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CPand t violation in neutrino oscillations

Description: In this short lecture, we discuss some basic phenomenological aspects of CP and T violation in neutrino oscillation. Using CP/T trajectory diagrams in the bi-probability space, we try to sketch out some essential features of the interplay between the effect of CP/T violating phase and that of the matter in neutrino oscillation.
Date: September 18, 2003
Creator: Minakata, Hisakazu; Nunokawa, Hiroshi & Parke, Stephen
Partner: UNT Libraries Government Documents Department

Prospects for mixing and CP violation at the Tevatron

Description: The Fermilab p{bar p} Tevatron collider, operating at {radical}s = 1. 8 TeV, is a proficient source of B hadrons. The first collider run, Run I, has clearly proven that B states can be observed cleanly and can be studied in great detail in a hadron collider environment. In this presentation the future of the study of B{bar B} mixing and of CP violation at the Tevatron, with an upgraded machine and detectors, is discussed.
Date: December 1, 1996
Creator: Rijssenbeek, M. & collaborations, The CDF and DO
Partner: UNT Libraries Government Documents Department

CP violation, mixing and rare decays at the Tevatron now and in Run II

Description: We review the status of current B mixing and CP violation measurements from the Fermilab Tevatron. With the existing data sample, the CDF collaboration has made competitive measurements of B{sub d}{sup 0} mixing; set limits on B{sub s}{sup 0} mixing and has begun a direct search of CP violation in the B system through the decay B{sup 0}/{anti B}{sup 0}{yields}J/{psi}K{sub S}{sup 0}. The prospects for future b measurements at the Tevatron, including CP violation, B{sub s}{sup 0} mixing and rare decay searches are discussed.
Date: December 1, 1998
Creator: Pitts, Kevin T.
Partner: UNT Libraries Government Documents Department

The Measurement of xi'/xi at Fermilab KTeV-E832

Description: The status of the analysis effort for the 25% data sample taken during the Fermilab '96-'97 fixed target run for {epsilon}'/{epsilon} measurement from KTeV is presented here. Detector performance, data statistics, background subtractions, data and monte-carlo comparison for acceptance corrections, as well as the preliminary results on K{sub L}{yields}{pi}{sup 0}{gamma}{gamma} are described in more detail. Prospects for KTeV 99, in the up coming 6 months '99 fixed target run, are also discussed here.
Date: February 15, 1999
Creator: Hsiung, Yee Bob
Partner: UNT Libraries Government Documents Department

CP violation in neutral kaon decays

Description: A brief review of the theoretical status of CP violation in decays of neutral kaons is presented. We focus on three important topics: {epsilon}, {epsilon}`/{epsilon} and K{sub L}{yields}{pi}{sup 0}{nu}{anti {nu}}.
Date: May 1, 1997
Creator: Buchalla, G.
Partner: UNT Libraries Government Documents Department

Status of the KTeV experiment at Fermilab

Description: The KTeV experiment is a fixed target experiment at Fermilab. Its primary goal is the search for direct CP violation in the decay of neutral kaons. Its current status and some preliminary results will be discussed.
Date: October 1, 1997
Creator: Ben-David, R. & Collaboration, KTeV
Partner: UNT Libraries Government Documents Department

Flavor and CP violations from sleptons at the Muon Collider

Description: Supersymmetric theories generally have new flavor and CP violation sources in the squark and slepton mass matrices. They will contribute to the lepton flavor violation processes, such as {mu}{yields}e{gamma}, which can be probed far below the current bound with an intense muon source at the front end of the muon collider. In addition, if sleptons can be produced at the muon collider, the flavor violation can occur at their production and decay, allowing us to probe the flavor mixing structure directly. Asymmetry between numbers of {mu}{sup +}e{sup -} and e{sup +}{mu}{sup -} events will be a sign for CP violation in supersymmetric flavor mixing.
Date: December 1, 1997
Creator: Cheng, H.-C.
Partner: UNT Libraries Government Documents Department

Prospects for cp violation searches at Tevatron

Description: In the near future CP violation measurements will be one of the most crucial test for the Standard Model. Several B factories are going to be built to study these phenomena in the B system. These goals can be achieved also at the Tevatron Collider by the two experiments: CDF and D0. Starting from data collected during Run I the sensitivity expected in Run II is shown.
Date: September 1, 1997
Creator: Lucchesi, D.
Partner: UNT Libraries Government Documents Department

