611 research outputs found
Determination of the magnetic susceptibility of the quark condensate using radiative heavy meson decays
We use a light-cone sum rule (LCSR) analysis of the branching ratios of
radiative meson decays to contrain the value of the magnetic susceptibility of
the quark condensate . For the first time, we use a complete set of
three-particle distribution amplitudes that enables us to give a consistent
prediction for the branching ratios. Furthermore we will make use of a very
recent update of several non-perturbative parameters. Our final result for
(assuming asymptotic wave
functions) agrees with the currently used value of .Comment: 21 pages, 4 figures, references adde
QCD sum rules with finite masses
The concept of QCD sum rules is extended to bound states composed of
particles with finite mass such as scalar quarks or strange quarks. It turns
out that mass corrections become important in this context. The number of
relevant corrections is analyzed in a systematic discussion of the IR- and
UV-divergencies, leading in general to a finite number of corrections. The
results are demonstrated for a system of two massless quarks and two heavy
scalar quarks.Comment: 15 pages, including two pictures to be found in an extra file. Latex
neads epsf.st
Twist-3 Distribute Amplitude of the Pion in QCD Sum Rules
We apply the background field method to calculate the moments of the pion
two-particles twist-3 distribution amplitude (DA) in QCD sum
rules. In this paper,we do not use the equation of motion for the quarks inside
the pion since they are not on shell and introduce a new parameter to
be determined. We get the parameter in this approach. If
assuming the expansion of in the series in Gegenbauer polynomials
, one can obtain its approximate expression which can be
determined by its first few moments.Comment: 12 pages, 3 figure
On Possible Light-Torsion Mixing in Background Magnetic Field
The interaction of the light with propagating axial torsion fields in the
presence of an external magnetic field has been investigated. Axial torsion
fields appearing in higher derivative quantum gravity possess two states, with
