منابع مشابه
The Photon Structure Function at Small-x
It is shown that recent small–x measurements of the photon structure function F γ 2 (x,Q) by the LEP–OPAL collaboration are consistent with parameter–free QCD predictions at all presently accessible values of Q. Recently the OPAL collaboration [1] at the CERN–LEP collider has extended the measurements of the photon structure function F γ 2 (x,Q ) into the small–x region down to x ≃ 10, probing ...
متن کاملSmall - x behaviour of the polarized photon structure function F γ 3 ( x , Q 2 ) 1
We study the small-x behaviour of the polarized photon structure function F γ 3 , measuring the gluon transversity distribution, in the leading logarithmic approximation of perturbative QCD. There are two contributions, both arising from two-gluon exchange. The leading contribution to small-x is related to the BFKL pomeron and behaves like x −1−ω 2 , ω 2 = O(α S). The other contribution include...
متن کاملNuclear Shadowing and the Proton Structure Function at Small x
A new scaling variable is introduced in terms of which nuclear shadowing in deepinelastic scattering is universal, i.e. independent of A, Q2 and x. This variable can be interpreted as a measure of the number of gluons probed by the hadronic fluctuations of a virtual photon during their lifetime. According to recent data from the H1 and ZEUS experiments, the gluon density in a proton rises steep...
متن کاملBFKL evolution and universal structure function at very small x
The Balitskii-Fadin-Kuraev-Lipatov (BFKL) and the Gribov-Lipatov-Dokshitzer-Altarelli-Parisi (GLDAP) evolution equations for the diffractive deep inelastic scattering at 1 x ≫ 1 are shown to have a common solution in the weak coupling limit: F2(x,Q ) ∝ [αS(Q)] ( 1 x )∆IP . The exponent γ and the pomeron intercept ∆IP are related by γ∆IP = 4 3 for the Nf = 3 active flavors. The existence of this...
متن کاملThe Longitudinal Structure Function F L at Small X
We present a set of formulae to extract the longitudinal deep inelastic structure function F L from the transverse structure function F 2 and its derivative dF 2 /dlnQ 2 at small x. Using F 2 HERA data we obtain F L in the range 10 −4 ≤ x ≤ 10 −2 at Q 2 = 20 GeV 2. We present here the values of F L (x, Q 2) at small x, extracted from experimental HERA data 1,2 using the method of replacement of...
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ژورنال
عنوان ژورنال: Progress of Theoretical Physics
سال: 1999
ISSN: 0033-068X,1347-4081
DOI: 10.1143/ptp.102.819