First direct measurement of the parity-violating coupling of the Z0 to the s quark
We present the first direct measurement of A(s), the parity-violating coupling of the Z0 boson to the strange quark, using approximately 550 000 e(+)e(-)-->Z0-->hadrons events recorded by the SLC Large Detector with a polarized e(-) beam. We tagged Z0-->s&smacr; events by the absence of B or D hadrons and the presence in each hemisphere of a high momentum K+/- or K(0)(s). Fitting the polar angle distributions of the strangeness-signed thrust axis gave A(s) = 0.895+/-0.066(stat)+/-0.062(syst). The analyzing power and uu+d&dmacr; background were constrained using the data, greatly reducing any model dependence.
Saxton
OH
Tohoku University, Sendai, 980 Japan.
Schalk
T
Schumm
BA
Schwiening
J
Serbo
VV
Shapiro
G
Sinev
NB
Snyder
JA
Staengle
H
Stahl
A
Stamer
P
Steiner
H
Su
D
Suekane
F
Sugiyama
A
Suzuki
A
Swartz
M
Taylor
FE
Thom
J
Torrence
E
Usher
T
Va'vra
J
Verdier
R
Wagner
DL
Waite
AP
Walston
S