Basic features of the pion valence-quark distribution function
نویسندگان
چکیده
منابع مشابه
The 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 کاملDirect measurement of the pion valence-quark momentum distribution, the pion light-cone wave function squared.
We present the first direct measurements of the pion valence-quark momentum distribution which is related to the square of the pion light-cone wave function. The measurements were carried out using data on diffractive dissociation of 500 GeV/c pi(-) into dijets from a platinum target at Fermilab experiment E791. The results show that the /q&q> light-cone asymptotic wave function describes the d...
متن کاملQuark Distribution Function in Pion within Instanton Liquid Model
We calculate the leading-twist valence-quark distribution function in the pion at a low normalization scale of an order of the inverse average size of an instanton ρc. The quark-pion dynamics and the construction of the quark-pion vertex function are considered in the framework of the instanton liquid model. The parameters of instanton vacuum, the effective instanton radius and quark mass, are ...
متن کاملGoldstone 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 کاملSoft-gluon resummation and the valence parton distribution function of the pion.
We determine the valence parton distribution function of the pion by performing a new analysis of data for the Drell-Yan process π- N → μ+ μ- X. Compared to previous analyses, we include next-to-leading-logarithmic threshold resummation effects in the calculation of the Drell-Yan cross section. As a result of these, we find a considerably softer valence distribution at high momentum fractions x...
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: Physics Letters B
سال: 2014
ISSN: 0370-2693
DOI: 10.1016/j.physletb.2014.08.009