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 48 for “"Heavy quark"”.
-
Aspects of Nonperturbative Heavy Quark Physics
The properties of charm and bottom quarks are an interesting corner of Quantum Chromo-Dynamics (QCD) due to the fact that their masses are much heavier than the typical QCD interaction energy ΛQCD. Due to this scale separation, it is possible to describe these heavy quarks by Effective Field …
-
Higgs Effects in Neutrino Physics and Heavy Quark Systems
… on the properties of neutrino sector and heavy quark systems. The phenomenological implications of multi-Higgs models, which contain multi-Higgs doublets, in the neutrino and quark sector are discussed in this dissertation. The two-Higgs-doublet model (2HDM), in which two Higgs doublets …
-
Heavy quark symmetry in the soft collinear effective theory
… with the light meson allowing us to derive heavy quark symmetry relations between the ... type amplitudes. A new mechanism for the generation of non-perturbative strong phases is shown within the framework of factorization. Heavy quark symmetry relations are shown to apply for these strong …
-
Heavy quark physics on the lattice with improved nonrelativistic actions
Hadrons containing heavy quarks, in particular b quarks, play an important role in high energy physics. Measurements of their electroweak interactions are used to test the Standard Model and search for new physics. For the comparison of experimental results with theoretical predictions, …
-
Third-order QCD corrections to heavy quark pair production near threshold
The measurement of the top quark mass is an important task at the future International Linear Collider. The most promising process is the top quark pair production in the threshold region. In this region the top quarks behave non-relativistically and a perturbative treatment using effective field …
-
Heavy Quark Jet Rest Frame Identification Technique and Incoherent Phi Analysis AT ALICE
… which substantially reduces the number of non-heavy flavor jets in a jet sample. Coherently produced Phi mesons are not observed at ALICE while incoherently produced Phi mesons are observed with a cross section in the range between 1900 and 30600 μbarns in 2011 Pb-Pb collision data collected …
-
The interactions of hadrons containing a heavy quark in the strong coupling limit of lattice QCD
… are pinned in place on the lattice by infinitely heavy quarks. The potentials are calculated to leading order in the strong coupling and hopping parameter expansions for the following six systems: meson/meson, baryon/antimeson, baryon/baryon, meson/antimeson, baryon/meson and baryon/antibaryon. …
-
Heavy quark interaction in Hot QCD matter: open charm and bottom production in relativistic Heavy-Ion Collisions
… Model. The basic constituents of QCD are quarks and gluons that are confined in hadronic matter: at high temperatures and/or densities quark deconfinement occurs and hadronic matter undergoes a phase transition into a new state of matter, the Quark-Gluon Plasma (QGP). Numerical solutions …
-
Heavy quark study via prompt and non-prompt strange D-meson measurements in pp and Pb¿Pb collisions with ALICE at the LHC
L'abstract è presente nell'allegato / the abstract is in the attachment
-
Heavy quarks in effective field theories
Heavy quark physics serves as a probe to understand QCD, measure standard model parameters, and look for signs of new physics. We study several aspects of heavy quark systems in an effective field theory framework, including both phenomenological and formal applications. Phenomenological …
-
A Relativistic Model for Heavy Mesons
<p>Motivated by the present interest in the heavy quark effective theory, we construct a model for heavy mesons based on a relativistic bound state wave equation, the Gross equation. The kernel we use is based on scalar confining and vector Coulomb potentials. Wave functions are treated to leading …
-
Study of a short distance top mass with a cross-section at NNLL + NNLO
We consider top-quarks produced at large energy in e+e- collisions and address the question of what top-mass can be measured from reconstruction. The production process is characterized by the center-of-mass energy, Q, the top mass, m, the top decay width, It, and also AQCD. These scales are well …
-
Paarproduktion schwerer Quarks in e+ e- -Kollisionen: QCD-Strahlungskorrekturen für die Quark-Antiquark-Beiträge zur Ordnung alpha s 2
… The decay amplitude of a virtual Z-boson into a heavy quark anti-quark pair is decomposed into four dimensionless form factors which are extracted from the decay amplitude with appropriate projectors. The resulting 1- and 2-loop integrals are reduced to linear combinations of known master …
-
The application of automated perturbation theory to lattice QCD
Predictions of heavy quark parameters are an integral component of precision tests of the Standard Model of particle physics. Experimental measurements of electroweak processes involving heavy hadrons provide stringent tests of Cabibbo-Kobayashi-Maskawa (CKM) matrix unitarity and serve as a probe …
-
Exploration of the role of diquarks in hadrons using lattice QCD
… published meson masses. We then study the light quark distribution in a meson with one heavy quark. After improving our methods in the meson case, we conclude by looking at the correlation between the two light quarks in a baryon. We find evidence for these quarks binding into spatially extended …
-
The Static Quark Potential at Finite Temperature and Density
… of the potential energy between an infinitely heavy quark-antiquark pair at high temperatures and densities. The calculations are carried out via lattice QCD in conjunction with a recently developed Bayesian inference method. We provide a detailed overview lattice QCD, Bayesian infer- ence …
-
Effective Field Theory for Doubly Heavy Baryons and Lattice QCD
… we study effective field theories for doubly heavy baryons and lattice QCD. We construct a chiral Lagrangian for doubly heavy baryons and heavy mesons that is invariant under heavy quark-diquark symmetry at leading order and includes the leading O(1/m_Q ) symmetry violating operators. The …
-
Determination of the Neutral B Meson and Neutral B(s) Meson Mixing Matrix Elements in 2+1 Lattice QCD
… of B0 -- B¯0 mixing using the Asqtad (light-quark) and Fermilab (heavy-quark) actions. The calculation is performed on the 2+1 MILC ensembles at three different lattice spacings, and uses staggered chiral perturbation theory to perform the extrapolations to the physical light quark masses as …
-
Testing the Standard Model with Top-Quark Production
Now that the existence of the top quark is firmly established, attention turns to measuring its properties. Because of its large mass, the top quark may be sensitive to physics beyond the standard model. A promising candidate for this new physics is supersymmetry. Hence, we calculate the …
Page 1 of 3