Small x contributions to the structure function FL(x, Q2)
نویسندگان
چکیده
منابع مشابه
DESY 95-124 hep-ph/9507271 Nonsinglet Contributions to the Structure Function g1 at Small-x
Nonsinglet contributions to the g1(x,Q ) structure function are calculated in the double-logarithmic approximation of perturbative QCD in the region x ≪ 1. Double logarithmic contributions of the type (αs ln (1/x))k which are not included in the GLAP evolution equations are shown to give a stronger rise at small-x than the extrapolation of the GLAP expressions. Further enhancement in the small-...
متن کاملThe 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 کاملAsymptotic solutions of the evolution equation for the polarized nucleon structure function g2 (x, Q2)
We show that quark operators of twist 3 contributing to the polarized nucleon structure function gtW.3 (x, Q2) decouple from the evolution equation for the quark-gluon operators of the same twist in two important limits, Nc--,~ and n--,~(Nc is the number of colours and n refers to the nth moment of g2). The anomalous dimensions for the quark operators turn out to be always the lowest ones in th...
متن کاملMEASUREMENT AND QCD-ANALYSIS OF THE PROTON STRUCTURE FUNCTION F2(x;Q2) AT HERA
New results on measurements of the proton structure function F 2 (x;Q 2) from H1 and ZEUS at HERA are presented. The data were collected in 1995 and 1996 covering the range 0:16 Q 2 90 GeV 2 and reaching values of x down to 210 ?6. Contrary to observations at values of Q 2 10 GeV 2 , the rise in F 2 with decreasing x is found to be weaker at low Q 2. Conventional NLO QCD evolution equations pro...
متن کاملThe Singlet Contribution to the Structure Function g 1 ( x , Q 2 ) at Small x
The resummation of O(α l+1 s ln 2l x) terms in the evolution equation of the singlet part of g 1 (x, Q 2) is carried out. The corresponding singlet evolution kernels are calculated explicitely. The leading small-x contribution to the three-loop splitting function matrix is determined in the MS scheme. Relations are derived for the case of N = 1 supersymmetric Yang–Mills field theory. Numerical ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 1995
ISSN: 0920-5632
DOI: 10.1016/0920-5632(95)00035-8