3,468 research outputs found
The QCD Analysis of the Structure Functions and Effective Nucleon Mass
On the basis of the target mass corrections to structure functions of
deep-inelastic scattering of leptons, we evaluate effective nucleon mass that
turns out to be twice for deep-inelastic scattering on the nucleus
target and equals for the hydrogen target.Comment: LATEX, 6 pages, no figure
Main results of atmospheric fine structure parameter observation in the lower thermosphere
The capabilities of the radiometeor method of wind measurement increase with the increase of the transmitted power of radar stations fitted with goniometric systems which enables the observation of shower meteors along with sporadic background. In shower observations the meteor zone reflecting area narrows to the echo surface which is perpendicular to the flux radiant. Favorable conditions are created for singling out atmospheric disturbances in which the wave front is parallel to the echo surface which plays, in this case, the role of a frequency filter. For the first time this technique allowed wave disturbances with periods of approx. greater than 4 min. to be measured, with about a 99 percent probability of exceeding the level of the turbulence noise, during the Geminid and Perseid showers. Maximum values of such wave disturbance amplitudes were about 15 to 20 m/s, with lifetimes up to 2 hrs
On a Possibility to Determine the Sign of the Polarized Gluon Distribution
We investigate the possibility to draw conclusions on the sign of the
spin-dependent gluon distribution, , from existing polarized
DIS data. The spin-dependent parton distributions , and are constructed
in the framework of a phenomenological procedure taking into account some
assumptions on signs of valence and sea parton distributions motivated by 't
Hooft's mechanism of quark-quark interaction induced by instantons. The axial
gluon anomaly and data on integral quark contributions to the proton spin,
, and , are also taken into
account. Predictions for the - and -dependencies of the polarized
proton and neutron structure functions, and , are compared to
experimental data. It is shown that the neutron structure function, , is
especially sensitive to the sign of . The results of our
analysis supports the conclusion that this sign should be positive.Comment: 14 pages, latex, 12 figure
Constraints on "Second Order Fixed Point" QCD from the CCFR Data on Deep Inelastic Neutrino-Nucleon Scattering
The results of LO {\it Fixed point} QCD (FP-QCD) analysis of the CCFR data
for the nucleon structure function are presented. The
predictions of FP-QCD, in which the Callan-Symanzik function admits a
{\it second order} ultraviolet zero at are in good
agreement with the data. Constraints for the possible values of the
function parameter regulating how fast tends to its
asymptotic value are found from the data. The corresponding
values of are also determined. Having in mind our recent " First
order fixed point" QCD fit to the same data we conclude that in spite of the
high precision and the large kinematic range of the CCFR data they
cannot discriminate between QCD and FP-QCD predictions for .Comment: 8 pages, LaTe
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