spin one and zero, with different masses. The torsion field with spin-0 state
is a ghost that can be removed if its mass is infinite. We investigate the
possibility when the light mixes with the torsion fields resulting in the
effect of vacuum birefringence and dichroism. The expressions for ellipticity
and the rotation of light polarization axis depending on the coupling constant
and the external magnetic field have been obtained.Comment: 12 pages, title changed, shortened journal version, accepted in
Eur.Phys.J.
and couplings in QCD
We calculate the and couplings using QCD sum rules on the
light-cone. In this approach, the large-distance dynamics is incorporated in a
set of pion wave functions. We take into account two-particle and
three-particle wave functions of twist 2, 3 and 4. The resulting values of the
coupling constants are and .
From this we predict the partial width \Gamma (D^{*+} \ra D^0 \pi^+ )=32 \pm
5~ keV . We also discuss the soft-pion limit of the sum rules which is
equivalent to the external axial field approach employed in earlier
calculations. Furthermore, using and the pole
dominance model for the B \ra \pi and D\ra \pi semileptonic form factors
is compared with the direct calculation of these form factors in the same
framework of light-cone sum rules.Comment: 27 pages (LATEX) +3 figures enclosed as .uu file MPI-PhT/94-62 ,
CEBAF-TH-94-22, LMU 15/9
Interaction of the single-particle and collective degrees of freedom in non-magic nuclei: the role of phonon tadpole terms
A method of a consistent consideration of the phonon contributions to mass
and gap operators in non-magic nuclei is developed in the so-called g^2
approximation, where g is the low-lying phonon creation amplitude. It includes
simultaneous accounting for both the usual non-local terms and the phonon
tadpole ones. The relations which allow the tadpoles to be calculated without
any new parameters are derived. As an application of the results, the role of
the phonon tadpoles in the single-particle strength distribution and in the
single-particle energies and gap values has been considered. Relation to the
problem of the surface nature of pairing is discussed.Comment: 22 pages, 7 figure
