SEARCH FOR GLUEBALL PRODUCTION IN NEGATIVE PION PROTON ---> PHI PHI N.
Item
-
Title
-
SEARCH FOR GLUEBALL PRODUCTION IN NEGATIVE PION PROTON ---> PHI PHI N.
-
Identifier
-
AAI8515612
-
identifier
-
8515612
-
Creator
-
CHAN, CHANG SING.
-
Contributor
-
S. J. Lindenbaum
-
Date
-
1985
-
Language
-
English
-
Publisher
-
City University of New York.
-
Subject
-
Mathematics
-
Abstract
-
The present dissertation describes an investigation of the reaction: (UNFORMATTED TABLE FOLLOWS).;(pi)('-)p (--->) (phi) (phi) n (A.1).;(--->) K('+)K('-).;(--->) K('+)K('-).;(TABLE ENDS).;at 22 GeV/c. The experiment was performed by the BNL/CCNY collaboration in an unseparated negative pion beam from the Brookhaven Alternating Gradient Synchrotron using the BNL Multiparticle Spectrometer II. A collection of about 4000 (phi)(phi)n events has been observed during two spring runs in 1982 and 1983. The (phi)(phi) system has I('G) = O('+) and C = +. Statistically, this quantity of data samples is sufficient to allow for a meaningful partial wave analysis on the (phi)(phi) system.;In order to determine the partial waves playing a major role in the (phi)(phi) spectrum the isobar model was used, the events in the mass region 2.04 and 2.64 GeV were fitted with both coherent and incoherent backgrounds plus additional partial waves of specific J('P), L, S, M, and exchange naturality (eta) (see Table 2.1 of main text). All possible partial waves with permitted values of quantum numbers for up to J = 4 and L = 3 were tried. Our result shows that a good fit was obtained with three waves, apart from backgrounds, all characterized by the same quantum numbers I('G) = O('+) and J('PC) = 2('++), each well described by a coupled set of Breit-Wigner resonances. The three partial waves include one S-wave with S = 2, two D-waves with S = 0 and S = 2 respectively. The resonance parameters for each state were extracted from a 3-pole K-matrix fit. The coherent background with J('PC) = 1('--) is needed to account for the cos(alpha) distribution where (alpha) is the kaon's azimuthal angle measured in the (phi) rest frame (see Fig. 2.3).;An unexpected observation in the reaction A.1 is that this is an OZI (Okubo-Zweig-Iizuka) suppressed channel in which OZI suppression is found to be absent. This distinctive feature is clearly seen by an excess of (phi)(phi) events above the number expected for uncorrelated production of two (phi) mesons. If the mechanism for OZI violation involves gluon exchange the gluonium states (or glueballs) may manifest themselves in the (phi)(phi) mass spectrum. Assuming both QCD is the correct strong interaction theory and OZI rule is universal in the absence of glueballs, one is led to interpret the breakdown of the OZI suppression is due to the intervention of glueballs. It turns out that one or more primary glueballs with I('G)J('PC) = O('+)2('++) are responsible for the observed three states. Therefore, (pi)('-)p (--->) (phi)(phi)n provides direct evidence for the existence of glueballs.
-
Type
-
dissertation
-
Source
-
PQT Legacy CUNY.xlsx
-
degree
-
Ph.D.
-
Program
-
Physics
