O(αs) spin-dependent weak structure functions
نویسندگان
چکیده
منابع مشابه
Spin-Dependent Structure Functions of the Photon
The implications of the positivity constraint on the presently unknown polarized structure function of the photon, g 1 (x,Q 2), are studied in detail. In particular the non–trivial consequences of this constraint, |g 1 (x,Q 2)| ≤ F γ 1 (x,Q 2), in the next– to–leading order analysis of g 1 are pointed out by employing appropriate (DIS) factorization schemes related to g 1 and F γ 1 (rather than...
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A confusing variety of new and exotic fragmentation functions (FFs) is discussed recently, in particular in the context of the extraction of the third, leading twist – hitherto unknown – nucleon distribution function. This transversity distribution h1(x) (frequently also denoted δq(x) or ∆Tq(x)) involves a flip of quark chirality, and therefore, requires a second chiral-odd function to form a c...
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The implications of the positivity constraint, |g γ(P 2) 1 (x,Q 2)| ≤ F γ(P 2) 1 (x,Q 2), on the presently unknown spin–dependent structure function g γ(P 2) 1 (x,Q 2) of real and virtual photons are studied at scales Q2 ≫ P 2 where longitudinally polarized photons dominate physically relevant cross sections. In particular it is shown how to implement the physical constraints of positivity and ...
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We address the question how the spin-dependent nucleon structure function g1 ( x,Q ) gets modified when the nucleon is bound inside a nucleus. We analyze the influence of nuclear interactions using the ∆−π model, known to describe well the unpolarized effect, and the free polarized parton distributions. The results for the neutron in He and proton in H, Li and F are presented, showing significa...
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Parton distribution functions in the nucleons have been obtained primarily through lepton-induced deep-inelastic scattering (DIS) experiments. One of the most important unresolved issues in our current knowledge of parton distributions is the role of gluons for describing the nucleon spin. While gluon polarization, ∆G(x), could in principle be deduced from the Q-evolution of the polarized struc...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 1995
ISSN: 0556-2821
DOI: 10.1103/physrevd.51.6052