Improved direct measurement of leptonic coupling asymmetries with polarized Z bosons.
We present final measurements of the Z boson-lepton coupling asymmetry parameters A(e), A(mu), and A(tau) with the complete sample of polarized Z bosons collected by the SLD detector at the SLAC Linear Collider. From the left-right production and decay polar angle asymmetries in leptonic Z decays we measure A(e) = 0.1544+/-0.0060, A(mu) = 0.142+/-0.015, and A(tau) = 0.136+/-0.015. Combined with our left-right asymmetry measured from hadronic decays, we find A(e) = 0.1516+/-0.0021. Assuming lepton universality, we obtain a combined effective weak mixing angle of sin (2)theta(eff)(W) = 0.230 98+/-0.000 26.
Abe
K
K
Amori University, Aomori, 030 Japan.
Abe
K
K
Abe
T
T
Adam
I
I
Akimoto
H
H
Aston
D
D
Baird
K G
KG
Baltay
C
C
Band
H R
HR
Barklow
T L
TL
Bauer
J M
JM
Bellodi
G
G
Berger
R
R
Blaylock
G
G
Bogart
J R
JR
Bower
G R
GR
Brau
J E
JE
Breidenbach
M
M
Bugg
W M
WM
Burke
D
D
Burnett
T H
TH
Burrows
P N
PN
Calcaterra
A
A
Cassell
R
R
Chou
A
A
Cohn
H O
HO
Coller
J A
JA
Convery
M R
MR
Cook
V
V
Cowan
R F
RF
Crawford
G
G
Damerell
C J
CJ
Daoudi
M
M
de Groot
N
N
de Sangro
R
R
Dong
D N
DN
Doser
M
M
Dubois
R
R
Erofeeva
I
I
Eschenburg
V
V
Etzion
E
E
Fahey
S
S
Falciai
D
D
Fernandez
J P
JP
Flood
K
K
Frey
R
R
Hart
E L
EL
Hasuko
K
K
Hertzbach
S S
SS
Huffer
M E
ME
Huynh
X
X
Iwasaki
M
M
Jackson
D J
DJ
Jacques
P
P
Jaros
J A
JA
Jiang
Z Y
ZY
Johnson
A S
AS
Johnson
J R
JR
Kajikawa
R
R
Kalelkar
M
M
Kang
H J
HJ
Kofler
R R
RR
Kroeger
R S
RS
Langston
M
M
Leith
D W
DW
Lia
V
V
Lin
C
C
Mancinelli
G
G
Manly
S
S
Mantovani
G
G
Markiewicz
T W
TW
Maruyama
T
T
McKemey
A K
AK
Messner
R
R
Moffeit
K C
KC
Moore
T B
TB
Morii
M
M
Muller
D
D
Murzin
V
V
Narita
S
S
Nauenberg
U
U
Neal
H
H
Nesom
G
G
Oishi
N
N
Onoprienko
D
D
Osborne
L S
LS
Panvini
R S
RS
Park
C H
CH
Peruzzi
I
I
Piccolo
M
M
Piemontese
L
L
Plano
R J
RJ
Prepost
R
R
Prescott
C Y
CY
Ratcliff
B N
BN
Reidy
J
J
Reinertsen
P L
PL
Rochester
L S
LS
Rowson
P C
PC
Russell
J J
JJ
Saxton
O H
OH
Schalk
T
T
Schumm
B A
BA
Schwiening
J
J
Serbo
V V
VV
Shapiro
G
G
Sinev
N B
NB
Snyder
J A
JA
Staengle
H
H
Stahl
A
A
Stamer
P
P
Steiner
H
H
Su
D
D
Suekane
F
F
Sugiyama
A
A
Suzuki
S
S
Swartz
M
M
Taylor
F E
FE
Thom
J
J
Torrence
E
E
Usher
T
T
Va'vra
J
J
Verdier
R
R
Wagner
D L
DL
Waite
A P
AP
Walston
S
S
Weidemann
A W
AW
Weiss
E R
ER
Whitaker
J S
JS
Williams
S H
SH
Willocq
S
S
Wilson
R J
RJ
Wisniewski
W J
WJ
Wittlin
J L
JL
Woods
M
M
Wright
T R
TR
Yamamoto
R K
RK
Yashima
J
J
Yellin
S J
SJ
Young
C C
CC
Yuta
H
H