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Observation of Electroweak Single Top-Quark Production with the CDF II Experiment

Description: The standard model of elementary particle physics (SM) predicts, besides the top-quark pair production via the strong interaction, also the electroweak production of single top-quarks [19]. Up to now, the Fermilab Tevatron proton-antiproton-collider is the only place to produce and study top quarks emerging from hadron-hadron-collisions. Top quarks were directly observed in 1995 during the Tevatron Run I at a center-of-mass energy of {radical}s = 1.8 TeV simultaneously by the CDF and D0 Collabo… more
Date: July 1, 2009
Creator: Lueck, Jan & /KARLSRUHE U., EKP
Partner: UNT Libraries Government Documents Department
open access

Studying Z/gamma*+Jet Production

Description: The production of jets in association with a Z/{gamma}* boson is an example of an important class of processes at hadron colliders, namely vector boson + jet (V + jet) production. Comparisons of measurements of this class of processes with theory predictions constitute an important, fundamental test of the Standard Model of particle physics, and of the theory of QCD in particular. While having a smaller cross section than other V +jet processes, Z/{gamma}*({yields} e{sup +}e{sup -}) + jets prod… more
Date: July 1, 2009
Creator: Nilsen, Henrik Wold
Partner: UNT Libraries Government Documents Department
open access

Searches for the Theta_s(1540)+ Strange-Pentaquark Candidate in e+e- Annihilation, Hadroproduction and Electroproduction with the BaBar Detector

Description: Since early in 2003, several experiments have presented evidence for the existence of a positive strangeness baryon state of mass around 1540 MeV/c{sup 2} and width <8 MeV, the {Theta}(1540), which decays to K{sup +}n and K{sup 0}p. Such a state has minimum quark content udud{bar s} and consequently has been interpreted as the S = +1 member of the anti-decuplet of pentaquark states proposed by Diakonov et al. Subsequently, the NA49 experiment presented evidence for the S = -2 member of the a… more
Date: July 29, 2009
Creator: Coleman, Jonathan P.
Partner: UNT Libraries Government Documents Department
open access

Measurement of the double differential diject mass cross section in pp(bar) collisions at sqrt(s) = 1.96 TeV

Description: This thesis presents the analysis of the double differential dijet mass cross section, measured at the D0 detector in Batavia, IL, using p{bar p} collisions at a center of mass energy of {radical}s = 1.96 TeV. The dijet mass was calculated using the two highest p{sub T} jets in the event, with approximately 0.7 fb{sup -1} of data collected between 2004 and 2005. The analysis was presented in bins of dijet mass (M{sub JJ}) and rapidity (y), and extends the measurement farther in M{sub JJ} and y … more
Date: July 1, 2009
Creator: Rominsky, Mandy Kathleen
Partner: UNT Libraries Government Documents Department
open access

Two Complementary Strategies for New Physics Searches at Lepton Colliders

Description: In this thesis I present two complementary strategies for probing beyond-the-Standard Model physics using data collected in e{sup +}e{sup -} collisions at lepton colliders. One strategy involves searching for effects at low energy mediated by new particles at the TeV mass scale, at which new physics is expected to manifest. Several new physics scenarios, including Supersymmetry and models with leptoquarks or compositeness, may lead to observable rates for charged lepton-flavor violating process… more
Date: July 6, 2009
Creator: Hooberman, Benjamin Henry
Partner: UNT Libraries Government Documents Department
open access

Detection of Actinides via Nuclear Isomer De-Excitation

Description: This dissertation discusses a data collection experiment within the Actinide Isomer Identification project (AID). The AID project is the investigation of an active interrogation technique that utilizes nuclear isomer production, with the goal of assisting in the interdiction of illicit nuclear materials. In an attempt to find and characterize isomers belonging to 235U and its fission fragments, a 232Th target was bombarded with a monoenergetic 6Li ion beam, operating at 45 MeV.
Date: July 22, 2009
Creator: Francy, Christopher J.
Partner: UNT Libraries Government Documents Department
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