Source: Dissertation Abstracts International, Volume: 41-07, Section: B, page: 2654. / Thesis (Ph.D.)--The Florida State University, 1980.

This thesis presents a measurement of the inclusive cross-section for prompt photon production as a function of the invariant mass of the photon and highest energy jet in the final state. The experimental cross section is compared with a next-to-leading logarithm Quantum Chromodynamics (QCD) theoretical calculation. Also presented is a mass-fitting analysis in which the photon-jet invariant mass distribution is examined for evidence of excited quark production and decay, a signature of quark compositeness. No evidence of excited quark production was found. An upper limit on the excited quark cross section was established. This upper limit was compared with a theoretical prediction to set a lower limit on the mass of excited quarks of 531 GeV/$c\sp2,$ according to the assumptions of the model. / Source: Dissertation Abstracts International, Volume: 57-01, Section: B, page: 0420. / Major Professor: Horst Wahl. / Thesis (Ph.D.)--The Florida State University, 1995.

The results of an amplitude analysis to determine the spin-parity components of the $K\sp+{\bar K\sp0} \pi\sp{-}$ system produced in the reaction ${\bar p}p\to K\sp+{\bar K\sp0}\pi\sp-$ + X at 8 GeV/c are presented. This experiment has better particle identification than the previously reported results examining this reaction. A total of 3595 events was collected in the mass range 1.24-1.56 GeV/c$\sp2$. The data were collected at the Brookhaven National Laboratory Multi-Particle Spectrometer. Two peaks are observed in the $K\sp+{\bar K\sp0}\pi\sp-$ mass spectrum, one at (1279 $\pm$ 2) MeV/c$\sp2$ with a width of 21 $\pm$ 2) MeV/c$\sp2$, and one at (1417 $\pm$ 3) MeV/c$\sp2$ with a width of (62 $\pm$ 5) MeV/c$\sp2$. / There is evidence for two resonances around 1.3 GeV/c$\sp2$. The $J\sp{PG}$ = 1$\sp{++}$ resonance that peaks near 1.27 Gev/c$\sp2$ is identified with the $f\sb1$(1285). The $J\sp{PG}$ = 0$\sp{-+}$ resonance observed at the same mass is identified with the $\eta$(1280). / In the 1.4 GeV/c$\sp2$ range, the data are consistant with the presence of at least one $J\sp{PG}$ = 0$\sp{-+}$ resonance that peaks near 1.43 GeV/c$\sp2$. This resonance decays only to $a\sb{0}\pi$. There is also evidence for a 1$\sp{++}K\sp{\*}K$ resonance that peaks around 1.40 GeV/c$\sp2$. These results are in agreement with the results from the partial wave analysis performed by members of this collaboration on the $K\sp+{\bar K\sp0}\pi\sp-$ system produced in the reaction $\pi\sp-p\to K\sp+{\bar K\sp0}\pi\sp-n$ at 8 GeV/c. / This experiment also examined the reactions ${\bar p}p\to{\bar \Lambda}p+\pi s+X$ in a search for the U(3100). No evidence for the U(3100) is observed. / Source: Dissertation Abstracts International, Volume: 51-09, Section: B, page: 4405. / Major Professor: Vasken Hagopian. / Thesis (Ph.D.)--The Florida State University, 1990.

K$\sp- p$ interactions at 8 GeV/c have been produced at Brookhaven National Laboratory's Multi-Particle Spectrometer to study the final state $K\sp+{\bar K\sp0}\pi\sp-$ in the mass range 1-2 GeV/c$\sp2$. A total of 1711 events have been produced in the reaction $K\sp- p\to(K\sp+{\bar K\sp0}\pi\sp-$) + Y where Y is a neutral baryon with strangeness $-$1. The Y's identified include the $\Lambda$(1115), $\Sigma$(1192), $\Sigma$(1385), and $\Lambda$(1530). / We see no clear signals for the resonances D(1285), E(1420), and $D\sp\prime$(1520). Upper limits for the production cross sections of these mesons are computed. Through comparison with data obtained in the reaction $\pi\sp- p\to$($K\sp+{\bar K\sp0}\pi\sp-$) + n we find that the production cross sections for the D(1285) and E(1420) are at least an order of magnitude smaller for the $K\sp{-}p$ interactions than for the $\pi\sp{-}p$ interactions, while that of the $D\sp\prime$(1530) may be of the same order of magnitude for both interactions, indicating the possibility of a significant $s{\bar s}$ component. / Also, a Partial Wave Analysis shows some evidence of an interference of 1$\sp{++}$ and 1$\sp{+-} J\sp{PG}$ states near 1.4 GeV/c$\sp2$. The 1$\sp{+-}$ wave appears to be the strongest in this mass region. / Source: Dissertation Abstracts International, Volume: 51-09, Section: B, page: 4405. / Major Professor: Vasken Hagopian. / Thesis (Ph.D.)--The Florida State University, 1990.

