Production of three charged pions in pi minus proton interactions at 5 Bev/c
Terreault, Bernard
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https://hdl.handle.net/2142/25776
Description
Title
Production of three charged pions in pi minus proton interactions at 5 Bev/c
Author(s)
Terreault, Bernard
Issue Date
1969
Doctoral Committee Chair(s)
Kruse, U.E.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
charged pions
pi proton interactions
hydrogen bubble chamber
Language
en
Abstract
"The 72"" Bubble Chamber at the Lawrence Radiation Laboratory has
been exposed to a beam of 5 Bev/c pi- mesons and 150,000 photographs have
been taken.
As a part of this experiment, the interactions producing four
charged particles in the final states have been measured and the
reaction
pi-p -> ppi+pi-pi-
has been studied, with the emphasis placed on the three pions system.
The cross section for this reaction was found to be 1.80±0.45 mba
For the final analysis 6300 events (.286 ± .071 pb/event) were selected.
The mass spectra of the different particle combinations have been
investigated. The reaction has been found to be characterized by the
following features:
(1) Strong production of well-known resonances, in particular
the p (35% of the events), N1236 (30%) and various N IS.
(2) A broad enhancement in the pi+pi-pi- and in the popi mass
between 1.0 and 1.4 Bev, associated wllh momentum transfers to the proton
characteristic of diffraction-scattering. The data below the A2 mass
(1.26 Bev) are consistent with this enhancement being a state of spinparity
I+ with J = 0 along the incident pion direction. It does not z
appear to be entirely due to a Deck-type kinematic effect.
(3) Three peaks of marginal statistical significance in the
pi+pi-pi- mass, with masses (and widths) 1.06 Bev (40 Mev), 1.17 Bev
(60 Mev) and 1.475 Bev (30 Mev).
(4) Peripheral production of a meson of mass 1.62 Bev, width
about 100 Mev, decaying into pi+pi-pi-,and known as the A3 meson. Its
spin-parity is most probably 2-."
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