF
Schwitters
J M
JM
Izen
X C
XC
Lou
S
S
Ye
F
F
Bianchi
F
F
Gallo
D
D
Gamba
M
M
Pelliccioni
M
M
Bomben
L
L
Bosisio
C
C
Cartaro
F
F
Cossutti
G
G
Della Ricca
L
L
Lanceri
L
L
Vitale
V
V
Azzolini
N
N
Lopez-March
F
F
Martinez-Vidal
D A
DA
Milanes
A
A
Oyanguren
J
J
Albert
Sw
S
Banerjee
B
B
Bhuyan
K
K
Hamano
R
R
Kowalewski
I M
IM
Nugent
J M
JM
Roney
R J
RJ
Sobie
J J
JJ
Back
P F
PF
Harrison
T E
TE
Latham
G B
GB
Mohanty
M
M
Pappagallo
H R
HR
Band
X
X
Chen
S
S
Dasu
K T
KT
Flood
J J
JJ
Hollar
P E
PE
Kutter
Y
Y
Pan
M
M
Pierini
R
R
Prepost
S L
SL
Wu
Z
Z
Yu
H
H
Neal