The average fraction ($\equiv\langle{\cal Z}\rangle$) of jet momentum carried by the associated charged leading hadron has been determined in the reaction $p$ + $N\ \to\ h\sb1$ + $h\sb2$ + $X$ where $h\sb1$ and $h\sb2$ were two high P$\sb\bot$ hadrons, leading particles of two jets produced at high P$\sb\bot$. A 800 GeV/c proton beam and four nuclear targets: beryllium, aluminium, iron and tungsten were used. The data were taken at the Fermi National Accelerator Laboratory from November 1987-February 1988. / The detector was a double arm magnetic spectrometer, with two sampling calorimeters for real-time event selection and was capable of operating at a high interaction rate ($\approx$2.5 $\times$ 10$\sp6$ interactions per second). / $\langle{\cal Z}\rangle$, connected to the fragmentation process of the scattered partons in the QCD-parton model, has been determined as a function of the transverse momentum of the leading hadron and the cosine of the scattering angle of the leading hadron pair in the di-hadron C.o.M. system, for positive, negative and both sign charges of the leading hadron and for each target. / The fragmentation process was found to be independent of nuclear effects and the amount of nuclear matter crossed by the fragmenting parton. The $\langle{\cal Z}\rangle$ distributions agree with the QCD-parton model predictions for single independent parton-parton scattering and independent fragmentation process. / Agreement has also been found between these data and previous published ones obtained in a $pp$ collider experiment confirming the independence of the fragmentation process from nuclear effects in high P$\sb\bot$ interactions. / Source: Dissertation Abstracts International, Volume: 51-04, Section: B, page: 1882. / Major Professor: David A. Levinthal. / Thesis (Ph.D.)--The Florida State University, 1990.

We present a technique for using a Monte Carlo method to perform the phase space integrations used in calculating the next-to-leading-logarithm, QCD contribution to symmetric dihadron production. We show that this method is relatively simple, straightforward, and sufficiently flexible so as to be applicable to a broad range of next-to-leading-log calculations. / Source: Dissertation Abstracts International, Volume: 50-03, Section: B, page: 0998. / Major Professor: Joseph F. Owens. / Thesis (Ph.D.)--The Florida State University, 1989.

We investigate the use of a random or stochastic process to perform Monte Carlo simulations of improved actions for pure SU(2) gauge theory formulated on a lattice. The improved actions studied are extensions of Wilson's simple plaquette action to include six-link plaquettes. The stochastic or "noisy" method involves computing additional terms in the action such that they have the correct values on the average. We devise two schemes for achieving this and compare them to the Metropolis method, where the additional terms are computed exactly. We find that the noisy methods produce independent configurations more rapidly than the Metropolis method. The greatest improvement is found to be by roughly a factor of two. The results, however, are sensitive to the values of the coefficients of the additional terms in the action. Our study indicates that for more complex actions a noisy method will be significantly superior to an exact method such as the Metropolis algorithm. This means that current lattice sizes and computer resources can be used to measure observables much closer to the continuum limit. / Source: Dissertation Abstracts International, Volume: 50-03, Section: B, page: 0998. / Major Professor: Joseph F. Owens. / Thesis (Ph.D.)--The Florida State University, 1989.

