ar X iv : h ep - p h / 99 05 34 2 v 1 1 4 M ay 1 99 9 TUM / T 39 - 99 - 7 On scale dependence of QCD string operators ∗

ar X iv : h ep - p h / 99 05 46 9 v 1 2 5 M ay 1 99 9 DESY 99 – 060 hep - ph / 9905469 May 1999 W Boson Production at NLO ∗

We discuss W boson production at HERA including NLO QCD corrections. A detailed comparison with previous work is presented.

ar X iv : h ep - p h / 98 05 39 4 v 1 2 0 M ay 1 99 8 Odderon and QCD

A review is made of the odderon idea in high-energy physics, complemented by an outline of the recent calculations of the odderon properties in the perturbative QCD.

ar X iv : h ep - p h / 97 05 45 5 v 1 2 8 M ay 1 99 7 LECTURE 1 Spectral Fluctuations of the QCD Dirac Operator

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 05 28 4 v 1 1 0 M ay 1 99 9 The radiative ∆ → Nγ decay in light cone QCD

The g∆Nγ coupling for the ∆ → Nγ decay is calculated in framework of the light cone QCD sum rules and is found to be g∆Nγ = (1.6± 0.2) GeV . Using this value of g∆Nγ we estimate the branching ratio of the ∆ + → Nγ decay, which is in a very good agreement with the experimental result. e-mail: [email protected] e-mail: [email protected]