The Three Jet Process in Virtual Photon-Photon Annihilation.
Three jet production in quantum chromodynamics is studied through the processes gamma^ *gamma^* to q| qg and g^* g^* to q| qg with respect to the jet broadening parameter called the transverse momentum perpendicular to the transverse thrust axis, developed by Ellis and Webber. The helicity amplitude methods developed by Farrar and Neri are used to derive the amplitudes for the Feynman diagrams of these three jet processes in lowest order in the coupling for each combination of photon and gluon polarizations and fermion chiralities. The transverse momentum perpendicular to the transverse thrust axis is then numerically determined by running the encoded formula through the VEGAS Monte Carlo integration routine. Results indicate the jet broadening remains rather flat with increasing photon virtuality. In the appendices, calculations towards the one loop correction for gammagamma^* to q| qg are given.
- Pub Date:
- Physics: Elementary Particles and High Energy