Biomorphic SiC from peas and beans
Biomorphic porous SiC ceramics produced by impregnation with liquid or
vapor silicon of carbon matrices derived from peas (Pisum sativum L.) and beans
(Phaseolus) precursors were investigated. Optical and scanning electron microscopy was
used to study the structure of ceramics. It was shown that SiC ceramics made from
endosperm of peas and beans seeds has inherited the alveolate structure and possesses
many hierarchical pores with diameters varying between 20 to 100 Β΅m. Raman
spectroscopy investigations showed that the 3C polytype is formed at a synthesis
temperature of about 1550 β°C, and that both 3C and 6H-SiC are formed at temperatures
of about 1800 β°C. It is shown possibilities of production of ceramic articles of various
forms from seeds
ΠΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΡ ΡΡΡΡΠΊΡΡΡΡ ΠΈ ΠΌΠ΅Ρ Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΏΡΠΎΡΠ½ΠΎΡΡΠΈ ΠΊΠΎΡΡΠΈ ΠΏΠΎΡΠ»Π΅ ΠΏΡΠ½ΠΊΡΠΈΠΎΠ½Π½ΠΎΠΉ ΠΊΡΠΈΠΎΠ΄Π΅ΡΡΡΡΠΊΡΠΈΠΈ Π² ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ΅
Purpose of the study β to evaluate possible impact of cryoablation on a healthy bone and to identify probable causes of postoperative fractures.Materials and Methods. The authors performed cryoablation of the femur in the experiment on 8 mature rabbits of Soviet Chinchilla (SC) breed with a follow up for up to two months. Anitrogenous cryoprobe of 1.5 mm in diameter was introduced into the femur through a perforation hole. The bone was completely frozen up to -180Β°Π‘ in two cycles with continuous thermometry. Pathomorfological examinations were performed after 7 and 55 days along with assessment of bone hardness. Preparation of material stipulated sawing the bone at the fracture site along the bone axis. One half-bone was used for histological examination, and another one β for measuring mechanical properties by local pressing of a diamond indenter onto the bone at certain applied force. The distance between measurement points along the bone was 250 ΞΌm. Statistical processing included variance significance analysis using t-test.Results. The authors reported bone fractures at the site of cryodestruction in all