Structure functions near the chiral limit
نویسندگان
چکیده
منابع مشابه
Structure functions near the chiral limit ∗
Understanding the structure of hadrons in terms of quark and gluon constituents (partons), in particular how quarks and gluons provide the binding and spin of the nucleon, is one of the outstanding problems in particle physics. Moments of parton distribution functions, such as 〈x〉 and gA = ∆u − ∆ d, are benchmark calculations in lattice QCD. To compare the lattice results with experiment, one m...
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We report on the results of our calculation of meson correlators in a finite volume. The calculation is carried out in the quenched approximation near the chiral limit (down to mq = 2.6 MeV) using the overlap fermion. For these small quark masses, the scalar and pseudo-scalar correlators are well approximated with a few hundred eigenmodes. The results for both connected and disconnected correla...
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Results for nucleon matrix elements (arising from moments of structure functions) and form factors from a mixture of runs using Wilson, clover and overlap fermions (both quenched and unquenched) are presented and compared in an effort to explore the size of the chiral ‘regime’, lattice spacing errors and quenching artefacts. While no run covers this whole range of effects the partial results in...
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The flavor asymmetry of the sea quark distribution as well as the unexpectedly small quark spin fraction of the nucleon are two outstanding discoveries recently made in the physics of deep-inelastic structure functions. We evaluate here the corresponding quark distribution functions within the framework of the chiral quark soliton model, which is an effective quark model of baryons maximally in...
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We calculate the chiral odd quark distributions and the corresponding structure functions hT (x,Q ) and hL(x,Q ) within the Nambu–Jona–Lasinio chiral soliton model for the nucleon. The Q evolution of the twist–2 contributions is performed according to the standard GLAP formalism while the twist–three piece, hL(x), is evolved according to the large NC scheme. We carry out a comparison between th...
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ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 2003
ISSN: 0920-5632
DOI: 10.1016/s0920-5632(03)01566-4