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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 42 for “"Isospin"”.
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Isospin Violating Hadronic Mass Splittings using Lattice QCD+QED
… component of the mass splittings within an isospin multiplet, such as the baryons. Our ndings provide new insight into these splittings by separating the contributions arising from strong and electromagnetic e ects. We use lattice QCD+QED to determine the avour-neutral pseudoscalar meson …
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Isospin dependence of the Ar+Ni fusion-evaporation cross section
… goal of this thesis is the determination of the isospin dependence of the Ar+Ni fusion-evaporation cross section. Three Ar isotope beams, with energies of about 13AMeV, have been accelerated and impinged onto isotopically enriched Ni targets, in order to produce Pd nuclei, with mass number …
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Group theory predictions for B --> M₁M₂M₃
… B mesons decaying to MMM, in the limit of SU(2) isospin and in the limit of SU(3) quark flavor symmetry. Our results are classified according to the relative angular momentum of mesons in the final states. When all the mesons have relative even angular momentum, there are 56 decay channels …
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NUCLEAR COLLECTIVE MODES AT FINITE TEMPERATURE AS A PROBE OF NUCLEAR STRUCTURE AND DYNAMICS
… potential energy of the system. The hindrance of isospin-forbidden GDR gamma decay from a self-conjugate CN is due to a partial restoration of isospin symmetry at high nuclear temperature, since the excited compound-nucleus lifetime is too short for the relatively weak Coulomb interaction to mix …
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The interactions of hadrons containing a heavy quark in the strong coupling limit of lattice QCD
… system, we consider all allowed spin and isospin configurations for the light quarks. The interaction potentials we find take the form of one-meson-exchange potentials, whose sign and magnitude depends on the light quarks' spin and isospin.
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Measurements of Gamow-Teller strength in medium mass nuclei using (p,n) reactions at intermediate energies
… and Gamow-Teller (GT) operators, change just the isospin projection, and the isospin and spin projections of a nucleon respectively. Beta decay studies enable the extraction of the transition matrix elements to high precision. However, most GT transition rates deduced from beta decay measurements …
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Fragmentation and nucleon structure in semi-inclusive deep-inelastic scattering at the HERMES experiment
… breaking. This evidence weakens somewhat when isospin invariance of the fragmentation functions is assumed to be broken. Additionally, the multiplicities for the semi-inclusive production of π0 mesons in deep-inelastic scattering are presented as a function of z. These multiplicities were …
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Vector boson production with the ALICE detector
… mechanism of these vector bosons is highly isospin dependent and thus they are affected by the initial state effects. Initial state effects include isospin, Fermi motion, EMC effect, shadowing and nuclear absorption. Hence their production in lead-lead (Pb-Pb) and proton-lead (p-Pb) …
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Observation of Ω Contribution in the c1(3872) → Π+π−j/ψ Decays
… of the $\X$ state as an exotic hadron, since its isospin violating $\rhoz\jpsi$ decay rate, relative to isospin conserving $\omega\jpsi$ decay, is an order of magnitude larger than expected for an ordinary charmonium state.</p>
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An Equation of State with the Complete SU(3)f Baryon Octet for Neutron Star Mergers
… We develop a new EoS, DID (for “density- and isospin-dependent”), that includes the complete SU(3)f ground-state baryon octet as well as a novel isospin-density dependence. It correctly predicts the HALQCD hyperon potentials and is consistent with neutron star observables, including the …
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The scattering of spinning hadrons from lattice QCD
… lattice calculation of $\rho \pi$ scattering in isospin-2. Here, $\rho\pi$ features in dynamically-coupled $^3{S}_1$ and $^3{D}_1$ partial-waves with $J^P=1^+$. No resonance enhancement is anticipated in the flavour exotic isospin-2 channel and as such it provides an ideal testing ground for this …
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B [right arrow] ([rho]/[omega]) [gamma] at BaBar
… the measurements of the branching fractions and isospin violations of the radiative electroweak penguin decays B [right arrow] ([rho]/[omega]) [gamma] at the asymmetric energy e+e- PEP-II collider with the BABAR detector. Together with the previously measured branching fractions of the decays ... …
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Scattering and mesons
… its basic properties and use it to analyze the isospin 0 and 2 s-wave [pi] [pi] scattering. We construct the S-matrix from our analysis and discuss the physical relevance of its poles. Further details of P for more general cases are provided in the appendices.
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Quantum transport in graphene heterostructures
… levels, leading to a variety of quantum Hall isospin ferromagnetic (QHIFM) states, which we study using tilted field magnetotransport. At yet higher fields, we observe fractional quantum Hall states which show signatures of the unique symmetries and anisotropies of the graphene QHIFM. The …
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Quantum Monte Carlo Calucations Of Three And Six-Quark States
… It is strongly dependent on the spin and isospin of the quarks. We solve for single baryon S and P-wave spectra by solving the Schrodinger equation variationally for the ground state of three interacting light-flavored valence quarks. The variational Monte Carlo method is then used to find …
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Search for pentaquark partners [Theta]⁺⁺, [Sigma]⁰ and N⁰ in H (e,e'K [pi])) X reactions at Jefferson Lab Hall A
… channels. In addition, if the 8+ has non-zero isospin then a hypothetical isospin partner, O++, might be expected in the H(e,e'K-)X channel; this was also investigated. The experiment was performed in Hall A at Jefferson Lab using a 5 GeV electron beam incident on a liquid hydrogen target. The …
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A variational theory of nuclear matter
… nucleon-nucleon potentials have strong spin, isospin, tensor and spin-orbit components which induce correspondingly strong correlations in nuclear matter. In this thesis we present a variational theory designed to cope with these complicated correlations. To place the theory in perspective we …
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Green's function Monte Carlo calculations of few-nucleon systems
… with the goal of accurately reproducing isospin symmetry breaking effects in the nuclear interaction. We briefly discuss the motivation for this potential, called Argonne $v\sb{18},$ as well as the Urbana models of three-nucleon interactions. Our approach for modeling the ground states of …
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Spin parity studies of the eta pi decay of the A2 meson and investigation of the A2 production mechanism in the reaction pi-minus proton goes to A2-minus proton
… dominated by a t channel exchange mechanism the isospin and J parity of the exchange are investigated. The sand t cross section dependence of the data are compared with a simple Regge model.
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Probing the Nonperturbative Physics of QCD with Normalizing Flows and a moderate number of Pions
… to map out the entire zero temperature, nonzero isospin density region of the QCD phase diagram. The calculation uses novel methods for working with many-pion systems that enables working with thousands of pions, and furthermore provides rigorous constraints on the baryon-dense region of the QCD …
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