animals in one week after the procedure. Statistical analysis of the measurements and histological examination demonstrated that freezing of the entire bone diameter up to -180Β°Π‘ results in its complete destruction. Strength reduction around the fracture site corresponded to the temperature distribution area in the range from -9ΒΊΠ‘ to -15ΒΊΠ‘. However, areas of cooling below -40ΒΊΠ‘ exhibited some bone segments with normal hardness. Mosaic pattern of strength reduction is explained by microcirculation disorders. Histology confirmed thrombosis of intraosseous blood vessels in the area of cryotherapy. The first focal signs of osteomalacia emerged by the end of the first week after cryoablation. Subsequently, the bone preserved its regenerative properties, but by the end of the second month after the procedure the histogenesis was still not completed and the bone did not regain its strength.Conclusion. The authors believe that a limited number of cases, the specific features of the angioarchitecture of animal bones and their ability to produce a heavy periosteal response do not allow to apply obtained quantitative outcomes of the present study to clinical situations. However, complete freezing of the entire bone diameter inevitably results in fracture formation.Π¦Π΅Π»Ρ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ β Π²ΡΡΠ²Π»Π΅Π½ΠΈΠ΅ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΡΡ
ΠΏΠΎΡΠ»Π΅Π΄ΡΡΠ²ΠΈΠΉ ΠΊΡΠΈΠΎΠ³Π΅Π½Π½ΠΎΠΉ ΠΎΠ±ΡΠ°Π±ΠΎΡΠΊΠΈ Π·Π΄ΠΎΡΠΎΠ²ΠΎΠΉ ΡΠ°ΡΡΠΈ ΠΊΠΎΡΡΠΈ ΠΈ Π²Π΅ΡΠΎΡΡΠ½ΡΡ
ΠΏΡΠΈΡΠΈΠ½ Π²ΠΎΠ·Π½ΠΈΠΊΠ½ΠΎΠ²Π΅Π½ΠΈΡ ΠΏΠΎΡΠ»Π΅ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΎΠ½Π½ΡΡ
ΠΏΠ΅ΡΠ΅Π»ΠΎΠΌΠΎΠ².ΠΠ°ΡΠ΅ΡΠΈΠ°Π» ΠΈ ΠΌΠ΅ΡΠΎΠ΄Ρ. ΠΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠΌ Π΄Π»Ρ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΏΠΎΡΠ»ΡΠΆΠΈΠ»ΠΈ Π±Π΅Π΄ΡΠ΅Π½Π½ΡΠ΅ ΠΊΠΎΡΡΠΈ 8 Π²Π·ΡΠΎΡΠ»ΡΡ
ΠΊΡΠΎΠ»ΠΈΠΊΠΎΠ² ΠΏΠΎΡΠΎΠ΄Ρ ΡΠΎΠ²Π΅ΡΡΠΊΠ°Ρ ΡΠΈΠ½ΡΠΈΠ»Π»Π°. Π Π±Π΅Π΄ΡΠ΅Π½Π½ΡΡ ΠΊΠΎΡΡΡ ΡΠ΅ΡΠ΅Π· ΠΏΠ΅ΡΡΠΎΡΠ°ΡΠΈΠΎΠ½Π½ΠΎΠ΅ ΠΎΡΠ²Π΅ΡΡΡΠΈΠ΅ Π²Π²ΠΎΠ΄ΠΈΠ»ΠΈ Π°Π·ΠΎΡΠ½ΡΠΉ ΠΊΡΠΈΠΎΠ·ΠΎΠ½Π΄ Π΄ΠΈΠ°ΠΌΠ΅ΡΡΠΎΠΌ 1,5 ΠΌΠΌ. ΠΠΎΡΡΡ ΠΏΠΎΠ»Π½ΠΎΡΡΡΡ ΠΏΡΠΎΠΌΠΎΡΠ°ΠΆΠΈΠ²Π°Π»ΠΈ Π΄ΠΎ -180ΒΊΠ‘ Π² Π΄Π²ΡΡ
ΡΠΈΠΊΠ»Π°Ρ
