Michelangelo L. Mangano

Multi-Parton Amplitudes in Gauge Theories

In this report we review recent developments in perturbation theory methods for gauge theories. We present techniques and results that are useful in the calculation of cross sections for processes with many final state partons which have applications in the study of multi-jet phenomena in high-energy Colliders.

Heavy quark multiplicities in gluon jets

Abstract In view of recent theoretical developments we reanalyse the production of heavy quark pairs inside gluon jets, and compare the new results with the prediction of the HERWIG shower Monte Carlo program.

QCD Tests in Proton-Antiproton Collisions

CONTENTS I. INTRO DUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 586 2. QCD IN HADRONIC COLLI SION S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 587 3. JET PRODUCTION 591 3.1 Inclusive Jet Production . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 591 3.2 X,: Jet Scaling with s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 599 3.3 Two-let Distributions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 1 3.4 Jet Fragmentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 603 3.5 Multijet Final States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 5 4. HEA VY FLA VOR PRODUCTION 609 4.1 Bottom Production . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 1 4.2 Charmonium Production . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 616 5. W AND Z PRODUCTION 618 5.1 Inclusive Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 618 5.2 Associated Jet Production . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 0 6. DIRECT PHOTON S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 623 6.1 Single-Photon Production . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 623 6.2 Double-Photon Production . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 626 7. CONCLU SION S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 628

The structure of gluon radiation in QCD

For massless QCD the hard scattering amplitudes are naturally written in terms of the dual color expansion. Here I present this expansion for purely gluonic processes and processes involving quark‐antiquark pairs and gluons. The properties of the sub‐amplitudes as well as explicit algebraic expressions are given for a number of these processess. Finally, I demonstrate how to recover massless QED amplitudes from the dual expansion of massless QCD.

B physics at CDF: results and prospects

Abstract In this presentation we review the latest B physics results from the CDF Collaboration at the Fermilab Tevatron Collider. We cover recently completed a