Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 23 for “"B mesons"”.
-
Lattice QCD determination of weak decays of B mesons
This thesis uses a variety of numerical and statistical techniques to perform high precision calculations in high energy physics using quantum field theory. It introduces the experimental motivation for the calculation of B meson form factors and includes a discussion of previous work. It then …
-
Analysis of Excited B Mesons with the OPAL Detector at LEP
… than 570,000 inclusively reconstructed <br>B mesons is selected making use of improved tagging and reconstruction methods. B* mesons are reconstructed using the decay <br>B* -> B gamma. About 9,000 reconstructed B* candidates using photon conversions and more than 64,000 B* candidates using …
-
Precision Measurement of the Mass Difference of Neutral and Charged B Mesons
… of the mass difference of neutral and charged B mesons, m(B0) - m(B+). The measurement is based on a data sample of about 232 million B-meson pairs recorded with the BABAR detector at the e+e- storage-ring system PEP-II. In events of e+e- --> Upsilon(4S) --> B Bbar, B0 and B+ mesons are …
-
Electron Identification and Measurement of the Inclusive Semileptonic Branching Fraction of B Mesons at the BABAR Experiment
… von einem semileptonischen Zerfall des zweiten B-Mesons werden durch die relative Ladung und Impulsrichtung zum hochenergetischen Elektron vom Untergrund aus semileptonischen Charm Zerfällen isoliert. Das inklusive Verzweigungsverhältnis für den semileptonischen Zerfall des B-Mesons wird zu (10.85 …
-
Fluctuating Open Heavy Flavour Energy Loss in a Strongly Coupled Plasma with Observables from RHIC and the LHC
… (using the nuclear modification factor) of B-mesons using AdS/CFT techniques assuming a strongly coupled quark-gluon plasma (QGP). These energy loss predictions are presented for collision energies √ sNN = 2.76 TeV for central collisions and √ sNN = 5.5 TeV for various centrality classes. …
-
Using Heavy Flavors To Study New Physics
… photon contributions to a di-lepton decay of B-mesons as well as two-particle hadronic unitary contributions to the rare di-leptonic decay of the neutral D meson. Additionally, constraints are calculated for two super-WIMP dark matter models from rare heavy flavor decays.</p>
-
Analysis of B Meson Decays to Three Charged Pions
Decays of B mesons to three-body charmless final states probe the properties of the weak interaction through their dependence on the complex quark couplings in the CKM matrix. They also test dynamical models for hadronic B decays. Based on a sample of 772 million BB pairs collected by the Belle …
-
Measurement of the ratio of branching fractions Br(B⁰s̳ [right arrow] D⁻s̳[pi]⁺)/Br(B⁰ [right arrow] D⁻[pi]⁺) at CEF-11
… depends on the number of reconstructed B⁰ mesons. We present the measurement of the ratio of branching fractions Br ... , which directly influences the number of B⁰s events available for the measurement of B⁰s mixing at CDF-II. We analyze 115 pb-l of data collected with the CDF-II detector …
-
Hidden Sector: Three Different Ways
… such Hidden Sector may alter rare decays of B mesons
-
A measurement of B⁰ anti-B⁰ oscillations using fully-reconstructed hadronic B decays at BaBar
Flavor oscillations of neutral B mesons have been studied with e+e- annihilation data collected at center of mass energies near the [gamma](4S) at the PEP-II asymmetric collider with the BABAR detector. One B⁰ is fully reconstructed in a hadronic decay to a flavor eigenstate. The flavor of the …
-
Bound states of heavy and light quarks in the framework of quantum chromodynamics
The spectra of the D, F, B and E mesons have been calculated using the MIT bag model together with a static potential related to the Fourier transform of the "dressed" gluon propagator. The heavy quark has been assumed to coincide with the centre of the bag, while the Light antiquark was treated …
-
Measurement of bar{B0} Meson Properties Via Partial Reconstruction of the Decay bar{B0} -> D*+ l- ar{nu}
… Electron Storage Ring, several properties of B mesons are measured using a partially reconstructed tag of the decay mode bar{B0} -> D*+ l- bar{nu}. Using 2.38 fb**{-1} of on-resonance data and the averaged B meson semileptonic branching fraction through inclusive lepton momentum spectrum …
-
Group theory predictions for B --> M₁M₂M₃
The study of B meson decays to 3 pseudoscalar mesons MMM provides a promising arena for constraining CP violation from the Standard Model and searching for "new physics". In this thesis we derive decay amplitudes, rates, and CP asymmetries for B mesons decaying to MMM, in the limit of SU(2) isospin …
-
Analysis of B [sigma] flavor oscillations at CDF
… The analysis is extended to samples of B+ and Bo mesons, which are further used for algorithm calibration and method validation. The B mesons lifetimes are extracted. The measurement of the Bo oscillation frequency yields Amd = 0.522 ± 0.017 ps-1. The search for B, oscillations is performed using …
-
Measurement of the Ratio of Charged and Neutral 𝐵 Mesons in Υ (4𝑆) Events via Partial Reconstruction of the Semileptonic Decays 𝛣̅⁰⟶𝐷<sup>∗</sup>⁺ℓ⁻<sub>𝜈̅ℓ</sub> and 𝛣̅⁻⟶𝐷<sup>∗</sup>⁰ℓ<sub>𝜈̅ℓ</sub>
… fraction and lifetime for charged and neutral B mesons, <img width=31 height=29 align=center src=https://vtechworks.lib.vt.edu/bitstream/handle/10919/28846/image012.gif>. It is combined with measurements of the lifetime ratio to obtain the ratio of charged and neutral B meson production at the …
-
Measurement of the Partial Branching Fraction for Inclusive Semileptonic B Meson Decays to Light Hadrons B->Xu l nu and an Improved Determination of the Quark-Mixing Matrix Element |V_ub|
… is deduced from the decay products of both B mesons. The final hadronic state,$ X_u$, consists of a sum of many hadronic channels, each of which contains at least one $u$ quark. The variables $q^2$ and $E_e$ are then combined to compute the maximum kinematically allowed invariant mass squared …
-
The readout system of the HERA-B Inner Tracker and prospects of HERA-B in the field of Drell-Yan physics
… measure CP violation in the system of neutral B mesons. One sub-detector is the Inner Tracker, which is built of Micro-Strip Gas Chambers with Gas Electron Multiplier (GEM-MSGC) with about 120,000 readout channels. Using results of test beam experiments, the readout system of the Inner Tracker …
-
Studies of rare B-meson decays to muons at the LHCb experiment
In this dissertation, very rare decays of B-mesons to purely muonic final states, both dimuon and four-muon, are studied at the LHCb experiment using data recorded during the first and second data-taking periods of the Large Hadron Collider, spanning the years 2011–2012 and 2015–2018, respectively. …
-
Analoge Auslese- und Triggerelektronik für Mikrostreifen-Gaszähler
… of the CP symmetry in the system of neutral B mesons. The ``Physikalisches Institut der Universität Heidelberg'' is contributing the development of the inner tracking system. The inner tracking detector will consist of micro strip gas chambers (MSGC) with custom made readout electronics. These …
Page 1 of 2