JOINT PARTICLE SEMINAR

Date: Wednesday, 19 May 2004 Time: 3:00 p.m.

Place: 4135 Frederick Reines Hall

Speaker: Shahriar Abachi, UCLA

Title: A Persuasive Scheme for Hadronization Based on a Space-Time Area Law

Abstract: The perturbative treatment of strong couplings between high energy quarks and gluons has been applied and tested in several fronts. The non-perturbative regime however is still lagging behind and a correct or "preferred" approach is not yet designated. Nevertheless, QCD calculations with expansions in term of 1/g on the lattice have enjoyed some success. It appears that the cleanest environment for testing the success of such approach is in the studies of hadronization in e+ e- collisions, where the perturbative parts of events, being essentially common for all, are effectively decoupled. The approach chosen here is a phenomenological one. Thus lattice calculations are not directly applied; rather the general feature of the prediction of this approach is employed. It is a known fact that nearly all QCD on the lattice calculations commonly predict a space-time area law for the action in the non-perturbative regime. It is this simple general prediction that we have adopted and utilized as the main principle for explaining observables in hadronization. We have compelling evidence that this single adoption sufficiently explains qualitative features observed in hadronization measurements and quantitatively predicts all the rates and energy profiles with great accuracy. We have thereby freed ourselves from over-parametrizated modeling seen in all competing approaches (such as Lund's) and have instead focused on identifying the underlying physics with persuasive results.

Host: J. Feng