Ph.D. Thesis

Title
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Observation of Diffractive J/Psi Production at the Fermilab Tevatron

A thesis presented to the faculty of The Rockefeller University, 2001
by
Andrei Solodsky

Abstract
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 The first observation of diffractive $\jp(\rightarrow \mu^+\mu^-)$ 
production in $\bar pp$ collisions at $\sqrt{s}$=1.8~TeV is presented
using data collected from the Collider Detector at Fermilab (CDF).
 In a sample of events with two muons of transverse momentum 
$P_T^{\mu}>2$ GeV/$c$ within the pseudorapidity region $|\eta|<$1.0,
the ratio of diffractive to total $\jp$ production rates is found to be 
$R_{\jp}= (1.45\pm 0.25)\%$. 
 Diffractive events are identified by their rapidity gap signature.
 The ratio $R_{\jp}$ is studied as a function of the momentum fraction
$x_{\rm bj}$ of the struck parton in the (anti)proton.
 By combining this measurement with a similar one of diffractive 
dijet production with a leading antiproton, the gluon fraction of 
the (anti)proton diffractive structure is found to be $0.59\pm0.15$.
 These results are compared with reported results for diffractive $W$, 
dijet and $b$-quark production.


Posted to /cdf/pub/thesis/cdf5664_solodsky_thesis.ps
    http://www-cdf.fnal.gov/thesis/cdf5664_solodsky_thesis.ps

Posted by solodsky@cdfsga.fnal.gov