Title

Dynamical breaking of string model in 1 + 1 dimension

Date of Award

1997

Degree Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Department

Physics

Advisor(s)

Carl Rosenzweig

Keywords

quantum chromodynamics, hadrons

Subject Categories

Elementary Particles and Fields and String Theory | Physics

Abstract

It is will known that above certain threshold energy in $e\sp+e\sp-$ collision, a shower of hadrons is produced. The formation of these hadrons is a low energy phenomenon. Perturbative QCD can not give a reliable calculation to predict the distribution of these hadrons. The string model, as a non perturbative solution is investigated. We confront the long unsolved problem of $(1-z)$ behavior of the distribution of the mesons near $z=1.$ A multistage fragmentation picture is developed whereby a string state can fragment several times before producing physically observed mesons. The fragmentation function of the second stage fragmentation provide an excellent fit to the observed data and naturally provide the necessary $(1-z)$ behavior.

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