We present a summary of top quark physics results from Run 1 at CDF using the
Run 1 data sample of 106 pb$^{-1}$. In addition to the precursory measurements
of the top quark mass and $\ttbar$ cross ...section, we have performed a number of
other analyses which test the consistency of the $\ttbar$ data sample with the
standard model (SM). Deviations from SM expectations could provide hints for
new physics. We find that the data are consistent with the SM. While the Run 1
data are statistically limited, we have shown that the systematic uncertainties
are under control and thus have layed the groundwork for higher precision tests
of the SM in Run 2. This report describes the Run 1 top quark analyses and
expectations and prospects for top quark measurements in Run 2.
The physiological controls which mediate the acquisition of food preferences are not well understood. This dissertation research investigated how the gastrointestinal site and delay of carbohydrate ...delivery influence the development of flavor preferences in rats. The conditioned flavor preference procedure was used in all experiments. On alternate training days, rats consumed nonnutritive CS+ and CS$-$ cue flavors which were paired with carbohydrate and water infusions, respectively. On test days, rats were given a choice between the two cue flavors without infusions, and preferences were assessed. In Experiment 1, the preferences conditioned by intragastric (IG) and intraduodenal (ID) glucose infusions were compared in two groups of rats. Strong and comparable flavor preferences were conditioned by IG and ID glucose infusions. Experiment 2A examined whether the actions of glucose in the stomach alone are sufficient to condition flavor preferences. When IG glucose infusions were restricted to the stomach during training by inflation of a pyloric cuff, preferences were not obtained. Preferences were observed in a control group that was able to experience the post-gastric effects of the IG glucose infusions. Experiment 2B demonstrated that pyloric cuff inflation during conditioning does not prevent conditioning when the delayed post-gastric effects of the glucose were permitted following each conditioning session. If preferences are mediated by post-gastric effects, conditioning must be able to withstand delays. Experiment 3 examined preference conditioning with delays of 2.5, 10, 30 and 60 minutes between cue flavor consumption and IG 8% glucose infusions. The strength of the preferences decreased as the delay interval increased; with a 60 minute delay preferences were not exhibited. To determine whether increasing the magnitude of reinforcement promotes conditioning with a 60 minute delay, Experiment 4 compared the preferences conditioned by IG infusions of 8% and 16% Polycose. Preferences were conditioned by both concentrations of Polycose, although, 16% Polycose tended to condition stronger and more reliable preferences. Taken together, the findings suggest that preference conditioning is mediated by the post-gastric actions of carbohydrates which may occur following a delay. Possible mechanisms for long-delay learning and communication between gut and brain were discussed.
This thesis presents the results from an investigation of the production of charmed mesons at high transverse momentum in collisions of 515 GeV/c negative pions with copper and beryllium targets. The ...data were taken during the 1990 fixed target run at Fermilab using the E706 spectrometer. The E706 detector consisted of a high precision charged tracking system and a finely segmented liquid argon calorimeter. The tracking system was used to reconstruct the charged particles in the event, as well as the associated vertices. The electromagnetic section of the calorimeter (EMLAC) provided precise measurements of the position and energy of the photons, as well as forming the basis for the high p$\sb{\rm T}$ trigger. Events which produced localized high p$\sb{\rm T}$ showers in the EMLAC were selected by the trigger and written to tape. The events which were recorded are enriched with direct photons and high p$\sb{\rm T}$ jets. From the 1990 data, a sample of $\sim$150 charmed hadrons have been fully reconstructed via their displaced vertices. Due to the high p$\sb{\rm T}$ trigger, these charm particles are also at high transverse momentum. The intent of this thesis is to present a measurement of the differential cross section of charmed particles in the p$\sb{\rm T}$ range from 1-8 GeV/c. By extrapolating below 1 GeV/c, we also present a measurement of the total inclusive D$\sp\pm$ production cross section. These results are compared with the NLO theoretical calculations, as well as with the predictions from the Pythia Monte Carlo.
