Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mixing of B mesons and Decay Constants with the Non-Perturbatively
  Improved Action   Several quantities relevant to phenomenological studies of the mixing of
neutral B mesons are computed on the lattice. Our main results are: f_{Bd}
sqrt(B_{Bd})=206(28)(7) MeV, f_{Bs} sqrt(B_{Bs})/f_{Bd}sqrt(B_{Bd})=1.16(7). We
also obtain the related quantities f_{Bs}sqrt(B{Bs})=237(18)(8) MeV, f_{Bd}=
174(22)(+7-0)(-4-0) MeV, f_{Bs}= 204(15)(+7-0)(+3-0) MeV,
f_{Bs}/f_{Bd}=1.17(4)(+0-1), f_{Bd}/f_{Ds}=0.74(5). After combining our results
with the experimental world average (Delta m_d), we predict (Delta
m_s)=15.8(2.1)(3.3) ps^{-1}. We have also computed the relevant parameters for
mixing of neutral D mesons which may be useful in some extensions of the
Standard Model. All the quantities were obtained from a quenched simulation
with a non-perturbatively improved Clover action at beta=6.2, corresponding to
a lattice spacing 1/a=2.7(1) GeV, on a sample of 200 gauge-field
configurations. A discussion of the main systematic errors is also presented.

22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin