This item is only available for download by members of the University of Illinois community. Students, faculty, and staff at the U of I may log in with your NetID and password to view the item. If you are trying to access an Illinois-restricted dissertation or thesis, you can request a copy through your library's Inter-Library Loan office or purchase a copy directly from ProQuest.
Permalink
https://hdl.handle.net/2142/25746
Description
Title
The reaction p p -> p p pi+ pi- at 7.9 BeV/c
Author(s)
Grether, Donald Frank
Issue Date
1968
Doctoral Committee Chair(s)
Sard, R.D.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
hydrogen bubble chamber
quasi-three body production
pion exchange model
Language
en
Abstract
The reaction p p -> p p pi+ pi- has been studied at an
incident momentum of 7.9 BeV/c using the Brookhaven 80
inch hydrogen bubble chamber. App'roximate1y 3600 events
of the 'reaction were identified; the cross section was
determined to be 2.54 +/- .13 mb.
The reaction is found to be dominated by production
of the quasi-three body final state N*++ p pi-. A simple
one pion exchange model is compared to the data and is
shown to give gene'ra11y good results for invariant mass
distributions for the entire final state, and for mass and
angular distributions for the quasi-three body state. Discrepancies
between the data and the model are found to be
primarily associated with enhancements in the N*++ pi-
of p pi+pi- mass distributions at about 1425 MeV and 1'700
MeV. Examination of the 1425 MeV enhancement indicates
an apparent interference process rather than an incoherent
sum of one pion exchange background and resonance production;
the enhancement could not be identified as the
N*(1470), the P11
wave resonance of pi-p phase shift analysis.
Examination of the pi+ pi- mass distribution gives some
indication for production of the p meson, but no indication
of other pi+ pi- resonances. No evidence is found for resonances
with Baryon number = 2.
Use this login method if you
don't
have an
@illinois.edu
email address.
(Oops, I do have one)
IDEALS migrated to a new platform on June 23, 2022. If you created
your account prior to this date, you will have to reset your password
using the forgot-password link below.