We present measurements of the branching fractions of the decays, D-->K^0_{S,L}pi. The measured asymmetry shows that B(D^0--> K^0_S pi^0) is not equal to B(D^0--> K^0_L pi^0), as expected. We also ...find that B(D^+ --> K^0_S pi^+) is statistically compatible with B(D^+ --> K^0_L pi^+). Lastly, we present a recent measurement of the branching fraction of the doubly Cabibbo-suppressed decay, D^+ --> K^+ pi^0.
We present several results on hadronic D meson decays. We report on results from the scan of the energy region from 3970 MeV to 4260 MeV, which was used to determine an optimal energy to carry out ...the D_s physics program of CLEO-c. Improved measurements of inclusive and exclusive D and D_s branching fractions are presented. We also show results on Dalitz analyses of D^+-->pi^+pi^-pi^+ using CLEO-c data and D^0--> K^+K^-pi^0 using CLEO III data.
In this paper, we report on the most recent measurements of the top quark
mass, performed by the CDF and D0 collaborations at the Fermilab Tevatron. The
CDF collaboration has performed measurements ...of the top quark mass in three
decay channels from which the top quark mass is measured to be 175.6 +- 6.8
GeV/c^2. The D0 collaboration combines measurements from two decay channels to
obtain a top quark mass of 172.1 +- 7.1 GeV/c^2. Combining the measurements
from the two experiments, assuming a 2 GeV/c^2 correlated systematic
uncertainty, the measurement of the top quark mass at the Tevatron is 173.9 +-
5.2 GeV/c^2. This report presents the measurements of the top quark mass from
each of the decay channels which contribute to this measurement.
Using data collected using the CLEO III detector, we present recent results on decays of the \(\Upsilon(1S)-\Upsilon(3S)\) resonances. We report on three analyses. They are: (1) improved measurements ...of the muonic branching fraction of the \(\Upsilon(1S)-\Upsilon(3S)\), (2) precision measurements of \(\Upsilon(2S)\) and \(\Upsilon(3S)\) photonic transitions, and (3) new measurements of \(\Upsilon(1S)\) decays to charmonium final states.}
The BTeV experiment is a b-physics experiment designed to conduct precision tests of the CKM description of CP violation and study rare processes involving bottom and charm hadrons. The experiment ...will be located in the C0 interaction region at the Fermilab Tevatron, and is intended to begin data-taking around 2007-2008. One of the most important elements of the BTeV spectrometer is the ring-imaging Cerenkov detector (RICH) which is used for particle identification. In this article we describe the BTeV RICH and present its expected performance.
We present a summary of top quark physics results from Run 1 at CDF using the Run 1 data sample of 106 pb\(^{-1}\). In addition to the precursory measurements of the top quark mass and \(\ttbar\) ...cross section, we have performed a number of other analyses which test the consistency of the \(\ttbar\) data sample with the standard model (SM). Deviations from SM expectations could provide hints for new physics. We find that the data are consistent with the SM. While the Run 1 data are statistically limited, we have shown that the systematic uncertainties are under control and thus have layed the groundwork for higher precision tests of the SM in Run 2. This report describes the Run 1 top quark analyses and expectations and prospects for top quark measurements in Run 2.
In this paper, we report on the most recent measurements of the top quark mass, performed by the CDF and D0 collaborations at the Fermilab Tevatron. The CDF collaboration has performed measurements ...of the top quark mass in three decay channels from which the top quark mass is measured to be 175.6 +- 6.8 GeV/c^2. The D0 collaboration combines measurements from two decay channels to obtain a top quark mass of 172.1 +- 7.1 GeV/c^2. Combining the measurements from the two experiments, assuming a 2 GeV/c^2 correlated systematic uncertainty, the measurement of the top quark mass at the Tevatron is 173.9 +- 5.2 GeV/c^2. This report presents the measurements of the top quark mass from each of the decay channels which contribute to this measurement.