Ρ Π½Π΅ΠΏΡΠ΅ΡΡΠ²Π½ΠΎΠΉ ΡΠ΅ΡΠΌΠΎΠΌΠ΅ΡΡΠΈΠ΅ΠΉ. Π§Π΅ΡΠ΅Π· 7 ΠΈ 55 Π΄Π½Π΅ΠΉ Π²ΡΠΏΠΎΠ»Π½ΡΠ»ΠΈ ΠΏΠ°ΡΠΎΠΌΠΎΡΡΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΈ ΠΎΠΏΡΠ΅Π΄Π΅Π»ΡΠ»ΠΈ ΡΠ²Π΅ΡΠ΄ΠΎΡΡΡ ΠΊΠΎΡΡΠΈ. ΠΠΎΠ΄Π³ΠΎΡΠΎΠ²ΠΊΠ° ΠΏΡΠ΅ΠΏΠ°ΡΠ°ΡΠΎΠ² Π²ΠΊΠ»ΡΡΠ°Π»Π° ΡΠ°ΡΠΏΠΈΠ»ΠΈΠ²Π°Π½ΠΈΠ΅ ΠΊΠΎΡΡΠΈ Π² ΠΌΠ΅ΡΡΠ΅ ΠΏΠ΅ΡΠ΅Π»ΠΎΠΌΠ° Π²Π΄ΠΎΠ»Ρ ΠΎΡΠΈ. ΠΠ΄Π½Π° ΠΏΠΎΠ»ΠΎΠ²ΠΈΠ½Π° Π½Π°ΠΏΡΠ°Π²Π»ΡΠ»Π°ΡΡ Π½Π° Π³ΠΈΡΡΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠ΅, Π²ΡΠΎΡΠ°Ρ ΠΏΠΎΠ΄Π²Π΅ΡΠ³Π°Π»Π°ΡΡ ΠΈΠ·ΠΌΠ΅ΡΠ΅Π½ΠΈΡ ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΏΡΠΎΡΠ½ΠΎΡΡΠΈ ΠΏΡΡΠ΅ΠΌ Π»ΠΎΠΊΠ°Π»ΡΠ½ΠΎΠ³ΠΎ Π²Π΄Π°Π²Π»ΠΈΠ²Π°Π½ΠΈΡ Π°Π»ΠΌΠ°Π·Π½ΠΎΠ³ΠΎ ΠΈΠ½Π΄Π΅Π½ΡΠΎΡΠ° Π² ΠΊΠΎΡΡΡ ΠΏΠΎΠ΄ Π΄Π΅ΠΉΡΡΠ²ΠΈΠ΅ΠΌ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½Π½ΠΎΠΉ ΡΠΈΠ»Ρ. Π Π°ΡΡΡΠΎΡΠ½ΠΈΠ΅ ΠΌΠ΅ΠΆΠ΄Ρ ΡΠΎΡΠΊΠ°ΠΌΠΈ ΠΈΠ·ΠΌΠ΅ΡΠ΅Π½ΠΈΡ Π²Π΄ΠΎΠ»Ρ ΠΊΠΎΡΡΠΈ ΡΠΎΡΡΠ°Π²Π»ΡΠ»ΠΎ 250 ΠΌΠΊΠΌ. Π‘ΡΠ°ΡΠΈΡΡΠΈΡΠ΅ΡΠΊΠ°Ρ ΠΎΠ±ΡΠ°Π±ΠΎΡΠΊΠ° Π²ΠΊΠ»ΡΡΠ°Π»Π° Π²Π°ΡΠΈΠ°ΡΠΈΠΎΠ½Π½ΡΠΉ Π°Π½Π°Π»ΠΈΠ· Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ ΠΊΡΠΈΡΠ΅ΡΠΈΡ Π‘ΡΡΡΠ΄Π΅Π½ΡΠ° Π΄Π»Ρ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ Π·Π½Π°ΡΠΈΠΌΠΎΡΡΠΈ ΡΠ°Π·Π»ΠΈΡΠΈΠΉ.Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ. Π£ Π²ΡΠ΅Ρ
ΠΆΠΈΠ²ΠΎΡΠ½ΡΡ
ΡΠ΅ΡΠ΅Π· Π½Π΅Π΄Π΅Π»Ρ Π²ΠΎΠ·Π½ΠΈΠΊΠ»ΠΈ ΠΏΠ΅ΡΠ΅Π»ΠΎΠΌΡ ΠΊΠΎΡΡΠΈ Π² ΠΌΠ΅ΡΡΠ΅ ΠΊΡΠΈΠΎΠ΄Π΅ΡΡΡΡΠΊΡΠΈΠΈ. Π‘ΡΠ°ΡΠΈΡΡΠΈΡΠ΅ΡΠΊΠΈΠΉ Π°Π½Π°Π»ΠΈΠ· ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠΎΠ² ΠΈΠ·ΠΌΠ΅ΡΠ΅Π½ΠΈΠΉ ΠΈ Π³ΠΈΡΡΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠ΅ ΠΏΠΎΠΊΠ°Π·Π°Π», ΡΡΠΎ ΠΎΡ
Π»Π°ΠΆΠ΄Π΅Π½ΠΈΠ΅ Π΄ΠΎ -180ΒΊΠ‘ Ρ Π·Π°ΠΌΠΎΡΠ°ΠΆΠΈΠ²Π°Π½ΠΈΠ΅ΠΌ Π²ΡΠ΅Π³ΠΎ Π΄ΠΈΠ°ΠΌΠ΅ΡΡΠ° ΠΊΠΎΡΡΠΈ Π²ΡΠ·ΡΠ²Π°Π΅Ρ Π΅Π΅ ΠΏΠΎΠ»Π½ΠΎΠ΅ ΡΠ°Π·ΡΡΡΠ΅Π½ΠΈΠ΅. Π‘Π½ΠΈΠΆΠ΅Π½ΠΈΠ΅ ΠΏΡΠΎΡΠ½ΠΎΡΡΠΈ Π²ΠΎΠΊΡΡΠ³ ΠΌΠ΅ΡΡΠ° ΠΏΠ΅ΡΠ΅Π»ΠΎΠΌΠ° ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΠΎΠ²Π°Π»ΠΎ Π·ΠΎΠ½Π΅ ΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΠ½ΠΎΠ³ΠΎ ΡΠ°ΡΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ Π² Π΄ΠΈΠ°ΠΏΠ°Π·ΠΎΠ½Π΅ ΠΎΡ -9ΒΊΠ‘ Π΄ΠΎ -15ΒΊΠ‘. ΠΠ΄Π½Π°ΠΊΠΎ ΠΏΡΠΈ ΡΡΠΎΠΌ Π² Π·ΠΎΠ½Π΅ ΠΎΡ
Π»Π°ΠΆΠ΄Π΅Π½ΠΈΡ Π½ΠΈΠΆΠ΅ -40ΒΊΠ‘ Π²ΡΡΠ²Π»ΡΠ»ΠΈΡΡ ΡΡΠ°ΡΡΠΊΠΈ ΠΊΠΎΡΡΠΈ Ρ Π½ΠΎΡΠΌΠ°Π»ΡΠ½ΠΎΠΉ ΡΠ²Π΅ΡΠ΄ΠΎΡΡΡΡ. ΠΠΎΠ·Π°ΠΈΡΠ½ΠΎΡΡΡ ΡΠ½ΠΈΠΆΠ΅Π½ΠΈΡ ΠΏΡΠΎΡΠ½ΠΎΡΡΠΈ ΠΎΠ±ΡΡΡΠ½ΡΠ»Π°ΡΡ Π½Π°ΡΡΡΠ΅Π½ΠΈΠ΅ΠΌ ΠΌΠΈΠΊΡΠΎΡΠΈΡΠΊΡΠ»ΡΡΠΈΠΈ. ΠΠΈΡΡΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ Π²ΡΡΠ²ΠΈΠ»ΠΈ ΡΡΠΎΠΌΠ±ΠΎΠ· Π²Π½ΡΡΡΠΈΠΊΠΎΡΡΠ½ΡΡ
