6,162 research outputs found
B to tensor meson form factors in the perturbative QCD approach
We calculate the form factors within the framework of the
perturbative QCD approach, where denotes a light tensor meson with
. Due to the similarities between the wave functions of a vector and a
tensor meson, the factorization formulas of form factors can be
obtained from the transition through a replacement rule. As a
consequence, we find that these two sets of form factors have the same signs
and correlated -dependence behaviors. At point, the form
factors are smaller than the ones, in accordance with the experimental
data of radiative B decays. In addition, we use our results for the form
factors to explore semilteptonic decays and the branching
fractions can reach the order .Comment: 13 pages, 3 figures, 6 tables, published versio
The Strong g_B(**)BPi Coupling Constant in full QCD
To leading order in alpha_s, the leading and non-leading 1/m_b corrections to
the excited g_B^(**) meson coupling g_B^(**)BPi is calculated in the framework
of QCD spectral moment sum rules in the full theory. Our prediction is in good
agreement=20 with the light-cone QCD sum rule result.Comment: 7 pages,LaTeX formatte
The masses and residues of doubly heavy spin--3/2 baryons
The masses and residues of the spin--3/2 doubly heavy baryons are calculated
within the QCD sum rules method. A comparison of our predictions with those
existing in the literature is also made.Comment: 11 Pages and 4 Table
Magnetic moments of baryons in QCD
The magnetic moments of the low lying, negative parity, spin-3/2 baryons are
calculated within the light cone QCD sum rules method. The contributions coming
from the positive parity, spin-3/2 baryons, as well as from the positive and
negative parity spin-1/2 baryons are eliminated by constructing combinations of
various invariant amplitudes corresponding to the coefficients of the different
Lorentz structures.Comment: 12 pages, 1 figure, LaTeX formatte
Penguin induced (B -> eta) transition form factor in light cone QCD
We calculate the penguin form factor for the (B -> eta l^+ l^-) decay. This
form factor is calculated in light cone QCD sum rules, including contributions
from wave functions up to twist-4, as well as mass corrections of the light
(eta) meson.Comment: 9 pages, 2 figures, LaTeX formatte
Octet negative parity to octet positive parity electromagnetic transitions in light cone QCD
Light cone QCD sum rules for the electromagnetic transition form factors
among positive and negative parity octet baryons are derived. The unwanted
contributions of the diagonal transitions among positive parity octet baryons
are eliminated by combining the sum rules derived from different Lorentz
structures. The dependence for the transversal and longitudinal helicity
amplitudes are studied.Comment: 27 pages, 10 figures, LaTeX formatte
Magnetic moments of negative-parity baryons in QCD
Using the most general form of the interpolating current for the octet
baryons, the magnetic moments of the negative-parity baryons are calculated
within the light-cone sum rules. The contributions coming from diagonal
transitions of the positive-parity baryons, and also from non-diagonal
transition between positive and negative-parity baryons are eliminated by
considering the combinations of different sum rules corresponding to the
different Lorentz structures. A comparison of our results on magnetic moments
of the negative-parity baryons with the other approaches existing in literature
is presented.Comment: 23 pages, No figures, LaTeX formatte
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