Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: CALCULATION OF THE D AND B MESON LIFETIMES AND THE UNITARITY TRIANGLE
  PARAMETERS   Using the expansions of the heavy meson decay widths in the heavy quark mass
and QCD sum rules for estimates of corresponding matrix elements,\, we
calculate the $D^{\pm,o,s}$ and $B^{\pm,o,s}$ meson lifetimes. The results for
D mesons are in a reasonable agreement with the data,\, while it is predicted:
$[\Gamma (B_d)-\Gamma (B^\pm)]/\Gamma_B\se 4\%\,$ (and the lifetime difference
of the $B_d$ and $B_s$ mesons is even smaller);\,
$[\Gamma(B_s^{short})-\Gamma(B_s^{long})]/{\ov \Gamma}(B_s)\se 8\%\,.$ The role
of the weak annihilation and Pauli interference contributions to the lifetime
differences is described in detail. In the course of self-consistent
calculations the values of many parameters crucial for calculations with
charmed and beauty mesons are found. In particular,\, the quark pole masses
are: $M_c\se 1.65\,GeV,\,\, M_b\se 5.04\,GeV\,,$ and the decay constants are:
$f_D(M_c)\se 165\,MeV\,,\,\,f_B(M_b)\se 120\,MeV\,$. It is also shown that the
nonfactorizable corrections to the $B-{\bar B}$ mixing are large,\,
$B_B(M_b)\se (1-18\%)\,.$ The values of the unitarity triangle parameters are
found which are consistent with these results and the data available (except
for the NA31 result for the $\epsilon ^{\prime}/\epsilon$ which is too large):
$|V_{cb}|\se 4.2\cdot 10^{-2}\,,\, |V_{td}|\se 1.3\cdot 10^{-2}\,,\,
|V_{ub}/V_{cb}|\se 0.10\,,\, \{\,A\se 0.86\,,\,\,\rho \se -0.40\,,\,\, \eta \se
0.20\,\}.$

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The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: astro-ph
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The categories of this paper are: funct-an
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The categories of this paper are: cs
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: physics
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The categories of this paper are: math
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The categories of this paper are: acc-phys
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The categories of this paper are: econ
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The categories of this paper are: q-alg
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The categories of this paper are: patt-sol