A multi-Regge analysis of the exclusive and inclusive production of low-mass rho-pion systems
Puhala, Michael John
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https://hdl.handle.net/2142/25544
Description
Title
A multi-Regge analysis of the exclusive and inclusive production of low-mass rho-pion systems
Author(s)
Puhala, Michael John
Issue Date
1979
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
multi-regge
low-mass rho-pion systems
Reggeized Deck model
Steinmann relation
Language
en
Abstract
We construct a Reggeized Deck model for the exclusive reaction pi- rho -> rho o pi- rho that satisfies the Steinmann relation in the physical region. An explanation is given for the success of the Reggeization in this low-rho/pi-mass region. Resonancelike behavior is isolated in the P-1I-cut term, and a resonance-type loop is shown to be present in the l+s wave Argand diagram.
We also consider in detail the multi-Regge expansion for the eight particle amplitude with one triple-Regge and two double-Regge couplings, appropriate to the inclusive reaction pi-rho -> rhoo pi- X. We show that under trivial conditions and with a suitable choice of helicity contours, the double-Regge couplings in the multi-Regge (MR) limit are identical, to leading order,with couplings obtained in the mixed helicity-pole Reggepole (HPRP) limit appropriate to inclusive reactions.
As a plausibility argument for the identity of the MR and HPRP limit, we present an intuitive picture of a way in which helicity poles may be visualized at the triple-Regge vertex. Assuming the identity of the double-Regge couplings in the exclusive and inclusive cases, we discuss the problem of isolating this mechanism experimentally. We propose experimental tests for the identity of the couplings. We discuss the origin of the problems associated with observing the Al meson in the exclusive
reaction, and discuss mechanisms by which it might be seen in the
inclusive case.
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