ar X iv : h ep - p h / 97 05 47 2 v 1 3 0 M ay 1 99 7 Remarks on Higgs boson production

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 / 96 05 31 0 v 1 1 5 M ay 1 99 6 O ( α 2 G F m 2 t ) Contributions to H → γγ

The rare decay H → γγ is a promising detection channel for an intermediate mass Higgs boson. We compute its two-loop O(αGFm 2 t ) correction in the standard model and find that it is much smaller than the corresponding QCD correction. The analogous correction to the amplitude for gg → H is recovered as a special case. The generalization of our result to other models is also briefly indicated.

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 05 32 1 v 1 1 5 M ay 1 99 7 LECTURE 10 Developing Transport Theory to Study the Chiral Phase Transition

ar X iv : h ep - p h / 97 05 42 3 v 1 2 6 M ay 1 99 7 The γ ∗ π 0 → γ form factor

The γπ → γ form factor is obtained within the Lagrangian quark model with separable interaction known to provide a good description of the pion observables at low energies. The pion-quarks vertex is chosen in a Gaussian form. The form factor obtained is close to the available experimental data and reaches smoothly the Brodsky-Lepage limit at Q ≈ 10 GeV.