ΠΊΡΠΎΠ²Π΅Π½ΠΎΡΠ½ΡΡ
ΡΠΎΡΡΠ΄ΠΎΠ² Π² Π·ΠΎΠ½Π΅ ΠΊΡΠΈΠΎΠ²ΠΎΠ·Π΄Π΅ΠΉΡΡΠ²ΠΈΡ. ΠΠ΅ΡΠ²ΡΠ΅ ΠΎΡΠ°Π³ΠΎΠ²ΡΠ΅ ΠΏΡΠΈΠ·Π½Π°ΠΊΠΈ ΠΎΡΡΠ΅ΠΎΠΌΠ°Π»ΡΡΠΈΠΈ ΠΏΠΎΡΠ²Π»ΡΠ»ΠΈΡΡ ΠΊ ΠΊΠΎΠ½ΡΡ ΠΏΠ΅ΡΠ²ΠΎΠΉ Π½Π΅Π΄Π΅Π»ΠΈ ΠΏΠΎΡΠ»Π΅ ΠΊΡΠΈΠΎΠ°Π±Π»Π°ΡΠΈΠΈ. Π Π΄Π°Π»ΡΠ½Π΅ΠΉΡΠ΅ΠΌ ΠΊΠΎΡΡΡ ΡΠΎΡ
ΡΠ°Π½ΡΠ»Π° ΡΠΏΠΎΡΠΎΠ±Π½ΠΎΡΡΡ ΠΊ ΡΠ΅Π³Π΅Π½Π΅ΡΠ°ΡΠΈΠΈ, Π½ΠΎ ΠΊ ΠΊΠΎΠ½ΡΡ Π²ΡΠΎΡΠΎΠ³ΠΎ ΠΌΠ΅ΡΡΡΠ° Π³ΠΈΡΡΠΎΠ³Π΅Π½Π΅Π· Π΅ΡΠ΅ Π½Π΅ Π·Π°Π²Π΅ΡΡΠ°Π»ΡΡ, ΠΊΠΎΡΡΡ Π½Π΅ Π²ΠΎΡΡΡΠ°Π½Π°Π²Π»ΠΈΠ²Π°Π»Π° ΡΠ²ΠΎΡ ΠΏΡΠΎΡΠ½ΠΎΡΡΡ.ΠΠ°ΠΊΠ»ΡΡΠ΅Π½ΠΈΠ΅. ΠΠ³ΡΠ°Π½ΠΈΡΠ΅Π½Π½ΠΎΠ΅ ΡΠΈΡΠ»ΠΎ Π½Π°Π±Π»ΡΠ΄Π΅Π½ΠΈΠΉ, Π²ΠΈΠ΄ΠΎΠ²ΡΠ΅ ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΠΈ Π°Π½Π³ΠΈΠΎΠ°ΡΡ
ΠΈΡΠ΅ΠΊΡΠΎΠ½ΠΈΠΊΠΈ ΠΊΠΎΡΡΠΈ ΠΆΠΈΠ²ΠΎΡΠ½ΡΡ
ΠΈ ΠΈΡ
ΡΠΏΠΎΡΠΎΠ±Π½ΠΎΡΡΡ ΠΊ ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½ΠΈΡ ΠΌΠΎΡΠ½ΠΎΠΉ ΠΏΠ΅ΡΠΈΠΎΡΡΠ°Π»ΡΠ½ΠΎΠΉ ΡΠ΅Π°ΠΊΡΠΈΠΈ Π½Π΅ ΠΏΠΎΠ·Π²ΠΎΠ»ΡΡΡ ΠΏΠ΅ΡΠ΅Π½ΠΎΡΠΈΡΡ ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²Π΅Π½Π½ΡΠ΅ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ Π½Π° ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΡΠΈΡΡΠ°ΡΠΈΠΈ. ΠΠ΄Π½Π°ΠΊΠΎ ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½ΠΈΠ΅ ΠΏΠ΅ΡΠ΅Π»ΠΎΠΌΠ° ΠΎΠΊΠ°Π·ΡΠ²Π°Π΅ΡΡΡ Π½Π΅ΠΈΠ·Π±Π΅ΠΆΠ½ΡΠΌ Π² ΡΠ»ΡΡΠ°Π΅ ΠΏΠΎΠ»Π½ΠΎΠ³ΠΎ ΠΏΡΠΎΠΌΠΎΡΠ°ΠΆΠΈΠ²Π°Π½ΠΈΡ Π²ΡΠ΅Π³ΠΎ Π΄ΠΈΠ°ΠΌΠ΅ΡΡΠ° ΠΊΠΎΡΡΠΈ
Strong Couplings of Heavy Mesons to A Light Vector Meson in QCD
We make a detailed analysis of the and
strong couplings and
using QCD light cone sum rules(LCSR). The
existing some negligence is pointed out in the previous LCSR calculation on
) and an updated estimate is presented. Our
findings can be used to understand the behavior of the
semileptonic form factors at large momentum transitions.Comment: 15 pages, latex, 2 figures, version appearing in PRD, typos correcte
Radiative and decays in light cone QCD sum rules
The radiative decays are investigated
in the framework of light cone QCD sum rules. The transition amplitude and
decay rates are estimated.It is shown that our results on branching ratios of D
meson decays are in good agreement with the existing experimental data.Comment: 13 pages, Latex, 3 figure
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