Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of $A_c$ with Charmed Mesons at SLD   We present a direct measurement of the parity-violation parameter $A_c$ in
the coupling of the $Z^0$ to $c$-quarks with the SLD detector. The measurement
is based on a sample of 530k hadronic $Z^0$ decays, produced with a mean
electron-beam polarization of $|P_e| = 73 %$. The tagging of $c$-quark events
is performed using two methods: the exclusive reconstruction of $D^{\ast+}$,
$D^+$, and $D^0$ mesons, and the soft-pions ($\pi_s$) produced in the decay of
$D^{\ast+}\to D^0 \pi_s^+$. The large background from $D$ mesons produced in
$B$ hadron decays is separated efficiently from the signal using precision
vertex information. The combination of these two methods yields $A_c = 0.688
\pm 0.041.$

29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