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Now showing items 21-40 of 44

  • Heavy quark physics from lattice QCD 

    RYAN, SINEAD MARIE (Elsevier, 2002)
    I review the current status of lattice calculations of heavy quark quantities. Particular emphasis is placed on leptonic and semileptonic decay matrix elements.
  • Improving Algorithms to Compute All Elements of the Lattice Quark Propagator 

    PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE; SKULLERUD, JONIVAR (Elsevier, 2005)
    We present a new exact algorithm for estimating all elements of the quark propagator. The advantage of the method is that the exact all-to-all propagator is reproduced in a large but finite number of inversions. The ...
  • Lattice determinations of the strange quark mass 

    RYAN, SINEAD MARIE (University of Chicago, 1999)
    The importance of the strange quark mass, as a fundamental parameter of the Standard Model (SM) and as an input to many interesting quantities, has been highlighted in many reviews, eg in Ref . A first principles calculation ...
  • Lattice QCD calculation of anti-B --> D lepton anti-neutrino decay form-factors at zero recoil 

    RYAN, SINEAD MARIE (2008-10-09)
    A lattice QCD calculation of the B? ?Dl?? decay form factors is presented. We obtain the value of the form factor h+(w) at the zero-recoil limit w=1 with high precision by considering a ratio of correlation functions in ...
  • Matrix models, quantum gravity and the spectral dimension 

    PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE (Proceedings of Science, 2005)
    Monte Carlo studies on non-perturbative 2D Euclidean Quantum Gravity can be done with the use of the Dynamical Triangulations method. The Monte Carlo moves defined within the dynamical triangulation method can be encompassed ...
  • Melting of P wave bottomonium states in the quark-gluon plasma from lattice NRQCD 

    RYAN, SINEAD MARIE (2013)
    We study the fate of P wave bottomonium states in the quark-gluon plasma, using a spectral function analysis of euclidean lattice cor relators. The correlators are obtained from lattice QCD simulations with two ...
  • Non-perturbative study of QCD on a 2 + 2 anisotropic lattice 

    PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE (Elsevier, 2004)
    We present preliminary results for the non-perturbative determination of the parameters in a 2+2 anisotropic action. The parameters are required to restore Lorentz invariance in long-distance correlators, using the ...
  • Nonperturbative study of the action parameters for anisotropic-lattice quarks 

    PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE (2006)
    A quark action designed for highly anisotropic-lattice simulations is discussed. The mass-dependence of the parameters in the action is studied and the results are presented. Applications of this action in studies of ...
  • A perturbative determination of the parameters of an anisotropic quark action 

    PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE (Elsevier, 2005)
    The parameters of a 3+1 anisotropic quark action with Symanzik-improved glue are determined at 1-loop in perturbation theory.
  • Practical all-to-all propagators for lattice QCD 

    PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE; SKULLERUD, JONIVAR (Elsevier, 2005)
    A new method for computing all elements of the lattice quark propagator is proposed. The method combines the spectral decomposition of the propagator, computing the lowest eigenmodes exactly, with noisy estimators which ...
  • Progress in leptonic and semileptonic decays in lattice QCD 

    RYAN, SINEAD MARIE (American Physical Society, 1999)
    The status of lattice calculations of heavy quark phenomenology is reviewed. Particular emphasis is placed on the understanding and control of the calculational uncertainties. The ensuing implications for constraining ...
  • QCD on 2 + 2 anisotropic lattices 

    PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE (Elsevier, 2003)
    We discuss the implementation of QCD on 2 + 2 anisotropic lattices. Technical details regarding the choice of the action as well as perturbative and non-perturbative improvement are analyzed. The physical applications ...
  • Quenched QCD with O(a) improvement: The spectrum of light hadrons 

    RYAN, SINEAD MARIE (American Physical Society, 2000)
    We present a comprehensive study of the masses of pseudoscalar and vector mesons, as well as octet and decuplet baryons computed in O(a)-improved quenched lattice QCD. Results have been obtained using the nonperturbative ...
  • Radial and orbital excitations of static-light mesons 

    RYAN, SINEAD MARIE (American Physical Society, 2007)
    We present results for the spectrum of static-light mesons from Nf = 2 lattice QCD. These results were obtained using all-to-all light quark propagators on an anisotropic lattice, yielding an improved signal resolution ...
  • S wave bottomonium states moving in a quark-gluon plasma from lattice NRQCD 

    RYAN, SINEAD MARIE (2013)
    We extend our study of bottomonium spectral functions in the quark-gluon plasma to nonzero momentum. We use lattice QCD simulations with two flavours of light quark on highly anisotropic lattices and treat the bottom quark ...
  • Semileptonic decays B-->pi lepton neutrino and D-->pi lepton neutrion from lattice QCD 

    RYAN, SINEAD MARIE (American Physical Society, 2001)
    We present a lattice QCD calculation of the form factors and differential decay rates for semileptonic decays of the heavy-light mesons B and D to the final state pln . The results are obtained with three methodological ...
  • Soft covariant gauges on the lattice 

    RYAN, SINEAD MARIE (2008-10-08)
    We present an exploratory study of a one-parameter family of covariant, nonperturbative lattice gauge-fixing conditions that can be implemented through a simple Monte Carlo algorithm. We demonstrate that at the numerical ...
  • Spectroscopy of Bs and Ds mesons 

    RYAN, SINEAD MARIE (Elsevier, 1998)
    We study Bs and Ds spectroscopy in quenched lattice QCD using the Fermilab approach to heavy quarks. We obtain results at four lattice spacings, a, using O(a)-improved Wilson quarks. We compare and contrast the various ...
  • The spectrum of charmed mesons from dynamical anisotropic lattices 

    PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE (2007)
    We present our preliminary analysis for the chamonium and Ds spectra obtained from Nf = 2 dynamical anisotropic lattices. We use 123?80 lattices with lattice spacing at = 7.35 GeV?1 and anisotropy of six. Meson correlators ...