Dear Collaborators,

I am posting my PhD thesis in the CDF Note database. 
The title is ``Observation of Diffractive Bottom Quark 
Production in 1.8-TeV Proton-Antiproton Collisions''.

The Abstract reads as follows:

The bottom quark production in the single diffractive dissociation is 
first observed in $p\bar{p}$ collisions at $\sqrt{s}$=1.8 TeV using the 
Collider Detector at Fermilab. 
The absence of an energy flow in the forward rapidity region (`rapidity gap') 
is used as an evidence of the single diffraction. 
The high-$p_T$ electron in the $E_T$ range of 9.5 $<E_T^{ele}<$ 20 GeV 
and the central rapidity region ($|\eta|<$1.1) are used to identify the 
bottom quark decay. 
The ratio of the diffractive to the non-diffractive bottom quark production 
is obtained using the model dependent acceptance of the rapidity gap signal 
for the four kinds of the pomeron model.
The ratio $R_{b\bar{b}}$ is measured to be; \\
\[
R_{b\bar{b}}(\xi<0.1;\FG) = 0.62\pm0.19(stat)\pm0.14(syst)\%
\]
for the flat-gluon pomeron model,
\[
R_{b\bar{b}}(\xi<0.1;\FQ) = 0.93\pm0.29(stat)\pm0.22(syst)\%
\]
for the flat-quark pomeron model,
\[
R_{b\bar{b}}(\xi<0.1;\HG) = 0.71\pm0.22(stat)\pm0.16(syst)\%
\]
for the hard-gluon pomeron model,
\[
R_{b\bar{b}}(\xi<0.1;\HQ) = 1.18\pm0.36(stat)\pm0.27(syst)\%
\]
for the hard-quark pomeron model.

This measured ratio is compared with the results of the diffractive 
$W$ and the diffractive dijet productions. 
The ratios measured in these three processes are 
consistent with each other and significantly lower than the theoretical 
prediction. 

                             Best Regards,
                             Hirofumi Ikeda
                             University of Tsukuba


Posted to /cdf/pub/thesis/cdf4872_diffractive_b_thesis.ps
    http://www-cdf.fnal.gov/thesis/cdf4872_diffractive_b_thesis.ps

Posted by ikeda@cdfsga