The production of massive hadron pairs has been studied in the reaction $p + N \to h\sb1 + h\sb2 + X$ using a proton beam at 800 GeV/c and four nuclear targets: beryllium, aluminum, iron, and tungsten. The data were taken at the Fermi National Accelerator Laboratory from November 1987-February 1988. / The detector was a double arm magnetic spectrometer, with a sampling calorimeter for real-time event selection. It was capable of operating at a high interaction rate ($\approx$2.5 $\times$ 10$\sp6$ interactions per second) and accepted +$-$, ++, and $--$ hadron pair charge states. / The mass dependence of the differential cross section for hadron pair production was determined over a mass range, 6.0 GeV/c$\sp2 \leq M \leq 15.0$ GeV/c$\sp2$, for the four targets and three charge states and was shown to agree well with QCD calculations. / The dependence of the cross section on the atomic weight of the target was shown to be accurately described by the form $\sigma(A) \propto A\sp\alpha$. The values of $\alpha$ were determined as a function of mass and charge state and were found to have an average value $\alpha$ = 1.043 $\pm$ 0.011(stat.) $\pm$ 0.025(syst.) when the transverse momentum of the pair, $P\sb{T}$, was $\leq$1.0 GeV/c and $\alpha$ = 1.049 $\pm$ 0.007(stat.) $\pm$ 0.025(syst.) for $P\sb{T} \leq 2.0$ GeV/c. No significant variation over the range of mass or charge state was observed. The values of $\alpha$ determined by this experiment agree well with previously published results of $\alpha$ for unlike-sign charged hadron pairs and are consistent with the parton multiple scattering model of atomic weight dependence. We have extended the knowledge of the atomic weight dependence of hadron pair production to measurements of $\alpha$ for different charge states, a higher mass region, and with better statistical accuracy. / Source: Dissertation Abstracts International, Volume: 50-03, Section: B, page: 1000. / Major Professor: David A. Levinthal. / Thesis (Ph.D.)--The Florida State University, 1989.

Using a small volume expansion the mass spectrum and deconfining temperature of SU(2) and SU(3) gauge theory are evaluated. Including non-perturbative features by restoring symmetries which were broken in perturbation theory we obtain results which are valid up to intermediate volumes. The mass spectrum obtained is in good agreement with Luscher's small volume expansion in the small-volume limit and with Monte Carlo Data in medium sized volumes. Using asymmetric volumes we are able to derive the deconfining temperature and find a reasonable agreement with Monte Carlo calculations. / Source: Dissertation Abstracts International, Volume: 51-01, Section: B, page: 0257. / Major Professor: Bernd A. Berg. / Thesis (Ph.D.)--The Florida State University, 1989.

Supersymmetry (SUSY) has been known as a beautiful solution to the fine tuning problem of the Standard Model but so far there is no direct experimental evidence of its existence. However, the coming decade could be the decade of SUSY due to the ongoing project of the CERN Large Hadron Collider (LHC). Several SUSY signals for the LHC have been studied; the potential for a thorough SUSY search has been demonstrated. By looking at multi-jet plus $E\sb{T}$ events, $m\sb{\tilde g} \sim$ 1300 (2000) GeV can be explored if $m\sb{\tilde q} \gg m\sb{\tilde g}$ $(m\sb{\tilde q} \simeq m\sb{\tilde g});$ jet multiplicity will yield information on whether squark production makes a significant contribution; reconstructing hemisphere masses may yield a measure of $m\sb{\tilde g}$ to 15-25%. For the trilepton signal, a set of cuts was developed to isolate $\tilde\chi\sbsp{1}{\pm}\tilde\chi\sbsp{2}{0}$ events; as long as the spoiler modes (i.e. $\tilde\chi\sbsp{2}{0} \to \tilde\chi\sbsp{1}{0}Z$ and $\tilde\chi\sbsp{2}{0}$ $\to \tilde\chi\sbsp{1}{0}H\sb\ell$) are not open and the $\tilde\chi\sbsp{2}{0}\to\tilde\chi\sbsp{1}{0}\ell\bar\ell$ interference effect is not severe, most of the parameter space can be probed. A precise measurement of $m\sb{\tilde\chi\sbsp{2}{0}} \ - m\sb{\tilde\chi\sbsp{1}{0}}$ can be made. For the dilepton signal from slepton production, $m\sb{\tilde\ell\sb{R}} \sbsp{\sim}{<}$ 200-275 GeV ought to be explorable. Physics at the unification scale ($\sim$10$\sp{16}$ GeV) described in the supergravity (SUGRA) model can also be tested at the LHC. / Source: Dissertation Abstracts International, Volume: 56-08, Section: B, page: 4381. / Major Professor: Howard A. Baer. / Thesis (Ph.D.)--The Florida State University, 1995.