منابع مشابه
Goldstone Boson's Valence-quark Distribution *
Dynamical chiral symmetry breaking (DCSB) is one of the keystones of low-energy hadronic phenomena. Dyson-Schwinger equations provide a model-independent quark-level understanding and correlate that with the behaviour of the pion’s Bethe-Salpeter amplitude. This amplitude is a core element in the calculation of pion observables and combined with the dressed-quark Schwinger function required by ...
متن کاملThe Valence Quark Distribution of the Pion
The pion structure function is investigated in a simple model, where the pion and its constituent quark fields are coupled through the simplest pseudoscalar coupling. The imaginary part of the forward γπ → γπ scattering amplitude is evaluated and related to the structure functions. It is shown that the introduction of nonperturbative effects, linked to the size of the pion, allows a connection ...
متن کاملLeading Quark Distribution Functions
Current fragmentation in semiinclusive deep inelastic leptoproduction offers, besides refinement of inclusive measurements such as flavor separation and access to the chiral-odd quark distribution functions hq1(x) = δq(x), the possibility to investigate intrinsic transverse momentum of hadrons via azimuthal asymmetries. LEADING QUARK DISTRIBUTION FUNCTIONS In deep-inelastic leptoproduction (DIS...
متن کاملInterference Fragmentation Functions and Valence Quark Spin Distributions in the Nucleon∗
We explore further applications of the twist-two quark interference fragmentation functions introduced earlier. We show that semi-inclusive production of two pions in the current fragmentation region in deep inelastic scattering of a longitudinally polarized electron on a longitudinally polarized nucleon can provide a probe of the valence quark spin (or helicity difference) distribution in the ...
متن کاملComment on “Interference Fragmentation Functions and Valence Quark Spin Distributions in the Nucleon”
Jaffe, Jin, and Tang have proposed to measure the helicity of a fragmenting quark by using the angular distribution of pion pairs in a region where ρ − σ interference is important. I demonstrate that, independently of final-state interactions and interference effects, such an effect is forbidden by parity invariance. It is interesting to find observables constructed from the final state of a je...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 1999
ISSN: 0556-2821,1089-4918
DOI: 10.1103/physrevd.59.034013