ar X iv : h ep - p h / 97 11 45 1 v 1 2 4 N ov 1 99 7 A study of hybrid quarkonium using lattice QCD

ar X iv : h ep - p h / 97 10 23 0 v 2 1 9 N ov 1 99 7 KEK - TH - 546 Oct . ’ 97 Domain wall solution for vectorlike model

Domain wall solution for Nc = Nf supersymmetric QCD is constructed. Astrophysical implications of the domain wall configuration is also discussed. [email protected] 1

ar X iv : h ep - p h / 97 11 22 7 v 1 4 N ov 1 99 7 TUM / T 39 - 97 - 28 Hard Exclusive Meson Production and Nonforward Parton Distributions ∗

We present an analysis of twist-2, leading order QCD amplitudes for hard exclusive leptoproduction of mesons in terms of double/nonforward parton distribution functions. After reviewing some general features of nonforward nucleon matrix elements of twist-2 QCD string operators, we propose a phenomenological model for quark and gluon nonforward distribution functions of nucleons. The correspondi...

ar X iv : h ep - p h / 99 11 23 7 v 1 4 N ov 1 99 9 QCD

Nonperturbative QCD approach is systematically derived starting from the QCD Lagrangian. Treating spin effects as a perturbation, one obtains the universal effective Hamiltonian describing mesons, hybrids and glueballs. Constituent mass of quark and gluon is calculated via string tension. The resulting spectrum of mesons, hybrids and glueballs obtained is in good overall agreement with lattice ...

ar X iv : h ep - p h / 97 11 22 6 v 1 4 N ov 1 99 7 Instantons and Polarized Structure Functions

The contribution of the quark-quark and quark-gluon interaction induced by instantons to the valence quark and proton spin-dependent structure functions g 1 (x, Q 2) is estimated within the instanton liquid model for QCD vacuum. It is shown, that this interaction leads to a rather large violation of the Ellis-Jaffe sum rule.

ar X iv : h ep - e x / 97 11 02 0 v 1 2 6 N ov 1 99 7 CLNS 97 / 1521