Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Search for D to phi l nu and measurement of the branching fraction for D
  to phi pi   Using a data sample of integrated luminosity of about 33 pb$^{-1}$ collected
around 3.773 GeV with the BESII detector at the BEPC collider, the semileptonic
decays $D^+ \to \phi e ^+\nu_e$, $D^+ \to \phi \mu^+\nu_\mu$ and the hadronic
decay $D^+ \to \phi \pi^+$ are studied. The upper limits of the branching
fractions are set to be $BF(D^+ \to \phi e ^+\nu_e) <$ 2.01% and $BF(D^+ \to
\phi \mu^+ \nu_\mu) <$ 2.04% at the 90% confidence level. The ratio of the
branching fractions for $D^+ \to \phi \pi^+$ relative to $D^+ \to
K^-\pi^+\pi^+$ is measured to be $0.057 \pm 0.011 \pm 0.003$. In addition, the
branching fraction for $D^+ \to \phi \pi^+$ is obtained to be $(5.2 \pm 1.0 \pm
0.4) \times 10^{-3}$.

16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
10
The categories of this paper are: q-bio