Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Reanalysis of the Four-Quark Operators Relevant to \Lambda_b Lifetime
  from QCD Sum Rule   \Lambda_b matrix element of four-quark operator relevant to its lifetime is
reanalyzed by QCD sum rule. The new ingredients introduced are that (1) more
vacuum condensates are considered; (2) different quark-hadron duality is
adopted; and (3) the possible deviation from the vacuum saturation assumption
for the four quark condensates is considered. With \kappa_1=4 the related
hadronic parameter r is calculated to be 3.6 \pm 0.9, and the lifetime ratio
\tau(\Lambda_b)/\tau(B^0) = 0.83 \pm 0.04, which is consistent with the
experimental data.

5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys