11 research outputs found
Octet baryon magnetic moments in light cone QCD sum rules
Octet baryon magnetic moments are calculated in framework of the light cone
QCD sum rules. The analysis is carried for the general form of the
interpolating currents for octet baryons. A comparison of our results on the
magnetic moments of octet baryons with the predictions of other approaches and
experimental data is presented.Comment: 20 pages, 10 figures, 1 Table, LaTeX formatte
Fourth generation effects in processes induced by "b -> s" transition
We study the effects of sequential fourth quark generation in rare "B ->
K(K*) l^+ l^-" decays induced by "b -> s" transition and in "B_s^0 -
bar{B}_s^0" mixing. Using the experimental values on branching ratios of the "B
-> X_s gamma" and "B -> K(K*) l^+ l^-" decays, the allowed regions for \vel
V_{tb} V_{ts}^\ast\ver and "|V_{t'b} V_{t's}*| are determined as a function of
the (t') quark mass.Comment: 18 pages, 8 figures, LaTeX formatte
Radiative (phi -> f_0(980) gamma) decay in light cone QCD sum rules
The light cone QCD sum rules method is used to calculate the transition form
factor for the radiative (phi -> f_0 gamma) decay, assuming that the quark
content of the (f_0) meson is pure (bar{s}s) state. The branching ratio is
estimated to be Br(phi -> f_0 gamma) = 3.5 x (1 pm 0.3) x 10^(-4). A comparison
of our prediction on branching ratio with the theoretical results and
experimental data existing in literature is presented.Comment: 8 pp, 1 figure (postscript formatted), LaTex formatte
Excited Heavy Mesons Decay Formfactors in Light Cone QCD
The formfactors of B_1 -> pi and D_1 -> pi transitions, where B_1(D_1) is the
1^+ P-wave -> Q gamma_{\nu}\gamma_5q meson state, are calculated in the
framework of the light cone QCD. Furthermore these formfactors are compared
with the pole dominance model prediction using the values of the strong
coupling constants g_{B_1 B^* pi} and g_{D_1 D^* pi}, and a good agreement
between these two different descriptions is observed.Comment: 14 pages, 2 figures, LaTeX formatted. METU-PHYS-HEP-96-2
New physics effects in (Lambda_b -> Lambda l^+ l^-) decay with lepton polarizations
We study lepton polarization asymmetries in the (Lambda_b -> Lambda l^+ l^-)
decay using the most general model independent effective Hamiltonian. The
dependence of the lepton polarizations and their combinations on the new Wilson
coefficients are studied in detail. It is observed that there is a region for
the new Wilson coefficients for which the branching ratio coincides with the
standard model prediction, while lepton polarizations show considerable
departure from standard model.Comment: 18 pages, 11 figures, LaTeX formatte
Nucleon Electromagnetic Form Factors in QCD
The nucleon electromagnetic form factors are calculated in light cone QCD sum
rules framework using the most general form of the nucleon interpolating
current. Using two forms of the distribution amplitudes (DA's), predictions for
the form factors are presented and compared with existing experimental data. It
is shown that our results describe remarkably well the existing experimental
data.Comment: 21 pages, 7 figure
Light vector meson octet-decuplet baryon vertices in QCD
The strong coupling constants between light vector mesons and octet-decuplet
baryons are calculated in framework of the light cone QCD sum rules, taking
into account SU(3) flavor symmetry breaking effects. It is shown that all
strong coupling constants can be represented in terms of a single universal
function. Size of the SU(3) symmetry breaking effects are estimated.Comment: 27 pages, 6 figures, LaTeX formatte
Vector meson-baryon strong coupling contants in light cone QCD sum rules
Using the most general form of the interpolating current of the baryons, the
strong coupling constants of the light vector mesons with the octet baryons are
calculated within the light cone QCD sum rules. The SU(3)_f symmetry breaking
effects are taken into account in the calculations. It is shown that each of
the electric and magnetic coupling constants can be described in terms of three
universal functions. A detailed comparison of the results of this work on
aforementioned couplings with the existing theoretical results is presented.Comment: 25 pages, 4 figures, LaTeX formatte