CP-Violating solitons in the early universe

Description: Solitons in extensions of the Standard Model can serve as localized sources of CP violation. Depending on their stability properties, they may serve either to create or to deplete the baryon asymmetry. The conditions for existence of a particular soliton candidate, the membrane solution of the two-Higgs model, are presented. In the generic case, investigated by Bachas and Tomaras, membranes exist and are metastable for a wide range of parameters. For the more viable supersymmetric case, it is shown that the present-day existence of CP-violating membranes is experimentally excluded, but preliminary studies suggest that they may have existed in the early universe soon after the electroweak phase transition, with important consequences for the baryon asymmetry of the universe.
Date: July 1, 1997
Creator: Tornkvist, O. & Riotto, A.
Partner: UNT Libraries Government Documents Department

The pooltable analogy to axion physics

Description: An imaginary character named TSP finds himself in a playroom whose floor is tilted to one side. However, the pooltable in the playroom is horizontal. TSP wonders how this can be. In doing so, he embarks upon an intellectual journey which parallels that which has been travelled during the past two decades by physicists interested in the Strong CP Problem and axion physics.
Date: January 1, 1996
Creator: Sikivie, P.
Partner: UNT Libraries Government Documents Department

Measurement of the cp asymmetry Parameter sin(2{beta}) at CDF

Description: We present a measurement of the time-dependent asymmetry in the rate for {anti }B{sup 0}{sub d} versus B{sup 0}{sub d} decays to J/{psi} K{sup 0}{sub S} . In the context of the Standard Model this is interpreted as a measurement of the CP-violation parameter sin(2{beta}). A total of 198 {+-} 17 B{sup 0}{sub d}/{anti B}{sup 0}{sub d} decays were observed in p{anti p} collisions at ps = 1:8 TeV by the CDF detector at the Fermilab Tevatron. The initial b-flavor is determined by a same side avor tagging technique. Our analysis results in sin(2{beta}) = 1:8 {+-} 1:1(stat) {+-} 0:3(syst).
Date: October 1, 1998
Creator: LeCompte, T. J.
Partner: UNT Libraries Government Documents Department

B Decays as a probe of spontaneous cp-violation in SUSY models

Description: We consider phenomenological implications of susy models with spontaneously broken CP-symmetry. In particular, we analyze CP-asymmetries in B decays and find that the predictions of these models are vastly different from those of the SM. These features are common to NMSSM-like models with an arbitrary number of sterile superfields and the MSSM with broken R-parity.
Date: July 8, 1999
Creator: Lebedev, Oleg
Partner: UNT Libraries Government Documents Department

B {0 over d} mixing and CP violation measurements at the Tevatron

Description: We present six time-dependent B<sup>0</sup><sub>d</sub> mixing measurements of {Delta}m<sub>d</sub> from the CDF Run I data. The CDF average is {Delta}m<sub>d</sub> = .494<sup>&plusmn;.026</sup><sub>&plusmn;.026</sub>(ps)<sup>-1</sup>. We also present a measurement of the CP-violating asymmetry sin(2{beta}) using a sample of B<sup>0</sup>/{anti B}<sup>0</sup> {yields} J/{psi} K<sup>0</sup><sub>s</sub> decays and report sin(2{beta}) = .79 <sup>+41</sup><sub>-.44</sub>.
Date: July 27, 1999
Creator: Byrum, K.
Partner: UNT Libraries Government Documents Department

Rare kaon decays

Description: The phenomenology of rare kaon decays is reviewed, with emphasis on tests of standard model flavordynamics.
Date: January 1, 1997
Creator: Buchalla, G.
Partner: UNT Libraries Government Documents Department


Description: To study CP violation, the HEM-B experiment uses an internal wire target in the transverse halo of the stored HERA proton beam. Operational experience shows that the resulting interaction rates are extremely sensitive to tiny orbit jitter amplitudes. Various methods have been studied to stabilize these interaction rates by increasing diffusion in the transverse proton beam tails without affecting the luminosity at the electron-proton collider experiments ZEUS and H1. Tune modulation was found to be a promising method for this task. Experiments performed in recent years will be reported.
Date: May 19, 2003
Creator: MONTAG,C.
Partner: UNT Libraries Government Documents Department

Lifetime difference of B{sub s} mesons and its implications

Description: The authors discuss the calculation of the width difference {Delta}{Gamma}{sub B}, between the B{sub s} mass eigenstates to next-to-leading order in the heavy quark expansion. 1/m{sub b}-corrections are estimated to reduce the leading order result by typically 30%. The error of the present estimate ({Delta}{Gamma}/{Gamma}){sub B{sub s}} = 0.16{sub {minus}0.09}{sup +0.11} could be substantially improved by pinning down the value of <{anti B}{sub s}{vert_bar}({anti b}{sub i}s{sub i}){sub S{minus}P}({anti b}{sub j}s{sub j}){sub S{minus}P}{vert_bar}B{sub s}> and an accuracy of 10% in ({Delta}{Gamma}/{Gamma}){sub B{sub s}} should eventually be reached. They briefly mention strategies to measure ({Delta}{Gamma}/{Gamma}){sub B{sub s}}, and its implications for constraints on {Delta}M{sub B{sub s}}, CKM parameters and the observation of CP violation in untagged B{sub s} samples.
Date: August 1, 1996
Creator: Beneke, M.
Partner: UNT Libraries Government Documents Department

