Higher-order corrections to timelike jets

Higher–Order Corrections to Instantons

The energy levels of the double-well potential receive, beyond perturbation theory, contributions which are non-analytic in the coupling strength; these are related to instanton effects. For example, the separation between the energies of oddand even-parity states is given at leading order by the one-instanton contribution. However to determine the energies more accurately multi-instanton confi...

NEXT-TO-LEADING ORDER CORRECTIONS TO e+e− → FOUR JETS

I present a general purpose Monte Carlo program for calculating the next-to-leading order corrections to arbitrary four-jet quantities in electron-positron annihilation. In the current version of the program, some subleading in color terms are neglected. As an example, I calculate the four-jet rate in the Durham scheme as well as the BengtssonZerwas angular distribution at O(αs) and compare the...

Higher-order Qcd Corrections to Γ

In the study of scattering phenomena in the limit of very large energies at fixed momentum transfer, one must face the fact that the two most promising probes of BFKL physics, namely smallx effects in DIS and large-rapidity-gap events in dijet production at hadron colliders, are inherently dependent upon long-distance physics, due to the presence of hadrons in the initial state; this poses seri...

Higher-order Corrections to Higgs-boson Decays *

One of the great puzzles of elementary particle physics today is whether nature makes use of the Higgs mechanism of spontaneous symmetry breaking to generate the observed particle masses. The Higgs boson, H , is the missing link sought to verify this concept in the Standard Model. Many of the properties of the Higgs boson are fixed, e.g., its couplings to the gauge bosons, gV VH = 2 G 1/2 F M 2...

Higher Order Corrections to H± Production