533 research outputs found
Improved Fixed Center Approximation of the Faddeev equations for the system with S=0
We extend the Fixed Center Approximation (FCA) to the Faddeev Equations for
the system with S=0, including the charge exchange mechanisms in
the rescattering which have been ignored in former works within the
FCA. We obtain similar results to those found before, but the binding is
reduced by 6 MeV. At the same time we also evaluate the explicit contribution
the intermediate state in the three body system and find that it
produces and additional small decrease in the binding of about 3 MeV. The
system appears bound by about 35 MeV and the width omitting two body
absorption, is about 50 MeV.Comment: 12 pages, 6 figures. arXiv admin note: substantial text overlap with
arXiv:1102.285
Semileptonic transitions in QCD
The form factors relevant to
decays are calculated in the framework of the three point QCD sum
rules approach. The heavy quark effective theory prediction of the form factors
are obtained. The total decay width and branching ratio for these decays are
also evaluated using the dependencies of these form factors.Comment: 4 pages, 4 figures and 3 tables. To be published in the proceedings
of the 14th International QCD Conference (QCD 08), Montpellier, France, 7-12
July 200
Double-Lepton Polarization Asymmetries and Polarized Forward Backward Asymmetries in the Rare b \to s \ell^+ \ell^- Decays in a Single Universal Extra Dimension Scenario
We study the double-lepton polarization asymmetries and single and
double-lepton polarization forward backward asymmetries of the rare b \to s
\ell^+ \ell^- mode within the Standard Model and in the
Appelquist-Cheng-Dobrescu model, which is a new physics scenario with a single
universal extra dimension. In particular, we examine the sensitivity of the
observables to the radius R of the compactified extra-dimension, which is the
new parameter in this new physics model.Comment: 20 Pages, 15 Figures and 1 Tabl
Semileptonic Decays in QCD Sum Rules
The form factors relevant to
decays are calculated in the framework of the three point QCD sum
rules approach. The heavy quark effective theory prediction of the form factors
as well as corrections to those form factors are obtained. A
comparison of the results for the ratio of form factors at zero recoil limit
and other values of with the predictions of the subleading Isgur-Wise
form factor application for is presented. The total
decay width and branching ratio for these decays are also evaluated using the
dependencies of these form factors. The results are in good agreement
with the constituent quark meson model and existing experimental data. The
case can also be detected at LHC in the near future.Comment: 28 Pages, 6 Figures and 9 Table
Flavor Changing Neutral Currents Transition of the to Nucleon in Full QCD and Heavy Quark Effective Theory
The loop level flavor changing neutral currents transitions of the
and are investigated in full
QCD and heavy quark effective theory in the light cone QCD sum rules approach.
Using the most general form of the interpolating current for ,
or , as members of the recently discovered sextet heavy baryons with
spin 1/2 and containing one heavy quark, the transition form factors are
calculated using two sets of input parameters entering the nucleon distribution
amplitudes, namely, QCD sum rules and lattice QCD inputs. The obtained results
are used to estimate the decay rates of the corresponding transitions. Since
such type transitions occurred at loop level in the standard model, they can be
considered as good candidates to search for the new physics effects beyond the
SM.Comment: 18 Pages and 13 Table
Allelopathic and Antifungal potentials of endemic Salvia absconditiflora Greuter & Burdet collected from different locations in Turkey
We determined the antifungal and bioherbicidal properties of essential oils of Salvia absconditiflora. Its plant samples were collected from 10-locations in Kirsehir province, Turkey and dried in shade. Essential oils of dried plant samples were extracted by hydro-distillation method using a Schilcher device and the compounds identified in S. absconditiflora essential oils by GC-MS analysis were: Camphor (10.52-58.64%), Bicyclo [2.2.1] Heptane-2-One, 1.7.7 (21.94-30.16%) and viridiflorol (3.42-25.2%). S. absconditiflora essential oil (a dose of 10 mu l/petri dishes) inhibited the mycelium growth of Sclerotinia sclerotiorum and Alternaria solani pathogens by 9.3 and 54.40 %, respectively. At dose of 20 mu l/petri dish, the essential oil completely inhibited the mycelium growth of both pathogens. The S. absconditiflora essential oil at 20 mu l/petri dish. was 100 % phytotoxic to seed germination and seedling growth of Lepidum sativum and Amaranthus retroflexus. Thus S. absconditiflora essential oil can be used as an alternative to synthetic fungicide and herbicide to control the plant pathogenic fungi and weeds, respectively
Description of as a system with the fixed center approximation
We study the system with an aim to describe the
resonance. The chiral unitary approach has achieved success in a description of
systems of the light hadron sector. With this method, the system in
the isospin sector , is found to be a dominant component of the resonance. Therefore, by regarding the system as a cluster,
the resonance, we evaluate the system applying the
fixed center approximation to the Faddeev equations. We construct the
unitarized amplitude using the chiral unitary approach. As a result, we find a
peak in the three-body amplitude around 1739 MeV and a width of about 227 MeV.
The effect of the width of and is also discussed. We
associate this peak to the which has a mass of MeV
and a width of MeV
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