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Showing 1 to 20 of 36 for “"Pseudoscalar"”.
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Weak decays of beautiful pseudoscalar mesons with Lattice Quantum Chromodynamics
Weak decays of beautiful mesons can be used to probe the validity of our best model of particle physics: the Standard Model. In this thesis, I use specialised techniques to overcome practical challenges associated with the large mass of valence $b$ quarks to study a selection of decays of $B$ …
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Measurement of the Rate of Muon Capture in Hydrogen Gas and Determination of the Proton's Pseudoscalar Coupling
The MuCap experiment, the data analysis leading to the result for Lambda S, and contextual information are described in this dissertation. In the first chapter, a brief historical review of previous measurements of muon capture on the proton introduces many of the experimental challenges. The next …
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The Relativistic Schroedinger Equation and Its Application to Pseudoscalar Meson-Baryon Scattering in a Broken Su(3) Symmetry Model
Made available in DSpace on 2015-05-12T21:41:45Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6808131.PDF: 5861811 bytes, checksum: 39c3c6e8dd97a64c10221fb8db32ea15 (MD5) Previous issue date: 1967
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The relativistic Schrödinger equation and its application to pseudoscalar meson baryon scattering in a broken SU(3) symmetry model
The problem of pseudosca1ar meson baryon scattering is discussed within the framework of the relativistic Schrodinger equation and in the four lowest partia1 waves. The driving force (potential) is obtained by ca1culating the allowed single particle exchange processes for which thee~oharged …
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Application of the relativistic Schrödinger equation to the bootstrap problem
… graphs for single particle exchanges. At first, pseudoscalar-pseudoscalarmeson scattering is considered in a multichannel calculation. The vector mesons obtained are recombined with the pseudoscalars, and multichannel vector-pseudoscalar scattering is studied. The pseudoscalars themselves are …
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Search for new phenomena using three-photon final states in data collected with the ATLAS detector at the Large Hadron Collider
… a vector boson, $Z^\prime$, can decay to a pseudoscalar, $a$, and a photon, $\gamma$. The pseudoscalar can then decay into two photons: $Z^\prime \rightarrow a \gamma \rightarrow \gamma \gamma \, \gamma$. In addition, the Standard Model (SM) $Z$ boson can rarely decay into three photons via …
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Measurements of Charm Meson Production in 10.5 GeV Electron -Positron Annihilations
… distributions of D+s and D*+s , the vector to pseudoscalar production ratio for Ds, and the D*+ spin alignment. A description of the new trigger designed for the CLEO III detector is also provided.
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Radiative muon capture on nuclear targets
… world average value, but yields a value for the pseudoscalar coupling constant, gp, which is lower than the Goldberger-Treiman PCAC prediction. In the absence of a theoretical model to predict the R11C rates for Al and 5i, only the branching ratios for these targets are reported. For Mo, 5n, and …
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Isospin Violating Hadronic Mass Splittings using Lattice QCD+QED
… light ground state hadron spectrum, including pseudoscalar mesons, octet baryons and decuplet baryons. We replicate this same analysis for ground state charmed hadrons. In these studies the QED component is necessary for two reasons. Firstly, it is necessary when attempting to obtain mass …
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Experimental constraints on exotic spin-dependent interactions using specialized materials
… to spin 1/2 fermions through scalar (gs) and pseudoscalar (gp) couplings. We discuss two experiments that can investigate these interactions using nucleon rich, impressively low magnetic susceptibility (5-100 times lower than pure water) test masses and electron-spin rich, polarized test …
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The Staggered Chiral Perturbation Theory In The Two-Flavor Case And Su(2) Chiral Analysis Of The Milc Data
… the staggered fermion formalism. In the light pseudoscalar sector, I study rSχPT in the two-flavor case. The pion mass and decay constant are calculated through NLO for a partially-quenched theory. In the limit where the strange quark mass is large compared to the light quark masses and the …
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Field Theoretic Models of Deep Inelastic Lepton-Nucleon Scattering
… in g in the neutral vector meson theory and pseudoscalar meson theory. Ladder diagrams with nucleon loops contribute to the leading logarithm in the neutral vector meson theory but do not contribute to the leading logarithm in the pseudoscalar meson theory. 4. The leading part of the …
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Off-shell pion electromagnetic form factors in chiral perturbation theory
… contributions to Green functions in the pseudoscalar meson sector. We find that in addition to the phenomenological constant 'L₉' associated with the pion charge radius, another phenomenological constant enters the electromagnetic form factor ƒπ⁺. This constant scales a contribution that …
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Measurements of B(Ds -> lvl) and fDs using data collected from the BaBar experiment
… fractions B(Ds -> lvl) and measurements of the pseudoscalar decay constant, fDs , using all the data acquired at the BaBar detector at SLAC National Accelerator Laboratory, which were collected from September 1999 to April 2007, and comprised 531 fb-1. The following mea- surements are made: B(Ds …
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Inclusive hadron production in electron-positron collisions with center-of-mass energies from 50 to 61.4 GeV
… of production of vector mesons to vector plus pseudoscalar mesons and the ratio of the production of excited ss̄ quark pairs to the production of excited uū plus dd̄ quark pairs are compared with other experiments along with the phenomenological predictions. The HERWIG Monte Carlo is tuned with …
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Light Quark Masses from QCD Finite Energy Sum Rules
… from a QCD finite energy sum rule, using the pseudoscalar correlator to six-loop order in perturbative QCD, with the leading vacuum condensates and higher order quark mass corrections included. The systematic uncertainties stemming from the hadronic resonance sector are reduced, by introducing …
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Measurement of Pion-Pion Final State Interactions in η → π +π −γ with CLAS at Jefferson Lab
<p>Decays of pseudoscalar mesons proceed from the chiral anomaly, which arises from spontaneous chiral symmetry breaking. In the limit of massless quarks (chiral limit), the η → π +π −γ the decay width is determined solely by the box anomaly term in the Wess Zumino Witten Lagrangian. Since the …
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Meson Photo-Couplings From Lattice Quantum Chromodynamics
… matrix elements for the lightest few isovector pseudoscalar and vector particles. The dependence of these form factors and transitions on the photon virtuality is extracted and some model intuitions are explored.</p>
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Observation of structure in the phi phi system produced in radiative J/psi decays
… that the enhancement is predominantly pseudoscalar. This effect is similar to what is observed in other radiative decays to two vector mesons and a photon. An upper limit is placed on the production of tensor glueball candidates observed to decay to ¢¢ by another experiment.
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