Browsing by Author "RYAN, SINEAD MARIE"
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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 antiB > D lepton antineutrino decay formfactors at zero recoil
RYAN, SINEAD MARIE (20081009)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 zerorecoil 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 nonperturbative 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 ... 
Nonperturbative study of QCD on a 2 + 2 anisotropic lattice
PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE (Elsevier, 2004)We present preliminary results for the nonperturbative determination of the parameters in a 2+2 anisotropic action. The parameters are required to restore Lorentz invariance in longdistance correlators, using the ... 
Nonperturbative study of the action parameters for anisotropiclattice quarks
PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE (2006)A quark action designed for highly anisotropiclattice simulations is discussed. The massdependence 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 Symanzikimproved glue are determined at 1loop in perturbation theory. 
Practical alltoall 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 nonperturbative 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 staticlight mesons
RYAN, SINEAD MARIE (American Physical Society, 2007)We present results for the spectrum of staticlight mesons from Nf = 2 lattice QCD. These results were obtained using alltoall light quark propagators on an anisotropic lattice, yielding an improved signal resolution ... 
S wave bottomonium states moving in a quarkgluon plasma from lattice NRQCD
RYAN, SINEAD MARIE (2013)We extend our study of bottomonium spectral functions in the quarkgluon 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 heavylight 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 (20081008)We present an exploratory study of a oneparameter family of covariant, nonperturbative lattice gaugefixing 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 ... 
Staticlight hadrons on a dynamical anisotropic lattice
PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE; SKULLERUD, JONIVAR (Proceedings of Science, 2005)We present preliminary results for the staticlight meson and baryon spectra for Nf = 2 QCD. The study is performed on an anisotropic lattice and uses a new alltoall propagator method allowing us to determine particle ... 
Staticlight matrix elements on a dynamical antisotropic lattice
PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE; SKULLERUD, JONIVAR (Elsevier, 2005)The staticlight matrix element needed to determine fB is studied on an anisotropic lattice with Nf = 2. The improvement in precision due to stout links and alltoall propagators is investigated. 
Tuning anisotropies for dynamical gauge configurations
PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE (SISSA, 2005)We present methods and results for the tuning of quark and gluon anisotropies for improved actions in Nf = 2 QCD.