Search for new mechanism of CP violation through tau decay and semileptonic decay at hadrons

Description: If CP is violated in any decay process involving leptons it will signify the existence of a new force (called the X boson) responsible for CP violation that may be the key to understanding matter-antimatter asymmetry in the universe. The author discusses the signatures of CP violation in (1) the decay of tau lepton, and (2) the semileptonic decay of {pi}, K, D, B and t particles by measuring the polarization of the charged lepton in the decay. The author discusses how the coupling constants and their phases of the coupling of the X boson to 9 quark vertices and 3 lepton vertices can be obtained through 12 decay processes.
Date: November 1, 1996
Creator: Tsai, Yung Su
Partner: UNT Libraries Government Documents Department

Status of BTeV: A dedicated b physics experiment at the Fermilab Tevatron Collider

Description: BTeV is a program whose long term goal is to carry out precision studies of CP violation, mixing, and raare decays of bottom and charmed quarks in the forward direction at the Fermilab Tevatron Collider. It is planned for the new interaction region, C0, currently being constructed. We describe the technique, physics reach, and status of BTeV.
Date: October 1, 1998
Creator: Butler, Joel N.
Partner: UNT Libraries Government Documents Department

Triggering BTeV

Description: BTeV is a collider experiment at Fermilab designed for precision studies of CP violation and mixing. Unlike most collider experiments, the BTeV detector has a forward geometry that is optimized for the measurement of B and charm decays in a high-rate environment. While the rate of B production gives BTeV an advantage of almost four orders of magnitude over e{sup +} e{sup {minus}} B factories, the BTeV Level 1 trigger must be able to accept data at a rate of 100 Gigabytes per second, reconstruct tracks and vertices, trigger on B events with high efficiency, and reject minimum bias events by a factor of 100:1. An overview of the Level 1 trigger will be presented.
Date: April 16, 1999
Creator: Gottschalk, Erik
Partner: UNT Libraries Government Documents Department

Prospects of measuring CP violation in B decays at CDF

Description: We summarize the prospects of measuring the CP asymmetry in B{sup 0} {r_arrow} J/{psi}K{sup 0}{sub s} and B{sup 0} {r_arrow} {pi}{sup +}{pi}{sub -} with the CDF detector in Run II in 1999. We also explore the feasibility to determine sin 2{gamma} and discuss Run I results relevant to measurement of CP violation at CDF.
Date: September 1, 1996
Creator: Paulini, M.
Partner: UNT Libraries Government Documents Department

From symmetry violation to dynamics: The charm window

Description: C.S. Wu observed parity violation in the low energy process of nuclear decay. She was the first to observe this symmetry violation at any energy. Yet, her work taught us about the form and strengths of the couplings of the massive weak boson. Today, we use the same approach. We look for very much higher mass-scale interactions through symmetry violations in the decays of charm quark systems. These charm decays provide a unique window to new physics.
Date: December 1, 1997
Creator: Appel, J.A.
Partner: UNT Libraries Government Documents Department

Flavor tagging nd CP-violation measurements at the Tevatron

Description: The CDF collaboration has adapted several heavy flavor tagging techniques and employed them in analyses of time-dependent flavor asymmetries using data from the Tevatron Run I. The tagging algorithms were calibrated using low-P{sub t} inclusive lepton and dilepton trigger data samples. The tagging techniques were applied to a sample of {approximately} 400 B{sub d}{sup 0}/{anti B}{sub d}{sup 0} {r_arrow} J/{psi}K{sub s}{sup 0} decays and were used to measure the CP violation parameter, sin(2{beta}). Prospects for future improved measurements of the CP violation parameters at the Tevatron are briefly discussed.
Date: April 28, 1999
Creator: Tkaczyk, S.
Partner: UNT Libraries Government Documents Department

The K{sub L} {yields} {pi}{sup 0}{nu}{anti {nu}} decay beyond the Standard Model

Description: The K{sub L} {yields} {pi}{sup 0}{nu}{anti {nu}} decay is analyzed in a model independent way. When lepton flavor is conserved, this decay mode is a manifestation of CP violating interference between mixing and decay. Consequently, a theoretically clean relation between the measured rate and electroweak parameters holds in any given model.
Date: April 1, 1997
Creator: Grossman, Y.
Partner: UNT Libraries Government Documents Department